Tootfinder

Disney und Webtoon bringen 35.000 Digital-Comics im Abo
In Partnerschaft mit Webtoon will Disney ein neues Comic-Abonnement aufbauen. Zumindest in den USA sollen Comics zudem Teil des Disney -Abos werden.
https://w…

Sources: Chinese hardware maker Goertek tightened its grip on Meta's AI glasses supply chain, including making "Hypernova", through a spate of dealmaking (Financial Times)
https://www.ft.com/content/b397f80d-5772-483b-9e48-b9fa83279c75

ウチで代表的なのは、iPhoneとかのモバイル表示で、下部固定したメニューが動いちゃったりチラチラするなどの不具合かな。みづらいね！

Dutch drought still getting worse. Precipitation deficit already at 238 mm (not counting this year's headstart in March); that's double the peak in a median year and in the worst 5% of years on record.

The Chicago-Kent, Illinois Tech IP Program cordially invites you to: "What’s the Skinny? Drug Labels and Patent Infringement," Tuesday, October 28, 2025 at 12-1 pm.
The panel is open to the public but please RSVP in advance here: https://

Inside the discussions between OpenAI and talent agencies about the video app Sora; some agents say studios have been too reluctant to challenge tech giants (Winston Cho/The Hollywood Reporter)
https://www.hollywoodreporter.com/business

How Sam Altman Played Hollywood
OpenAI’s CEO brazenly regurgitated major studios’ characters to allow video app Sora 2 to spit out clips tailor-made for users. Insiders at the major agencies are alarmed — and some wonder whether the studios are doing enough.

Es lohnt sich hin und wieder in der "on this day" Kategorie bei Wikipedia zu stöbern. 😁
#pastpuzzle 372
🟩🟩🟨🟥 ( 64)
🟩🟩🟩🟩 (0)
▪️▪️▪️▪️
▪️▪️▪️▪️
2/4 🥈
https://www.pastpuzzle.de…

My Oxford Year Quand l’amour, la perte, la poésie et le pardon se rencontrent: https://blog.rmendes.net/2025/08/17/my-oxford-year-quand-lamour.html

Die F-35-Kosten explodieren – bis zu 1,3 Mrd. CHF mehr.
2020 versprach der Bundesrat einen Fixpreis. Jetzt will er ohne Volksentscheid weitermachen.
✍️ Petition unterzeichnen
#F-35 #StopF-35

Stopp dem F-35-Debakel - Keine neuen Kampfjet-Kosten ohne Volksentscheid!
Der Bundesrat will Milliarden-Mehrkosten für F-35-Kampfjets einfach durchwinken, ohne das Volk zu fragen. Wir sagen: Stopp! Unterzeichne jetzt unsere Petition für Transparenz und einen neuen Volksentscheid. #F-35 #StopF-35

lmao

Crosslisted article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Gravitational Recoil and Suppression of Super Massive Black Hole Seeds in the Early Universe
Bisweswar Sen

Replaced article(s) found for cs.CC. https://arxiv.org/list/cs.CC/new
[1/1]:
- Fast quantum algorithm for differential equations
Bagherimehrab, Nakaji, Wiebe, Brennen, Sanders, Aspuru-Guzik

Menschen wackeln mit Zehen und essen Langos

The long arm of the lawless.
https://www.theguardian.com/us-news/2025/sep/13/charlie-kirk-mexican-congressional-staffer-resigns?CMP=Share_iOSApp_Other

@… https://mastodon.bsd.cafe/@grahamperrin/115210336847880790

Mehrkosten in Höhe von 6 Milliarden? Das sind nicht „Mehrkosten“, das ist glatt die Verdopplung vom „Fixpreis“
https://social.pmj.rocks/@srfnewsrss/115214744478425029

Impressed and pleased to see that the #SFPublicDefender's office won $3.4 million in philanthropic funding to support immigrant legal defense.
Bravo to #ManoRaju and his team for this effort to mitigate the budget cuts.

#SilentSunday

🇺🇦 #NowPlaying on KEXP's #MechanicalBreakdown
Delectro:
🎵 Mass Control (Bloody Mary Remix)
#Delectro
https://dame-music.bandcamp.com/album/mass-control-ep-incl-bloody-mary-remix
https://open.spotify.com/track/0LNSrsdvo0iRwGgMpenJD3

At 9:35 PM CST tonight I saw a brilliant bolide meteor ☄️ blaze straight overhead in downtown #Nashville…right in the middle of an outdoor concert, under planes, lasers, and brutal light pollution. Nobody else noticed it🤦‍♂️, but I knew what I saw.
Luckily my friend Marc, 21 miles north of the city, with an all-sky cam, caught it crystal clear! Sharing both his original and enhanced frames…

I’m upgrading a #Rails app from 7.1 to 8.02. The App uses tailwindcss-rails even though I don’t use any #TailwindCss in the app. I had problems taking Tailwind to 4.x so I pinned it to ~> 3.3.1 per the README. I’d love to get over the hump and get it all the way to 4.x. but there was an @forms plugin t…

Dichte der #Windkraftanlagen je #Bundesland pro 10 km² in Deutschland mit Stand vom 15.10.2025.
Nur in Betrieb befindliche Anlagen berücksichtigt.
Die „Ausschließliche Wirtschaftszone“ (Offshore) ist ausgenommen.
👉 Zusatzlesestoff:

