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Blue supergiant progenitors from binary mergers for SN 1987A and other Type II-peculiar supernovae

Published online by Cambridge University Press:  28 July 2017

Athira Menon  and
Alexander Heger
Athira Menon
Affiliation:
Monash Centre for Astrophysics (MoCA) and School of Physics and Astronomy, Monash University, Clayton, VIC 3800, Australia email: athira.menon@monash.edu
Alexander Heger
Affiliation:
Monash Centre for Astrophysics (MoCA) and School of Physics and Astronomy, Monash University, Clayton, VIC 3800, Australia email: athira.menon@monash.edu School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, U.S.A. Centre for Nuclear Astrophysics, Shanghai Jiao Tong University, Shanghai, China email: alexander.heger@monash.edu
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Abstract

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We present results of a systematic and detailed stellar evolution study of binary mergers for blue supergiant (BSG) progenitors of Type II supernovae, particularly for SN 1987A. We are able to reproduce nearly all observational aspects of the progenitor of SN 1987A, Sk –69 °202, such as its position in the HR diagram, the enrichment of helium and nitrogen in the triple-ring nebula and its lifetime before its explosion. We build our evolutionary model based on the merger model of Podsiadlowski et al. (1992), Podsiadlowski et al. (2007) and empirically explore an initial parameter consisting of primary masses, secondary masses and different depths up to which the secondary penetrates the He core during the merger. The evolution of the post-merger star is continued until just before iron-core collapse. Of the 84 pre-supernova models (16 M⊙ − 23 M⊙) computed, the majority of the pre-supernova models are compact, hot BSGs with effective temperature >12 kK and 30 R⊙ − 70 R⊙ of which six match nearly all the observational properties of Sk –69 °202.

Keywords

(stars:) supernovae: individual (SN 1987A)stars: evolution(stars:) binaries (including multiple): close
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S329: The Lives and Death-Throes of Massive Stars , November 2016 , pp. 64 - 68
Copyright
Copyright © International Astronomical Union 2017 

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