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

We have computed a 3D 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, producin...

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Bibliographic Details
Main Authors: Morán Fraile, Javier (Author) , Holas, Alexander (Author) , Röpke, Friedrich (Author) , Pakmor, Rüdiger (Author) , Schneider, Fabian (Author)
Format: Article (Journal)
Language:English
Published: 04 March 2024
In: Astronomy and astrophysics
Year: 2024, Volume: 683, Pages: 1-7
ISSN:1432-0746
DOI:10.1051/0004-6361/202347769
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1051/0004-6361/202347769
Verlag, lizenzpflichtig, Volltext: https://www.aanda.org/articles/aa/abs/2024/03/aa47769-23/aa47769-23.html
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Author Notes:Javier Morán-Fraile, Alexander Holas, Friedrich K. Röpke, Rüdiger Pakmor, and Fabian R.N. Schneider
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Summary:We have computed a 3D 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 during the first few weeks after the explosion. The explosion only yields <0.01 M of 56Ni, resulting in a low-luminosity Type Ia supernova-like light curve that resembles the Ca-rich transients within this broad class of objects, with a peak magnitude of Mbol ≈ −15.7 mag and a rather slow decline rate of ∆mbol 15 ≈ 1.5 mag. Both its light curve shape and spectral appearance resemble the appearance of Ca-rich transients, suggesting such mergers as a possible progenitor scenario for this class of events.
Item Description:Im Titel ist M[symbol sun] als Abkürzung für die astronomische Maßeinheit Sonnenmasse dargestellt
Im Text ist "⊙" tiefgestellt
Gesehen am 09.09.2024
Physical Description:Online Resource
ISSN:1432-0746
DOI:10.1051/0004-6361/202347769

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