Die FDP Kondome haben eine 100% Erfolgsquote, weil niemand mit jemanden schläft der FDP Kondome benutzt. Ist das die Innovation von der sie immer sprechen?
— @…, 17.09.2025

Mit anderen worten: Amherd hat brandschwarz gelogen, und das stimmvolk wurde bei der F-35-abstimmung mit dem märchen vom fixpreis bewusst getäuscht.
https://tooting.ch/@buercher/115044136285947016

🚨 Abeer’s family is in the danger zone in North Gaza and must move South to survive Israel’s genocide.
Her message to me on Signal just now:
“I actually need more than $3,000 USD. My campaign is in Australian dollars, and the amount I currently have on the link is not enough.
We spoke with a driver (I got his number from Joy), and he asked for $2,000 USD just for transportation. The cost of a tent is around $1,500 USD, and renting the land also costs a large amount.”
…

So _that's_ how printers work

Broncos LB Nik Bonitto: Breakout 2024 season has 'made me hungrier' https://www.nfl.com/news/broncos-lb-nik-bonitto-breakout-2024-season-has-made-me-hungrier

Profis.
https://www.npr.org/2025/08/16/nx-s1-5504196/trump-putin-summit-documents-left-behind

Very bit disappointed that bugout bags don't include bugs.

TikTok is updating its Community Guidelines, adding new rules for Live creators, including a requirement that commercial content must be disclosed (Sarah Perez/TechCrunch)
https://techcrunch.com/2025/08/15/tiktoks-new-guideli…

TikTok's new guidelines add subtle changes for LIVE creators, AI content, and more | TechCrunch
TikTok is preparing an update to its Community Guidelines, which dictate the rules for participating on the social video platform as well as what standards the company uses to determine the videos that make it onto its For You feed.

Hydrodynamical models of the $\beta$ Lyr A circumstellar disc
Kristi\'an Vitovsk\'y (Charles University, Faculty of Mathematics and Physics, Institute of Astronomy, Heidelberger Institut f\"ur Theoretische Studien), Miroslav Bro\v{z} (Charles University, Faculty of Mathematics and Physics, Institute of Astronomy)
https://arxiv…

Hydrodynamical models of the $β$ Lyr A circumstellar disc
We study dynamics of circumstellar discs, with a focus on the $β$ Lyrae A binary system. This system with ongoing mass transfer has been extensively observed, using photometry, spectroscopy and interferometry. All these observations were recently interpreted using a radiation-transfer kinematic model. We modified the analytical Shakura-Sunyaev models for a general opacity prescription, and derived radial profiles of various quantities. These profiles were computed for the fixed accretion rat…

Crosslisted article(s) found for cs.CC. https://arxiv.org/list/cs.CC/new
[1/1]:
- Deterministic polynomial factorisation modulo many primes
Daniel Altman
https://…

@…
A FreeBSD community highlight (pinned) in Reddit: <https://www.reddit.com/r/freebsd/comments/1nh3z73/freebsd_150alpha2_now_a…

Elon Musk kauft Tesla-Aktien für eine Milliarde US-Dollar
Für Musk steht im November ein Aktionärsvotum an, das ihm ein großes neues Aktienpaket bescheren soll. Vorher stimmt der Tesla-Chef die Börse freundlicher.

Capitalism is the larval stage of fascism.

White Dwarfs with Infrared Excess in the HET Dark Energy Experiment
Rudy A. Morales, Barbara G. Castanheira, Jayden Blanchard, Detlev Koester, P\'eter N\'emeth, S. O. Kepler, Erin Mentuch Cooper, Karl Gebhardt
https://arxiv.org/abs/2509.12116

White Dwarfs with Infrared Excess in the HET Dark Energy Experiment
White dwarfs with infrared excess emission provide a window into the late stages of stellar evolution and the dynamics of circumstellar environments. Using data from the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX), we characterized 30 white dwarfs exhibiting infrared excess, including 29 DA and 1 DB stars. While an infrared excess can arise from dusty disks or cool (sub-)stellar companions, our sample is limited to stellar companions due to our selection based on SDSS photometry, whi…

On the Hardness of Order Finding and Equivalence Testing for ROABPs
C. Ramya, Pratik Shastri
https://arxiv.org/abs/2509.13238 https://arxiv.org/pdf/2509.13…

On the Hardness of Order Finding and Equivalence Testing for ROABPs
The complexity of representing a polynomial by a Read-Once Oblivious Algebraic Branching Program (ROABP) is highly dependent on the chosen variable ordering. Bhargava et al. prove that finding the optimal ordering is NP-hard, and provide some evidence (based on the Small Set Expansion hypothesis) that it is also hard to approximate the optimal ROABP width. In another work, Baraskar et al. show that it is NP-hard to test whether a polynomial is in the $\mathrm{GL}_n$ orbit of a polynomial of spa…

Noch einige der zuletzt hier besonders häufig geteilten #News:
Wegen KI-Zusammenfassungen: US-Verlagshaus reicht Klage gegen Google ein

Periodic Variations in Visible Light Brightness as Tracers of Fine Coronal Structures
Nathalia Alzate, Simone Di Matteo
https://arxiv.org/abs/2509.12009 https://

