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19912026
Showing 2025 · astro-ph.SRShow all

8 papers · 2 filters

astro-ph.SR2025★ 2 cited

The Binary Fraction of Stars in the Dwarf Galaxy Ursa Minor via Dark Energy Spectroscopic Instrument

Tian Qiu, Wenting Wang, Sergey Koposov +45

We utilize multi-epoch line-of-sight velocity measurements from the Milky Way Survey of the Dark Energy Spectroscopic Instrument to estimate the binary fraction for member stars in…

astro-ph.SR2025

An extremely fast fading population II dwarf nova candidate: caught spectroscopically on the rise

Natasha Van Bemmel, Jielai Zhang, Jeff Cooke +14

We present AT2022kak, a rapidly evolving optical transient discovered by the KiloNova and Transients Program (KNTraP). This interesting burst exhibited extremely fast evolution, wi…

astro-ph.SR2025★ 4 cited

An axisymmetric shock breakout indicated by prompt polarized emission from the type II supernova 2024ggi

Yi Yang, Xudong Wen, Lifan Wang +18

The death of massive stars is triggered by an infall-induced bounce shock that disrupts the star. How such a shock is launched and propagates through the star is a decade-long puzz…

astro-ph.SR2025★ 3 cited

Conversion and Damping of Nonaxisymmetric Internal Gravity Waves in Magnetized Stellar Cores

Cy S. David, Daniel Lecoanet, Pascale Garaud

Magnetism is thought to play an important role in the evolution and dynamics of stars, though little is known about magnetic fields deep within stellar interiors. A promising avenu…

astro-ph.SR2025

Diversity of Cold Worlds: Predicted Near- to Mid-infrared Spectral Signatures of a Cold Brown Dwarf with Potential Auroral Heating

Genaro Suárez, Jacqueline K. Faherty, Ben Burningham +12

Recent JWST/NIRSpec observations have revealed strong methane emission at 3.326 microns in the 482 K brown dwarf CWISEP J193518.59154620.3 (W1935). Atmospheric modeling…

astro-ph.SR2025★ 1 cited

Apache Point Observatory follow-up of ACcelerating Candidate ExopLanet host Stars (APO ACCELS): Ages for 166 Accelerating Stars in the Northern Hemisphere

Anne E. Peck, Eric L. Nielsen, Robert J. De Rosa +14

Directly imaged substellar companions with well-constrained ages and masses serve as vital empirical benchmarks for planet formation and evolution models. Potential benchmark compa…

astro-ph.SR2025★ 2 cited

A 1.48-2.48 m R=28000 spectroscopic atlas of the L7.5 and T0.5 components of the nearest pair of brown dwarfs: Luhman 16AB

Hiroyuki Tako Ishikawa, Stanimir Metchev, Megan E. Tannock +6

We present a high signal-to-noise (SNR 450), high-dispersion () H- and K-band spectroscopic atlas of the L7.5 and T0.5 components of the Luhman 1…

astro-ph.SR2025

Carbon Stars From Gaia DR3 and the Space Density of Dwarf Carbon Stars

Benjamin R. Roulston, Naunet Leonhardes-Barboza, Paul J. Green +1

Carbon stars (with atmospheric C/O) range widely in temperature and luminosity, from low mass dwarfs to asymptotic giant branch stars (AGB). The main sequence dwarf carbon (dC)…