The runaway velocity of the white dwarf companion in the double detonation scenario of supernovae

Abstract

We consider the finite velocity of the ejecta of a type Ia supernova (SN Ia) in the double detonation (DDet) scenario with a white dwarf (WD) mass-donor companion, and find that the runaway velocity of the surviving (mass donor) WD is lower than its pre-explosion orbital velocity by about 8-11%. This implies that the fastest runaway WDs in the Galaxy, if come from the DDet scenario, require even more massive WDs than what a simple calculation that neglects the finite ejecta velocity gives. This extreme set of initial conditions makes such binaries less common. We also tentatively find that the inner ejecta deviates from spherical symmetry, but not to the degree that we can use observations to make any claim. Our findings support the claim that the DDet scenario leads mostly to peculiar SNe Ia but not to normal SNe Ia.

Accepted for publication in The Open Journal Of Astrophysics

References in corpus (13)

• Masses of White Dwarf Binary Companions to Type Ia Supernovae Measured from Runaway Velocities
• Hyper-runaway and hypervelocity white dwarf candidates in \textit{Gaia} Data Release 3: possible remnants from Ia/Iax supernova explosions or dynamical encounters
• Normal type Ia supernovae from disruptions of hybrid He-CO white-dwarfs by CO white-dwarfs
• SN 2022joj: A Potential Double Detonation with a Thin Helium shell
• From an amateur PN candidate to the Rosetta Stone of SN Iax research
• Flight of the Bumblebee: the Early Excess Flux of Type Ia Supernova 2023bee revealed by $TESS$, $Swift$ and Young Supernova Experiment Observations
• SN 2022oqm: A Bright and Multi-peaked Calcium-rich Transient
• Sensitivity of Simulations of Double Detonation Type Ia Supernova to Integration Methodology
• Newly Formed Dust within the Circumstellar Environment of SNIa-CSM 2018evt
• An Asymmetric Double-Degenerate Type Ia Supernova Explosion with a Surviving Companion Star
• The Local Group Symbiotic Star Population and its Weak Relation with Type Ia Supernovae
• Exploring the circumstellar environment of Tycho's supernova remnant--I. The hydrodynamic evolution of the shock
• Faint calcium-rich transient from the double-detonation of a $0.6M_{\odot }$ carbon-oxygen white dwarf star

Cited by in corpus (3)

• Evolution of binaries containing a hot subdwarf and a white dwarf to double white dwarfs, and double detonation supernovae with hypervelocity runaway stars
• Merging White Dwarf Binaries Produce Type Ia Supernovae in Elliptical Galaxies
• Violent mergers revisited: The origin of the fastest stars in the Galaxy