Periodic Variations in Visible Light Brightness as Tracers of Fine Coronal Structures
The quiescent or dynamic nature of fine scale ray-like features in the sun corona, observed in visible light, is still an open question. Here, we show that most of daily and hourly periodic variations in visible light brightness of the high corona (up to 15 Rs) are aligned to the tip of streamers and are consistent with the periodicity of plasma release from simulations of tearing-induced magnetic reconnection at the heliospheric current sheet. The areas in which we detect periodicities can be …

An elementary proof that linking problems are hard
Shannon Cheng, Anna Chlopecki, Saarah Nazar, Eric Samperton
https://arxiv.org/abs/2509.13120 https://arx…

An elementary proof that linking problems are hard
We give a new, elementary proof of what we believe is the simplest known example of a ``natural'' problem in computational 3-dimensional topology that is $\mathsf{NP}$-hard -- namely, the \emph{Trivial Sublink Problem}: given a diagram $L$ of a link in $S^3$ and a positive integer $k$, decide if $L$ contains a $k$ component sublink that is trivial. This problem was previously shown to be $\mathsf{NP}$-hard in independent works of Koenig-Tsvietkova and de Mesmay-Rieck-Sedgwick-Tancer, both of wh…

Starlink-Alternative von Amazon soll Anfang 2026 in Deutschland verfügbar sein
Im Frühjahr soll Amazons Satelliteninternet in fünf Staaten gebucht werden können. Dazu gehört dem US-Konzern zufolge neben den USA auch Deutschland.

Chemical Abundances of M and G Dwarfs in the Hyades and Coma Berenices Open Clusters from APOGEE Spectra
Deusalete Vilar, Diogo Souto, Katia Cunha, Anderson andrade-silva, Veronica Loaiza-Tucuri, Fabio Wanderley, Verne V. Smith, Vinicius Grilo, Cintia F. Martinez, Barbara Rojas-Ayala, Zachary Way
https://arxiv.org/abs/2509.11938

Chemical Abundances of M and G Dwarfs in the Hyades and Coma Berenices Open Clusters from APOGEE Spectra
Open clusters are one of the best astrophysical laboratories we have available for stellar astrophysics studies. This work presents metallicities and individual abundances for fourteen M dwarfs and six G dwarfs from two well-known open clusters: Hyades and Coma Berenices. Our analysis is based on near-infrared (1.51--1.69 $μ$m), high-resolution ($R \sim 22,500$) spectra obtained from the SDSS IV/APOGEE Survey. Using one-dimensional, plane-parallel MARCS model atmospheres, the APOGEE line list,…

[2025-09-17 Wed (UTC), 2 new articles found for cs.CC Computational Complexity]
toXiv_bot_toot

Einige der zuletzt hier besonders häufig geteilten #News:
Statusbericht: Fortschritte bei der Energiewende – doch Reiche will drosseln

Magnetic reconnection sustains the mass budget of the solar wind
Yajie Chen, Hardi Peter, Damien Przybylski, Haruhisa Iijima, Lakshmi Pradeep Chitta
https://arxiv.org/abs/2509.11692

Magnetic reconnection sustains the mass budget of the solar wind
The solar wind originates from regions of open magnetic fields on the Sun, but the relevant processes remain unsolved. We present a self-consistent numerical model of the source region of the wind, in which jets similar to those observed on the Sun naturally emerge due to magnetic reconnection between closed and open magnetic fields. In this process material is transferred from closed to open field lines and fed into the solar wind.We quantify the mass flux through the magnetic field connected …

Replaced article(s) found for cs.CC. https://arxiv.org/list/cs.CC/new
[1/1]:
- On guarded extensions of MMSNP
Alexey Barsukov, Florent R. Madelaine
https://

The Curious Case of V CVn
Michael T. Power, Hilding R. Neilson, Galina Sherren
https://arxiv.org/abs/2509.11672 https://arxiv.org/pdf/2509.11672

The Curious Case of V CVn
Decades of observations on the star V Canum Venaticorum (V CVn) have revealed an unusual inverse relationship between its linear polarization and light curves (sometimes with a lead/lag time between them) and an almost constant polarization position angle. One theory proposed to explain this behaviour is the existence of a bow shock driven by a spherically symmetric time-varying dusty wind from the star, which is assumed to vary due to radial pulsations. To test this hypothesis, this study uses…

Efficient Polynomial Identity Testing Over Nonassociative Algebras
Partha Mukhopadhyay, C Ramya, Pratik Shastri
https://arxiv.org/abs/2509.11349 https://ar…

Efficient Polynomial Identity Testing Over Nonassociative Algebras
We design the first efficient polynomial identity testing algorithms over the nonassociative polynomial algebra. In particular, multiplication among the formal variables is commutative but it is not associative. This complements the strong lower bound results obtained over this algebra by Hrubeš, Yehudayoff, and Wigderson (2010) and Fijalkow, Lagarde, Ohlmann, and Serre (2021) from the identity testing perspective. Our main results are the following: (1) We construct nonassociative algebras …

Dienstag: Vereinbarung im Streit um TikTok-Verbot, Debatte um Verbrenner-Aus
USA und China erzielen Einigung SPD-Landeschef gegen striktes Verbrenner-Aus iOS 26 zum Download bereit Ministerin Reiche bremst Handyverbot mit Folgen

Compression, Impact and Hot Rebound Flows from Coronal Rain Downflows
Jamal Wachira, Patrick Antolin
https://arxiv.org/abs/2509.11627 https://arxiv.org/pdf…

