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astro-ph.SR2026

Chemical fingerprints of binary mass transfer in massive stars

Harim Jin, Norbert Langer

The majority of massive stars are born in close binary systems. As stars expand when they age, mass transfer or even a merger with their companion is inevitable. However, most bina…

astro-ph.SR2026

Euclid: The convective-transition gap of 47 Tuc

M. Libralato, M. Griggio, R. Gerasimov +140

We report the first detection of the `convective-transition gap' (also known as `M-dwarf gap') in the globular cluster 47 Tuc (NGC 104) thanks to Euclid data. This feature, linked…

astro-ph.SR2026

Binarity at LOw Metallicity (BLOeM): massive star variability revealed using a novel software tool for point-spread function fitting of TESS images

Pieterjan J. Van Daele, Dominic M. Bowman, Roey Ovadia +12

Massive stars, the progenitors of neutron stars and black holes, play a crucial role in shaping the chemical and radiative properties of entire galaxies through their winds and exp…

astro-ph.SR2026★ 3 cited

Intermediate-Mass Mergers: A New Scenario for Several FS CMa Stars

Daniela Korcakova, Nela Dvorakova, Iris Bermejo Lozano +6

We summarise the properties and nature of a peculiar group of B-type stars called FS CMa stars. These stars show the B[e] phenomenon, i.e., their spectra exhibit both forbidden emi…

astro-ph.SR2026★ 5 cited

Binarity at LOw Metallicity (BLOeM): Projected rotational velocities

D. J. Lennon, S. R. Berlanas, A. Herrero +36

The Binarity at LOw Metallicity (BLOeM) survey is an ESO large programme designed to obtain multi-epoch spectroscopy for 929 massive stars in the Small Magellanic Cloud (SMC). It w…

astro-ph.SR2026★ 1 cited

Gaia20fnr: A binary-lens microlensing event with full orbital motion revealed by four space telescopes

M. Wicker, Ł. Wyrzykowski, M. Hundertmark +49

The microlensing event Gaia20fnr is a long-duration, non-caustic-crossing binary-lens event at high Galactic latitude. Triggered by a photometric rise detected by the Gaia space mi…

astro-ph.SR2026★ 4 cited

Thermal-timescale accretion does not always yield critical rotation in mass gainers

Chen Wang, Mike Y. M. Lau, Xiang-Dong Li +7

Binary evolution plays a central role in producing rapidly rotating stars. Previous studies have shown that mass gainers in binaries can reach critical rotation after accreting onl…

astro-ph.SR2025

The EBLM Project XVIII. 3D Obliquities of Five Low-Mass Eclipsing Binaries

Becca Spejcher, David V. Martin, Jake Pandina +17

The formation of tight stellar binaries remains an unsolved problem. There is too much angular momentum in a collapsing and fragmenting protostellar cloud to form a stellar binary…

astro-ph.SR2025★ 5 cited

Interacting binaries on the Main Sequence as in-situ tracers of mass transfer efficiency and stability

Koushik Sen, Mathieu Renzo, Harim Jin +8

Understanding the transfer of mass and angular momentum in binary interactions is crucial for modelling the evolution of any interacting binary after the first mass transfer phase.…

astro-ph.SR2025★ 6 cited

Recent progress on interstellar radionuclides on Earth and the Moon

Dominik Koll, Sebastian Fichter, Michael Hotchkis +7

The detection of interstellar radionuclides in geological archives provides insights into nucleosynthesis in stars and stellar explosions as well as interstellar medium dynamics in…

astro-ph.SR2025★ 3 cited

A constant upper luminosity limit of cool supergiant stars down to the extremely low metallicity of I Zw 18

Abel Schootemeijer, Ylva Götberg, Norbert Langer +3

Stellar wind mass loss is often assumed to depend on their metallicity . Therefore, evolutionary models of massive stars at lower are able to retain more of their H-rich lay…

astro-ph.SR2025★ 22 cited

A high fraction of close massive binary stars at low metallicity

H. Sana, T. Shenar, J. Bodensteiner +74

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 impac…

astro-ph.SR2025★ 3 cited

Evolutionary models for the Very Massive Stars in the R136 cluster of 30 Doradus in the Large Magellanic Cloud

