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

Athira Menon, Alexander Heger

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch

Abstract

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.

Original languageEnglish
Title of host publicationProceedings of the International Astronomical Union
Subtitle of host publicationVolume 12 Issue s329: the lives and death-throes of massive stars
Place of PublicationCambridge UK
PublisherCambridge University Press
Pages64-68
Number of pages5
Volume12
EditionS329
ISBN (Electronic)1743-9221
ISBN (Print)0074-1809
DOIs
Publication statusPublished - 1 Nov 2016
EventInternational Astronomical Union Symposium 2016: The lives and death-throes of massive stars - The Spencer on Byron Hotel, Auckland, New Zealand
Duration: 28 Nov 20162 Dec 2016
Conference number: 10th
https://web.archive.org/web/20160414070253/http://nzstars2016.nz:80/

Publication series

NameProceedings of the International Astronomical Union
PublisherCambridge University Press
NumberS329
Volume12
ISSN (Print)1743-9213
ISSN (Electronic)1743-9221

Conference

ConferenceInternational Astronomical Union Symposium 2016
Abbreviated titleNZstars 2016
CountryNew Zealand
CityAuckland
Period28/11/162/12/16
OtherNZstars2016 is the 10th IAU Symposia on Massive stars. It will be held from the 28th November to 2nd December 2016 at Auckland, one of the most vibrant, exciting and diverse cities on the Pacific Rim.
Internet address

Keywords

  • (Stars:) binaries (including multiple): Close
  • (Stars:) Supernovae: Individual (sn 1987A)
  • Stars: Evolution

Cite this

Menon, A., & Heger, A. (2016). Blue supergiant progenitors from binary mergers for SN 1987A and other Type II-peculiar supernovae. In Proceedings of the International Astronomical Union: Volume 12 Issue s329: the lives and death-throes of massive stars (S329 ed., Vol. 12, pp. 64-68). (Proceedings of the International Astronomical Union; Vol. 12, No. S329). Cambridge University Press. https://doi.org/10.1017/S1743921317003003