Tootfinder

"Star Trek: Infection": VR-Survival-Horror für nervenstarke Trekkies angekündigt
Als vulkanischer Offizier gegen eine unbekannte Macht: Das VR-Spiel "Star Trek: Infection" setzt auf Horror und eine Geschichte über Identitätsverlust.

Red Supergiant Mass Loss and Mass-Loss Rates
Jacco Th. van Loon (Keele University, UK)
https://arxiv.org/abs/2507.15971 https://arxiv…

Red Supergiant Mass Loss and Mass-Loss Rates
This review discusses the causes, nature, importance and observational evidence of mass loss by red supergiants. It arrives at the perception that mass loss finds its origin in the gravity which makes the star a star in the first place, and is a mechanism for the star to equilibrate. This is corroborated by a careful examination of various popular historical and recent empirical mass-loss rate prescriptions and theoretical works, and which provides no evidence for an explicit dependence of red …

Stephenson 2 DFK 52 - Discovery of an exotic red #supergiant in the massive stellar cluster RSGC2: https://www.aanda.org/articles/aa/full_html/2025/08/aa55975-25/aa55975-25.html -> Supergiant star’s gigantic bubble surprises scientists: https://www.chalmers.se/en/current/news/see-supergiant-star-s-gigantic-bubble-surprises-scientists/

Die sechs besten "Star Trek"-Spiele
Früher wie heute beflügelt "Star Trek" die Fantasie – nicht nur in Form von Filmen und Serien. Heise online stellt die sechs besten "Star Trek"-Videospiele vor.
htt…

10,000 Resolved Triples from Gaia: Empirical Constraints on Triple Star Populations
Cheyanne Shariat, Kareem El-Badry, Smadar Naoz
https://arxiv.org/abs/2506.16513

10,000 Resolved Triples from Gaia: Empirical Constraints on Triple Star Populations
We present a catalog of $\sim 10,000$ resolved triple star systems within 500 pc of the Sun, constructed using Gaia data. The triples include main-sequence, red giant, and white dwarf components spanning separations of 10 to 50,000 au. A well-characterized selection function allows us to constrain intrinsic demographics of the triple star population. We find that (a) all systems are compatible with being hierarchical and dynamically stable; (b) mutual orbital inclinations are isotropic for wide…

A Bimodal Metallicity Distribution Function in the Ultra-Faint Dwarf Galaxy Reticulum II
Alice M. Luna, Alexander P. Ji, Anirudh Chiti, Joshua D. Simon, Daniel D. Kelson, Minsung Go, Guilherme Limberg, Ting S. Li, Anna Frebel
https://arxiv.org/abs/2506.16462

A Bimodal Metallicity Distribution Function in the Ultra-Faint Dwarf Galaxy Reticulum II
Star formation in ultra-faint dwarf galaxies (UFDs, $M_* <10^5M_\odot$) is suppressed by reionization, but may not be completely quenched. The metallicity distribution function (MDF) of stars in ultra-faint dwarf galaxies could show these signatures of reionization. However, past studies of UFD MDFs have been limited, because there are only a few dozen red giant branch (RGB) stars in such low-mass galaxies. We present low-resolution Magellan/IMACS spectroscopy of 167 stars in the UFD Reticulum …

A Spectroscopic Hunt for Post-Red Supergiants in the Large Magellanic Cloud II: Turbulent Line Broadening in the Spectra of LMC Yellow Supergiants
Trevor Z. Dorn-Wallenstein, Kaitlyn M. Chen, Samantha C. Wu, Jared A. Goldberg, Anna J. G. O'Grady, Ayanna T. Mann, Poderosa I. Don-Wallanchez
https://arxiv.org/abs/2508.14971

