TY - JOUR
T1 - Supernovae Ia in 2019 (review)
T2 - A rising demand for spherical explosions
AU - Soker, Noam
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2019/12
Y1 - 2019/12
N2 - I review new studies of type Ia supernovae (SNe Ia) from 2019, and use these to improve the comparison between the five binary SN Ia scenarios. New low polarisation measurements solidify the claim that most SN Ia explosions are globally spherically symmetric (clumps are possible). Explosions by dynamical processes, like explosions that take place during a merger process of two white dwarfs (WDs) in the double degenerate (DD) scenario, or during an accretion process in the double detonation (DDet) scenario and in the single degenerate (SD) scenario, lead to non-spherical explosions, in contradiction with observations of normal SNe Ia. I argue that these (DD, DDet, SD) scenarios account mainly for peculiar SNe Ia. The explosion of a Chandrasekhar mass (MCH) WD (deflagration to detonation process) has a global spherical structure that is compatible with observations. To reach spherical explosions, SN Ia scenarios should allow for a time delay between the formation of an MCh-WD and its explosion. As such, I split the DD scenario to a channel without merger to explosion delay (MED) time (that forms mainly peculiar SNe Ia), and a channel with a MED, the DD-MED channel (scenario). I speculate that the main contributors to normal SNe Ia are the core degenerate (CD) scenario, the DD-MED scenario, both have MCH spherical explosions, and the DD scenario that has sub-CCH non-spherical explosions.
AB - I review new studies of type Ia supernovae (SNe Ia) from 2019, and use these to improve the comparison between the five binary SN Ia scenarios. New low polarisation measurements solidify the claim that most SN Ia explosions are globally spherically symmetric (clumps are possible). Explosions by dynamical processes, like explosions that take place during a merger process of two white dwarfs (WDs) in the double degenerate (DD) scenario, or during an accretion process in the double detonation (DDet) scenario and in the single degenerate (SD) scenario, lead to non-spherical explosions, in contradiction with observations of normal SNe Ia. I argue that these (DD, DDet, SD) scenarios account mainly for peculiar SNe Ia. The explosion of a Chandrasekhar mass (MCH) WD (deflagration to detonation process) has a global spherical structure that is compatible with observations. To reach spherical explosions, SN Ia scenarios should allow for a time delay between the formation of an MCh-WD and its explosion. As such, I split the DD scenario to a channel without merger to explosion delay (MED) time (that forms mainly peculiar SNe Ia), and a channel with a MED, the DD-MED channel (scenario). I speculate that the main contributors to normal SNe Ia are the core degenerate (CD) scenario, the DD-MED scenario, both have MCH spherical explosions, and the DD scenario that has sub-CCH non-spherical explosions.
KW - Astrophysics - High energy astrophysical phenomena
KW - Astrophysics - Solar and stellar astrophysics
KW - Binaries: Close
KW - Supernovae: General
KW - White dwarfs
UR - http://www.scopus.com/inward/record.url?scp=85085298981&partnerID=8YFLogxK
U2 - 10.1016/j.newar.2020.101535
DO - 10.1016/j.newar.2020.101535
M3 - 文献综述
AN - SCOPUS:85085298981
VL - 87
JO - New Astronomy Reviews
JF - New Astronomy Reviews
SN - 1387-6473
M1 - 101535
ER -