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research
Strong near-infrared carbon in the Type Ia supernova iPTF13ebh
Authors
A. Campillay
A. De Cia
+177 more
A. Goobar
A. L. Piro
Amanullah
Benetti
Blondin
Boldt
Branch
Branch
Branch
Branch
Branch
Breeveld
Brown
Burns
Burns
C. Contreras
C. Gall
C. Gonzalez
C. R. Burns
Cao
Conley
Conley
Contreras
Cushing
D. A. Howell
D. A. Perley
D. Osip
D. P. K. Banerjee
D. Sand
De
Dessart
Dressler
E. O. Ofek
E. Parent
E. Y. Hsiao
Elias
Faber
Filippenko
Filippenko
Firth
Folatelli
Folatelli
Folatelli
Foley
Foley
Friesen
G. A. Blanc
G. C. Anupama
G. Folatelli
G. H. Marion
Gamezo
Gamezo
Garavini
Garnavich
Gehrels
Gerardy
González-Gaitán
González-Martín
Goobar
Goobar
Goobar
Hayden
Horne
Howell
Howell
Hoyle
Hsiao
Höflich
Höflich
Höflich
Höflich
Höflich
Höflich
Höflich
I. Arcavi
Iben
J. Johansson
J. M. Schiefelbein
J. S. Bloom
J. Surace
K. Krisciunas
K. Maguire
Kasen
Kelson
Khokhlov
Kirshner
Kozma
Krisciunas
Landolt
Leibundgut
Leloudas
M. M. Kasliwal
M. M. Phillips
M. Rabus
M. Roth
M. Stritzinger
M. Sullivan
Maguire
Maguire
Marion
Marion
Marion
Marion
Matheson
Mazzali
Mazzali
Milne
Motohara
Mould
N. B. Suntzeff
N. Morrell
Nugent
Nugent
O. Yaron
Oke
Oke
P. A. Milne
P. E. Nugent
P. Höflich
P. J. Brown
P. Palunas
P. R. Woźniak
Parrent
Parrent
Pastorello
Penney
Perlmutter
Persson
Phillips
Phillips
Phillips
Phillips
Piro
Piro
R. Amanullah
R. E. Mason
R. P. Kirshner
Rayner
Rheault
Rheault
Riess
Roming
Röpke
S. E. Persson
S. González-Gaitán
S. Holmbo
S. R. Kulkarni
S. Srivastav
Sahu
Scalzo
Silverman
Silverman
Simcoe
Smith
Stritzinger
Stritzinger
Sullivan
T. Diamond
Tanaka
Taubenberger
Telesco
Thomas
Thomas
Thomas
Vacca
W. L. Freedman
Wang
Webbink
Wheeler
Woods
Wyrzykowski
Y. Beletsky
Y. Cao
Yamanaka
Yamaoka
Yaron
Zheng
Publication date
1 January 2015
Publisher
'EDP Sciences'
Doi
Cite
View
on
arXiv
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 Δm15(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
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