Hot subdwarfs in close binaries observed from space. II. Analyses of the light variations [PDF]
Astronomy & Astrophysics, 2023 Hot subdwarfs in close binaries with either M dwarf, brown dwarf or white dwarf companions show unique light variations. In hot subdwarf binaries with M dwarf or brown dwarf companions we can observe the so-called reflection effect and in hot subdwarfs ...
V. Schaffenroth +4 more
semanticscholar +1 more source
Hot subdwarfs in close binaries observed from space. I. Orbital, atmospheric, and absolute parameters and the nature of their companions [PDF]
Astronomy & Astrophysics, 2022 About a third of the hot subdwarfs of spectral type B, which are mostly core-helium burning objects on the extreme horizontal branch, are found in close binaries with cool, low-mass stellar, substellar, or white dwarf companions.
V. Schaffenroth +4 more
semanticscholar +1 more source
Chemical Properties of the Local Disk and Halo. II. Abundances of 3745 M Dwarfs and Subdwarfs from Improved Model Fitting of Low-resolution Spectra [PDF]
Astrophysical Journal, 2022 We present a model-fit pipeline to determine the stellar parameters of M-type dwarfs, which is an improvement on our previous work described in Hejazi et al.
N. Hejazi, S. Lépine, T. Nordlander
semanticscholar +1 more source
New Candidate Extreme T Subdwarfs from the Backyard Worlds: Planet 9 Citizen Science Project [PDF]
Astrophysical Journal, 2021 Schneider et al. presented the discovery of WISEA J041451.67−585456.7 and WISEA J181006.18−101000.5, which appear to be the first examples of extreme T-type subdwarfs (esdTs; metallicity ≤−1 dex, T eff ≲ 1400 K).
A. Meisner +29 more
semanticscholar +1 more source
Discovery of new TESS pulsating hot subdwarfs [PDF]
Astronomy & Astrophysics, 2022 Aims. This work is dedicated to a search for new pulsating hot subdwarfs in TESS photometric data which could have been missed in previous searches. Methods.
J. Krzesinski, L. Balona
semanticscholar +1 more source
A search for transiting planets around hot subdwarfs. II. Supplementary methods and results from TESS Cycle 1 [PDF]
Astronomy & Astrophysics, 2022 Context. Hot subdwarfs, which are hot and small He-burning objects, are ideal targets for exploring the evolution of planetary systems after the red giant branch (RGB).
A. Thuillier +5 more
semanticscholar +1 more source
An 18.9 min blue large-amplitude pulsator crossing the ‘Hertzsprung gap’ of hot subdwarfs [PDF]
Nature Astronomy, 2022 Blue large-amplitude pulsators (BLAPs) represent a mysterious class of hot stars pulsating in an unexpectedly extreme way. Here we report the discovery of an unusual BLAP at a short-lived phase that provides a new path to understand their physical ...
Jie Lin +30 more
semanticscholar +1 more source
A search for transiting planets around hot subdwarfs [PDF]
Astronomy & Astrophysics, 2021 Context. Hot subdwarfs experienced strong mass loss on the red giant branch (RGB) and are now hot and small He-burning objects. These stars constitute excellent opportunities for addressing the question of the evolution of exoplanetary systems directly ...
V. Van Grootel +81 more
semanticscholar +1 more source
A Grid of Synthetic Spectra for Subdwarfs: Non-LTE Line-blanketed Atmosphere Models [PDF]
Astrophysical Journal Supplement Series, 2021 A new grid of detailed atmosphere model spectra for hot and moderately cool subdwarf stars is presented. High-resolution spectra and synthetic photometry are calculated in the range from 1000–10,000 Å using non-LTE fully line-blanketed atmosphere ...
T. A. Pacheco +3 more
semanticscholar +1 more source
A transit survey to search for planets around hot subdwarfs
Bulletin de la Société royale des sciences de Liège, 2023 Hot subdwarf stars are small post-red-giant-branch stars. To this day, no planets have been confirmed around them. In this document we present the first results of our analysis to quantify the presence of planets around hot subdwarfs by performing a wide
A. Thuillier +5 more
semanticscholar +1 more source