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

Moriya, TJ, Mazzali, PA, Tominaga, N, Hachinger, S, Blinnikov, SI, Tauris, TM, Takahashi, K, Tanaka, M, Langer, N and Podsiadlowski, P (2016) Light-curve and spectral properties of ultrastripped core-collapse supernovae leading to binary neutron stars. Monthly Notices of the Royal Astronomical Society, 466 (2). pp. 2085-2098. ISSN 0035-8711

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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 radioactive56Ni, and their typical peak luminosity is around 1042erg s-1or -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. © 2016 The Authors.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Date Deposited: 16 Jul 2019 11:20
Last Modified: 16 Jul 2019 11:20
DOI or Identification number: 10.1093/mnras/stw3225
URI: http://researchonline.ljmu.ac.uk/id/eprint/11049

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