Silverman, JM, Vinko, J, Kasliwal, MM, Fox, OD, Cao, Y, Johansson, J, Perley, DA, Tal, D, Wheeler, JC, Amanullah, R, Arcavi, I, Bloom, JS, Gal-Yam, A, Goobar, A, Kulkarni, SR, Laher, R, Lee, WH, Marion, GH, Nugent, PE and Shivvers, I (2013) SN 2000cx and SN 2013bh: Extremely rare, nearly twin type ia supernovae. Monthly Notices of the Royal Astronomical Society, 436 (2). pp. 1225-1237. ISSN 0035-8711

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Abstract

The Type Ia supernova (SN Ia) SN 2000cx was one of the most peculiar transients ever discovered, with a rise to maximum brightness typical of a SN Ia, but a slower decline and a higher photospheric temperature. 13 yr later SN 2013bh (also known as iPTF13abc), a near identical twin, was discovered and we obtained optical and near-infrared photometry and low-resolution optical spectroscopy from discovery until about 1 month past r-band maximum brightness. The spectra of both objects show iron-group elements [Co II, Ni II, FeII, Fe III and high-velocity features (HVFs) of Ti II], intermediate-mass elements (Si II, Si III and S II) and separate normal velocity features (~12 000 km s-1) and HVFs (~24 000 km s-1) of Ca II. Persistent absorption from Fe III and Si III, along with the colour evolution, implies high blackbody temperatures for SNe 2013bh and 2000cx (~12 000 K). Both objects lack narrow Na I D absorption and exploded in the outskirts of their hosts, indicating that the SN environments were relatively free of interstellar or circumstellar material and may imply that the progenitors came from a relatively old and low-metallicity stellar population. Models of SN 2000cx, seemingly applicable to SN 2013bh, imply the production of up to 1 M of 56Ni and (4.3-5.5) × 10-3 M⊙ of fast-moving Ca ejecta. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

Item Type:	Article
Additional Information:	This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2013 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:	23 May 2017 10:45
Last Modified:	26 Apr 2022 14:52
DOI or ID number:	10.1093/mnras/stt1647
URI:	https://researchonline.ljmu.ac.uk/id/eprint/6512

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