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3D Hydrodynamical S...
3D Hydrodynamical Simulations of Helium-ignited Double-degenerate White Dwarf Mergers
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- Roy, Niranjan C. (author)
- University of Connecticut,University of Massachusetts Dartmouth
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- Tiwari, Vishal (author)
- Georgia Institute of Technology,University of Massachusetts Dartmouth
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- Bobrick, Alexey (author)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science,Technion - Israel Institute of Technology
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- Kosakowski, Daniel (author)
- University of Massachusetts Dartmouth
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- Fisher, Robert (author)
- University of Massachusetts Dartmouth
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- Perets, Hagai B. (author)
- Technion - Israel Institute of Technology
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- Kashyap, Rahul (author)
- Pennsylvania State University
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- Lorén-Aguilar, Pablo (author)
- University of Exeter
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- García-Berro, Enrique (author)
- Polytechnic University of Catalonia
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(creator_code:org_t)
- 2022-06-21
- 2022
- English.
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In: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8205 .- 2041-8213. ; 932:2
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Abstract
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- The origins of Type Ia supernovae (SNe Ia) are still debated. Some of the leading scenarios involve a double detonation in double white dwarf (WD) systems. In these scenarios, helium shell detonation occurs on top of a carbon-oxygen (CO) WD, which then drives the detonation of the CO core, producing an SN Ia. Extensive studies have been done on the possibility of a double helium detonation, following a dynamical helium mass-transfer phase onto a CO-WD. However, 3D self-consistent modeling of the double-WD system, the mass transfer, and the helium shell detonation have been little studied. Here we use 3D hydrodynamical simulations to explore this case in which a helium detonation occurs near the point of Roche lobe overflow of the donor WD and may lead to an SN Ia through the dynamically driven double-degenerate double-detonation (D6) mechanism. We find that the helium layer of the accreting primary WD does undergo a detonation, while the underlying CO core does not, leading to an extremely rapid and faint nova-like transient instead of a luminous SN Ia event. This failed core detonation suggests that D6 SNe Ia may be restricted to the most massive CO primary WDs. We highlight the nucleosynthesis of the long-lived radioisotope 44Ti during explosive helium burning, which may serve as a hallmark both of successful as well as failed D6 events, which subsequently detonate as classical double-degenerate mergers.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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