A Spectroscopic Hunt for Post-Red Supergiants in the Large Magellanic Cloud II: Turbulent Line Broadening in the Spectra of LMC Yellow Supergiants
Massive stars in the Hertzsprung gap are a mixed population of objects in short-lived evolutionary phases: yellow supergiants (YSGs) evolving towards the red supergiant (RSG) phase, partially-stripped post-RSGs, and other, rarer outcomes of stellar evolution. Studies of sufficiently large samples of these objects can constrain massive star structure and evolution during these poorly-understood phases. As part of our ongoing program searching for post-RSGs, we characterized the spectral line pro…

Um Wechsel zu fixieren - Wegen Max: Schickt Mercedes Pilot „ins Internat“? #News #Nachrichten

The Type II SN 2025pht in NGC 1637: A Red Supergiant with Carbon-rich Circumstellar Dust as the First JWST Detection of a Supernova Progenitor Star
Charles D. Kilpatrick, Aswin Suresh, Kyle W. Davis, Maria R. Drout, Ryan J. Foley, Alexander Gagliano, Wynn V. Jacobson-Galan, Ravjit Kaur, Kirsty Taggart, Jason Vazquez
https://arxiv.org/abs/2…

The Type II SN 2025pht in NGC 1637: A Red Supergiant with Carbon-rich Circumstellar Dust as the First JWST Detection of a Supernova Progenitor Star
We present follow-up imaging and spectroscopy and pre-explosion imaging of supernova (SN) 2025pht located in NGC 1637 at 12 Mpc. Our spectroscopy shows that SN 2025pht is a Type II SN with broad lines of hydrogen and with minimal line-of-sight extinction inferred from Na I D absorption. NGC 1637 was the target of several epochs of Hubble Space Telescope (HST) and James Webb Space Telescope (JWST) imaging covering the site of SN 2025pht from 31 to 0.7 yr prior to discovery. Using a follow-up HST…

The ALMA Survey of 70 $\mu$m Dark High-mass Clumps in Early Stages (ASHES). XII. Unanchored Forked Stream in the Propogating Path of a Protostellar Outflow
Shuting Lin, Siyi Feng, Patricio Sanhueza, Ke Wang, Zhi-Yu Zhang, Yichen Zhang, Fengwei Xu, Junzhi Wang, Kaho Morii, Hauyu Baobab Liu, Sheng-Yuan Liu, Lile Wang, Hui Li, Daniel Tafoya, Willem Baan, Shanghuo Li, Giovanni Sabatini

The ALMA Survey of 70 $μ$m Dark High-mass Clumps in Early Stages (ASHES). XII. Unanchored Forked Stream in the Propogating Path of a Protostellar Outflow
Outflows are key indicators of ongoing star formation. We report the discovery of an unanchored forked stream within the propagating path of an extremely young protostellar outflow in the 70 $μ$m-dark clump G34.74-0.12, based on ALMA 1.3 mm observations with an angular resolution of 1''.6 (~ 5000 au). This outflow originate from a 9.7 $M_{\odot}$ core, exhibits a fork-shaped stream structure in its red-shifted lobe, which is traced by CO (2-1), SiO (5-4), and H$_2$CO (3$_{0,3}$-2$_{0,2}$). It …

Nostalgie Pur: Neues "Star Wars"-Spiel bringt digitale Spielsets auf die Quest 3
"Star Wars: Beyond Victory" bietet auf der Meta Quest 3 eine neue Geschichte, digitale Actionfiguren und Diorama-Welten samt holografischer Rennstrecken.

🎼🎤“Sure it’s — mid September, once more” 🎶

Many people do not understand how cooked the German “left” is.

