Tootfinder

Shiva and Shakti - Presumed Proto-Galactic Fragments in the Inner Milky Way: #Gaia unravels the ancient threads of the #MilkyWay: #galaxy, discovering two surprising streams of stars that formed and wove together over 12 billion years ago.

The Gaia white dwarf revolution
Pier-Emmanuel Tremblay, Antoine B\'edard, Mairi W. O'Brien, James Munday, Abbigail K. Elms, Nicola Pietro Gentillo Fusillo, Snehalata Sahu
https://arxiv.org/abs/2402.14960

The Gaia white dwarf revolution
This review highlights the role of the \textit{Gaia} space mission in transforming white dwarf research. These stellar remnants constitute 5-7\% of the local stellar population in volume, yet before \textit{Gaia} the lack of trigonometric parallaxes hindered their identification. The mission's Data Release 2 in 2018 provided the first unbiased colour-absolute magnitude diagram of the local stellar population, identifying 260\,000 white dwarfs, with the number later increasing to over 355\,000 i…

Host star properties of hot, warm and cold Jupiters in the solar neighborhood from \textit{Gaia} DR3: clues to formation pathways
Bihan Banerjee (Tata Institute of Fundamental Research, Mumbai, India), Mayank Narang (Academia Sinical Institute of Astronomy and Astrophysics, Taiwan, Tata Institute of Fundamental Research, Mumbai, India), P. Manoj (Tata Institute of Fundamental Research, Mumbai, India), Thomas Henning (Max-Planck-Institut f\"ur Astronomie), Himanshu Tyagi (Tata Inst…

Host star properties of hot, warm and cold Jupiters in the solar neighborhood from \textit{Gaia} DR3: clues to formation pathways
Giant planets exhibit diverse orbital properties, hinting at their distinct formation and dynamic histories. In this paper, using $\textit{Gaia}$ DR3, we investigate if and how the orbital properties of Jupiters are linked to their host star properties, particularly their metallicity and age. We obtain metallicities for main sequence stars of spectral type F, G, and K, hosting hot, warm, and cold Jupiters with varying eccentricities. We compute the velocity dispersion of host stars of these thr…

Tracing the Galactic disk from the kinematics of Gaia Cepheids
Xiaoyue ZhouNational Astronomical Observatories of Chinese Academy of Sciences, Xiaodian ChenNational Astronomical Observatories of Chinese Academy of Sciences, Licai DengNational Astronomical Observatories of Chinese Academy of Sciences, Shu WangNational Astronomical Observatories of Chinese Academy of Sciences

Tracing the Galactic disk from the kinematics of Gaia Cepheids
Classical Cepheids (CCs) are excellent tracers for understanding the structure of the Milky Way disk. The latest Gaia Data Release 3 provides a large number of line-of-sight velocity information for Galactic CCs, offering an opportunity for studying the kinematics of the Milky Way. We determine the three-dimensional velocities of 2057 CCs relative to the Galactic center. From the projections of the 3D velocities onto the XY plane of the Galactic disk, we find that $V_{R}$ and $V_ϕ$ velocities …

Probing Stellar Clusters from Gaia DR2 as Galactic PeVatrons: I -- Expected Gamma-ray and Neutrino Emission
Alison M. W. Mitchell, Giovanni Morlino, Silvia Celli, Stefano Menchiari, Andreas Specovius
https://arxiv.org/abs/2403.16650

Probing Stellar Clusters from Gaia DR2 as Galactic PeVatrons: I -- Expected Gamma-ray and Neutrino Emission
Young & massive stellar clusters (SCs) are a potential source of galactic cosmic rays up to very high energies as a result of two possible acceleration scenarios. Collective stellar winds from massive member stars form a wind-blown bubble with a termination shock (TS) at which particle acceleration to PeV energies may occur. Furthermore, shock acceleration may occur at SNRs expanding inside the bubble. By applying a model of CR acceleration at both the wind TS and SNR shocks to catalogues of kn…

Correlations between Ca II H&K Emission and the Gaia M dwarf Gap
Emily M. Boudreaux, Aylin Garcia Soto, Brian C. Chaboyer
https://arxiv.org/abs/2402.14984

Correlations between Ca II H&K Emission and the Gaia M dwarf Gap
The Gaia M dwarf gap, also known as the Jao Gap, is a novel feature discovered in the Gaia DR2 G vs. BP-RP color magnitude diagram. This gap represents a 17 percent decrease in stellar density in a thin magnitude band around the convective transition mass ($\sim 0.35 M_{\odot}$) on the main sequence. Previous work has demonstrated a paucity of Hydrogen Alpha emission coincident with the G magnitude of the Jao Gap in the solar neighborhood. The exact mechanism which results in this paucity is as…

"Radcliffe Welle": Große Gasstruktur hinter der Sonne schaukelt wie eine La-Ola
Erst dank der Daten des Weltraumteleskops Gaia wurde vor vier Jahren ein gigantisches Gasband vergleichsweise nahe der Sonne entdeckt. Nun gibt es Neuigkeiten.

This https://arxiv.org/abs/2403.04141 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

VLBI Astrometry of Radio Stars to Link Radio and Optical Celestial Reference Frames: Observing Strategies
The Gaia celestial reference frame (Gaia-CRF) will benefit from a close assessment with independent methods, such as Very Long Baseline Interferometry (VLBI) measurements of radio stars at bright magnitudes. However, obtaining full astrometric parameters for each radio star through VLBI measurements demands a significant amount of observation time. This study proposes an efficient observing strategy that acquires double-epoch VLBI positions to measure the positions and proper motions of radio s…

This https://arxiv.org/abs/2402.14960 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

The Gaia white dwarf revolution
This review highlights the role of the \textit{Gaia} space mission in transforming white dwarf research. These stellar remnants constitute 5-7\% of the local stellar population in volume, yet before \textit{Gaia} the lack of trigonometric parallaxes hindered their identification. The mission's Data Release 2 in 2018 provided the first unbiased colour-absolute magnitude diagram of the local stellar population, identifying 260\,000 white dwarfs, with the number later increasing to over 355\,000 i…

This https://arxiv.org/abs/2403.12219 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

High-precision astrometry with VVV -- II. A near-infrared extension of Gaia into the Galactic plane
Aims. We use near-infrared, ground-based data from the VISTA Variables in the Via Lactea (VVV) survey to indirectly extend the astrometry provided by the Gaia catalog to objects in heavily-extincted regions towards the Galactic bulge and plane that are beyond Gaia's reach. Methods. We make use of the state-of-the-art techniques developed for high-precision astrometry and photometry with the Hubble Space Telescope to process the VVV data. We employ empirical, spatially-variable, effective point-…

I tried to pull this trick with black holes (like Gaia BH2) or neutron stars.
I don't know where to find a dataset for the approaches of neutron stars and black holes for the closest approach dates of each.
#AskAstronomy

Seit Ende Februar beschäftige ich mich mit dem #GaiaPrinzip, das Leben, Arbeiten und Wirtschaften im Einklang mit natürlichen Zyklen gestaltet.
Von Anfang Februar bis Frühlingsbeginn ist die Zeit im Jahr, in der sich zarte Impulse des Neuen zeigen. Frische Visionen entstehen aus dem inneren Feuer der Begeisterung.
Heute ist

#4 Wachstumsbeginn — Das Gaia-Prinzip – Natürlich erfolgreich.

This https://arxiv.org/abs/2401.09531 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

High mass function ellipsoidal variables in the Gaia Focused Product Release: searching for black hole candidates in the binary zoo
The recent Gaia Focused Product Release contains radial velocity time-series for more than 9,000 Gaia long-period photometric variables. Here we search for binary systems with large radial velocity amplitudes to identify candidates with massive, unseen companions. Eight targets have binary mass function $f(M)>1\ M_\odot$, three of which are eclipsing binaries. The remaining five show evidence of ellipsoidal modulations. We fit spectroscopic orbit models to the Gaia radial velocities, and fit th…

Discovery of a dormant 33 solar-mass black hole in pre-release Gaia astrometry: #BlackHole in our galaxy found: https://www.cosmos.esa.int/web/gaia/iow_20240416 and https://www.eso.org/public/news/eso2408/ and https://www.youtube.com/watch?v=cU00B-6DeSQ&ab_channel=ESAGaiaMission

This https://arxiv.org/abs/2402.07750 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

A Statistical and Multiwavelength Photometric Analysis of a Young Embedded Open Star Cluster: IC 1590
We present a statistical and multiwavelength photometric studies of young open cluster IC 1590. We identified 91 cluster members using $Gaia$ DR3 astrometry data using ensemble-based unsupervised machine learning techniques. From $Gaia$ EDR3 data, we estimate the best-fitted parameters for IC 1590 using the Automated Stellar Cluster Analysis package (ASteCA) yielding the distance $d$ $\sim$ 2.87 $\pm$ 0.02 Kpc, age $\sim$ 3.54 $\pm$ 0.05 Myr, metallicity $z$ $\sim$ 0.0212 $\pm$ 0.003, binarity …

Binary origin of blue straggler stars in Galactic star clusters
M. J. RainESO Chile, M. S. PeraLa Plata, G. PerrenRosario, O. BenvenutoLa Plata, J. PaneiLa Plata, A. de VitoLa Plata, G. CarraroPadova, S. VillanovaConcepcion
https://arxiv.org/abs/2402.14990

Binary origin of blue straggler stars in Galactic star clusters
Building on the recent release of a new \emph{Gaia}-based blue straggler star catalog in Galactic open star clusters (OCs), we explored the properties of these stars in a cluster sample spanning a wide range in fundamental parameters. We employed \emph{Gaia} EDR3 to assess the membership of any individual blue or yellow straggler to their parent cluster. We then made use of the \texttt{ASteCA} code to estimate the fundamental parameters of the selected clusters, in particular, the binary fracti…

