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


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
Number of pages5
ISBN (Electronic)1743-9221
ISBN (Print)0074-1809
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

Publication series

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


ConferenceInternational Astronomical Union Symposium 2016
Abbreviated titleNZstars 2016
CountryNew Zealand
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


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

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