The impact of rotational mixing in intermediate-age star clusters with extended main-sequence turn-offs and extended red clumps
Lorenzo Martinelli, Andrea Miglio, Ga\"el Buldgen, Hannah Schunker, Cyril Georgy, Giacomo Cordoni, Karsten Brogaard, Patrick Eggenberger, Eoin Farrell
https://arxiv.org/abs/2509.13601

The impact of rotational mixing in intermediate-age star clusters with extended main-sequence turn-offs and extended red clumps
The extended main-sequence turn-offs (eMSTOs) and extended red clumps (eRCs) observed in intermediate-age star clusters challenge the traditional understanding of clusters as simple stellar populations. Recently, eMSTOs have been interpreted as signatures of stellar rotation. In this work, we test the effectiveness of rotational mixing in shaping the color-magnitude diagram (CMD) of star clusters. We computed a set of separate single-age synthetic stellar populations, referred to as "Base Stell…

A profile of Katie Feeney, an influencer and a rising star in sports media with 8M TikTok followers, as ESPN hires her to appear across its social channels (Ben Strauss/Washington Post)

From TikTok to ESPN, Katie Feeney is the future of sports media
Chasing content from the Rose Bowl to the red carpet with a 22-year-old influencer and rising media star.

I like the Zapatista, I find them pretty cool, I don’t sympathize with them or anything, I just think their approach is interesting.
https://en.wikipedia.org/wiki/Zapatista_Army_of_National_Liberation

Hulu wird in die Disney -App integriert
Disney schafft Hulu nach der Übernahme als eigenständigen Streaming-Dienst ab und integriert ihn in Disney . Darin soll Hulu den Star-Bereich ersetzen.
https://www.

TNO colours provide new evidence for a past close flyby of another star to the Solar System
Susanne Pfalzner, Frank W. Wagner, Paul Gibbon
https://arxiv.org/abs/2507.06693

TNO colours provide new evidence for a past close flyby of another star to the Solar System
Thousands of small bodies, known as trans-Neptunian objects (TNOs), orbit the Sun beyond Neptune. TNOs are remnants of the planets' formation from a disc of gas and dust, so it is puzzling that they move mostly on eccentric orbits inclined to the planetary plane and show a complex red-to-grey colour distribution. A close stellar flyby can account for the TNOs' dynamics, but it is unclear if this can also explain the correlation between their colours and orbital characteristics. Assuming an init…

Transient star B/R ratio and star formation in $z\gtrsim 1$ lensed galaxies
Sung Kei Li, Jose M. Palencia, Jose M. Diego, Jeremy Lim, Patrick L. Kelly, Ashish K. Meena, James Nianias, Hayley Williams, Liliya L. R. Williams, Adi Zitrin
https://arxiv.org/abs/2506.17565

Transient star B/R ratio and star formation in $z\gtrsim 1$ lensed galaxies
The extreme magnification from galaxy clusters and microlenses therein allows the detection of individual, luminous stars in lensed galaxies as transient events, and hence provides a valuable window into the high mass stellar population in $z>1$ galaxies. As these bright stars can only be formed at specific ages, the relative abundance of transient events at blue (B) and red (R) optical wavelengths ($B/R$ ratio) can provide insights into the star formation history of lensed galaxies. Here, we f…

JWST/NIRCam imaging of the Bipolar Planetary Nebula NGC 6537: the (Infra)red Spider, Revealed
Joel Kastner (Rochester Institute of Technology, USA), Paula Moraga Baez (RIT), Bruce Balick (University of Washington, USA), Rodolfo Montez Jr. (CfA/SAO, USA), Caroline Geiser (Max Planck Institute, Germany), Mikako Matsuura (Cardiff University, UK), Jason Nordhaus (RIT), Miguel Santander-Garcia (OAN, Spain)

JWST/NIRCam imaging of the Bipolar Planetary Nebula NGC 6537: the (Infra)red Spider, Revealed
We present James Webb Space Telescope (JWST) near-infrared (NIRCam) Br$α$, H$_2$, [Fe II], and PAH imaging of the molecule-rich, high-excitation bipolar planetary nebula (PN) NGC 6537 (the Red Spider), complemented by new ALMA and Chandra observations and archival HST images. The resulting multiwavelength view of the Red Spider establishes the detailed lobe/torus structure of the nebula and the mass-loss history of its progenitor star. The extinction-penetrating JWST/NIRCam Br$α$ and PAH and …