Gaia - Der Müllplanet

Nice video about the #Gaia discovery of the 33 solar-mass #BlackHole, making use of the #GaiaSky space simulation software: https://www.youtube.com/watch?v=cU00B-6DeSQ

The enigmatic origin of two dormant BH binaries: Gaia BH1 and Gaia BH2
Iwona Kotko, Sambaran Banerjee, Krzysztof Belczynski
https://arxiv.org/abs/2403.13579

The enigmatic origin of two dormant BH binaries: Gaia BH1 and Gaia BH2
The two systems that have been confirmed as dormant (no X-ray emission detected) black hole (BH) - low-mass star binaries (Gaia BH1 and Gaia BH2) in the latest Gaia mission data release (DR3) are very intriguing in the context of their evolution. Both systems consist of $\sim 9 \mathrm{M_{\odot}}$ BH and $\sim 1 \mathrm{M_{\odot}}$ star orbiting each other on a wide, eccentric orbit ($e\sim 0.5$). We argue that the formation of Gaia BH-like systems through the isolated binary evolution (IBE) ch…

Modeling Circumstellar Gas Emission around a White Dwarf Using Cloudy
Siyi Xu, Sherry Yeh, Laura. K. Rogers, Amy Steele, Erik Dennihy, Alexandra E. Doyle, P. Dufour, Beth L. Klein, Christopher J. Manser, Carl Melis, Tinggui Wang, Alycia J. Weinberger
https://arxiv.org/abs/2403.15794

Modeling Circumstellar Gas Emission around a White Dwarf Using Cloudy
The chemical composition of an extrasolar planet is fundamental to its formation, evolution and habitability. In this study, we explore a new way to measure the chemical composition of the building blocks of extrasolar planets, by measuring the gas composition of the disrupted planetesimals around white dwarf stars. As a first attempt, we used the photo-ionization code Cloudy to model the circumstellar gas emission around a white dwarf Gaia J0611$-$6931 under some simplified assumptions. We fou…

Dynamical formation of Gaia BH3 in the progenitor globular cluster of the ED-2 stream
Daniel Mar\'in Pina, Sara Rastello, Mark Gieles, Kyle Kremer, Laura Fitzgerald, Bruno Rando
https://arxiv.org/abs/2404.13036

Dynamical formation of Gaia BH3 in the progenitor globular cluster of the ED-2 stream
Context. The star-black hole (S-BH) binary discovered by the Gaia Collaboration - Gaia BH3 - is chemically and kinematically associated with the metal-poor ED-2 stream in the Milky Way halo. Aims. We explore the possibility that Gaia BH3 was assembled dynamically in the progenitor globular cluster (GC) of the ED-2 stream. Methods. We use a public suite of star-by-star dynamical Monte Carlo models by Kremer et al. (2020) to identify S-BH binaries in GCs with different initial masses and (hal…

🔊 #NowPlaying on BBCRadio3's #Radio3InConcert
Elizabeth Maconchy & GAIA:
🎵 Duo (Theme And Variations)
#ElizabethMaconchy #GAIA

A 500 pc volume-limited sample of hot subluminous stars I. Space density, scale height, and population properties
H. Dawson, S. Geier, U. Heber, I. Pelisoli, M. Dorsch, V. Schaffenroth, N. Reindl, R. Culpan, M. Pritzkuleit, J. Vos, A. A. Soemitro, M. M. Roth, D. Schneider, M. Uzundag, M. Vu\v{c}kovi\'c, L. Antunes Amaral, A. G. Istrate, S. Justham, R. H. {\O}stensen, J. H. Telting, A. A. Djupvik, R. Raddi, E. M. Green, C. S. Jeffery, S. O. Kepler, J. Munday, T. Steinmetz, T. Kupfer…

A 500 pc volume-limited sample of hot subluminous stars I. Space density, scale height, and population properties
We present the first volume-limited sample of spectroscopically confirmed hot subluminous stars out to 500 pc, defined using the accurate parallax measurements from the {\em Gaia} space mission data release 3 (DR3). The sample comprises a total of 397 members, with 305 ($\sim 77\%$) identified as hot subdwarf stars, including 83 newly discovered systems. Of these, we observe that 178 ($\sim58\%$) are hydrogen-rich sdBs, 65 are sdOBs ($\sim 21\%$), 32 are sdOs ($\sim 11\%$), and 30 are He-sdO/Bs…

Assessing Human Judgment Forecasts in the Rapid Spread of the Mpox Outbreak: Insights and Challenges for Pandemic Preparedness
Thomas McAndrew, Maimuna S. Majumder, Andrew A. Lover, Srini Venkatramanan, Paolo Bocchini, Tamay Besiroglu, Allison Codi, Gaia Dempsey, Sam Abbott, Sylvain Chevalier, Nikos I. Bosse, Juan Cambeiro, David Braun
https://

Assessing Human Judgment Forecasts in the Rapid Spread of the Mpox Outbreak: Insights and Challenges for Pandemic Preparedness
In May 2022, mpox (formerly monkeypox) spread to non-endemic countries rapidly. Human judgment is a forecasting approach that has been sparsely evaluated during the beginning of an outbreak. We collected -- between May 19, 2022 and July 31, 2022 -- 1275 forecasts from 442 individuals of six questions about the mpox outbreak where ground truth data are now available. Individual human judgment forecasts and an equally weighted ensemble were evaluated, as well as compared to a random walk, autoreg…

Radial halo substructure in harmony with the Galactic bar
Adam M. Dillamore, Vasily Belokurov, N. Wyn Evans
https://arxiv.org/abs/2402.14907 https://

Radial halo substructure in harmony with the Galactic bar
Overdensities in the radial phase space $(r,v_r)$ of the Milky Way's halo have previously been associated with the phase-mixed debris of a highly radial merger event, such as Gaia Sausage-Enceladus. We present and test an alternative theory in which the overdense 'chevrons' are instead composed of stars trapped in resonances with the Galactic bar. We develop an analytic model of resonant orbits in the isochrone potential, and complement this with a test particle simulation of a stellar halo in …

Quantum Automating $\mathbf{TC}^0$-Frege Is LWE-Hard
Noel Arteche, Gaia Carenini, Matthew Gray
https://arxiv.org/abs/2402.10351 https://

Quantum Automating $\mathbf{TC}^0$-Frege Is LWE-Hard
We prove the first hardness results against efficient proof search by quantum algorithms. We show that under Learning with Errors (LWE), the standard lattice-based cryptographic assumption, no quantum algorithm can weakly automate $\mathbf{TC}^0$-Frege. This extends the line of results of Krajíček and Pudlák (Information and Computation, 1998), Bonet, Pitassi, and Ray (FOCS, 1997), and Bonet et al. (Computational Complexity, 2004), who showed that Extended Frege, $\mathbf{TC}^0$-Frege and $\…

Quaia, the #Gaia-unWISE Quasar Catalog: An All-sky Spectroscopic Quasar Sample: https://iopscience.iop.org/article/10.3847/1538-4357/ad1328 -> Gaia maps largest ever collection of quasars in space and time: https://www.esa.int/ESA_Multimedia/Images/2024/03/Gaia_maps_largest_ever_collection_of_quasars_in_space_and_time

Runaway OB Stars in the Small Magellanic Cloud III. Updated Kinematics and Insights on Dynamical vs. Supernova Ejections
Grant D. Phillips, M. S. Oey, Maria Cuevas, Norberto Castro, Rishi Kothari
https://arxiv.org/abs/2403.17198

Runaway OB Stars in the Small Magellanic Cloud III. Updated Kinematics and Insights on Dynamical vs. Supernova Ejections
We use the kinematics of field OB stars to estimate the frequencies of runaway stars generated by the dynamical ejection scenario (DES), the binary supernova scenario (BSS), and the combined two-step mechanism. We update the proper motions for field OB and OBe stars in the Small Magellanic Cloud (SMC) using Gaia DR3. Our sample now contains 336 stars from the Runaways and Isolated O-Type Star Spectroscopic Survey of the SMC (RIOTS4), and we update our algorithm to calculate more accurate veloci…

KOMITET WYBORCZY WYBORCœW GAIA SYSTEM - MŁODZI DLA PRZYSZŁOŚCI TERAZ
Kandydat na prezydenta Katowic chce, żeby miastem zarządzał superkomputer
#katowice

Kandydat na prezydenta Katowic chce, żeby miastem zarządzał superkomputer
Marek Strzałkowski to jeden z pięciu kandydatów na urząd prezydenta Katowic. Chce, żeby miastem zarządzał superkomputer. Od kandydatów na radnych wymaga tylko, żeby byli uczciwi, bo „całą resztą zajmą się systemy informatyczne”.

