English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  SNe Ia from double detonations: Impact of core-shell mixing on the carbon ignition mechanism

Gronow, S., Collins, C., Ohlmann, S. T., Pakmor, R., Kromer, M., Seitenzahl, I. R., et al. (2020). SNe Ia from double detonations: Impact of core-shell mixing on the carbon ignition mechanism. Astronomy and Astrophysics, 635: A169. doi:10.1051/0004-6361/201936494.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0006-85D4-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-85D5-3
Genre: Journal Article

Files

show Files
hide Files
:
SNe Ia from double detonations Impact of core-shell mixing on the carbon ignition mechanism.pdf (Any fulltext), 6MB
 
File Permalink:
-
Name:
SNe Ia from double detonations Impact of core-shell mixing on the carbon ignition mechanism.pdf
Description:
-
Visibility:
Private
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Gronow, Sabrina, Author
Collins, Christine, Author
Ohlmann, Sebastian T., Author
Pakmor, Rüdiger1, Author              
Kromer, Markus, Author
Seitenzahl, Ivo R., Author
Sim, Stuart A., Author
Röpke, Friedrich K., Author
Affiliations:
1Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              

Content

show
hide
Free keywords: -
 Abstract: Sub-Chandrasekhar mass white dwarfs accreting a helium shell on a carbon-oxygen core are potential progenitors of normal Type Ia supernovae. This work focuses on the details of the onset of the carbon detonation in the double detonation sub-Chandrasekhar model. In order to simulate the influence of core-shell mixing on the carbon ignition mechanism, the helium shell and its detonation are followed with an increased resolution compared to the rest of the star treating the propagation of the detonation wave more accurately. This significantly improves the predictions of the nucleosynthetic yields from the helium burning. The simulations were carried out with the AREPO code. A carbon-oxygen core with a helium shell was set up in one dimension and mapped to three dimensions. We ensured the stability of the white dwarf with a relaxation step before the hydrodynamic detonation simulation started. Synthetic observables were calculated with the radiative transfer code ARTIS. An ignition mechanism of the carbon detonation was observed, which received little attention before. In this “scissors mechanism”, the impact the helium detonation wave has on unburnt material when converging opposite to its ignition spot is strong enough to ignite a carbon detonation. This is possible in a carbon enriched transition region between the core and shell. The detonation mechanism is found to be sensitive to details of the core-shell transition and our models illustrate the need to consider core-shell mixing taking place during the accretion process. Even though the detonation ignition mechanism differs form the converging shock mechanism, the differences in the synthetic observables are not significant. Though they do not fit observations better than previous simulations, they illustrate the need for multi-dimensional simulations.

Details

show
hide
Language(s): eng - English
 Dates: 2020-03-31
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1051/0004-6361/201936494
Other: LOCALID: 3236937
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 635 Sequence Number: A169 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1