Double-detonation Models for Type Ia Supernovae: Trigger of Detonation in Companion White Dwarfs and Signatures of Companions’ Stripped-off Materials
- 5 November 2019
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 885 (2), 103
- https://doi.org/10.3847/1538-4357/ab46b6
Abstract
We have studied double-detonation explosions in double-degenerate (DD) systems with different companion white dwarfs (WDs) for modeling Type Ia supernovae (SNe Ia) by means of high-resolution smoothed particle hydrodynamics (SPH) simulations. We have found that only the primary WDs explode in some of the DD systems, while the explosions of the primary WDs induce the explosions of the companion WDs in the other DD systems. The former case is a so-called dynamically-driven double-degenerate double-detonation (D-6) explosion, or helium-ignited violent merger explosion. The SN ejecta of the primary WDs strip materials from the companion WDs, whose mass is ?10(?3) M. The stripped materials contain carbon and oxygen when the companion WDs are carbon?oxygen (CO) WDs with He shells ?0.04 M. Since they contribute to low-velocity ejecta components as observationally inferred for iPTF14atg, D-6 explosions can be counterparts of subluminous SNeIa. The stripped materials may contribute to low-velocity C seen in several SNeIa. In the latter case, the companion WDs explode through He detonation if they are HeWDs and through the double-detonation mechanism if they are COWDs with He shells. We name these explosions ?triple? and ?quadruple? detonation (TD/QD) explosions after the number of detonations. The QD explosion may be counterparts of luminous SNeIa, such as SN1991T and SN1999aa, since they yield a large amount of Ni-56, and their He-detonation products contribute to the early emissions accompanying such luminous SNeIa. On the other hand, the TD explosion may not yield a sufficient amount of Ni-56 to explain luminous SNeIa.Funding Information
- The Japan Society for the Promotion of Science (19K03907)
- The Japan Society for the Promotion of Science (17H06360)
- The Japan Society for the Promotion of Science (17K05382)
- The Japan Society for the Promotion of Science (16K17656)
This publication has 95 references indexed in Scilit:
- ZTF 18aaqeasu (SN2018byg): A Massive Helium-shell Double Detonation on a Sub-Chandrasekhar-mass White DwarfThe Astrophysical Journal Letters, 2019
- A significantly off-centre 56Ni distribution for the low-luminosity type Ia supernova SN 2016brx from the 100IAS surveyMonthly Notices of the Royal Astronomical Society: Letters, 2018
- Constraining the Single-degenerate Channel of Type Ia Supernovae with Stable Iron-group Elements in SNR 3C 397The Astrophysical Journal, 2017
- FINAL EVOLUTION AND DELAYED EXPLOSIONS OF SPINNING WHITE DWARFS IN SINGLE DEGENERATE MODELS FOR TYPE Ia SUPERNOVAEThe Astrophysical Journal Letters, 2015
- PERSISTENT C II ABSORPTION IN THE NORMAL TYPE Ia SUPERNOVA 2002fkThe Astrophysical Journal, 2014
- PTF 11kx: A Type Ia Supernova with a Symbiotic Nova ProgenitorScience, 2012
- Improving convergence in smoothed particle hydrodynamics simulations without pairing instabilityMonthly Notices of the Royal Astronomical Society, 2012
- SPIN-UP/SPIN-DOWN MODELS FOR TYPE Ia SUPERNOVAEThe Astrophysical Journal Letters, 2011
- Improved Calculations of the Equilibrium Abundances of Heavy Elements Supported by Radiative Levitation in the Atmospheres of Hot DA White DwarfsThe Astrophysical Journal, 1995
- Radiative Levitation in Hot White Dwarfs: Equilibrium TheoryThe Astrophysical Journal Supplement Series, 1995