J/ApJ/813/30 UV-Optical light curves of the SNIa iPTF14bdn (Smitka+, 2015)
The 1999aa-like Type Ia supernova iPTF14bdn in the ultraviolet and optical.
Smitka M.T., Brown P.J., Suntzeff N.B., Zhang J., Zhai Q., Wang X., Mo J.,
Zhang T.
<Astrophys. J., 813, 30 (2015)>
=2015ApJ...813...30S 2015ApJ...813...30S (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry, UBVRI ; Photometry, ultraviolet
Keywords: line: formation; line: identification; ultraviolet: stars ;
supernovae: individual: (iPTF14bdn, SN 1991T, SN 1999aa)
Abstract:
We present ultraviolet (UV) and optical photometry and spectra of the
1999aa-like supernova (SN) iPTF14bdn. The UV data were observed using
the Swift Ultraviolet/Optical Telescope (UVOT) and constitute the
first UV spectral series of a 1999aa-like SN. From the photometry, we
measure Δm15(B)=0.84±0.05mag and blue UV colors at epochs
earlier than -5 days. The spectra show that the early-time blue colors
are the result of less absorption between 2800-3200Å than is
present in normal SNe Ia. Using model spectra fits of the data at -10
and +10days, we identify the origin of this spectral feature to be a
temperature effect in which doubly ionized iron group elements create
an opacity "window". We determine that the detection of high
temperatures and large quantities of iron group elements at early
epochs imply the mixing of a high Ni mass into the outer layers of the
SN ejecta. We also identify the source of the I-band secondary maximum
in iPTF14bdn to be the decay of FeIII to FeII, as is seen in normal
SNe Ia.
Description:
iPTF14bdn was discovered in UGC 8503 (z=0.01558) on 2014 May 27.40 by
the intermediate Palomar Transient Factory (PTF).
We began a Swift UVOT photometric monitoring program on 2014 May 27
and determined that the target had become bright enough for
spectroscopic observations to begin on 2014 June 05. Six epochs of
spectra were observed between phases -9 through +18 days using both
the UV and V grisms (between 2014 June 05 and July 02).
We observed optical photometry and spectrophotometry with the Lijiang
2.4m telescope (LJT) and the Yunnan Faint Object Spectrograph and
Camera (YFOSC). Photometric observations were made in the UBVRI
bandpasses between the dates of 2014 May 29 and July 24.
Additional photometric measurements in the UBVRI bandpasses were made
using the 80cm Tsinghua-NAOC (National Astronomical Observatories of
China) Telescope (TNT) between the dates of 2014 June 18 and June 28.
Objects:
----------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------
13 30 44.88 +32 45 42.4 iPTF14bdn = iPTF 14bdn
----------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 32 215 Photometry of iPTF14bdn
table4.dat 16 6433 YFOSC instrument filter responses
--------------------------------------------------------------------------------
See also:
J/ApJ/812/31 : Local Star Formation effects on type Ia SNe (Jones+, 2015)
J/ApJ/805/74 : SN2014J Swift/UVOT light curves (Brown+, 2015)
J/AJ/148/1 : Optical and ultraviolet photometry of SN 2012fr (Zhang+, 2014)
J/A+A/554/A27 : 2011fe spectrophotometric time series (Pereira+, 2013)
J/ApJ/749/18 : Swift/UVOT observations of 12 nearby SN-Ia (Brown+, 2012)
J/AJ/142/156 : The CSP (DR2): photometry of SNe Ia (Stritzinger+, 2011)
J/ApJ/721/1608 : Absolute UV magnitudes of type Ia SNe (Brown+, 2010)
J/ApJ/716/712 : HST light curves of six SNe and Union2 (Amanullah+, 2010)
J/AJ/139/519 : Carnegie supernova project. SNe Ia (Contreras+, 2010)
J/ApJS/185/32 : First-year SDSS-II SN results (Kessler+, 2009)
J/AJ/137/3731 : ESSENCE high-redshift supernova (Foley+, 2009)
J/AJ/131/527 : UBVRI light curves of 44 type Ia supernovae (Jha+, 2006)
J/ApJ/602/571 : High-redshift supernovae IRZ fluxes (Barris+, 2004)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Filt Filter used in the observation (UBVRI, UVM2,
UVW1 or UVW2) (1)
6- 10 A5 --- Tel Telescope ("LJT"=Lijiang 2.4m Telescope,
"TNT"=Tsinghua-NAOC Telescope or "UVOT" (Swift))
12- 19 F8.2 d MJD [56804.7/56868.4] Modified Julian Date of
the observation
21- 26 F6.3 mag mag [14.3/20.2] Observed magnitude in Filt
28- 32 F5.3 mag e_mag [0.02/0.4] Error in mag
--------------------------------------------------------------------------------
Note (1): Light-curve Parameters of iPTF14bdn (table 3):
-----------------------------------------------------------------
Filter Peak MJD Peak Mag Δm15
(mag)
-----------------------------------------------------------------
UVM2 56819.6 +or- 0.6 18.63 +or- 0.04 0.59 +or- 0.21
UVW2 56819.3 +or- 0.3 17.84 +or- 0.03 0.83 +or- 0.11
UVW1 56818.4 +or- 0.2 16.18 +or- 0.02 1.02 +or- 0.05
U 56819.0 +or- 0.2 14.28 +or- 0.02 1.27 +or- 0.07
B 56822.5 +or- 0.3 14.75 +or- 0.02 0.84 +or- 0.05
V 56823.2 +or- 0.2 14.83 +or- 0.01 0.60 +or- 0.04
R 56825.7 +or- 0.4 14.87 +or- 0.02 0.61 +or- 0.04
I 56822.7 +or- 0.2 15.10 +or- 0.02 0.67 +or- 0.02
-----------------------------------------------------------------
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- Filt [BIRUV] LJT/YFOSC filter name (UBVRI) (1)
3- 9 F7.1 0.1nm lambda [3130/11000] Wavelength; Angstroms
11- 16 F6.3 % Trans [-0.003/71.1] Throughput of Filt
--------------------------------------------------------------------------------
Note (1): The Lijiang 2.4m telescope and the Yunnan Faint Object Spectrograph
and Camera (YFOSC; Zhang et al. 2014, J/AJ/148/1).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 11-Feb-2016