Combining Gaia and GRAVITY: Characterising Five New Directly Detected Substellar Companions
T. O. Winterhalder, S. Lacour, A. M\'erand, A. -L. Maire, J. Kammerer, T. Stolker, N. Pourr\'e, C. Babusiaux, R. Abuter, A. Amorim, R. Asensio-Torres, W. O. Balmer, M. Benisty, J. -P. Berger, H. Beust, S. Blunt, A. Boccaletti, M. Bonnefoy, H. Bonnet, M. S. Bordoni, G. Bourdarot, W. Brandner, F. Cantalloube, P. Caselli, B. Charnay, G. Chauvin, A. Chavez, E. Choquet, V. Christiaens, Y. Cl\…

Combining Gaia and GRAVITY: Characterising Five New Directly Detected Substellar Companions
Precise mass constraints are vital for the characterisation of brown dwarfs and exoplanets. Here, we present how the combination of data obtained by Gaia and GRAVITY can help enlarge the sample of substellar companions with measured dynamical masses. We show how the Non-Single-Star (NSS) two-body orbit catalogue contained in Gaia DR3 can be used to inform high angular resolution follow-up observations with GRAVITY. Applying the method presented in this work for eight Gaia candidate systems, we …

This https://arxiv.org/abs/2308.01295 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

A parsec-scale Galactic 3D dust map out to 1.25 kpc from the Sun
High-resolution 3D maps of interstellar dust are critical for probing the underlying physics shaping the structure of the interstellar medium, and for foreground correction of astrophysical observations affected by dust. We aim to construct a new 3D map of the spatial distribution of interstellar dust extinction out to a distance of 1.25 kpc from the Sun. We leveraged distance and extinction estimates to 54 million nearby stars derived from the Gaia BP/RP spectra. Using the stellar distance and…

The Distance to the S147 Supernova Remnant
C. S. Kochanek (Department of Astronomy, The Ohio State University), J. C. Raymond (Harvard-Smithsonian Center for Astrophysics), N. Caldwell (Harvard-Smithsonian Center for Astrophysics)
https://arxiv.org/abs/2403.13892

The Distance to the S147 Supernova Remnant
In the absence of a parallax distance to a pulsar or a surviving binary in a supernova remnant (SNR), distances to Galactic SNRs are generally very uncertain. However, by combining Gaia data with wide field, multi-fiber echelle spectroscopy, it is now possible to obtain accurate distances to many SNRs with limited extinction by searching for the appearance of high velocity CaII or NaI absorption lines in hot stars as a function of distance. We demonstrate this for the SNR S147 using the spectra…

Updated kinematics of the Radcliffe Wave: non-synchronous, dipole-like vertical oscillations
Zhi-Kai Zhu, Min Fang, Zu-Jia Lu, Junzhi Wang, Guang-Xing Li, Shiyu Zhang, Veli-Matti Pelkonen, Paolo Padoan, En-Wei Liang
https://arxiv.org/abs/2402.15346

Updated kinematics of the Radcliffe Wave: non-synchronous, dipole-like vertical oscillations
The kinematic structure of the Radcliffe Wave (RW) is crucial for understanding its origin and evolution. In this work, we present an accurate measurement of the vertical velocity $V_Z$ by where the radial velocity (RV) measures are taken into consideration. This is achieved in two ways. First, the velocities are measured towards Young Stellar Objects (YSOs), using their RV and proper motion measurements from APOGEE-2 and Gaia DR3. Second, we combine RV measurements toward clouds with proper mo…

Gaia DR3 detectability of unresolved binary systems
Alfred Castro-Ginard, Zephyr Penoyre, Andrew R. Casey, Anthony G. A. Brown, Vasily Belokurov, Tristan Cantat-Gaudin, Ronald Drimmel, Morgan Fouesneau, Shourya Khanna, Evgeny P. Kurbatov, Adrian M. Price-Whelan, Hans-Walter Rix, Richard L. Smart
https://arxiv.org/abs/2404.14127<…

Gaia DR3 detectability of unresolved binary systems
Gaia can not individually resolve very close binary systems, however, the collected data can still be used to identify them. A powerful indicator of stellar multiplicity is the sources reported Renormalized Unit Weight Error (ruwe), which effectively captures the astrometric deviations from single-source solutions. We aim to characterise the imprints left on ruwe caused by binarity. By flagging potential binary systems based on ruwe, we aim to characterise which of their properties will contrib…

Radial Wave in the Galactic Disk: New Clues to Discriminate Different Perturbations
Chengye Cao, Zhao-Yu Li, Ralph Sch\"onrich, Teresa Antoja
https://arxiv.org/abs/2403.14953

Radial Wave in the Galactic Disk: New Clues to Discriminate Different Perturbations
Decoding the key dynamical processes that shape the Galactic disk structure is crucial for reconstructing the Milky Way's evolution history. The second Gaia data release unveils a novel wave pattern in the $L_Z-\langle V_R\rangle$ space, but its formation mechanism remains elusive due to the intricate nature of involved perturbations and the challenges in disentangling their effects. Utilizing the latest Gaia DR3 data, we find that the $L_Z-\langle V_R\rangle$ wave systematically shifts towards…

Discovery of the magnetic cataclysmic variable XMM J152737.4-205305.9 with a deep eclipse-like feature
Samet Ok, Axel Schwope, David A. H. Buckley, Jaco Brink
https://arxiv.org/abs/2403.14278

Discovery of the magnetic cataclysmic variable XMM J152737.4-205305.9 with a deep eclipse-like feature
In this study, we report a discovery from XMM-Newton, which involves the identification and subsequent examination of a newly discovered polar-type cataclysmic variable named XMM J152737.4-205305.9. The discovery was made by matching the XMM-Newton data archive with the cataclysmic variable candidate catalog provided by Gaia Data Release 3. The utilization of X-ray photometry has led to the identification of two distinct dips that exhibit a recurring pattern with a precise period of 112.4(1) mi…

Photometric Re-calibration of VPHAS $u$-band Photometry with the Stellar Colour Regression Method and Gaia DR3
Bing-Qiu Chen, Hai-Bo Yuan, Bo-Wen Huang
https://arxiv.org/abs/2404.13817

Photometric Re-calibration of VPHAS+ $u$-band Photometry with the Stellar Colour Regression Method and Gaia DR3
The u band magnitude is vital for determining stellar parameters and investigating specific astronomical objects. However, flux calibration in the u band for stars in the Galactic disk presents significant challenges. In this study, we introduce a comprehensive re-calibration of $u$-band photometric magnitudes of the VPHAS+ Data Release 4 (DR4), employing the Stellar Colour Regression (SCR) technique. By leveraging the expansive set of XP spectra and $G_{\rm BP}$ photometry from Gaia Data Relea…

Machine learning-based identification of Gaia astrometric exoplanet orbits
Johannes Sahlmann, Pablo G\'omez
https://arxiv.org/abs/2404.09350 https://…

Machine learning-based identification of Gaia astrometric exoplanet orbits
The third Gaia data release (DR3) contains $\sim$170 000 astrometric orbit solutions of two-body systems located within $\sim$500 pc of the Sun. Determining component masses in these systems, in particular of stars hosting exoplanets, usually hinges on incorporating complementary observations in addition to the astrometry, e.g. spectroscopy and radial velocities. Several DR3 two-body systems with exoplanet, brown-dwarf, stellar, and black-hole components have been confirmed in this way. We deve…

Formation of a $33\,M_{\odot}$ black hole in a low-metallicity binary
Kareem El-Badry
https://arxiv.org/abs/2404.13047 https://arxiv.…

Formation of a $33\,M_{\odot}$ black hole in a low-metallicity binary
A $33\,M_\odot$ black hole (BH) was recently discovered in an 11.6-year binary only 590 pc from the Sun. The system, Gaia BH3, contains a $0.8\,M_\odot$ low-metallicity giant ($\rm [M/H]=-2.2$) and is kinematically part of the Galactic halo, suggesting that the BH formed from a low-metallicity massive star. I show that orbits similar to that of Gaia BH3 are naturally produced through isolated binary evolution. The system's period and eccentricity can result from a broad range of initial orbits …

Galactic Archaeology with Gaia
Alis J. DeasonDurham, Vasily BelokurovCambridge
https://arxiv.org/abs/2402.12443 https://arxiv.org/pdf…

Galactic Archaeology with Gaia
The Gaia mission has revolutionized our view of the Milky Way and its satellite citizens. The field of Galactic Archaeology has been piecing together the formation and evolution of the Galaxy for decades, and we have made great strides, with often limited data, towards discovering and characterizing the subcomponents of the Galaxy and its building blocks. Now, the exquisite 6D phase-space plus chemical information from Gaia and its complementary spectroscopic surveys has handed us a plethora of…

Gaia23ckh: Symbiotic outburst of the assumed Mira variable V390 Sco
Jaroslav Merc, Peter Velez, St\'ephane Charbonnel, Olivier Garde, Pascal Le D\^u, Lionel Mulato, Thomas Petit, Jan Skowron
https://arxiv.org/abs/2403.14313

Gaia23ckh: Symbiotic outburst of the assumed Mira variable V390 Sco
The poorly studied variable star V390 Sco, previously classified as a Mira pulsator, was detected in a brightening event by the ESA Gaia satellite in September 2023. This work presents an analysis of available archival multifrequency photometric data of this target, along with our spectroscopic observations. Our findings lead to the conclusion that V390 Sco is a new symbiotic star identified by Gaia, currently undergoing a classical symbiotic outburst. Additionally, we uncovered three prior out…

The 33 M$_\odot$ black hole Gaia BH3 is part of the disrupted ED-2 star cluster
E. Balbinot, E. Dodd, T. Matsuno, C. Lardo, A. Helmi, P. Panuzzo, T. Mazeh, B. Holl, E. Caffau, A. Jorissen, C. Babusiaux, P. Gavras, L. Wyrzykowski, L. Eyer, N. Leclerc, A. Bombrun, N. Mowlavi, G. M. Seabroke, D. Teyssier, I. Cabrera-Ziri, T. M. Callingham, T. Ruiz-Lara, E. Starkenburg

The 33 M$_\odot$ black hole Gaia BH3 is part of the disrupted ED-2 star cluster
The Gaia Collaboration has recently reported the detection of a 33 M$_\odot$ black hole in a wide binary system located in the Solar neighbourhood. Here we explore the relationship between this black hole, known as Gaia BH3, and the nearby ED-2 halo stellar stream. We study the orbital characteristics of the Gaia BH3 binary and present measurements of the chemical abundances of ED-2 member stars derived from high-resolution spectra obtained with the VLT. We find that the Galactic orbit of the G…

Estimating the Absolute Parameters of W UMa-type Binary Stars Using Gaia DR3 Parallax
Atila Poro, Mahya Hedayatjoo, Maryam Nastaran, Mahshid Nourmohammad, Hossein Azarara, Sepideh AlipourSoudmand, Fatemeh AzarinBarzandig, Razieh Aliakbari, Sadegh Nasirian, Nazanin Kahali Poor
https://arxiv.org/abs/2403.09801