Antonio Gates' prowess in crucial situations vaulted Chargers star into Hall of Fame https://www.nytimes.com/athletic/6523698/2025/07/30/antonio-gates-pro-football-hall-of-fame-chargers/

VR- und KI-Brillen sind nur Brücken: Der heimliche Star heißt Augmented Reality
Während VR lange Zeit lautstark um Aufmerksamkeit buhlte, schleicht sich AR in unser Leben, um zu bleiben – auf dem Rücken von Mixed Reality und Smart Glasses.

Structural evolution of quiescent galaxies at intermediate redshift at UV and red rest-frame wavelengths
Michele Pizzardo, Ivana Damjanov, Jubee Sohn, Margaret J. Geller
https://arxiv.org/abs/2507.10675

Structural evolution of quiescent galaxies at intermediate redshift at UV and red rest-frame wavelengths
We model the wavelength dependence of structural parameters for a mass-limited sample ($M_\star>10^{10}M_\odot$) of $\sim27,000$ quiescent galaxies with $0.2 < z < 0.6$ using $grizy$ photometry from Subaru/Hyper Suprime-Cam and dense spectroscopy from the HectoMAP survey. Based on Sérsic profile fits in all five bands, we estimate the circularized half-light radius $R_{e,c}$ and Sérsic index $n$ in two rest-frames: UV (3500 Å) and red (7000 Å). Combined with $M_\star$, $z$, and D$_n4000$, $…

Strength in Numbers: Red Galaxies Bolster the Cosmic Star Formation Rate Density at z > 3
L. Barrufet, J. S. Dunlop, R. Begley, S. Flury, D. J. McLeod, K. Arellano-Cordova, A. Carnall, F. Cullen, C. T. Donnan, F. Liu, R. McLure, D. Scholte, T. M. Stanton, R. Cochrane, C. Conselice, R. Ellis, P. G. P\'erez-Gonz\'alez, R. Gottumukkala, N. A. Grogin, G. D. Illingworth, A. M. Koekemoer, D. Magee, M. Michalowski

Strength in Numbers: Red Galaxies Bolster the Cosmic Star Formation Rate Density at z > 3
A comprehensive account of the cosmic star-formation history demands an accurate census of dust-enshrouded star formation over cosmic time. We provide strong new constraints from a large sample of 777 red galaxies, selected based on their dust-reddened, rest-frame UV-optical emission. This sample of 777 galaxies spans $1 < z < 8$ and is selected from PRIMER JWST NIRCam and HST COSMOS optical data, ensuring robust colour criteria. The SEDs indicate that these dust-reddened galaxies are star-form…

Stephenson 2 DFK 52: Discovery of an exotic red supergiant in the massive stellar cluster RSGC2
Mark A. Siebert, Elvire De Beck, Guillermo Quintana-Lacaci, Wouter Vlemmings
https://arxiv.org/abs/2507.11609

Stephenson 2 DFK 52: Discovery of an exotic red supergiant in the massive stellar cluster RSGC2
Atacama Large Millimeter/submillimeter Array (ALMA) observations at 1.3mm have recently revealed surprising complexity in the circumstellar environment of DFK 52, a red supergiant (RSG) located in the Stephenson 2 massive open cluster. We provide an initial characterisation of the star's mass-loss properties by studying its circumstellar emission in continuum, $^{12}$CO, $^{13}$CO, and SiO rotational lines. We find that DFK 52 is surrounded by an extremely large outflow (up to 50,000 au in radi…

I would like to remind you that Neuronationalism, (which is just autistic fascism), is increasingly on the rise.
#Fascism #Autism #ActuallyAutistic

