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Massive stars exploding in a He-rich circumstellar medium - IX. SN 2014av, and characterization of Type Ibn SNe

Pastorello, A and Wang, X-F and Ciabattari, F and Bersier, D and Mazzali, PA and Gao, X and Xu, Z and Zhang, J-J and Tokuoka, S and Benetti, S and Cappellaro, E and Elias-Rosa, N and Harutyunyan, A and Huang, F and Miluzio, M and Mo, J and Ochner, P and Tartaglia, L and Terreran, G and Tomasella, L and Turatto, M (2016) Massive stars exploding in a He-rich circumstellar medium - IX. SN 2014av, and characterization of Type Ibn SNe. Monthly Notices of the Royal Astronomical Society, 456 (1). pp. 853-859. ISSN 0035-8711

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Abstract

We present spectroscopic and photometric data of the Type Ibn supernova (SN) 2014av, discovered by the Xingming Observatory Sky Survey. Stringent pre-discovery detection limits indicate that the object was detected for the first time about 4 d after the explosion. A prompt follow-up campaign arranged by amateur astronomers allowed us to monitor the rising phase (lasting 10.6 d) and to accurately estimate the epoch of the maximum light, on 2014 April 23 (JD = 245 6771.1 ± 1.2). The absolute magnitude of the SN at the maximum light is MR = −19.76 ± 0.16. The post-peak light curve shows an initial fast decline lasting about three weeks, and is followed by a slower decline in all bands until the end of the monitoring campaign. The spectra are initially characterized by a hot continuum. Later on, the temperature declines and a number of lines become prominent mostly in emission. In particular, later spectra are dominated by strong and narrow emission features of He I typical of Type Ibn supernovae (SNe), although there is a clear signature of lines from heavier elements (in particular O I, Mg II and Ca II). A forest of relatively narrow Fe II lines is also detected showing P-Cygni profiles, with the absorption component blueshifted by about 1200 km s−1. Another spectral feature often observed in interacting SNe, a strong blue pseudo-continuum, is seen in our latest spectra of SN 2014av. We discuss in this paper the physical parameters of SN 2014av in the context of the Type Ibn SN variety.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record MNRAS (February 11, 2016) 456 (1): 853-869. is available online at: http://dx.doi.org/10.1093/mnras/stv2634
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 09 Feb 2016 09:47
Last Modified: 07 Sep 2017 13:19
DOI or Identification number: 10.1093/mnras/stv2634
URI: http://researchonline.ljmu.ac.uk/id/eprint/2872

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