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The highly luminous Type Ibn supernova ASASSN-14ms

Vallely, PJ, Prieto, JL, Stanek, KZ, Kochanek, CS, Sukhbold, T, Bersier, D, Brown, JS, Chen, P, Dong, S, Falco, E, Berlind, P, Calkins, M, Koff, RA, Kiyota, S, Brimacombe, J, Shappee, BJ, Holoien, TW-S, Thompson, TA and Stritzinger, MD (2017) The highly luminous Type Ibn supernova ASASSN-14ms. Monthly Notices of the Royal Astronomical Society, 475 (2). pp. 2344-2354. ISSN 0035-8711

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We present photometric and spectroscopic follow-up observations of the highly luminous Type Ibn supernova ASASSN-14ms, which was discovered on UT 2014-12-26.61 at mV ∼ 16.5. With a peak absolute V-band magnitude brighter than −20.5, a peak bolometric luminosity of 1.7 × 1044 erg s−1, and a total radiated energy of 2.1 × 1050 erg, ASASSN-14ms is one of the most luminous Type Ibn supernovae yet discovered. In simple models, the most likely power source for this event is a combination of the radioactive decay of 56Ni and 56Co at late times and the interaction of supernova ejecta with the progenitor's circumstellar medium at early times, although we cannot rule out the possibility of a magnetar-powered light curve. The presence of a dense circumstellar medium is indicated by the intermediate-width He I features in the spectra. The faint (mg ∼ 21.6) host galaxy SDSS J130408.52+521846.4 has an oxygen abundance below 12 + log (O/H) ≲ 8.3, a stellar mass of M* ∼ 2.6 × 108 M⊙, and a star formation rate of SFR ∼ 0.02 M⊙ yr−1.

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: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 11 Apr 2018 10:33
Last Modified: 04 Sep 2021 10:34
DOI or ID number: 10.1093/mnras/stx3303
URI: https://researchonline.ljmu.ac.uk/id/eprint/8458
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