Possible signatures of ejecta-companion interaction in iPTF 13bvn

Ryosuke Hirai, Shoichi Yamada

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    We investigate the possible effects of the supernova (SN) ejecta hitting the companion star in iPTF 13bvn, focusing on the observable features when it becomes visible. iPTF 13bvn is a type Ib SN that may become the first case in which its progenitor is identified as a binary (by observations in the near future). According to calculations by Bersten et al. the progenitor should have a mass ≈3.5 M⊙ to reproduce the SN light curve, and such compact stars can only be produced via binary evolution. This is one of the reasons that we expect the progenitor to be a binary, but this should be confirmed by observing the remaining companion after the SN. Bersten et al.s evolutionary calculations suggest that the companion star will be an overluminous OB star at the moment of SN. With a combination of hydrodynamical and evolutionary simulations, we find that the secondary star will be heated by the SN ejecta and expand to have larger luminosities and lower surface effective temperatures. The star will look like a red supergiant and this should be taken into account when searching for the companion star in the SN ejecta in future observations.

    Original languageEnglish
    Article number170
    JournalAstrophysical Journal
    Volume805
    Issue number2
    DOIs
    Publication statusPublished - 2015 Jun 1

    Fingerprint

    ejecta
    supernovae
    signatures
    companion stars
    stars
    interactions
    simulation
    light curve
    temperature
    luminosity
    calculation
    moments

    Keywords

    • binaries: close
    • stars: evolution
    • supernovae: individual (iPTF 13bvn)

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Possible signatures of ejecta-companion interaction in iPTF 13bvn. / Hirai, Ryosuke; Yamada, Shoichi.

    In: Astrophysical Journal, Vol. 805, No. 2, 170, 01.06.2015.

    Research output: Contribution to journalArticle

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