J/ApJ/797/24 Imaging observations of iPTF 13ajg (Vreeswijk+, 2014)
The hydrogen-poor superluminous supernova iPTF 13ajg and its host galaxy
in absorption and emission.
Vreeswijk P.M., Savaglio S., Gal-Yam A., De Cia A., Quimby R.M.,
Sullivan M., Cenko S.B., Perley D.A., Filippenko A.V., Clubb K.I.,
Taddia F., Sollerman J., Leloudas G., Arcavi I., Rubin A., Kasliwal M.M.,
Cao Y., Yaron O., Tal D., Ofek E.O., Capone J., Kutyrev A.S., Toy V.,
Nugent P.E., Laher R., Surace J., Kulkarni S.R.
<Astrophys. J., 797, 24 (2014)>
=2014ApJ...797...24V 2014ApJ...797...24V (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry, SDSS ; Photometry, UBVRI ;
Photometry, infrared
Keywords: ISM: atoms - supernovae: general - supernovae: individual: iPTF 13ajg
Abstract:
We present imaging and spectroscopy of a hydrogen-poor superluminous
supernova (SLSN) discovered by the intermediate Palomar Transient Factory,
iPTF 13ajg. At a redshift of z=0.7403, derived from narrow absorption
lines, iPTF 13ajg peaked at an absolute magnitude of Mu,AB=-22.5,
one of the most luminous supernovae to date. The observed bolometric
peak luminosity of iPTF 13ajg is 3.2x1044 erg/s, while the estimated
total radiated energy is 1.3x1051 erg. We detect narrow absorption
lines of Mg I, Mg II, and Fe II, associated with the cold interstellar
medium in the host galaxy, at two different epochs with X-shooter at
the Very Large Telescope. From Voigt profile fitting, we derive the
column densities log N(Mg I)=11.94±0.06, log N(Mg II)=14.7±0.3,
and log N(Fe II)=14.25±0.10. These column densities, as well as the
Mg I and Mg II equivalent widths of a sample of hydrogen-poor SLSNe
taken from the literature, are at the low end of those derived for
gamma-ray bursts (GRBs) whose progenitors are also thought to be
massive stars. This suggests that the environments of hydrogen-poor
SLSNe and GRBs are different. From the nondetection of Fe II
fine-structure absorption lines, we derive a lower limit on the distance
between the supernova and the narrow-line absorbing gas of 50 pc. The
neutral gas responsible for the absorption in iPTF 13ajg exhibits a
single narrow component with a low velocity width, ΔV=76 km/s,
indicating a low-mass host galaxy. No host galaxy emission lines are
detected, leading to an upper limit on the unobscured star formation
rate (SFR) of SFR[OII]<0.07 M☉/yr. Late-time imaging shows
the iPTF 13ajg host galaxy to be faint, with gAB∼27.0 and
RAB≥26.0 mag, corresponding to MB,Vega≳-17.7 mag.
Description:
iPTF 13ajg was imaged with the Palomar 48 inch (P48) Oschin iPTF
survey telescope equipped with a 12kx8k CCD mosaic camera (Rahmer et al.
2008SPIE.7014E..4YR) in the Mould R filter, the Palomar 60 inch and
CCD camera (Cenko et al. 2006PASP..118.1396C 2006PASP..118.1396C) in Johnson B and Sloan
Digital Sky Survey (SDSS) gri, the 2.56 m Nordic Optical Telescope (on
La Palma, Canary Islands) with the Andalucia Faint Object Spectrograph
and Camera (ALFOSC) in SDSS ugriz, the 4.3 m Discovery Channel
Telescope (at Lowell Observatory, Arizona) with the Large Monolithic
Imager (LMI) in SDSS r, and with LRIS (Oke et al. 1995PASP..107..375O 1995PASP..107..375O)
and the Multi-Object Spectrometer for Infrared Exploration (MOSFIRE;
McLean et al. 2012SPIE.8446E..0JM), both mounted on the 10 m Keck-I
telescope (on Mauna Kea, Hawaii), in g and Rs with LRIS and J and Ks
with MOSFIRE.
Objects:
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RA (ICRS) DE Designation(s)
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16 39 03.95 +37 01 38.4 iPTF 13ajg = PTF 13ajg
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 67 141 Log of imaging observations of iPTF 13ajg
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See also:
II/294 : The SDSS Photometric Catalog, Release 7
(Adelman-McCarthy+, 2009)
II/313 : Palomar Transient Factory (PTF) photometric catalog 1.0
(Ofek+, 2012)
J/MNRAS/448/1206 : Superluminous supernovae in faint galaxies (McCrum+, 2015)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 F9.3 d MJD Modified Julian Date
11- 17 F7.3 d Time Observed time relative to R band peak (1)
19- 25 F7.3 d Phase Phase
27- 38 A12 --- Tel Telescope identifier (2)
40- 46 A7 min Exp Exposure time
48- 50 A3 --- Filter Filter used (ugriz, B, R, Rs, J or Ks)
52- 54 F3.1 arcsec Seeing Seeing
56 A1 --- l_mag [>] Limit flag on mag
58- 62 F5.2 mag mag Magnitude in Filter (3)
64- 67 F4.2 mag e_mag ? Uncertainty in mag
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Note (1): Where R band peak was JD=2456406.1.
Note (2): Telescope as follows:
P48 = Palomar 48-inch Oschin iPTF survey telescope;
P60 = Palomar 60-inch telescope;
NOT+ALFOSC = Nordic Optical Telescope+Andalucia Faint Object Spectrograph
and Camera
DCT+LMI = Discovery Channel Telescope+Large Monolithic Imager
Keck+LRIS = Keck-I telescope+Low Resolution Imaging Spectrograph
Keck+MOSFIRE = Keck-I telescope+Multi-Object Spectrometer for Infrared
Exploration
Note (3): The magnitudes have not been corrected for Galactic extinction.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 14-Aug-2017