Universität zu Köln

Moriya, Takashi J., Liu, Zheng-Wei, Mackey, Jonathan ORCID: 0000-0002-5449-6131, Chen, Ting-Wan ORCID: 0000-0002-1066-6098 and Langer, Norbert (2015). Revealing the binary origin of Type Ic superluminous supernovae through nebular hydrogen emission. Astron. Astrophys., 584. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

We propose that nebular H alpha emission, as detected in the Type Ic superluminous supernova iPTF13ehe, stems from matter that is stripped from a companion star when the supernova ejecta collide with it. The temporal evolution, the line broadening, and the overall blueshift of the emission are consistent with this interpretation. We scale the nebular H alpha luminosity predicted for Type Ia supernovae in single-degenerate systems to derive the stripped mass required to explain the H alpha luminosity of iPTF13ehe. We find a stripped mass of 0.1-0.9 solar masses, assuming that the supernova luminosity is powered by radioactivity or magnetar spin down. Because a central heating source is required to excite the H alpha emission, an interaction-powered model is not favored for iPTF13ehe if the H alpha emission is from stripped matter. We derive a companion mass of more than 20 solar masses and a binary separation of less than about 20 companion radii based on the stripping efficiency during the collision, indicating that the supernova progenitor and the companion formed a massive close binary system. If Type Ic superluminous supernovae generally occur in massive close binary systems, the early brightening observed previously in several Type Ic superluminous supernovae may also be due to the collision with a close companion. Observations of nebular hydrogen emission in future Type Ic superluminous supernovae will enable us to test this interpretation.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Moriya, Takashi J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Zheng-Wei UNSPECIFIED UNSPECIFIED UNSPECIFIED Mackey, Jonathan UNSPECIFIED orcid.org/0000-0002-5449-6131 UNSPECIFIED Chen, Ting-Wan UNSPECIFIED orcid.org/0000-0002-1066-6098 UNSPECIFIED Langer, Norbert UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-384981
DOI:	10.1051/0004-6361/201527515
Journal or Publication Title:	Astron. Astrophys.
Volume:	584
Date:	2015
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PAIR-INSTABILITY SUPERNOVAE; LIGHT CURVES; IA SUPERNOVA; LUMINOUS SUPERNOVAE; SHOCK BREAKOUT; MASSIVE BINARIES; COMPANION STAR; POPULATION III; EVOLUTION; SPECTRA Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/38498