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Strong near-infrared carbon in the Type Ia supernova iPTF13ebh

Hsiao, EY and Burns, CR and Contreras, C and Höflich, P and Sand, D and Marion, GH and Phillips, MM and Stritzinger, M and González-Gaitán, S and Mason, RE and Folatelli, G and Parent, E and Gall, C and Amanullah, R and Anupama, GC and Arcavi, I and Banerjee, DPK and Beletsky, Y and Blanc, GA and Bloom, JS and Brown, PJ and Campillay, A and Cao, Y and De Cia, A and Diamond, T and Freedman, WL and Gonzalez, C and Goobar, A and Holmbo, S and Howell, DA and Johansson, J and Kasliwal, MM and Kirshner, RP and Krisciunas, K and Kulkarni, SR and Maguire, K and Milne, PA and Morrell, N and Nugent, PE and Ofek, EO and Osip, D and Palunas, P and Perley, DA and Persson, SE and Piro, AL and Rabus, M and Roth, M and Schiefelbein, JM and Srivastav, S and Sullivan, M and Suntzeff, NB and Surace, J and Woźniak, PR and Yaron, O (2015) Strong near-infrared carbon in the Type Ia supernova iPTF13ebh. Astronomy & Astrophysics, 578. ISSN 1432-0746

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Abstract

We present near-infrared (NIR) time-series spectroscopy, as well as complementary ultraviolet (UV), optical, and NIR data, of the Type Ia supernova (SN Ia) iPTF13ebh, which was discovered within two days from the estimated time of explosion. The first NIR spectrum was taken merely 2.3 days after explosion and may be the earliest NIR spectrum yet obtained of a SN Ia. The most striking features in the spectrum are several NIR C i lines, and the C iλ1.0693 μm line is the strongest ever observed in a SN Ia. Interestingly, no strong optical C ii counterparts were found, even though the optical spectroscopic time series began early and is densely cadenced. Except at the very early epochs, within a few days from the time of explosion, we show that the strong NIR C i compared to the weaker optical C ii appears to be general in SNe Ia. iPTF13ebh is a fast decliner with Δm<inf>15</inf>(B) = 1.79 ± 0.01, and its absolute magnitude obeys the linear part of the width-luminosity relation. It is therefore categorized as a "transitional" event, on the fast-declining end of normal SNe Ia as opposed to subluminous/91bg-like objects. iPTF13ebh shows NIR spectroscopic properties that are distinct from both the normal and subluminous/91bg-like classes, bridging the observed characteristics of the two classes. These NIR observations suggest that composition and density of the inner core are similar to that of 91bg-like events, and that it has a deep-reaching carbon burning layer that is not observed in more slowly declining SNe Ia. There is also a substantial difference between the explosion times inferred from the early-time light curve and the velocity evolution of the Si iiλ0.6355 μm line, implying a long dark phase of ∼4 days. © 2015 ESO.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Astrophysics Research Institute
Publisher: EDP Sciences
Date Deposited: 22 Feb 2017 09:11
Last Modified: 07 Sep 2017 09:37
DOI or Identification number: 10.1051/0004-6361/201425297
URI: http://researchonline.ljmu.ac.uk/id/eprint/5692

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