Estimating the Absolute Parameters of W UMa-type Binary Stars Using Gaia DR3 Parallax
The accuracy of absolute parameters' estimation in contact binary systems is important for investigating their evolution and solving some challenges. The Gaia DR3 parallax is one of the methods used for estimating the absolute parameters, in cases where photometric data is the only one that is available. The use of this method includes advantages and limitations that we have described and examined in this study. We selected 48 contact binary systems whose mass ratios were mostly obtained by spe…

The Escape Velocity Profile of the Milky Way from Gaia DR3: #MilkyWay by Calculating How Hard it is to Escape: https://www.universetoday.com/165598/astronomers-measure-the-mass-of-the-milky-way-by-calculating-how-hard-it-is-to-escape/

Asteroid reflectance spectra from Gaia DR3: Near-UV in primitive asteroids
F. Tinaut-Ruano, J. de Le\'on, E. Tatsumi, D. Morate, M. Mahlke, P. Tanga, J. Licandro
https://arxiv.org/abs/2403.10321

Asteroid reflectance spectra from Gaia DR3: Near-UV in primitive asteroids
In the context of charge-coupled devices (CCDs), the ultraviolet (UV) region has mostly remained unexplored after the 1990s. Gaia DR3 offers the community a unique opportunity to explore tens of thousands of asteroids in the near-UV as a proxy of the UV absorption. This absorption has been proposed in previous works as a diagnostic of hydration, organics, and space weathering. Aims. In this work, we aim to explore the potential of the NUV as a diagnostic region for primitive asteroids using Gai…

zoomies: A tool to infer stellar age from vertical action in Gaia data
Sheila Sagear (Lucy), Adrian M. Price-Whelan (Lucy), Sarah Ballard (Lucy), Yuxi (Lucy), Lu, Ruth Angus, David W. Hogg
https://arxiv.org/abs/2403.09878

zoomies: A tool to infer stellar age from vertical action in Gaia data
Stellar age measurements are fundamental to understanding a wide range of astronomical processes, including galactic dynamics, stellar evolution, and planetary system formation. However, extracting age information from Main Sequence stars is complicated, with techniques often relying on age proxies in the absence of direct measurements. The Gaia data releases have enabled detailed studies of the dynamical properties of stars within the Milky Way, offering new opportunities to understand the rel…

High-precision astrometry with VVV -- II. A near-infrared extension of Gaia into the Galactic plane
M. Griggio (INAF - Osservatorio Astronomico di Padova, Italy, University of Ferrara, Italy, Space Telescope Science Institute, USA), M. Libralato (INAF - Osservatorio Astronomico di Padova, Italy, AURA for the European Space Agency, Space Telescope Science Institute, USA), A. Bellini (Space Telescope Science Institute, USA), L. R. Bedin (INAF - Osservatorio Astronomico di Padova, Italy),…

High-precision astrometry with VVV -- II. A near-infrared extension of Gaia into the Galactic plane
Aims. We use near-infrared, ground-based data from the VISTA Variables in the Via Lactea (VVV) survey to indirectly extend the astrometry provided by the Gaia catalog to objects in heavily-extincted regions towards the Galactic bulge and plane that are beyond Gaia's reach. Methods. We make use of the state-of-the-art techniques developed for high-precision astrometry and photometry with the Hubble Space Telescope to process the VVV data. We employ empirical, spatially-variable, effective point-…

Gaia's binary star renaissance
Kareem El-Badry
https://arxiv.org/abs/2403.12146 https://arxiv.org/pdf/2403.12146

Gaia's binary star renaissance
Stellar multiplicity is among the oldest and richest problems in astrophysics. Binary stars are a cornerstone of stellar mass and radius measurements that underpin modern stellar evolutionary models. Binaries are the progenitors of many of the most interesting and exotic astrophysical phenomena, ranging from type Ia supernovae to gamma ray bursts, hypervelocity stars, and most detectable stellar black holes. They are also ubiquitous, accounting for about half of all stars in the Universe. In th…

Hypervelocity star candidates from Gaia DR2 and DR3 proper motions and parallaxes
Ralf-Dieter Scholz
https://arxiv.org/abs/2402.10714 https://

Hypervelocity star candidates from Gaia DR2 and DR3 proper motions and parallaxes
Hypervelocity stars (HVSs) unbound to the Galaxy can be formed with extreme stellar interactions. Observational evidence comes from measurements of radial velocities (RVs) of objects crossing the Galactic halo and of tangential velocities based on high proper motions (HPMs) and distances of relatively nearby stars. I searched for new HVS candidates and reviewed known objects using their Gaia astrometric measurements. Candidates were selected with significant Gaia parallaxes of >0.1mas, proper m…

Hypervelocity star candidates from Gaia DR2 and DR3 proper motions and parallaxes
Ralf-Dieter Scholz
https://arxiv.org/abs/2402.10714 https://

Hypervelocity star candidates from Gaia DR2 and DR3 proper motions and parallaxes
Hypervelocity stars (HVSs) unbound to the Galaxy can be formed with extreme stellar interactions. Observational evidence comes from measurements of radial velocities (RVs) of objects crossing the Galactic halo and of tangential velocities based on high proper motions (HPMs) and distances of relatively nearby stars. I searched for new HVS candidates and reviewed known objects using their Gaia astrometric measurements. Candidates were selected with significant Gaia parallaxes of >0.1mas, proper m…

Compact Binary Formation in Open Star Clusters II: Difficulty of Gaia NS formation in low-mass star clusters
Ataru Tanikawa, Long Wang, Michiko S. Fujii
https://arxiv.org/abs/2404.01731

Compact Binary Formation in Open Star Clusters II: Difficulty of Gaia NS formation in low-mass star clusters
Gaia mission offers opportunities to search for compact binaries not involved in binary interactions (hereafter inert compact binaries), and results in the discoveries of binaries containing one black hole (BH) or one neutron star (NS), called ``Gaia BHs'' and ``Gaia NSs'', respectively. We have assessed if Gaia BHs and NSs can be formed in open clusters through dynamical interactions. In order to obtain a large number of inert compact binaries similar to Gaia BHs and NSs, we have performed gra…

The Gaia-ESO Survey: The DR5 analysis of the medium-resolution GIRAFFE and high-resolution UVES spectra of FGK-type stars
C. C. Worley, R. Smiljanic, L. Magrini, A. Frasca, E. Franciosini, D. Montes, D. K. Feuillet, H. M. Tabernero, J. I. Gonz\'alez Hern\'andez, S. Villanova, \v{S}. Mikolaitis, K. Lind, G. Tautvai\v{s}ien\.e, A. R. Casey, A. J. Korn, P. Bonifacio, C. Soubiran, E. Caffau, G. Guiglion, T. Merle, A. Hourihane, A. Gonneau, P. Fran\c{c}ois, S. Randich, G. Gilmore, J…

The Gaia-ESO Survey: The DR5 analysis of the medium-resolution GIRAFFE and high-resolution UVES spectra of FGK-type stars
The Gaia-ESO Survey is an European Southern Observatory (ESO) public spectroscopic survey that targeted $10^5$ stars in the Milky Way covering the major populations of the disk, bulge and halo. The observations were made using FLAMES on the VLT obtaining both UVES high ($R\sim47,000$) and GIRAFFE medium ($R\sim20,000$) resolution spectra. The analysis of the Gaia-ESO spectra was the work of multiple analysis teams (nodes) within five working groups (WG). The homogenisation of the stellar para…

Discovery of a dormant 33 solar-mass black hole in pre-release Gaia astrometry
Gaia Collaboration, et al.
https://arxiv.org/abs/2404.10486 https://<…

Discovery of a dormant 33 solar-mass black hole in pre-release Gaia astrometry
Gravitational waves from black-hole merging events have revealed a population of extra-galactic BHs residing in short-period binaries with masses that are higher than expected based on most stellar evolution models - and also higher than known stellar-origin black holes in our Galaxy. It has been proposed that those high-mass BHs are the remnants of massive metal-poor stars. Gaia astrometry is expected to uncover many Galactic wide-binary systems containing dormant BHs, which may not have been …

This https://arxiv.org/abs/2309.15143 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Triage of the Gaia DR3 astrometric orbits. II. A census of white dwarfs
The third data release of Gaia was the first to include orbital solutions assuming non-single stars. Here, we apply the astrometric triage technique of Shahaf et al. to identify binary star systems with companions that are not single main-sequence stars. Gaia's synthetic photometry of these binaries is used to distinguish between systems likely to have white-dwarf companions and those that may be hierarchical triples. The study uncovered a population of nearly 3200 binaries, characterised by or…

This https://arxiv.org/abs/2404.10486 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Discovery of a dormant 33 solar-mass black hole in pre-release Gaia astrometry
Gravitational waves from black-hole merging events have revealed a population of extra-galactic BHs residing in short-period binaries with masses that are higher than expected based on most stellar evolution models - and also higher than known stellar-origin black holes in our Galaxy. It has been proposed that those high-mass BHs are the remnants of massive metal-poor stars. Gaia astrometry is expected to uncover many Galactic wide-binary systems containing dormant BHs, which may not have been …

Detecting New Visual Binaries in Gaia DR3 with Gaia and Two Micron All Sky Survey (2MASS) Photometry II. Speckle Observations of 16 Low-Separation Systems
Ilija Medan (Georgia State University, Vanderbilt University), S\'ebastien L\'epine (Georgia State University), Zachary Hartman (Gemini Observatory/NSF's NOIRLab), Keivan G. Stassun (Vanderbilt University)