Compression, Impact and Hot Rebound Flows from Coronal Rain Downflows
Understanding the processes associated with coronal rain due to the thermal non-equilibrium (TNE) and thermal instability (TI) scenario can help us understand coronal heating. We aim to study the properties of a quiescent coronal rain event and its effect on the solar atmosphere. We utilise space-based data from the \textit{High-Resolution Imager in Extreme Ultraviolet} of Solar Orbiter, the \textit{Atmospheric Imaging Assembly} of the Solar Dynamics Observatory, and the Slit-Jaw Imager (SJI) f…

Lower bounds for planar Arithmetic Circuits
C. Ramya, Pratik Shastri
https://arxiv.org/abs/2509.11322 https://arxiv.org/pdf/2509.11322

Lower bounds for planar Arithmetic Circuits
Arithmetic circuits are a natural well-studied model for computing multivariate polynomials over a field. In this paper, we study planar arithmetic circuits. These are circuits whose underlying graph is planar. In particular, we prove an $Ω(n\log n)$ lower bound on the size of planar arithmetic circuits computing explicit bilinear forms on $2n$ variables. As a consequence, we get an $Ω(n\log n)$ lower bound on the size of arithmetic formulas and planar algebraic branching programs computing e…

Samsung steht vor Massenfertigung des hauseigenen Chips für das Galaxy S26
Das nächste Samsung-Tophandy S26 soll mit einem 2-Nanometer-SoC auftrumpfen. Gelingt die Produktion im eigenen Haus, wäre das ein doppelter Erfolg.

Three binary-source binary-lens microlensing events from the 2024 microlensing campaign
Cheongho Han, Chung-Uk Lee, Andrzej Udalski, Michael D. Albrow, Sun-Ju Chung, Andrew Gould, Youn Kil Jung, Kyu-Ha Hwang, Yoon-Hyun Ryu, Yossi Shvartzvald, In-Gu Shin, Jennifer C. Yee, Weicheng Zang, Hongjing Yang, Doeon Kim, Dong-Jin Kim, Byeong-Gon Park, Przemek Mr\'oz, Micha{\l} K. Szyma\'nski, Jan Skowron, Rados{\l}aw Poleski, Igor Soszy\'nski, Pawe{\l} Pietrukowicz, Szymon Koz{\l}ows…

Three binary-source binary-lens microlensing events from the 2024 microlensing campaign
We investigated microlensing events detected by the OGLE and KMTNet surveys during the 2024 observing season, focusing on those that exhibit very complex anomaly features. Through this analysis, we found that the light curves of three events including OGLE-2024-BLG-0657, KMT-2024-BLG-2017, and KMT-2024-BLG-2480 cannot be readily interpreted using standard three-body lensing models such as a binary lens with a single source (2L1S) or a single lens with a binary source (1L2S). In this work we pre…

Man, these New York Times games are hard! A computational perspective
Alessandro Giovanni Alberti, Flavio Chierichetti, Mirko Giacchini, Daniele Muscillo, Alessandro Panconesi, Erasmo Tani
https://arxiv.org/abs/2509.10846

Man, these New York Times games are hard! A computational perspective
The New York Times (NYT) games have found widespread popularity in recent years and reportedly account for an increasing fraction of the newspaper's readership. In this paper, we bring the computational lens to the study of New York Times games and consider four of them not previously studied: Letter Boxed, Pips, Strands and Tiles. We show that these games can be just as hard as they are fun. In particular, we characterize the hardness of several variants of computational problems related to th…

Olaf Lies: Erster SPD-Landeschef hält Verbrenner-Aus 2035 für unrealistisch
Der niedersächsische Landeschef will kein striktes Verbrenner-Aus für Neuwagen ab 2035, sondern auch E-Fuel, Plug-in-Hybride und E-Fahrzeuge mit Range-Extender.

Role of magnetic shear distribution on the formation of eruptive flux ropes
Samrat Sen, Sushree S Nayak, Patrick Antolin
https://arxiv.org/abs/2509.11416 https://

Role of magnetic shear distribution on the formation of eruptive flux ropes
Erupting flux ropes play crucial role in powering a wide range of solar transients, including flares, jets, and coronal mass ejections. These events are driven by the release of stored magnetic energy, facilitated by the shear in the complex magnetic topologies. However, the mechanisms governing the formation and eruption of flux ropes, particularly the role of magnetic shear distribution in coronal arcades are not fully understood. We employ magnetohydrodynamic simulations incorporating nonadi…

On Closure Properties of Read-Once Oblivious Algebraic Branching Programs
Jules Armand, Prateek Dwivedi, Magnus Rahbek Dalgaard Hansen, Nutan Limaye, Srikanth Srinivasan, S\'ebastien Tavenas
https://arxiv.org/abs/2509.10725

On Closure Properties of Read-Once Oblivious Algebraic Branching Programs
We investigate the closure properties of read-once oblivious Algebraic Branching Programs (roABPs) under various natural algebraic operations and prove the following. - Non-closure under factoring: There is a sequence of explicit polynomials $(f_n(x_1,\ldots, x_n))_n$ that have $\mathsf{poly}(n)$-sized roABPs such that some irreducible factor of $f_n$ does not have roABPs of superpolynomial size in any order. - Non-closure under powering: There is a sequence of polynomials $(f_n(x_1,\ldots,…

Wegen Handyverbots: Schulen schaffen 2-Faktor-Authentifizierung ab
81 Schulen in Oregon schalten bei den Google-Konten ihrer 44.000 Schüler die 2-Faktor-Authentifizierung ab. Denn die dürfen ja kein Handy nutzen.