Tip of the Red Giant Branch Distances to NGC 1316, NGC 1380, NGC 1404, & NGC 4457: A Pilot Study of a Parallel Distance Ladder Using Type Ia Supernovae in Early-Type Host Galaxies
Max J. B. Newman, Conor Larison, Saurabh W. Jha, Kristen B. W. McQuinn, Evan D. Skillman, Andrew E. Dolphin, Mi Dai, D. Andrew Howell, Curtis McCully, K. Azalee Bostroem, Daichi Hiramatsu, Craig Pellegrino, Estefania Padilla Gonzalez

Tip of the Red Giant Branch Distances to NGC 1316, NGC 1380, NGC 1404, & NGC 4457: A Pilot Study of a Parallel Distance Ladder Using Type Ia Supernovae in Early-Type Host Galaxies
Though type-Ia supernovae (SNe Ia) are found in all types of galaxies, recent local Hubble constant measurements have disfavored using SNe Ia in early-type or quiescent galaxies, aiming instead for better consistency with SNe Ia in star-forming, late-type host galaxies calibrated by Cepheid distances. Here we investigate the feasibility of a parallel distance ladder using SNe Ia exclusively in quiescent, massive ($\log M_*/M_{\odot} \geq 10$) host galaxies, calibrated by tip of the red giant br…

Fundamental Parameters for Totally Eclipsing Contact Binaries Observed by TESS
Xu Ding, KaiFan Ji, ZhiMing Song, XueFen Tian, JinLiang Wang, ChuanJun Wang, QiYuan Cheng, JianPing Xiong
https://arxiv.org/abs/2507.11838

Fundamental Parameters for Totally Eclipsing Contact Binaries Observed by TESS
Totally eclipsing contact binaries provide a unique opportunity to accurately determine mass ratios through photometric methods alone, eliminating the need for spectroscopic data. Studying low mass ratio (LMR) contact binaries is crucial for advancing our understanding of binary star evolution and the formation of rare optical transients known as red novae. We identified 143 totally eclipsing contact binaries from the Transiting Exoplanet Survey Satellite. These high-precision light curves reve…

Discovery of Multiply Ionized Iron Emission Powered by an Active Galactic Nucleus in a z~7 Little Red Dot
Erini Lambrides, Rebecca Larson, Taylor Hutchison, Pablo Arrabal Haro, Bingjie Wang, Brian Welch, Dale D. Kocevski, Chris T. Richardson, Casey Papovich, Jonathan R. Trump, Sarah E. I. Bosman, Jane R. Rigby, Steven L. Finkelstein, Guillermo Barro, Jacqueline Antwi-Danso, Arianna Long, Anthony J. Taylor, Jenna Cann, Jeffrey McKaig, Anton M. Koekemoer, Nikko J. Cleri, Hollis B. Akins,…

Discovery of Multiply Ionized Iron Emission Powered by an Active Galactic Nucleus in a z~7 Little Red Dot
Some of the most puzzling discoveries of NASA's JWST in the early Universe surround the surprising abundance of compact red sources, which show peculiar continuum shapes and broad hydrogen spectral lines. These sources, dubbed ``Little Red Dots'' or LRDs, have been the subject of intense inquiry in the literature. Any of the proposed explanations, from accreting super-massive black holes ensconced in ultra-dense gas to extremely compact star-systems, has significant implications for the earlies…

Study of the peculiar variable star Khavchenko 1
A. E. Maslak, D. V. Denisenko
https://arxiv.org/abs/2507.00149 https://arxiv.org/pdf…

Study of the peculiar variable star Khavchenko 1
The work is devoted to the study of the peculiar variable star Khavchenko 1 in Auriga. It was discovered by the 7th grade student Sergey Khavchenko in 2020. The brightness of the star varies with an amplitude of about 0.4 magnitude and the period of 4.213 days. Initially the star could not have been attributed to any known type of variability. Its light curve looks like the upside-down light curve of the eclipsing binary similar to that of luminous red nova V1309 Scorpii a few years before the …