Detecting New Visual Binaries in Gaia DR3 with Gaia and Two Micron All Sky Survey (2MASS) Photometry II. Speckle Observations of 16 Low-Separation Systems
Here we present speckle observations of 16 low-separation ($s<30$ AU) high probability candidate binaries from the catalog by Medan et al., where secondaries typically lack astrometric solutions in Gaia. From these speckle observations, we find a second component is always detected within the field of view. To determine if the detection is consistent with a physical companion or a chance alignment with a background source, we utilize a statistic from Tokovinin & Kiyaeva that compares the appare…

This https://arxiv.org/abs/2308.15582 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Investigating Mass Segregation of the Binary Stars in the Open Cluster NGC 6819
We search for mass segregation in the intermediate-aged open cluster NGC 6819 within a carefully identified sample of probable cluster members. Using photometry from the Gaia, 2MASS, and Pan-STARRS surveys as inputs for a Bayesian statistics software suite, BASE-9, we identify a rich population of (photometric) binaries and derive posterior distributions for the cluster age, distance, metallicity and reddening as well as star-by-star photometric membership probabilities, masses and mass ratios …

Luminosity class of the symbiotic stars 4U1954 319 and ZZ CMi
R. Zamanov, K. A. Stoyanov, G. Latev, J. Marti, A. Takey, E. G. Elhosseiny, M. D. Christova, M. Minev, V. Vujcic, M. Moyseev, V. Marchev
https://arxiv.org/abs/2402.14378

Luminosity class of the symbiotic stars 4U1954+319 and ZZ CMi
We performed optical photometry and spectral observations of the symbiotic stars 4U1954+319 and ZZ CMi. For 4U1954+319 using high-resolution spectra we measure the equivalent widths of diffuse interstellar bands and estimate the interstellar reddening E(B-V)=0.83 +/- 0.09. Using GAIA distances and our photometry, we find (1) absolute V band magnitude of 4U1954+319 M_V=-5.23 +/- 0.08 and that the mass donor is a supergiant of luminosity class Ib, and (2) for ZZ CMi M_V=-0.27 +/- 0.2 and that the…

A Blueprint for the Milky Way's Stellar Populations. V. 3D Local Dust Extinction
Deokkeun An, Timothy C. Beers, Anirudh Chiti
https://arxiv.org/abs/2404.14626

A Blueprint for the Milky Way's Stellar Populations. V. 3D Local Dust Extinction
Using a grid of empirically calibrated synthetic spectra developed in our previous study, we construct an all-sky 3D extinction map from the large collection of low-resolution XP spectra in Gaia DR3. Along each line of sight, with an area ranging from $0.2$ to $13.4$ deg$^2$, we determine both the reddening and metallicity of main-sequence stars and model the foreground extinction up to approximately $3$ kpc from the Sun. Furthermore, we explore variations in the total-to-selective extinction r…

The Gaia-ESO Survey: Calibrating the lithium-age relation with open clusters and associations. II. Expanded cluster sample and final membership selection
M. L. Guti\'errez Albarr\'an, D. Montes, H. M. Tabernero, J. I. Gonz\'alez Hern\'andez, E. Marfil, A. Frasca, A. C. Lanzafame, A. Klutsch, E. Franciosini, S. Randich, R. Smiljanic, A. J. Korn, G. Gilmore, E. J. Alfaro, T. Bensby, K. Biazzo, A. Casey, G. Carraro, F. Damiani, S. Feltzing, P. Fran\c{c}ois, F. Jim\'ene…

The Gaia-ESO Survey: Calibrating the lithium-age relation with open clusters and associations. II. Expanded cluster sample and final membership selection
The Li abundance observed in pre-main sequence and main sequence late-type stars is strongly age-dependent, but also shows a complex pattern depending on several parameters, such as rotation, chromospheric activity and metallicity. The best way to calibrate these effects, with the aim of studying Li as an age indicator for FGK stars, is to calibrate coeval groups of stars, such as open clusters (OCs) and associations. We present a considerable target sample of 42 OCs and associations, ranging f…

The Rise of the $R$-Process in the Gaia-Sausage/Enceladus Dwarf Galaxy
Xiaowei Ou, Alexander P. Ji, Anna Frebel, Rohan P. Naidu, Guilherme Limberg
https://arxiv.org/abs/2404.10067

The Rise of the $R$-Process in the Gaia-Sausage/Enceladus Dwarf Galaxy
Neutron star mergers (NSMs) produce copious amounts of heavy r-process elements after a time delayed inspiral process. Once NSMs are present in a galaxy, r-process elements, such as Eu, are expected to significantly increase with time. Yet, there has been limited observational data in support of Eu increasing within Local Group galaxies. We have obtained high-resolution Magellan/MIKE observations of 43 metal-poor stars in the Gaia-Sausage/Enceladus tidally disrupted galaxy with $-2.5 < \rm{[Fe/…

The Gaia-ESO Survey: Calibrating the lithium-age relation with open clusters and associations. II. Expanded cluster sample and final membership selection
M. L. Guti\'errez Albarr\'an, D. Montes, H. M. Tabernero, J. I. Gonz\'alez Hern\'andez, E. Marfil, A. Frasca, A. C. Lanzafame, A. Klutsch, E. Franciosini, S. Randich, R. Smiljanic, A. J. Korn, G. Gilmore, E. J. Alfaro, T. Bensby, K. Biazzo, A. Casey, G. Carraro, F. Damiani, S. Feltzing, P. Fran\c{c}ois, F. Jim\'ene…

The Gaia-ESO Survey: Calibrating the lithium-age relation with open clusters and associations. II. Expanded cluster sample and final membership selection
The Li abundance observed in pre-main sequence and main sequence late-type stars is strongly age-dependent, but also shows a complex pattern depending on several parameters, such as rotation, chromospheric activity and metallicity. The best way to calibrate these effects, with the aim of studying Li as an age indicator for FGK stars, is to calibrate coeval groups of stars, such as open clusters (OCs) and associations. We present a considerable target sample of 42 OCs and associations, ranging f…

Isochrone Fitting of Galactic Globular Clusters -- VI. High-latitude Clusters NGC5024 (M53), NGC5053, NGC5272 (M3), NGC5466, and NGC7099 (M30)
G. A. Gontcharov, S. S. Savchenko, A. A. Marchuk, C. J. Bonatto, O. S. Ryutina, M. Yu. Khovritchev, V. B. Il'in, A. V. Mosenkov, D. M. Poliakov, A. A. Smirnov
https://arxiv.org/abs/24…

Isochrone Fitting of Galactic Globular Clusters -- VI. High-latitude Clusters NGC5024 (M53), NGC5053, NGC5272 (M3), NGC5466, and NGC7099 (M30)
We fit various colour-magnitude diagrams (CMDs) of the high-latitude Galactic globular clusters NGC\,5024 (M53), NGC\,5053, NGC\,5272 (M3), NGC\,5466, and NGC\,7099 (M30) by isochrones from the Dartmouth Stellar Evolution Database and Bag of Stellar Tracks and Isochrones for $α$-enrichment [$α$/Fe]$=+0.4$. For the CMDs, we use data sets from {\it Hubble Space Telescope}, {\it Gaia}, and other sources utilizing, at least, 25 photometric filters for each cluster. We obtain the following charact…

High speed stars: III. Detailed abundances and binary nature of the extreme speed star GHS143
E. Caffau, P. Bonifacio L. Monaco, L. Sbordone, M. Spite, P. Francois, P. Panuzzo, P. Sartoretti, L. Chemin, F. Thevenin, A. Mucciarelli
https://arxiv.org/abs/2404.07731

High speed stars: III. Detailed abundances and binary nature of the extreme speed star GHS143
The Gaia satellite has provided the community with three releases containing astrometrical and photometric data as well as by products, such as stellar parameters and variability indicators. By selecting in the Gaia database, one can select stars with the requested characteristics, such as high speed. At present any selection is based on available Gaia releases including a subset of the observations. This, for some stars, can show some limitations, for example there is still not a sufficient nu…

New Interstellar Extinction Maps Based on Gaia and Other Sky Surveys
G. A. Gontcharov, A. A. Marchuk, M. Yu. Khovrichev, A. V. Mosenkov, S. S. Savchenko, V. B. Il'in, D. M. Polyakov, A. A. Smirnov
https://arxiv.org/abs/2402.06474

New Interstellar Extinction Maps Based on Gaia and Other Sky Surveys
We present new three-dimensional (3D) interstellar extinction maps in the $V$ and Gaia $G$ filters within 2 kpc of the Sun, a 3D differential extinction (dust spatial distribution density) map along the lines of sight in the same space, a 3D map of variations in the ratio of the extinctions in the $V$ and Gaia $G$ filters within 800 pc of the Sun, and a 2D map of total Galactic extinction through the entire dust half-layer from the Sun to extragalactic space for Galactic latitudes $|b|…

This https://arxiv.org/abs/2402.06722 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

A $1.9\,M_{\odot}$ neutron star candidate in a 2-year orbit
We report discovery and characterization of a main-sequence G star orbiting a dark object with mass $1.90\pm 0.04 M_{\odot}$. The system was discovered via Gaia astrometry and has an orbital period of 731 days. We obtained multi-epoch RV follow-up over a period of 639 days, allowing us to refine the Gaia orbital solution and precisely constrain the masses of both components. The luminous star is a $\gtrsim 12$ Gyr-old, low-metallicity halo star near the main-sequence turnoff ($T_{\rm eff}\appro…

Probing the inner Galactic Halo with blue horizontal branch stars: Gaia DR3 based catalogue with atmospheric and stellar parameters
Richard Culpan, Matti Dorsch, Stephan Geier, Ingrid Pelisoli, Ulrich Heber, Brankica Kubatova, Mauricio Cabezas
https://arxiv.org/abs/2402.09779

Probing the inner Galactic Halo with blue horizontal branch stars: Gaia DR3 based catalogue with atmospheric and stellar parameters
Context. Stars that are found on the blue horizontal-branch (BHB) have evolved from low-mass stars that have completed their core hydrogen burning main sequence stage and have undergone the helium flash at the end of their red-giant phase. The fact that their luminosity is virtually constant at all effective temperatures also makes them good standard candles. Aims. We provide a catalogue of BHB stars with stellar parameters that have been calculated from spectral energy distributions (SED), as …