Solar Eruption Onset and Particle Acceleration in Nested-Null Topologies
Pankaj Kumar, Judith T. Karpen, Peter F. Wyper, David Lario, Spiro K. Antiochos, C. Richard DeVore
https://arxiv.org/abs/2509.11326

Solar Eruption Onset and Particle Acceleration in Nested-Null Topologies
The magnetic breakout model explains a variety of solar eruptions, ranging from small-scale jets to large-scale coronal mass ejections (CMEs). Most of our previous studies are focused on jets and CMEs in single null-point topologies. Here, we investigate the initiation of CMEs and associated particle acceleration in a double null-point (or nested fan-spine) topology during multiple homologous M- and X-class flares from an active region. The initiation of the flare and associated eruption begins…

[2025-09-16 Tue (UTC), 5 new articles found for cs.CC Computational Complexity]
toXiv_bot_toot

heise | Surfen mit KI: Der neue Comet-Browser von Perplexity im Praxistest
Der Comet-Browser von Perplexity verbindet KI-Sprachmodelle mit Websites. Als Agent kann er zudem Mails beantworten, Termine organisieren oder Routen planen.

Investigating Phosphorus Abundances in a Sample of APOGEE-2 Bulge Globular Clusters
Beatriz Barbuy, Jos\'e G. Fern\'andez-Trincado, Morgan S. Camargo, Doug Geisler, Maren Brauner, Sandro Villanova, Dante Minniti, Domingo Anibal Garc\'ia-Hern\'andez, Stefano O. Souza, Heitor Ernandes, Am\^ancio Fria\c{c}a, Marco Pignatari
https://

Investigating Phosphorus Abundances in a Sample of APOGEE-2 Bulge Globular Clusters
Phosphorus enhanced (P-rich; [P/Fe] > 0.8) giants have been found among mildly metal-poor fiels stars, but in only one star in a globular cluster (GC), M4 (NGC 6121). Also, in a sample of bulge spheroid stars, some of them showed a moderate P-enhancement in the range +0.5 < [P/Fe] < +1.0. In this paper we derive the P abundance of moderately metal-poor ([Fe/H] ~-1) GC stars, aiming to check if the phenomenon could be related to the unusual multiple stellar populations found in most GCs. Here we…

Steam-Spiele tauchen jetzt in der Xbox-App auf
Die Xbox-App wird zur zentralen Anlaufstelle für alle installierten PC-Spiele: Auch Titel von Steam und aus dem Epic Games Store lassen sich starten.
https://www.

Decomposing wave activity in the solar atmosphere: Shocks, jets and swirls in the quiet Sun
George Cherry, Boris Gudiksen, Adam J. Finley, Quentin Noraz
https://arxiv.org/abs/2509.11179

Decomposing wave activity in the solar atmosphere: Shocks, jets and swirls in the quiet Sun
Context. There remains much mystery about how or if wave-energy in the photosphere can be transferred sufficiently upwards through the solar atmosphere to contribute to coronal heating. In light of a plethora of theoretical and idealised studies, we must complement our understanding with realistic and self-driven simulations in order to confidently quantify such contributions. Aims. In this study we aim to connect the various environments from the photosphere to low corona and identify wave dri…

The M- and X-class White-light Flares in Super Active Region NOAA 13664/13697 Observed by ASO-S/LST/WST
Zhichen Jing, Ying Li, Jingwei Li, Qiao Li
https://arxiv.org/abs/2509.11029

The M- and X-class White-light Flares in Super Active Region NOAA 13664/13697 Observed by ASO-S/LST/WST
Solar white-light flares (WLFs) have been observed since 1859, but their occurrence rate is not yet fully understood. The physical properties of WLFs in super active regions (SARs) are also well worth investigating. With full-disk images at 3600 Å (in the Balmer continuum) from the White-light Solar Telescope (WST) on board the Advanced Space-based Solar Observatory, we here study the M- and X-class WLFs occurring in SAR NOAA 13664/13697 (a same region in two solar Carrington rotations) during…

Statistical Analysis of Magnetic Patches in Solar Active Regions Using the Complex Network Method
Zahra Tajik, Hasan Rezaei, Mehdi Simiari, Hossien Safari
https://arxiv.org/abs/2509.10681

Statistical Analysis of Magnetic Patches in Solar Active Regions Using the Complex Network Method
Identifying solar active regions (ARs), which consist of one or more pairs of magnetic patches with opposite polarities, is essential due to their significant role in dynamic solar atmospheric phenomena. In this study, we analyze ARs during their emergence and evolution on the solar surface using a complex network-based method known as Identifying Solar Magnetic Patches (ISMP). To examine the magnetic characteristics, we selected a subregion of 125 $\times$ 125 pixels centered on AR NOAA No., 1…

A candidate to the long sought optical counterpart to the Rapid Burster in the bulge fossil fragment Liller 1
Cristina Pallanca (Dipartimento di Fisica e Astronomia "Augusto Righi", Alma Mater Studiorum Universit\`a di Bologna, Italy), Francesco R. Ferraro (Dipartimento di Fisica e Astronomia "Augusto Righi", Alma Mater Studiorum Universit\`a di Bologna, Italy), Barbara Lanzoni (Dipartimento di Fisica e Astronomia "Augusto Righi", Alma Mater Studiorum Univ…

