*uEvolution of the Progenitors of SNe 1993J and 2011dh Revealed through Late-time Radio and X-Ray Studies

DOI: 
10.3847/1538-4357/ab0d81
Publication date: 
01/04/2019
Main author: 
Kundu, E.
IAA authors: 
Pérez-Torres, M. A.
Authors: 
Kundu, E.;Lundqvist, P.;Sorokina, E.;Pérez-Torres, M. A.;Blinnikov, S.;O’Connor, E.;Ergon, M.;Chandra, P.;Das, B.
Journal: 
The Astrophysical Journal
Refereed: 
Yes
Publication type: 
Article
Volume: 
875
Pages: 
17
Abstract: 
We perform hydrodynamical simulations of the interaction between supernova (SN) ejecta and circumstellar medium (CSM) for SN 1993J and SN 2011dh, and calculate the radio and X-ray emissions expected from the shocked gas at late epochs (t). Considering the ejecta structure from multi-group radiation hydrodynamics simulation, we find that the observed rapid drop in radio and X-ray light curves of SN 1993J at t &gt; 3000 days may be due to a change in the mass-loss rate (\dot{M}) ∼6500 yr prior to the explosion of the SN. The exact epoch scales inversely with the assumed wind velocity of v <SUB>w</SUB> = 10 {km} {{{s}}}<SUP>-1</SUP>. The progenitor of this SN very likely belonged to a binary system, where, during its evolution, the primary had transferred material to the secondary. It is argued in this paper that the change in \dot{M} can happen because of a change in the mass accretion efficiency (η) of the companion star. It is possible that before ∼6500 (v <SUB>w</SUB>/10 {km} {{{s}}}<SUP>-1</SUP>)<SUP>−1</SUP> yr prior to the explosion, η was high, and thus the CSM was tenuous, which causes the late-time downturn in fluxes. In the case of SN 2011dh, the late-time evolution is found to be consistent with a wind medium with \dot{M}/v <SUB>w</SUB> = 4 × 10<SUP>−6</SUP> {M}<SUB>ȯ </SUB> {yr}}<SUP>-1</SUP>/10 {km} {{{s}}}<SUP>-1</SUP>. It is difficult from our analysis to predict whether the progenitor of this SN had a binary companion; however, if future observations show a similar decrease in radio and X-ray fluxes, then this would give strong support to a scenario where both SNe had undergone a similar kind of binary evolution before explosion.
Database: 
ADS
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85067279974&doi=10.3847%2f1538-4357%2fab0d81&partnerID=40&md5=721f62f26b1e9ebf5e40570cf0f1960c
ADS Bibcode: 
2019ApJ...875...17K
Keywords: 
circumstellar matter;hydrodynamics;radiation mechanisms: non-thermal;radiation mechanisms: thermal;supernovae: individual: SN 1993J;SN 2011dh;Astrophysics - High Energy Astrophysical Phenomena