This https://arxiv.org/abs/2309.12989 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

A determination of the LMC dark matter subhalo mass using the MW halo stars in its gravitational wake
Our goal is to study the gravitational effects caused by the passage of the Large Magellanic Cloud (LMC) in its orbit on the stellar halo of the Milky Way (MW). We employed the Gaia Data Release 3 to construct a halo tracers data set consisting of K-Giant stars and RR-Lyrae variables. Additionally, we have compared the data with a theoretical model to estimate the DM subhalo mass. We have improved the characterisation of the local wake and the collective response due to the LMC orbit. On the ot…

Measuring White Dwarf Variability from Sparsely Sampled Gaia DR3 Multi-Epoch Photometry
Maya Steen (Department of Astronomy, Boston Univeristy, Department of Astronomy, New Mexico State University), J. J. Hermes (Department of Astronomy, Boston Univeristy), Joseph A. Guidry (Department of Astronomy, Boston Univeristy), Annabelle Paiva (Department of Astronomy, Boston Univeristy), Jay Farihi (Department of Physics & Astronomy, University College London), Tyler M. Heintz (Department …

Measuring White Dwarf Variability from Sparsely Sampled Gaia DR3 Multi-Epoch Photometry
White dwarf stars are ubiquitous in the Galaxy, and are essential to understanding stellar evolution. While most white dwarfs are photometrically stable and reliable flux standards, some can be highly variable, which can reveal unique details about the endpoints of low-mass stellar evolution. In this study we characterize a sample of high-confidence white dwarfs with multi-epoch photometry from Gaia Data Release 3. We compare these Gaia light curves with light curves from the Zwicky Transiting …

SED Analysis of the Old Open Cluster NGC 188
Deniz Cennet Dursun, Seval Ta\c{s}demir, Seliz Ko\c{c}, Srishti \.Iyer
https://arxiv.org/abs/2404.13115 https:…

SED Analysis of the Old Open Cluster NGC 188
In this study, we investigate the fundamental astrophysical parameters of the old open cluster NGC 188 through two complementary methods: isochron-fitting and spectral energy distribution (SED) analysis. Using photometric, astrometric, and spectroscopic data from the Gaia Data Release 3, we identify 868 most likely member stars with membership probabilities $P \geq 0.5$. The mean proper-motion components and trigonometric parallaxes of the cluster are derived as ($μ_α\cos δ$, $μ_δ$) = (-$2…

Disentangling the Galaxy's Gordian knot: evidence from $APOGEE-Gaia$ for a knotted and slower bar in the Milky Way
Danny Horta, Michael S. Petersen, Jorge Pe\~narrubia
https://arxiv.org/abs/2402.07986

Disentangling the Galaxy's Gordian knot: evidence from $APOGEE-Gaia$ for a knotted and slower bar in the Milky Way
The inner $\sim5$ kiloparsec (kpc) region of the Milky Way is complex. Unravelling the evolution of the Galaxy requires precise understanding of the formation of this region. We report a study focused on disentangling the inner Galaxy ($r < 5$ kpc) using the measured positions, velocities, and element abundance ratios of red giant stars from the $APOGEE-Gaia$ surveys. After removing the stellar halo, inner Galaxy populations can be grouped into three main components based on their angular momen…

Stellar flybies within 1 ly from the Sun and stars passing through the Hills cloud
Igor Yu. Potemine
https://arxiv.org/abs/2402.13015 https://

Stellar flybies within 1 ly from the Sun and stars passing through the Hills cloud
We reexamine the SIMBAD database with incorporated Gaia DR3 parallaxes and proper motions. Appropriate query searches allow us to find several nearby stars with measured radial velocities having flybies within 1 ly from the Sun (in linear approximation). The closest past flyby $\approx 215.7$ kyr ago at $\approx 0.136$ pc is attributed to the star UCAC4 323-037188, currently located at 21.74 pc from the Sun. If the radial velocity of a star is unknown, we attribute to it an ``advantageous'' val…

This https://arxiv.org/abs/2306.17749 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Quaia, the Gaia-unWISE Quasar Catalog: An All-Sky Spectroscopic Quasar Sample
We present a new, all-sky quasar catalog, Quaia, that samples the largest comoving volume of any existing spectroscopic quasar sample. The catalog draws on the 6,649,162 quasar candidates identified by the Gaia mission that have redshift estimates from the space observatory's low-resolution BP/RP spectra. This initial sample is highly homogeneous and complete, but has low purity, and 18% of even the bright ($G<20.0$) confirmed quasars have discrepant redshift estimates ($|Δz/(1+z)|>0…

Stellar flybies within 1 ly from the Sun and stars passing through the Hills cloud
Igor Yu. Potemine
https://arxiv.org/abs/2402.13015 https://

Stellar flybies within 1 ly from the Sun and stars passing through the Hills cloud
We reexamine the SIMBAD database with incorporated Gaia DR3 parallaxes and proper motions. Appropriate query searches allow us to find several nearby stars with measured radial velocities having flybies within 1 ly from the Sun (in linear approximation). The closest past flyby $\approx 215.7$ kyr ago at $\approx 0.136$ pc is attributed to the star UCAC4 323-037188, currently located at 21.74 pc from the Sun. If the radial velocity of a star is unknown, we attribute to it an ``advantageous'' val…

New catalog of distances to planetary nebulae based on Gaia parallaxes and statistical distances
Diego Hern\'andez-Ju\'arez, M\'onica Rodr\'iguez, Miriam Pe\~na
https://arxiv.org/abs/2403.04606

New catalog of distances to planetary nebulae based on Gaia parallaxes and statistical distances
We have developed a method to determine the most reliable distances for a large group of planetary nebulae. For this purpose, we analyze the distances obtained from \textit{Gaia} parallaxes and three determinations of statistical distances. The most reliable distance is derived for 2211 objects, and uncertainties for these distances are calculated in a homogeneous way. Using our most reliable distances, we compare the distributions of Galactic heights of hydrogen-poor and hydrogen-rich central …

Radial and azimuthal gradients of the moving groups in Gaia DR3: The slow/fast bar degeneracy problem
Marcel Bernet, Pau Ramos, Teresa Antoja, Giacomo Monari, Benoit Famaey
https://arxiv.org/abs/2403.02393 https://arxiv.org/pdf/2403.02393
arXiv:2403.02393v1 Announce Type: new
Abstract: The structure and dynamics of the central bar of the Milky Way are still under debate whilst being fundamental ingredients for the evolution of our Galaxy. The recent Gaia DR3 offers an unprecedented detailed view of the 6D phase-space of the MW. We aim to characterise the dynamical moving groups across the MW disc, and use their large-scale distribution to help constrain the properties of the Galactic bar. We used wavelet transforms of the azimuthal velocity ($V_\phi$) distribution in bins of radial velocity to robustly detect the kinematic substructure in the Gaia DR3 catalogue. We then connected these structures across the disc to measure the azimuthal ($\phi$) and radial ($R$) gradients of the moving groups. We simulated thousands of perturbed distribution functions using Backwards Integration of feasible Galaxy models that include a bar, to compare them with the data and to explore and quantify the degeneracies. The radial gradient of the Hercules moving group ($\partial V_\phi/\partial R$ = 28.1$\pm$2.8 km$\,$s$^{-1}\,$kpc$^{-1}$) cannot be reproduced by our simple models of the Galaxy which show much larger slopes both for a fast and a slow bar. This suggests the need for more complex dynamics (e.g. spiral arms, a slowing bar, external perturbations, etc.). We measure an azimuthal gradient for Hercules of $\partial V_\phi/\partial \phi$ = -0.63$\pm$0.13$\,$km$\,$s$^{-1}$deg$^{-1}$ and find that it is compatible with both the slow and fast bar models. Our analysis points out that using this type of analysis at least two moving groups are needed to start breaking the degeneracies. We conclude that it is not sufficient for a model to replicate the local velocity distribution; it must also capture its larger-scale variations. The accurate quantification of the gradients, especially in the azimuthal direction, will be key for the understanding of the dynamics governing the disc. (ABR)

The Hertzsprung progression of Classical Cepheids in the Gaia era
Marcella Marconi, Giulia De Somma, Roberto Molinaro, Anupam Bhardwaj, Vincenzo Ripepi, Ilaria Musella, Teresa Sicignano, Erasmo trentin, silvio Leccia
https://arxiv.org/abs/2403.05699

The Hertzsprung progression of Classical Cepheids in the Gaia era
A new fine grid of nonlinear convective pulsation models for the so-called "bump Cepheids" is presented to investigate the Hertzprung progression (HP) phenomenon shown by their light and radial pulsation velocity curves. The period corresponding to the center of the HP is investigated as a function of various model assumptions, such as the efficiency of super-adiabatic convection, the mass-luminosity relation, and the metal and helium abundances. The assumed mass-luminosity relation is found to…

Searching for globular clusters in the inner halo of the Circinus galaxy
C. O. Obasi, M. Gomez, D. Minniti, L. D. Baravalle, M. V. Alonso, B. I. Okere
https://arxiv.org/abs/2403.03177 https://arxiv.org/pdf/2403.03177
arXiv:2403.03177v1 Announce Type: new
Abstract: In this study, we search for Globular Clusters (GCs) in the inner halo of the Circinus galaxy using a combination of observational data. Our dataset includes observations from the VISTA Variables in the V\'ia L\'actea Extended Survey (VVVX), optical data from Gaia Release 3 (DR3), and observations from the Dark Energy Camera (DECam). These multiple data sources provide a comprehensive basis for our analysis. Our search was concentrated within a 50 kpc radius from the centre, leading to the identification of 93 sources that met our established criteria. To ensure the reliability of our findings, we conducted multiple examinations for sample contamination. These examinations incorporated tests based on Gaia Astrometric Excess Noise (AEN), the Blue Photometer (BP)/Red Photometer (RP) Excess Factor (BRexcess), as well as comparisons with stellar population models.
This analysis confidently classified 41 sources as genuine GCs, as they successfully passed both the 3$\sigma$ Gaia AEN and BRexcess tests. We used the ISHAPE program to determine the structural parameters (half-light radii) of the GC candidates, with a peak effective radius of 4$\pm$ 0.5 pc. The catalogue mainly consists of bright GCs. Relationships between colour, size, and distance were found in the GC candidates, alongside confirmation of bi-modality in colour distributions.