A candidate to the long sought optical counterpart to the Rapid Burster in the bulge fossil fragment Liller 1
We report on the possible identification of the optical counterpart of the Rapid Burster MXB 1730-335 in the stellar system Liller 1. The identification was performed by taking advantage of a set of images acquired with the Hubble Space Telescope/Advanced Camera for Surveys in the optical band, and with the Gemini South Telescope in the near-infrared. The analysis of these images revealed the presence of a star with a position possibly compatible with the X-ray and radio band coordinates of the…

Central-star extinctions towards planetary nebulae
Alexander Csukai, Albert A. Zijlstra, Iain McDonald, Orsola De Marco
https://arxiv.org/abs/2509.10621 https://

Central-star extinctions towards planetary nebulae
Planetary nebulae trace the hottest and most luminous phase of evolution of solar-type stars. We use these hot, bright stars to investigate extinctions towards a complete sample of 262 confirmed PNe with large angular diameters, which have the most reliable photometry and hottest central stars. For 162 of these PNe, we identify central stars, produce spectral energy distributions from survey data using PySSED, then fit reddened model spectra to the observed photometry to obtain extinctions accu…

An Introduction to Dust Evolution and Vertical Transport in Protoplanetary Disks
Marion Villenave
https://arxiv.org/abs/2509.10614 https://arxiv.org/pdf/25…

An Introduction to Dust Evolution and Vertical Transport in Protoplanetary Disks
This tutorial is an introduction to observational studies of dust transport and evolution in protoplanetary disks. Spatially resolved observations of disks at multiple wavelengths can allow to infer the distribution of various dust grains and gas species. Combining these observations offers a more complete understanding of dust structure and properties across different disk locations. For example, by better characterizing the disk vertical structure, observations help to constrain the level of …

The HST Ultraviolet Spectrum of V723 Mon: Additional Evidence of a Stellar Companion
C. S. Kochanek (Department of Astronomy, The Ohio State University), K. Z. Stanek (Department of Astronomy, The Ohio State University), T. A. Thompson (Department of Astronomy, The Ohio State University), T. Jayasinghe (Independent Researcher)
https://arxi…

The HST Ultraviolet Spectrum of V723 Mon: Additional Evidence of a Stellar Companion
V723 Mon is a high mass function (f=1.7Msun) single lined spectroscopic binary with a red giant primary that Jayasinghe et al. (2021) suggested had a black hole as its massive companion. Unfortunately, el-Badry et al. (2022) demonstrated that it had a hotter stellar companion whose detectability in optical spectra was difficult due to its rapid rotation. Here we confirm the presence of the stellar companion with a Hubble Space Telescope STIS ultraviolet spectrum.

[2025-09-16 Tue (UTC), 18 new articles found for astro-ph.SR Solar and Stellar Astrophysics]
toXiv_bot_toot

Replaced article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Solar fusion III: New data and theory for hydrogen-burning stars
B. Acharya, et al.

Long-lived coronal loops in solar active regions
N. Vasantharaju, H. Peter, L. P. Chitta, S. Mandal
https://arxiv.org/abs/2509.13111 https://arxiv.org/pdf/…

Long-lived coronal loops in solar active regions
Coronal loops are plasma structures in the solar atmosphere with temperatures reaching millions of Kelvin, shaped and sustained by the magnetic field. However, their morphology and fundamental nature remain subjects of debate. By studying their cross-sectional properties and how they change along the loop and in time, we can understand their magnetic structure and heating mechanisms. In this study, we investigated the cross-sectional intensity profiles, both spatially and temporally, of two uni…

Solar Flare Hard X-ray Polarimetry with the CUbesat Solar Polarimeter (CUSP) mission
Nicolas De Angelis, Andrea Alimenti, Davide Albanesi, Ilaria Baffo, Daniele Brienza, Riccardo Campana, Valerio Campamaggiore, Mauro Centrone, Enrico Costa, Giovanni Cucinella, Andrea Curatolo, Giovanni De Cesare, Giulia de Iulis, Ettore Del Monte, Andrea Del Re, Sergio Di Cosimo, Simone Di Filippo, Giuseppe Di Persio, Immacolata Donnarumma, Sergio Fabiani, Pierluigi Fanelli, Nicolas Gagliardi, Abhay Ku…

Solar Flare Hard X-ray Polarimetry with the CUbesat Solar Polarimeter (CUSP) mission
The CUbesat Solar Polarimeter (CUSP) project is a CubeSat mission planned for a launch in low-Earth orbit and aimed to measure the linear polarization of solar flares in the hard X-ray band by means of a Compton scattering polarimeter. CUSP will allow us to study the magnetic reconnection and particle acceleration in the flaring magnetic structures of our star. CUSP is a project in the framework of the Alcor Program of the Italian Space Agency aimed at developing new CubeSat missions. It is und…

Binary imposters: Mergers in massive hierarchical triple stars
F. Kummer, G. Simion, S. Toonen, A. de Koter
https://arxiv.org/abs/2509.13009 https://arxiv.…

