Hot subdwarf stars and their connection to thermonuclear supernovae

11th Pacific Rim Conference on Stellar Astrophysics: Physics and Chemistry of the Late Stages of Stellar Evolution

物理学;天文学

Geier, S.^1,2 ; Kupfer, T.^3 ; Ziegerer, E.^2 ; Heber, U.^2 ; Németh, P.^2 ; Irrgang, A.^2

Department of Physics, University of Warwick, Coventry

CV4 7AL, United Kingdom^1

Dr. Karl Remeis-Observatory and ECAP, Astronomical Institute, Friedrich-Alexander University Erlangen-Nuremberg, Sternwartstr. 7, Bamberg

D 96049, Germany^2

Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena

CA

91125, United States^3

关键词: All-sky;    Cross-matching;    Gaia mission;    Helium-burning;    Light curves;    Proper motion;    Subdwarf stars;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/728/7/072017/pdf
DOI  :  10.1088/1742-6596/728/7/072017

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Hot subdwarf stars (sdO/Bs) are evolved core helium-burning stars with very thin hydrogen envelopes, which can be formed by common envelope ejection. Close sdB binaries with massive white dwarf (WD) companions are potential progenitors of thermonuclear supernovae type Ia (SN Ia). We discovered such a progenitor candidate as well as a candidate for a surviving companion star, which escapes from the Galaxy. More candidates for both types of objects have been found by crossmatching known sdB stars with proper motion and light curve catalogues. The Gaia mission will provide accurate astrometry and light curves of all the stars in our hot subdwarf sample and will allow us to compile a much larger all-sky catalogue of those stars. In this way we expect to find hundreds of progenitor binaries and ejected companions.