Faint calcium-rich transient from a double detonation of a 0.6 M⊙ carbon-oxygen white dwarf star


We have computed a three-dimensional hydrodynamic simulation of the merger between a massive (0.4 M_⊙) helium white dwarf (He WD) and a low-mass (0.6 M_⊙) carbon-oxygen white dwarf (CO WD). Despite the low mass of the primary, the merger triggers a thermonuclear explosion as a result of a double detonation, producing a faint transient and leaving no remnant behind. This type of event could also take place during common-envelope mergers whenever the companion is a CO WD and the core of the giant star has a sufficiently large He mass. The spectra show strong Ca lines throughout the first few weeks after the explosion. The explosion only yields <0.01 M_⊙of ^56Ni, resulting in a low-luminosity SN Ia-like lightcurve that resembles the Ca-rich transients within this broad class of objects, with a peak magnitude of M_\mathrmbol ≈-15.7 mag and a rather slow decline rate of ∆m_15^\mathrmbol≈1.5 mag. Both, its lightcurve-shape and spectral appearance, resemble the appearance of Ca-rich transients, suggesting such mergers as a possible progenitor scenario for this class of events.

SEEK ID: https://publications.h-its.org/publications/1739

DOI: 10.1051/0004-6361/202347769

Research Groups: Physics of Stellar Objects

Publication type: Journal

Journal: Astronomy &amp; Astrophysics

Publisher: EDP Sciences

Citation: Astronomy and Astrophysics

Date Published: 4th Mar 2024

URL: http://arxiv.org/abs/2310.19669 https://www.aanda.org/articles/aa/full_html/2024/03/aa47769-23/aa47769-23.html

Registered Mode: imported from a bibtex file

Morán-Fraile, J., Holas, A., Röpke, F. K., Pakmor, R., & Schneider, F. R. N. (2024). Faint calcium-rich transient from a double detonation of a 0.6 M carbon-oxygen white dwarf star. In Astronomy & Astrophysics (Vol. 683, p. A44). EDP Sciences. https://doi.org/10.1051/0004-6361/202347769

Views: 839

Created: 4th Dec 2023 at 09:32

Last updated: 12th Mar 2024 at 11:54

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