The Hertzsprung progression of Classical Cepheids in the Gaia era
Marcella Marconi, Giulia De Somma, Roberto Molinaro, Anupam Bhardwaj, Vincenzo Ripepi, Ilaria Musella, Teresa Sicignano, Erasmo trentin, silvio Leccia
https://arxiv.org/abs/2403.05699

The Hertzsprung progression of Classical Cepheids in the Gaia era
A new fine grid of nonlinear convective pulsation models for the so-called "bump Cepheids" is presented to investigate the Hertzprung progression (HP) phenomenon shown by their light and radial pulsation velocity curves. The period corresponding to the center of the HP is investigated as a function of various model assumptions, such as the efficiency of super-adiabatic convection, the mass-luminosity relation, and the metal and helium abundances. The assumed mass-luminosity relation is found to…

A $1.9\,M_{\odot}$ neutron star candidate in a 2-year orbit
Kareem El-Badry, Joshua D. Simon, Henrique Reggiani, Hans-Walter Rix, David W. Latham, Allyson Bieryla, Lars A. Buchhave, Sahar Shahaf, Tsevi Mazeh, Sukanya Chakrabarti, Puragra Guhathakurta, Ilya V. Ilyin
https://arxiv.org/abs/2402.06722<…

A $1.9\,M_{\odot}$ neutron star candidate in a 2-year orbit
We report discovery and characterization of a main-sequence G star orbiting a dark object with mass $1.90\pm 0.04\,M_{\odot}$. The system was discovered via Gaia astrometry and has an orbital period of 731 days. We obtained multi-epoch RV follow-up over a period of 600 days, allowing us to refine the Gaia orbital solution and precisely constrain the masses of both components. The luminous star is a $\gtrsim 12$ Gyr-old, low-metallicity halo star near the main-sequence turnoff ($T_{\rm eff} \app…

A survey for variable young stars with small telescopes: VIII -- Properties of 1687 Gaia selected members in 21 nearby clusters
Dirk Froebrich, Aleks Scholz, Justyn Campbell-White, Siegfried Vanaverbeke, Carys Herbert, Jochen Eislöffel, Thomas Urtly, Timothy P. Long, Ivan L. Walton, Klaas Wiersema, Nick J. Quinn, Tony Rodda, Juan-Luis Gonzšlez-Carballo, Mario Morales Aimar, Rafael Castillo García, Francisco C. Soldšn Alfaro, Faustino García de la Cuesta, Domenico Licchelli, Alex Escart…

A survey for variable young stars with small telescopes: VIII -- Properties of 1687 Gaia selected members in 21 nearby clusters
The Hunting Outbursting Young Stars (HOYS) project performs long-term, optical, multi-filter, high cadence monitoring of 25 nearby young clusters and star forming regions. Utilising Gaia DR3 data we have identified about 17000 potential young stellar members in 45 coherent astrometric groups in these fields. Twenty one of them are clear young groups or clusters of stars within one kiloparsec and they contain 9143 Gaia selected potential members. The cluster distances, proper motions and members…

This https://arxiv.org/abs/2310.18101 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Radial velocities from Gaia BP/RP spectra
The Gaia mission has provided us full astrometric solutions for over 1.5B sources. However, only the brightest 34M of those have radial velocity measurements. As a proof of concept, this paper aims to close that gap, by obtaining radial velocity estimates from the low-resolution BP/RP spectra that Gaia now provides. These spectra are currently published for about 220M sources, with this number increasing to the full $\sim 2$B Gaia sources with Gaia Data Release 4. To obtain the radial velocity …

Searching for Hyper-compact star clusters in the Milky Way using LAMOST and Gaia
Hao Wu, Haibo Yuan, Yilun Wang, Zexi Niu, Huawei Zhang
https://arxiv.org/abs/2404.08234

Searching for Hyper-compact star clusters in the Milky Way using LAMOST and Gaia
During the early merger of the Milky Way, intermediate-mass black holes in merged dwarf galaxies may have been ejected from the center of their host galaxies due to gravitational waves, carrying some central stars along. This process can lead to the formation of hyper-compact star clusters, potentially hosting black holes in the mass range of $10^4$ to $10^5$ solar masses. These clusters are crucial targets for identifying and investigating intermediate-mass black holes. However, no hyper-compa…

Discovery of a hot post-AGB star in Galactic globular cluster E3
R. Kumar, A. Moharana, S. Piridi, A. C. Pradhan, K. G. He{\l}miniak, N. Ikonnikova, A. Dodin, R. Szczerba, M. Giersz, D. K. Ojha, M. R. Samal
https://arxiv.org/abs/2403.12907

Discovery of a hot post-AGB star in Galactic globular cluster E3
We report a new hot-PAGB star identified in the Galactic GC E3, which is one of the first to show a binary signature among the identified PAGB stars of GCs. We present a detailed photometric and spectroscopic analysis to study the evolutionary status of the newly identified hot-PAGB star. We use Gaia EDR3 proper motion (PM) and parallax measurements to confirm the cluster membership. We supplement the photometric observations with radial velocities (RVs) from multi-epoch high resolution (R$\sim…

Searching for Hyper-compact star clusters in the Milky Way using LAMOST and Gaia
Hao Wu, Haibo Yuan, Yilun Wang, Zexi Niu, Huawei Zhang
https://arxiv.org/abs/2404.08234

Searching for Hyper-compact star clusters in the Milky Way using LAMOST and Gaia
During the early merger of the Milky Way, intermediate-mass black holes in merged dwarf galaxies may have been ejected from the center of their host galaxies due to gravitational waves, carrying some central stars along. This process can lead to the formation of hyper-compact star clusters, potentially hosting black holes in the mass range of $10^4$ to $10^5$ solar masses. These clusters are crucial targets for identifying and investigating intermediate-mass black holes. However, no hyper-compa…

Rotation at the Fully Convective Boundary: Insights from Wide WD MS Binary Systems
Federica Chiti, Jennifer L. van Saders, Tyler M. Heintz, J. J. Hermes, J. M. Joel Ong, Daniel R. Hey, Michele M. Ramirez-Weinhouse, Alison Dugas
https://arxiv.org/abs/2403.12129

Rotation at the Fully Convective Boundary: Insights from Wide WD + MS Binary Systems
Gyrochronology, a valuable tool for determining ages of low-mass stars where other techniques fail, relies on accurate calibration. We present a sample of 327 wide ($>$$100$\,au) white dwarf + main sequence (WD + MS) binary systems. Total ages of WDs are computed using all-sky survey photometry, Gaia parallaxes, and current hydrogen atmosphere WD models. Using a magnetic braking law calibrated against open clusters, along with assumptions about initial conditions and angular momentum transport,…

Milky Way-est: Cosmological Zoom-in Simulations with Large Magellanic Cloud and Gaia-Sausage-Enceladus Analogs
Deveshi Buch, Ethan O. Nadler, Risa H. Wechsler, Yao-Yuan Mao
https://arxiv.org/abs/2404.08043

Milky Way-est: Cosmological Zoom-in Simulations with Large Magellanic Cloud and Gaia-Sausage-Enceladus Analogs
We present Milky Way-est, a suite of 20 cosmological cold-dark-matter-only zoom-in simulations of Milky Way (MW)-like host halos. Milky Way-est hosts are selected such that they: ($i$) are consistent with the MW's measured halo mass and concentration, ($ii$) accrete a Large Magellanic Cloud (LMC)-like ($\approx 10^{11}~M_{\odot}$) subhalo within the last $1.3~\mathrm{Gyr}$ on a realistic orbit, placing them near $50~\mathrm{kpc}$ from the host center at $z\approx 0$, and ($iii$) undergo a $>$1:…

A Survey for Radio Emission from White Dwarfs in the VLA Sky Survey
Ingrid Pelisoli, Laura Chomiuk, Jay Strader, T. R. Marsh, Elias Aydi, Kristen C. Dage, Rebecca Kyer, Isabella Molina, Teresa Panurach, Ryan Urquhart, Thomas J. Maccarone, R. Michael Rich, Antonio C. Rodriguez, E. Breedt, A. J. Brown, V. S. Dhillon, M. J. Dyer, Boris. T. Gaensicke, J. A. Garbutt, M. J. Green, M. R. Kennedy, P. Kerry, S. P. Littlefair, James Munday, S. G. Parsons

A Survey for Radio Emission from White Dwarfs in the VLA Sky Survey
Radio emission has been detected from tens of white dwarfs, in particular in accreting systems. Additionally, radio emission has been predicted as a possible outcome of a planetary system around a white dwarf. We searched for 3 GHz radio continuum emission in 846,000 candidate white dwarfs previously identified in Gaia using the Very Large Array Sky Survey (VLASS) Epoch 1 Quick Look Catalogue. We identified 13 candidate white dwarfs with a counterpart in VLASS within 2". Five of those were foun…

Milky Way-est: Cosmological Zoom-in Simulations with Large Magellanic Cloud and Gaia-Sausage-Enceladus Analogs
Deveshi Buch, Ethan O. Nadler, Risa H. Wechsler, Yao-Yuan Mao
https://arxiv.org/abs/2404.08043

