The old environment of the faint calcium-rich supernova SN 2005cz

Hagai Perets, Avishay Gal-Yam, R. Mark Crockett, Joseph P. Anderson, Phil A. James, Mark Sullivan, James D. Neill, Douglas C. Leonard

Research output: Contribution to journalArticlepeer-review

Abstract

The supernova SN 2005cz has recently attracted some attention due to the fact that it was spectroscopically similar to type Ib supernovae (SNe Ib), a class that is presumed to result from the core collapse of massive stars, yet it occurred in an elliptical galaxy, where one expects very few massive stars to exist. Two explanations for this remarkable event were put forward. Perets et al. associate SN 2005cz with the class of Ca-rich, faint SNe Ib, which likely result from old double-white-dwarf systems with an He-rich secondary. On the other hand, Kawabata et al. suggest that SN 2005cz is indeed a core-collapse event (in a binary system), albeit of a star at the lower end of the mass range, 10-12 M. The existence of this star in its elliptical host is explained as resulting from low-level star formation (SF) activity in that galaxy. Here we present extensive observations of the location of SN 2005cz, sensitive to a variety of SF tracers, including optical spectroscopy, Ha emission, UV emission, and Hubble Space Telescope photometry. We show that NGC 4589, the host galaxy of SN 2005cz, does not show any signatures of a young stellar population or recent SF activity either close to or far from the location of SN 2005cz.

Original languageEnglish
Article numberL36
JournalAstrophysical Journal Letters
Volume728
Issue number2 PART II
DOIs
StatePublished - 20 Feb 2011

Keywords

  • Galaxies: star formation
  • H II regions
  • Stars: formation
  • Supernovae: general
  • Supernovae: individual (SN 2005cz)
  • White dwarfs

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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