Light-curve and spectral properties of ultrastripped core-collapse supernovae leading to binary neutron stars

Takashi J. Moriya, Paolo A. Mazzali, Nozomu Tominaga, Stephan Hachinger, Sergei I. Blinnikov, Thomas M. Tauris, Koh Takahashi, Masaomi Tanaka, Norbert Langer, Philipp Podsiadlowski

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30 Citations (Scopus)

Abstract

We investigate light-curve and spectral properties of ultrastripped core-collapse supernovae. Ultrastripped supernovae are the explosions of heavily stripped massive stars that lost their envelopes via binary interactions with a compact companion star. They eject only~0.1M and may be the mainway to form double neutron-star systems that eventually merge emitting strong gravitationalwaves.We followthe evolution of an ultrastripped supernova progenitor until iron core collapse and perform explosive nucleosynthesis calculations. We then synthesize light curves and spectra of ultrastripped supernovae using the nucleosynthesis results and present their expected properties. Ultrastripped supernovae synthesize ~0.01M of radioactive 56Ni, and their typical peak luminosity is around 1042 erg s-1 or -16 mag. Their typical rise time is 5-10 d. Comparing synthesized and observed spectra, we find that SN 2005ek, some of the socalled calcium-rich gap transients, and SN 2010X may be related to ultrastripped supernovae. If these supernovae are actually ultrastripped supernovae, their event rate is expected to be about 1 per cent of core-collapse supernovae. Comparing the double neutron-star merger rate obtained by future gravitational-wave observations and the ultrastripped supernova rate obtained by optical transient surveys identified with our synthesized light-curve and spectral models, we will be able to judge whether ultrastripped supernovae are actually a major contributor to the binary neutron-star population and provide constraints on binary stellar evolution.

Original languageEnglish
Pages (from-to)2085-2098
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume466
Issue number2
DOIs
Publication statusPublished - 2017 Jan 1
Externally publishedYes

Keywords

  • Gravitational waves
  • Supernovae: general
  • Supernovae: individual: PTF10iuv
  • Supernovae: individual: SN 2005ek
  • Supernovae: individual: SN 2010X

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Moriya, T. J., Mazzali, P. A., Tominaga, N., Hachinger, S., Blinnikov, S. I., Tauris, T. M., Takahashi, K., Tanaka, M., Langer, N., & Podsiadlowski, P. (2017). Light-curve and spectral properties of ultrastripped core-collapse supernovae leading to binary neutron stars. Monthly Notices of the Royal Astronomical Society, 466(2), 2085-2098. https://doi.org/10.1093/mnras/stw3225