Milky Way-est: Cosmological Zoom-in Simulations with Large Magellanic Cloud and Gaia-Sausage-Enceladus Analogs
We present Milky Way-est, a suite of 20 cosmological cold-dark-matter-only zoom-in simulations of Milky Way (MW)-like host halos. Milky Way-est hosts are selected such that they: ($i$) are consistent with the MW's measured halo mass and concentration, ($ii$) accrete a Large Magellanic Cloud (LMC)-like ($\approx 10^{11}~M_{\odot}$) subhalo within the last $1.3~\mathrm{Gyr}$ on a realistic orbit, placing them near $50~\mathrm{kpc}$ from the host center at $z\approx 0$, and ($iii$) undergo a $>$1:…

This https://arxiv.org/abs/2308.13520 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Tracing the Origins of Mass Segregation in M35: Evidence for Primordially Segregated Binaries
M35 is a young open cluster and home to an extensive binary population. Using Gaia DR3, Pan-STARRS, and 2MASS photometry with the Bayesian statistical software, BASE-9, we derive precise cluster parameters, identify single and binary cluster members, and extract their masses. We identify 571 binaries down to Gaia G = 20.3 and a lower-limit on the binary frequency of f_b = 0.41 +/- 0.02. We extend the binary demographics by many magnitudes faint-ward of previous (radial-velocity) studies of this…

Searching for Triple Systems Unbound by Supernovae
Karina Barboza, Christopher S. Kochanek
https://arxiv.org/abs/2404.06540 https://a…

Searching for Triple Systems Unbound by Supernovae
A large fraction of massive stars are found in higher order systems where the presence of a tertiary may significantly modify the system's evolution. In particular, it can lead to increased numbers of compact object binaries and accelerate their mergers with important implications for gravitational wave observations. Using Gaia, we constrain the number of Galactic supernovae that produce unbound triples. We do this by searching 8 supernova remnants for stars with consistent Gaia parallaxes and …

Shiva and Shakti: Presumed Proto-Galactic Fragments in the Inner Milky Way
Khyati Malhan, Hans-Walter Rix
https://arxiv.org/abs/2403.13051 https://<…

Shiva and Shakti: Presumed Proto-Galactic Fragments in the Inner Milky Way
Using $\textit{Gaia}$ DR3 astrometry and spectroscopy, we study two new substructures in the orbit-metallicity space of the inner Milky Way: $\textit{Shakti}$ and $\textit{Shiva}$. They were identified as two confined, high-contrast overdensities in the $(L_z, E)$ distribution of bright ($G<16$) and metal-poor ($-2.5<\rm{[M/H]}<-1.0$) stars. Both have stellar masses of $M_\star \gtrsim 10^7M_\odot$, and are distributed on prograde orbits inside the Solar circle in the Galaxy. Both structures ha…

Benchmarking the IRDC G351.77-0.53: Gaia DR3 distance, mass distribution, and star formation content
S. D. Reyes-Reyes, A. M. Stutz, S. T. Megeath, Fengwei Xu, R. H. \'Alvarez-Guti\'errez, N. Sandoval-Garrido, H. -L. Liu
https://arxiv.org/abs/2403.02456 https://arxiv.org/pdf/2403.02456
arXiv:2403.02456v1 Announce Type: new
Abstract: While intensively studied, it remains unclear how the star formation (SF) in Infrared Dark Clouds (IRDCs) compares to that of nearby clouds. We study G351.77-0.53 (henceforth G351), a cluster-forming filamentary IRDC. We begin by characterizing its young stellar object (YSO) content. Based on the average parallax of likely members, we obtain a Gaia distance of $\sim\,2.0\pm0.14$ kpc, resolving the literature distance ambiguity. Using our Herschel-derived N(H$_2$) map, we measure a total gas mass of 10200 M$_{\odot}$ (within 11 pc$^2$) and the average line-mass profile of the entire filament, which we model as $\lambda =~1660 (w/\rm pc )^{0.62}\,\,M_{\odot}\,\rm{pc}^{-1}$. At $w < 0.63$ pc, our $\lambda$ profile is higher and has a steeper power-law index than $\lambda$ profiles extracted in Orion A and most of its substructures. Based on the YSOs inside the filament area, we estimate the SF efficiency (SFE) and SF rate (SFR). We calculate a factor of 5 incompleteness correction for our YSO catalog relative to Spitzer surveys of Orion A. The G351 SFE is $\sim 1.8$ times lower than that of Orion A and lower than the median value for local clouds. We measure SFR and gas masses to estimate the efficiency per free-fall time, $\epsilon _{\rm ff}$. We find that $\epsilon_{\rm ff}$ is $\sim$ 1.1 dex below the previously proposed mean local relation, and $\sim\,4.7\times$ below Orion A. These observations indicate that local SF-relations do not capture variations present in the Galaxy. We speculate that cloud youth and/or magnetic fields might account for the G351 inefficiency.

This https://arxiv.org/abs/2402.14984 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Correlations between Ca II H&K Emission and the Gaia M dwarf Gap
The Gaia M dwarf gap, also known as the Jao Gap, is a novel feature discovered in the Gaia DR2 G vs. BP-RP color magnitude diagram. This gap represents a 17 percent decrease in stellar density in a thin magnitude band around the convective transition mass ($\sim 0.35 M_{\odot}$) on the main sequence. Previous work has demonstrated a paucity of Hydrogen Alpha emission coincident with the G magnitude of the Jao Gap in the solar neighborhood. The exact mechanism which results in this paucity is as…

This https://arxiv.org/abs/2402.14984 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Correlations between Ca II H&K Emission and the Gaia M dwarf Gap
The Gaia M dwarf gap, also known as the Jao Gap, is a novel feature discovered in the Gaia DR2 G vs. BP-RP color magnitude diagram. This gap represents a 17 percent decrease in stellar density in a thin magnitude band around the convective transition mass ($\sim 0.35 M_{\odot}$) on the main sequence. Previous work has demonstrated a paucity of Hydrogen Alpha emission coincident with the G magnitude of the Jao Gap in the solar neighborhood. The exact mechanism which results in this paucity is as…

A Statistical and Multiwavelength Photometric Analysis of a Young Embedded Open Star Cluster: IC 1590
A. H. Sheikh, Biman J. Medhi
https://arxiv.org/abs/2402.07750

A Statistical and Multiwavelength Photometric Analysis of a Young Embedded Open Star Cluster: IC 1590
We present a statistical and multiwavelength photometric studies of young open cluster IC 1590. We identified 91 cluster members using $Gaia$ DR3 astrometry data using ensemble-based unsupervised machine learning techniques. From $Gaia$ EDR3 data, we estimate the best-fitted parameters for IC 1590 using the Automated Stellar Cluster Analysis package (ASteCA) yielding the distance $d$ $\sim$ 2.87 $\pm$ 0.02 Kpc, age $\sim$ 3.54 $\pm$ 0.05 Myr, metallicity $z$ $\sim$ 0.0212 $\pm$ 0.003, binarity …

The Sun Remains Relatively Refractory Depleted: Elemental Abundances for 17,412 Gaia RVS Solar Analogs and 50 Planet Hosts
Rayna Rampalli, Melissa K. Ness, Graham H. Edwards, Elisabeth R. Newton, Megan Bedell
https://arxiv.org/abs/2402.16954

The Sun Remains Relatively Refractory Depleted: Elemental Abundances for 17,412 Gaia RVS Solar Analogs and 50 Planet Hosts
The elemental abundances of stars, particularly the refractory elements (e.g., Fe, Si, Mg), play an important role in connecting stars to their planets. Most Sun-like stars do not have refractory abundance measurements since obtaining a large sample of high-resolution spectra is difficult with oversubscribed observing resources. In this work we infer abundances for C, N, O, Na, Mn, Cr, Si, Fe, Ni, Mg, V, Ca, Ti, Al, and Y for solar analogs with Gaia RVS spectra (R=11,200) using the Cannon, a da…

The TESS SPOC FFI Target Sample Explored with Gaia
Lauren Doyle, David J. Armstrong, Daniel Bayliss, Toby Rodel, Vedad Kunovac
https://arxiv.org/abs/2403.02407

The TESS SPOC FFI Target Sample Explored with Gaia
The TESS mission has provided the community with high-precision times series photometry for $\sim$2.8 million stars across the entire sky via the Full Frame Image (FFI) light curves produced by the TESS Science Processing Operations Centre (SPOC). This set of light curves is an extremely valuable resource for the discovery of transiting exoplanets and other stellar science. However, due to the sample selection, this set of light curves does not constitute a magnitude limited sample. In order to…

VLBI detection of nearby (< 100 pc) young stars: Pilot observations
Sergio A. Dzib, Laurent Loinard, Ralf Launhardt, Jazm\'in Ord\'o\~nez-Toro
https://arxiv.org/abs/2403.04355

VLBI detection of nearby (< 100 pc) young stars: Pilot observations
To increase the number of sources with Very Long Baseline Interferometry (VLBI) astrometry available for comparison with the Gaia results, we have observed 31 young stars with recently reported radio emission. These stars are all in the Gaia DR3 catalog and were suggested, on the basis of conventional interferometry observations, to be non-thermal radio emitters and, therefore, good candidates for VLBI detections. The observations were carried out with the Very Long Baseline Array (VLBA) at two…

This https://arxiv.org/abs/2404.04435 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

The Stellar Content of the Young Open Cluster Berkeley 50 (IC 1310)
We observed the Galactic open cluster Berkeley 50 in order to determine its stellar content, distance, and age. We obtained UBV photometry of 1145 stars in a 12.3' $\times$ 12.3' field, and used Gaia proper motions and parallaxes to identify 64 members, of which we obtained spectra of the 17 brightest members. The majority of the observed population we classified as B dwarfs, with the exception of a newly identified red supergiant star, which our spectroscopy shows has a B-type companion. Our s…