J/ApJ/887/75 NIR spectra of SN 2014C 1-5yr post-explosion (Tinyanont+, 2019)
Supernova 2014C: ongoing interaction with extended circumstellar material with
silicate dust.
Tinyanont S., Lau R.M., Kasliwal M.M., Maeda K., Smith N., Fox O.D.,
Gehrz R.D., De K., Jencson J., Bally J., Masci F.
<Astrophys. J., 887, 75 (2019)>
=2019ApJ...887...75T 2019ApJ...887...75T
ADC_Keywords: Supernovae; Spectra, infrared
Keywords: Core-collapse supernovae ; Stellar mass loss
Abstract:
Supernova (SN) 2014C is unique: a seemingly typical hydrogen-poor SN
that started to interact with a dense, hydrogen-rich circumstellar
medium (CSM) ∼100 days post-explosion. The delayed interaction
suggests a detached CSM shell, unlike in a typical SNIIn where the CSM
is much closer and the interaction commences earlier post-explosion,
indicating a different mass-loss history. We present infrared
observations of SN 2014C 1-5yr post-explosion, including uncommon
9.7µm imaging with COMICS on the Subaru telescope. Spectroscopy
shows the intermediate-width HeI 1.083µm emission from the
interacting region up to the latest epoch 1639 days post-explosion.
The last Spitzer/IRAC photometry at 1920 days confirms ongoing CSM
interaction. The 1-10µm spectral energy distributions (SEDs) can be
explained by a dust model with a mixture of 62% carbonaceous and 38%
silicate dust, pointing to a chemically inhomogeneous CSM. The
inference of silicate dust is the first among interacting SNe. An SED
model with purely carbonaceous CSM dust, while possible, requires more
than 0.22M☉ of dust, an order of magnitude larger than what has
been observed in any SNe at this epoch. The light curve beyond 500days
is well fit by an interaction model with a wind-driven CSM and a
mass-loss rate of ∼10-3M☉/yr, which presents an additional CSM
density component exterior to the constant-density shell reported
previously in the literature. SN 2014C could originate in a binary
system, similar to RY Scuti, which would explain the observed chemical
and density profile inhomogeneity in the CSM.
Description:
We obtained five epochs of photometry of SN 2014C in the 1-2.5um JHKs
bands using the Wide-field InfraRed Camera (WIRC) on the 200 inch Hale
Telescope at Palomar Observatory (P200).
SN 2014C has been observed by the InfraRed Array Camera (IRAC) on
board Spitzer at 3.6 and 4.5um in 16 epochs, as part of SPIRITS (PIDs
10136, 11063, 13053, 14089; PI Kasliwal).
We obtained L' (3.43-4.13um) and M' (4.55-4.79um) observations with
the Near InfraRed Imager and spectrograph (NIRI) on the Gemini North
Telescope as part of a fast turnaround program (GN-2018A-FT-108;
PI Tinyanont).
SN 2014C was observed by the COMICS on the Cassegrain focus of the
Subaru Telescope with the N9.7 filter (λ=9.7um,
Δλ=0.9um) on 2018 June 28.
See Section 2.1.
We obtained near-IR 1-2.5um spectra of SN 2014C in seven epochs
spanning from 1 to 5yr post-maximum. Table 2 summarizes all the
spectra taken. We used the twin medium-resolution, long-slit,
echellette spectrographs: TripleSpec on P200 and the Near-Infrared
Echellette Spectrometer (NIRES) on the Keck telescope.
In addition, we also used the Multi-Object Spectrometer for Infra-Red
Exploration (MOSFIRE) on the Keck telescope.
Finally, we obtained 3.0-3.9um spectroscopy using the Gemini
Near-InfraRed Spectrograph (GNIRS) on the Gemini North telescope as
part of a fast turnaround program (GN-2018A-FT-108, PI Tinyanont).
See Section 2.2.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------
22 37 05.60 +34 24 31.9 SN 2014C = SPIRITS14aom
----------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 87 8 Log of Spectroscopic Observations of SN 2014C
sp/* . 8 Individual spectrum in FITS format
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See also:
B/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)
B/gemini : The Gemini Observation Log (CADC, 2001-)
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)
J/ApJ/741/97 : Light curves of Ibc supernovae (Drout+, 2011)
J/MNRAS/411/1597 : LMC point source classification in SAGE-Spec (Woods+, 2011)
J/ApJ/756/173 : Phot. of type IIn SNe 2005ip and 2006jd (Stritzinger+, 2012)
J/ApJ/839/88 : 14 unusual IR transients with Spitzer (Kasliwal+, 2017)
J/ApJ/886/40 : Most luminous SPIRITS IR transients obs. (Jencson+, 2019)
J/ApJS/241/38 : A comprehensive analysis of Spitzer SNe (Szalai+, 2019)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "Y/M/D" Date Date of observation
12- 15 I4 d Epoch [268/1693] Epoch of observation
17- 22 A6 --- Tel Telescope
24- 33 A10 --- Inst Instrument
35- 38 A4 --- Band Band(s)
40- 57 A18 s Exp Exposure time (s)
59- 87 A29 --- FileName Name of the FITS file in subdirectory sp
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 10-May-2021