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SN 2000cx and SN 2013bh: Extremely rare, nearly twin type ia supernovae

Silverman, JM and Vinko, J and Kasliwal, MM and Fox, OD and Cao, Y and Johansson, J and Perley, DA and Tal, D and Wheeler, JC and Amanullah, R and Arcavi, I and Bloom, JS and Gal-Yam, A and Goobar, A and Kulkarni, SR and Laher, R and Lee, WH and Marion, GH and 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: 06 Sep 2017 20:56
DOI or Identification number: 10.1093/mnras/stt1647
URI: http://researchonline.ljmu.ac.uk/id/eprint/6512

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