Binary imposters: Mergers in massive hierarchical triple stars
Massive stars are often born in triples, where gravitational dynamics and stellar interactions play a crucial role in shaping their evolution. One such pathway includes the merger of the inner binary, transforming the system to a binary with a distinct formation history. Therefore, the interpretation of observed binary properties and their inferred formation history may require the consideration of a potential triple origin. We aim to investigate the population of stellar mergers in massive hie…

Two unseen massive white dwarf candidates in close binaries
Yuta Shiraishi, Kenta Hotokezaka, Kento Masuda, Satoshi Honda, Ataru Tanikawa, Soetkin Janssens, Takato Tokuno, Takumi Shimasue, Ryoga Honjo, Bun'ei Sato, Masashi Omiya, Akito Tajitsu, Hideyuki Izumiura
https://arxiv.org/abs/2509.12808…

Two unseen massive white dwarf candidates in close binaries
We report the discovery of two binary systems, each consisting of a slightly bloated G-type main-sequence star and an unseen companion, identified through photometric data from TESS and radial velocity variation from Gaia. High-resolution spectroscopy confirms orbital periods of 1.37 and 2.67 days with circular orbits. The visible components have masses of $\sim 0.9\,M_\odot$, while the minimum masses of the unseen companions are $1.073^{+0.058}_{-0.060} M_\odot$ and $0.919^{+0.049}_{-0.051} M_…

Apsidal motion and proximity effects in the massive binary BD 60 497
Gregor Rauw, Piotr A. Kolaczek-Szymanski, Yael Naze, Lucas Nys
https://arxiv.org/abs/2509.12762 https://

Apsidal motion and proximity effects in the massive binary BD+60 497
The eccentric short-period O-star binary BD+60 497 is an interesting laboratory to study tidal interactions in massive binary systems, notably via the detection and characterisation of apsidal motion. The rate of apsidal motion in such systems can help us constrain their age and gain insight into the degree of mass concentration in the interior of massive stars. Spectroscopic data collected over two decades are used to reconstruct the individual spectra of the stars and to establish their epoch…

Wind Accretion in Massive Binaries Experiencing High Mass Loss Rates: I. Dependency on Mass Ratio and Orbital Period
Bhawna Mukhija, Amit Kashi
https://arxiv.org/abs/2509.12725 …

Wind Accretion in Massive Binaries Experiencing High Mass Loss Rates: I. Dependency on Mass Ratio and Orbital Period
We run numerical simulations to study high-power wind accretion in a massive binary system during a high mass loss event. The system consists of an evolved primary star with a zero age main sequence mass of $ M_{1} = \rm 100~M_{\odot}$ and a hot secondary star with a mass ranging from $ M_{2} = \rm 30-80~M_{\odot}$, orbiting in a circular orbits with periods between 455 and 1155 days. We initiate a weak eruption event with mass loss at a rate of $10^{-3}~\rm {M_{\odot}}\rm~yr^{-1}$ for 1.5 year…

TESS Light Curve Analysis: A Case Study of Stellar Rotation in TIC 445493624
Pratik Paudel, Daya Nidhi Chhatkuli, Bikash Sharma, Ashish Khanal, Nabaraj Khatri, Divash Rai
https://arxiv.org/abs/2509.12609

TESS Light Curve Analysis: A Case Study of Stellar Rotation in TIC 445493624
Stellar rotation is a fundamental parameter governing a star's magnetic activity and evolution. The Transiting Exoplanet Survey Satellite (TESS) provides high-precision photometric data ideal for measuring rotation periods via brightness modulations from starspots. This paper presents a detailed analysis of the star TIC 445493624 using 2-minute cadence data from TESS Sector 58. We process the light curve using a custom pipeline to perform outlier removal, binning, and Savitzky-Golay detrending …

TESS Subgiant and Lower Red Giant Asteroseismology in the Continuous Viewing Zones
Sophia Grusnis, Jamie Tayar, Diego Godoy-Rivera
https://arxiv.org/abs/2509.12513 https://

TESS Subgiant and Lower Red Giant Asteroseismology in the Continuous Viewing Zones
Asteroseismology, the study of stellar oscillations, and stellar modeling both offer profound insights into the fundamental properties and evolution of stars. With pySYD, a new open-source Python package, we were able to constrain the asteroseismic global parameters, $ν_{max}$ and $Δν$, for 82 solar-like oscillating subgiant and lower red giant stars, filling in the region between the Kepler dwarfs and giants. Using asteroseismic scaling relations, we were able to compute seismic masses, rad…

A high fraction of close massive binary stars at low metallicity
H. Sana, T. Shenar, J. Bodensteiner, N. Britavskiy, N. Langer, D. J. Lennon, L. Mahy, I. Mandel, S. E. de Mink, L. R. Patrick, J. I. Villasenor, M. Dirickx, M. Abdul-Masih, L. A. Almeida, F. Backs, S. R. Berlanas, M. Bernini-Peron, D. M. Bowman, V. A. Bronner, P. A. Crowther, K. Deshmukh, C. J. Evans, M. Fabry, M. Gieles, A. Gilkis, G. Gonzalez-Tora, G. Grafener, Y. Gotberg, C. Hawcroft, V. Henault-Brunet, A. Herrero, G. …

A high fraction of close massive binary stars at low metallicity
At high metallicity, a majority of massive stars have at least one close stellar companion. The evolution of such binaries is subject to strong interaction processes, heavily impacting the characteristics of their life-ending supernova and compact remnants. For the low-metallicity environments of high-redshift galaxies constraints on the multiplicity properties of massive stars over the separation range leading to binary interaction are crucially missing. Here we show that the presence of massi…

