Title: Imprints of the ejecta–companion interaction in Type Ia supernovae: main-sequence, subgiant, and red giant companions

Abstract

Here, we study supernova ejecta–companion interactions in a sample of realistic semidetached binary systems representative of Type Ia supernova progenitor binaries in a single-degenerate scenario. We model the interaction process with the help of a high-resolution hydrodynamic code assuming cylindrical symmetry. We find that the ejecta hole has a half-opening angle of 40–50° with the density by a factor of 2–4 lower, in good agreement with the previous studies. Quantitative differences from the past results in the amounts and kinematics of the stripped companion material and levels of contamination of the companion with the ejecta material can be explained by different model assumptions and effects due to numerical diffusion. We analyse and, for the first time, provide simulation-based estimates of the amounts and of the thermal characteristics of the shock-heated material responsible for producing a prompt, soft X-ray emission. Besides the shocked ejecta material, considered in the original model by Kasen, we also account for the stripped, shock-heated envelope material of stellar companions, which we predict partially contributes to the prompt emission. The amount of the energy deposited in the envelope is comparable to the energy stored in the ejecta. The total energy budget available for the prompt emission ismore » by a factor of about 2–4 smaller than originally predicted by Kasen. Although the shocked envelope has a higher characteristic temperature than the shocked ejecta, the temperature estimates of the shocked material are in good agreement with the Kasen's model. Finally, the hottest shocked plasma is produced in the subgiant companion case.« less

Authors:

Boehner, P. ^[1]; Plewa, T. ^[1]; Langer, N. ^[2]

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+ Show Author Affiliations

1. Florida State Univ., Tallahassee, FL (United States). Department of Scientific Computing
2. Universität Bonn, Aufdem Hügel (Germany). Argelander-Institut für Astronomie

Publication Date:

Sun Oct 23 00:00:00 EDT 2016

Research Org.:

Florida State Univ., Tallahassee, FL (United States). Department of Scientific Computing; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Org.:

USDOE Office of Science (SC)

OSTI Identifier:

1466746

Grant/Contract Number:  

SC0008823; AC02-05CH11231

Resource Type:

Accepted Manuscript

Journal Name:

Monthly Notices of the Royal Astronomical Society

Additional Journal Information:

Journal Volume: 465; Journal Issue: 2; Journal ID: ISSN 0035-8711

Publisher:

Royal Astronomical Society

Country of Publication:

United States

Language:

English

Subject:

79 ASTRONOMY AND ASTROPHYSICS; hydrodynamics; instabilities; shock waves; binaries: close; supernovae: general