An unusual white dwarf star may be a surviving remnant of a subluminous Type Ia supernova

0481069 - ASÚ 2018 RIV US eng J - Článek v odborném periodiku
Vennes, Stephane - Németh, P. - Kawka, Adela - Thorstensen, J.R. - Khalack, V. - Ferrario, L. - Alper, E.H.
An unusual white dwarf star may be a surviving remnant of a subluminous Type Ia supernova.
Science. Roč. 357, č. 6352 (2017), s. 680-683. ISSN 0036-8075. E-ISSN 1095-9203
Grant CEP: GA ČR GA15-15943S
Institucionální podpora: RVO:67985815
Klíčová slova: evolution * model * hypervelocity
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 41.058, rok: 2017

Subluminous Type Ia supernovae, such as the Type Iax-class prototype SN 2002cx, are described by a variety of models such as the failed detonation and partial deflagration of an accreting carbon-oxygen white dwarf star or the explosion of an accreting, hybrid carbon-oxygen-neon core. These models predict that bound remnants survive such events with, according to some simulations, a high kick velocity. We report the discovery of a high proper motion, low-mass white dwarf (LP 40-365) that travels at a velocity greater than the Galactic escape velocity and whose peculiar atmosphere is dominated by intermediate-mass elements. Strong evidence indicates that this partially burnt remnant was ejected following a subluminous Type Ia supernova event. This supports the viability of single-degenerate supernova progenitors.
Trvalý link: http://hdl.handle.net/11104/0276680