Query : 2017A&A...606A.136L

2017A&A...606A.136L - Astronomy and Astrophysics, volume 606A, 136-136 (2017/10-1)

Merging of a CO WD and a He-rich WD to produce a type Ia supernovae.

LIU D., WANG B., WU C. and HAN Z.

Abstract (from CDS):

Context. Although type Ia supernovae (SNe Ia) play a key role in astrophysics, the companions of the exploding carbon-oxygen white dwarfs (CO WDs) are still not completely identified. It has been suggested recently that a He-rich WD (a He WD or a hybrid HeCO WD) that merges with a CO WD may produce an SN Ia. This theory was based on the double-detonation model, in which the shock compression in the CO core caused by the surface explosion of the He-rich shell might lead to the explosion of the whole CO WD. However, so far, very few binary population synthesis (BPS) studies have been made on the merger scenario of a CO WD and a He-rich WD in the context of SNe Ia.
Aims. We aim to systematically study the Galactic birthrates and delay-time distributions of SNe Ia based on the merger scenario of a CO WD and a He-rich WD.
Methods. We performed a series of Monte Carlo BPS simulations to investigate the properties of SNe Ia from the merging of a CO WD and a He-rich WD based on the Hurley rapid binary evolution code. We also considered the influence of different metallicities on the final results.
Results. From our simulations, we found that no more than 15% of all SNe Ia stem from the merger scenario of a CO WD and a He-rich WD, and their delay times range from ∼110Myr to the Hubble time. This scenario mainly contributes to SN Ia explosions with intermediate and long delay times. The present work indicates that the merger scenario of a CO WD and a He-rich WD can roughly reproduce the birthrates of SN 1991bg-like events, and cover the range of their delay times. We also found that SN Ia birthrates from this scenario would be higher for the cases with low metallicities.

Abstract Copyright: © ESO, 2017

Journal keyword(s): binaries: close - stars: evolution - supernovae: general - supernovae: general

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 SN 1572A SN* 00 25 21.5 +64 08 27           B8 1176 1
2 SBSS 1150+599 PN 11 53 24.7392231288 +59 39 57.050391708   17.5       O(H)III-V 67 0
3 CD-30 11223 HS* 14 11 16.1541452856 -30 53 03.700889340   12.101 12.296 12.659 12.541 sdB+DA 67 0
4 KPD 1930+2752 HS* 19 32 14.8088063952 +27 58 35.445679608 12.80 13.75 13.82     sdB 158 0
5 V* V458 Vul PN 19 54 24.6304743344 +20 52 52.134341488   17.76 15.96 17.9   ~ 122 0

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