Z. Keszthelyi, S. A. Brands, A. de Koter +2

The cluster R136 in the LMC contains a population of stars in excess of 100 M, including R136a1, the most massive star known. Very Massive Stars (VMSs) play an influential…

astro-ph.SR2025★ 11 cited

Populations of evolved massive binary stars in the Small Magellanic Cloud II: Predictions from rapid binary evolution

C. Schürmann, X. -T. Xu, N. Langer +10

Massive star evolution plays a crucial role in astrophysics but bares large uncertainties. This problem becomes more severe by the majority of massive stars being born in close bin…

astro-ph.SR2025

Euclid: Quick Data Release (Q1) -- Ultracool dwarfs in the Euclid Deep Fields

A. Mohandasan, R. L. Smart, C. Reylé +180

Ultracool dwarfs (UCDs) encompass the lowest-mass stars and brown dwarfs at the substellar boundary. These intrinsically faint objects are challenging to detect, but the wide cover…

astro-ph.SR2025★ 14 cited

Populations of evolved massive binary stars in the Small Magellanic Cloud I: Predictions from detailed evolution models

X. -T. Xu, C. Schürmann, N. Langer +13

Context. The majority of massive stars are born with a close binary companion. How this affects their evolution and fate is still largely uncertain, especially at low metallicity.…

astro-ph.SR2025★ 1 cited

Euclid: Quick Data Release (Q1) -- A photometric search for ultracool dwarfs in the Euclid Deep Fields

M. Žerjal, C. Dominguez-Tagle, N. Vitas +178

We present a catalogue of 5306 new ultracool dwarf (UCD) candidates in the three Euclid Deep Fields in the Q1 data release. They range from late M to late T dwarfs, and include 120…

astro-ph.SR2024★ 2 cited

Red supergiant stars in binary systems II. Confirmation of B-type companions of red supergiants in the Small Magellanic Cloud using Hubble ultra-violet spectroscopy

L. R. Patrick, D. J. Lennon, A. Schootemeijer +5

Red supergiant stars (RSGs) represent the final evolutionary phase of the majority of massive stars and hold a unique role in testing the physics of stellar models. Eighty eight RS…

astro-ph.SR2024★ 1 cited

On the detectability and parameterisation of binary stars through spectral energy distributions

Vikrant V. Jadhav

This study examines the characterization of binary star systems using Spectral Energy Distributions (SEDs), a technique increasingly essential with the rise of large-scale astronom…

astro-ph.SR2024★ 1 cited

Euclid: High-precision imaging astrometry and photometry from Early Release Observations. I. Internal kinematics of NGC 6397 by combining Euclid and Gaia data

M. Libralato, L. R. Bedin, M. Griggio +175

The instruments at the focus of the Euclid space observatory offer superb, diffraction-limited imaging over an unprecedented (from space) wide field of view of 0.57 deg. This e…

astro-ph.SR2024★ 4 cited

Standing torsional Alfvén waves as the source of the rotational period variation in magnetic early-type stars

Koh Takahashi, Norbert Langer

Context. The influence of magnetic fields on stellar evolution remains unresolved. It has been proposed that if there is a large-scale magnetic field in the stellar interior, torsi…

astro-ph.SR2024★ 11 cited

Modeling contact binaries, III. Properties of a population of close, massive binaries

Matthias Fabry, Pablo Marchant, Norbert Langer +1

Among massive stars, binary interaction is the rule rather than the exception. The closest binaries, those with periods of less than about 10 days, undergo mass transfer during cor…

astro-ph.SR2024★ 37 cited

Binarity at LOw Metallicity (BLOeM): a spectroscopic VLT monitoring survey of massive stars in the SMC

T. Shenar, J. Bodensteiner, H. Sana +74

Surveys in the Milky Way and Large Magellanic Cloud revealed that the majority of massive stars will interact with companions during their lives. However, knowledge of the binary p…

astro-ph.SR2024★ 10 cited

UOCS. XIV. Uncovering extremely low mass white dwarfs and blue lurkers in NGC 752

Vikrant V. Jadhav, Annapurni Subramaniam, Ram Sagar

Evolutionary pathways of binary systems are vastly different from single stellar evolution, and thus, there is a need to quantify their frequency and diversity. Open clusters are t…