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The Nearby Type Ibn Supernova 2015G: Signatures of Asymmetry and Progenitor Constraints

Shivvers, I and Zheng, W and Dyk, SDV and Mauerhan, J and Filippenko, AV and Smith, N and Foley, RJ and Mazzali, PA and Kamble, A and Kilpatrick, CD and Margutti, R and Yuk, H and Graham, ML and Kelly, PL and Andrews, J and Matheson, T and Wood-Vasey, WM and Ponder, KA and Brown, PJ and Chevalier, R and Milisavljevic, D and Drout, M and Parrent, J and Soderberg, A and Ashall, C and Piascik, A and Prentice, SJ The Nearby Type Ibn Supernova 2015G: Signatures of Asymmetry and Progenitor Constraints. Monthly Notices of the Royal Astronomical Society. ISSN 0035-8711 (Accepted)

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Abstract

SN 2015G is the nearest known SN Ibn to date at 23.2 Mpc and it has proven itself a truly remarkable example of this rare subclass. We present the results of an extensive observational campaign including data from radio through ultraviolet wavelengths. SN 2015G was asymmetric, showing late-time nebular lines redshifted by 1000 km/s. It shared many features with the prototypical SN Ibn 2006jc, including extremely strong He I emission lines and a late-time blue pseudocontinuum. The young SN 2015G showed narrow P-Cygni profiles of He I, but never in its evolution did it show any signature of hydrogen - arguing for a dense, ionized, and hydrogen-free circumstellar medium moving outward with a velocity of 1000 km/s and created by relatively recent mass loss from the progenitor star. Ultraviolet through infrared observations show that the fading SN 2015G (which was probably discovered some 20 days post-peak) had a spectral energy distribution that was well described by a simple, single-component blackbody. Archival HST images provide upper limits on the luminosity of SN 2015G's progenitor, while nondetections of any luminous radio afterglow and optical nondetections of outbursts over the past two decades provide constraints upon its mass-loss history.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: astro-ph.HE; astro-ph.HE
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 08 Aug 2017 11:03
Last Modified: 08 Aug 2017 11:03
DOI or Identification number: 10.1093/mnras/stx1885
URI: http://researchonline.ljmu.ac.uk/id/eprint/6796

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