The type iin supernova 2010bt: The explosion of a star in outburst

Nancy Elias-Rosa, Schuyler D. van Dyk, Stefano Benetti, Enrico Cappellaro, Nathan Smith, Rubina Kotak, Massimo Turatto, Alexei V. Filippenko, Giuliano Pignata, Ori D. Fox, Lluis Galbany, Santiago González-Gaitán, Matteo Miluzio, L. A.G. Monard, Mattias Ergon

Research output: Contribution to journalArticlepeer-review

Abstract

It is well known that massive stars (M > 8 M☉) evolve up to the collapse of the stellar core, resulting in most cases as a supernova (SN) explosion. Their heterogeneity is related mainly to different configurations of the progenitor star at the moment of the explosion, and to their immediate environments. We present photometry and spectroscopy of SN 2010bt, which was classified as a Type IIn SN from a spectrum obtained soon after discovery and was observed extensively for about two months. After the seasonal interruption owing to its proximity to the Sun, the SN was below the detection threshold, indicative of a rapid luminosity decline. We can identify the likely progenitor with a very luminous star (log L/L☉ ≈ 7) through comparison of Hubble Space Telescope images of the host galaxy prior to explosion with those of the SN obtained after maximum light. Such a luminosity is not expected for a quiescent star, but rather for a massive star in an active phase. This progenitor candidate was later confirmed via images taken in 2015 (∼ 5 yr post-discovery), in which no bright point source was detected at the SN position. Given these results and the SN behavior, we conclude that SN 2010bt was likely a Type IIn SN and that its progenitor was a massive star that experienced an outburst shortly before the final explosion, leading to a dense H-rich circumstellar environment around the SN progenitor.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - May 6 2018

Keywords

  • Galaxies: individual (NGC 7130)
  • Stars: evolution
  • Supernovae: general
  • Supernovae: individual (SN 2010bt)

ASJC Scopus subject areas

  • General

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