Asteroseismology of 35 Kepler and TESS $\delta$ Scuti stars near the red edge of the instability strip. The limitations of $\delta$ Scuti stars for dating open clusters
David Pamos Ortega
https://arxiv.org/abs/2509.05684

Asteroseismology of 35 Kepler and TESS $δ$ Scuti stars near the red edge of the instability strip. The limitations of $δ$ Scuti stars for dating open clusters
Aims. The aim of this work is to determine the maximum ages that can be unambiguously established for $δ$ Sct stars using seismic observables, and, by extension, the oldest open clusters that can be dated using this type of star. Methods. I estimate the large frequency separation using various techniques applied to two samples of $δ$ Sct located near the red edge of the instability strip. One sample consists of 18 targets observed by the Kepler mission, and the other comprises 17 targets obse…

Investigating the Growth of Little Red Dot Descendants at z<4 with the JWST
Jean-Baptiste Billand, David Elbaz, Fabrizio Gentile, Maxime Tarrasse, Maximilien Franco, Benjamin Magnelli, Emanuele Daddi, Yipeng Lyu, Avishai Dekel, Fabio Pacucci, Valentina Sangalli, Mark Dickinson, Mauro Giavalisco, Benne W. Holwerda, Dale D. Kocevski, Anton M. Koekemoer, Vasily Kokorev, Ray A. Lucas, Pablo G. P\'erez-Gonz\'alez

Investigating the Growth of Little Red Dot Descendants at z<4 with the JWST
One of JWST's most remarkable discoveries is a population of compact red galaxies known as Little Red Dots (LRDs). Their existence raises many questions about their nature, origin, and evolution. These galaxies show a steep decline in number density-nearly two orders of magnitude-from $z=6$ to $z=3$. In this study, we explore their potential evolution by identifying candidate descendants in CEERS, assuming a single evolutionary path: the development of a blue star-forming outskirt around the re…

First images of Antares photosphere from spectropolarimetry
Quentin Pilate, Eric Josselin, Agn\`es L\`ebre, Arturo L\'opez Ariste, Philippe Mathias, Alexis Lavail
https://arxiv.org/abs/2507.08614

First images of Antares photosphere from spectropolarimetry
Antares is the closest red supergiant (RSG) to Earth. The discovery of linear polarization in the atomic lines of the star opens the path to produce direct images of the photosphere, hence probing the dynamics at the surface. We analyze this linear polarization signals following the same scheme as has been previously done for the RSG Betelgeuse, and find that they are comparable in all its details. This allows us to use the same models for the analysis of these polarization signals in both star…

Little Red Dots Are Nurseries of Massive Black Holes
Fabio Pacucci, Lars Hernquist, Michiko Fujii
https://arxiv.org/abs/2509.02664 https://arxiv.org/pdf/25…

Little Red Dots Are Nurseries of Massive Black Holes
The James Webb Space Telescope (JWST) has revealed a previously unknown population of compact, red galaxies at $z \sim 5$, known as "Little Red Dots" (LRDs). With effective radii of $\sim 100$ pc and stellar masses of $10^9-10^{11} \, \rm M_\odot$, a purely stellar interpretation implies extreme central densities, $ρ_\star\sim10^4-10^5 \, \rm M_\odot \, pc^{-3}$ and in some cases up to $\sim 10^9 \, \rm M_\odot \, pc^{-3}$, far exceeding those of globular clusters. At such densities, the dynam…

Probing Binary Architectures of Lithium-Rich Giants in GALAH with COSMIC and Stellar Models
Maryum Sayeed, Selina Yang, Giulia Cinquegrana, Melissa K. Ness, Katelyn Breivik, Andrew R. Casey, Sven Buder, Amanda I. Karakas
https://arxiv.org/abs/2507.05359