Predicting Stellar Parameters of Massive Stars from Light Curves with Machine Learning
Rachel C. Zhang, Kaze W. K. Wong, Gonzalo Holgado, Matteo Cantiello
https://arxiv.org/abs/2509.12411

Predicting Stellar Parameters of Massive Stars from Light Curves with Machine Learning
High-resolution spectroscopic measurements of OB stars are important for understanding processes like stellar evolution, but require labor-intensive observations. In contrast, photometric missions like the Transiting Exoplanet Survey Satellite (TESS) can monitor hundreds of thousands of stars with a range of temporal resolutions, but do not provide such detailed measurements. With surveys like the Legacy Survey of Space and Time promising unprecedented photometric coverage over the next ten yea…

SN 2024aecx: Double-Peaked Light Curves and Rapid Evolution in a Nearby Type IIb Supernova
Qiang Xi, Ning-Chen Sun, David Aguado, Ismael P'erez-Fournon, Fr'ed'erick Poidevin, Junjie Jin, Yiming Mao, Zexi Niu, Beichuan Wang, Yu Zhang, Kuntal Misra, Divyanshu Janghel, Justyn R. Maund, Amit Kumar, Samaporn Tinyanont, Liang-Duan Liu, Yu-Hao Zhang, Bhavya Ailawadhi, Monalisa Dubey, Zhen Guo, Anshika Gupta, Min He, Dhruv Jain, Debalina Kar, Wenxiong Li, Joe D. Lyman, Haiyang Mu, …

SN 2024aecx: Double-Peaked Light Curves and Rapid Evolution in a Nearby Type IIb Supernova
SN 2024aecx is a nearby ($\sim$11 Mpc) Type IIb SN discovered within $\sim$1 d after explosion. In this paper we report high-cadence photometric and spectroscopic follow-up observations, conducted from as early as 0.27 d post discovery out to the nebular phase at 158.4 d. We analyze the environment of SN 2024aecx and derive a new distance, metallicity and host extinction. The light curve exhibits a hot and luminous shock-cooling peak at the first few days, followed by a main peak with very rapi…

Brown Dwarf Formation Through Gravitational Collapse: Insights From 3D Numerical Simulations
Adnan Ali Ahmad, Beno\^it Commer\c{c}on, Gilles Chabrier, Antonin Borderies
https://arxiv.org/abs/2509.12336

Brown Dwarf Formation Through Gravitational Collapse: Insights From 3D Numerical Simulations
The formation mechanism of Brown Dwarfs (BDs), whether akin to stars or ejected planetary-mass objects, remains debated. We present the first 3D radiation-MHD simulations of magnetized, turbulent, gravitationally unstable low-mass cores ($0.05-0.1\ \mathrm{M_{\odot}}$) collapsing into proto-BDs. Using the {\ttfamily RAMSES} code with adaptive mesh refinement, we model the full dynamical range ($10^{5}~-10^{22}\ \mathrm{cm^{-3}}$), including radiative transfer (flux limited diffusion) and non-id…

WIYN Open Cluster Study. XCIII. An Extended Radial-Velocity Survey and Spectroscopic Binary Orbits in the Open Cluster NGC 188
Ritvik Sai Narayan, Evan Linck, Robert D. Mathieu, Aaron M. Geller
https://arxiv.org/abs/2509.12315

WIYN Open Cluster Study. XCIII. An Extended Radial-Velocity Survey and Spectroscopic Binary Orbits in the Open Cluster NGC 188
We present 32 new spectroscopic-binary orbits from our extended radial-velocity (RV) survey of the old ($6.4 \pm 0.2$ Gyr) open cluster NGC 188. Using data from the WIYN Open Cluster Study (WOCS) and APOGEE-2, this work nearly doubles the temporal baseline of the previous RV study of NGC 188. We obtain orbital solutions within a stellar sample that spans a magnitude range of $10.8 \leq \mathrm{G} \leq 16.5 \; (0.9\mbox{-}1.2 \; {M_\odot})$. With revised membership determinations using Gaia DR3 …

Zeeman Doppler Imaging of $\tau$Ceti: The Weakest Magnetic Field Detected in a Sun-like Star
Federica Chiti, Oleg Kochukhov, Jennifer L. van Saders, Travis S. Metcalfe
https://arxiv.org/abs/2509.12310 …

Zeeman Doppler Imaging of $τ$Ceti: The Weakest Magnetic Field Detected in a Sun-like Star
For nearly a decade, observations have shown that many older Sun-like stars spin faster than predicted, a phenomenon known as weakened magnetic braking (WMB). The leading hypothesis for WMB is a weakening of the large-scale dipole field, which leads to a less efficient angular momentum loss. To test this hypothesis on a star known to be in the WMB regime, we present the first Zeeman Doppler Imaging (ZDI) map of the Sun-like star $τ$Ceti, reconstructed using spectropolarimetric data from the Ca…

[2025-09-17 Wed (UTC), 14 new articles found for astro-ph.SR Solar and Stellar Astrophysics]
toXiv_bot_toot

Replaced article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Probing Solar Polar Regions
Yuanyong Deng, et al.
https://…

Crosslisted article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- SIMBA: A Python-based single-point astrochemical solver and analysis tool
Luke Keyte, Jason Ran