J/A+A/578/A9 Optical and NIR spectra of SN iPTF13ebh (Hsiao+, 2015)
Strong near-infrared carbon in the Type Ia supernova iPTF13ebh.
Hsiao E.Y., Burns C.R., Contreras C., Hoeflich P., Sand D., Marion G.H.,
Phillips M.M., Stritzinger M., Gonzalez-Gaitan S., Mason R.E., Folatelli G.,
Parent E., Gall C., Amanullah R., Anupama G.C., Arcavi I., Banerjee D.P.K.,
Beletsky Y., Blanc G.A., Bloom J.S., Brown P.J., Campillay A., Cao Y.,
De Cia A., Diamond T., Freedman W.L., Gonzalez C., Goobar A., Holmbo S.,
Howell D.A., Johansson J., Kasliwal M.M., Kirshner R.P., Krisciunas K.,
Kulkarni S.R., Maguire K., Milne P.A., Morrell N., Nugent P.E., Ofek E.O.,
Osip D., Palunas P., Perley D.A., Persson S.E., Piro A.L., Rabus M.,
Roth M., Schiefelbein J.M., Srivastav S., Sullivan M., Suntzeff N.B.,
Surace J., Wozniak P.R., Yaron O.
<Astron. Astrophys. 578, A9 (2015)>
=2015A&A...578A...9H 2015A&A...578A...9H
ADC_Keywords: Supernovae ; Spectra, infrared
Keywords: infrared: general - supernovae: general -
supernovae: individual: iPTF13ebh
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 CI lines, and the CI λ1.0693um line is the
strongest ever observed in a SN Ia. Interestingly, no strong optical
CII 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 CI compared to the weaker optical CII 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 composition and
density of the inner core similar to that of 91bg-like events, and a
deep reaching carbon burning layer not observed in slower 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 SiII λ0.6355um line, implying a long dark phase
of ∼4 days.
Description:
The data contained here are the optical and near-infrared
spectroscopic data of iPTF13ebh. The spectra are as observed, without
any redshift or extinction corrections.
Objects:
-----------------------------------------
RA (2000) DE Designation(s)
-----------------------------------------
02 21 59.98 +33 16 13.7 SN iPTF13ebh
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 76 24 List of spectra
sp/* . 24 Individual optical and NIR spectra
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Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 "date" Date Observation date
12- 19 A8 --- Tel Telescope name (1)
21- 26 A6 --- Inst Instrument name
28- 32 I5 0.1nm lam.min [3055/8395] Wavelength range (lower value)
34- 38 I5 0.1nm lam.max [8998/27636] Wavelength range (upper value)
40- 76 A37 --- FileName Name of the spectrum file in subdirectory sp
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Note (1): Telescope and instruments as follows:
APO = ARC 3.5-m telescope with Dual Imaging Spectrograph (DIS)
FTN = Faulkes Telescope North with cross-dispersed spectrograph (FLOYDS )
Gemini = Gemini North Telescope with GNIRS infrared spectrograph
HCT = Himalayan Chandra Telescope with Himalaya Faint Object Spectrograph
Camera (HFOSC)
IRTF = NASA Infrared Telescope Facility with SpeX
Keck = Keck II telescope with Deep Imaging Multi-Object Spectrograph DEIMOS
and Keck I telescope with Low Resolution Imaging Spectrometer LRIS
Magellan = Magellan telescope with FIRE and Inamori Magellan Areal Camera and
Spectrograph (IMACS)
NOT = Nordic Optical telescope with Andalucia Faint Object Spectrograph
and Camera (ALFOSC)
P200 = Palomar 200-inch telescope with double Beam Spectrograph (DBSP)
WHT = William Herschel Telescope with Intermediate dispersion
Spectrograph and Imaging System (ISIS)
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Byte-by-byte Description of file: sp/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.1 0.1nm lambda Observed wavelength in Angstrom
10- 24 E15.1 --- Flux ?=- Observed flux Flambda in arbitrary units
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Acknowledgements:
Eric Y. Hsiao, yichi.hsiao(at)gmail.com
(End) Eric Hsiao [Aarhus University], Patricia Vannier [CDS] 27-Mar-2015