Probing Binary Architectures of Lithium-Rich Giants in GALAH with COSMIC and Stellar Models
Surface lithium is depleted when a star goes through the first dredge-up phase, yet $1\%$ of red giants are found to be Li-rich. The formation mechanism for these remains uncertain. We combine observational constraints from GALAH Li-rich giants, with the binary population synthesis code COSMIC to investigate system properties of these objects assuming binary mass transfer. By evolving 9 million binary systems, we find that binary histories most consistent with observational constraints are mass…

MARTA: The connection between chemical enrichment, feedback, and dust in a Wolf-Rayet galaxy at z${\sim}$2
Mirko Curti, Elisa Cataldi, Francesco Belfiore, Bianca Moreschini, Magda Arnaboldi, Martyna Chru\'sli\'nska, Filippo Mannucci, Alessandro Marconi, Quirino D'Amato, Stefano Carniani, William M. Baker, Annalisa De Cia, Nimisha Kumari, Amirnezam Amiri, Giovanni Cresci, Chiaki Kobayashi, Fergus Cullen, Anna Feltre, Roberto Maiolino

MARTA: The connection between chemical enrichment, feedback, and dust in a Wolf-Rayet galaxy at z${\sim}$2
We present the analysis of the stellar and interstellar medium (ISM) properties of MARTA-4327, a star-forming galaxy at z=2.224 observed by means of deep JWST/NIRSpec spectroscopy in both medium- and high-resolution gratings as part of the "Measuring Abundances at high Redshift with the Te Approach" (MARTA) programme. We report one of the highest-redshift detections of the Wolf-Rayet (WR) blue and red bumps in a non-lensed system. The broad He ii$λ$4686 feature is consistent with a young (${\s…

Effect of Matter Accretion on Lithium Enhancement of Giants
Xuefeng Li, Jianrong Shi, Yan Li, Hongliang Yan, Jinghua Zhang, Fei Guo
https://arxiv.org/abs/2508.00405 https://

Effect of Matter Accretion on Lithium Enhancement of Giants
A subset of low-mass giants ($<2.2\,M_{\odot}$) exhibit anomalous lithium enhancement behavior, which is still an open topic. Given that more massive giants retain more surface lithium, increasing mass by accreting circumstellar matter could be a channel to enrich lithium. We evaluate this process in the current work. Using MESA, we construct a model of matter accretion, including mass loss, that evolves a star from the main sequence turnoff to the red giant branch tip. The mean accretion rate …

Need for PRIMA to understand the nature and ISM physical conditions of HST-dark galaxies
Carlotta Gruppioni, Lee Armus, Matthieu Bethermin, Laura Bisigello, Denis Burgarella, Francesco Calura, Ivan Delvecchio, Andrea Enia, Andreas Faisst, Francesca Pozzi, Giulia Rodighiero, Alberto Traina, Livia Vallini
https://arxiv.org/abs/2509.01988

Need for PRIMA to understand the nature and ISM physical conditions of HST-dark galaxies
One of the main open issues in galaxy formation and evolution is the early assembly of the most massive galaxies and their contribution to the stellar mass and star formation rate densities at early epochs. Massive red sources already in place at z > 2 to 3 have been found in deep Spitzer-IRAC and ALMA surveys. They are often called optically and near-IR dark, or HST-dark, being undetected even in the deepest HST frames. The submillimeter (i.e., ALMA) detection of these sources confirms their h…

Fine-Tuned Supernova or Failed Explosion? Decoding the Origins of the G3425 Binary
Zsolt Regaly, Viktoria Frohlich, Jozsef Vinko
https://arxiv.org/abs/2506.20386

Fine-Tuned Supernova or Failed Explosion? Decoding the Origins of the G3425 Binary
A binary system (G3425) consisting of a massive unseen component and a red giant star on a nearly circular orbit was recently discovered. The formation of such a system is puzzling because orbital stability generally breaks down due to the large mass loss from the system caused by the SN explosion while forming the unseen component. Analytical solutions of the variable-mass two-body problem suggest that the explosion should have occurred when the component was close to its apocenter to explain …