J/MNRAS/438/L101 First month on SN 2013ej (Valenti+, 2014)
The first month of evolution of the slow-rising Type IIP SN 2013ej in M74.
Valenti S., Sand D., Pastorello A., Graham M.L., Howell D.A., Parrent J.T.,
Tomasella L., Ochner P., Fraser M., Benetti S., Yuan F., Smartt S.J.,
Maund J.R., Arcavi I., Gal-Yam A., Inserra C., Young D.
<Mon. Not. R. Astron. Soc., 438, L101-L105 (2014)>
=2014MNRAS.438L.101V 2014MNRAS.438L.101V (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry
Keywords: supernovae: general - supernovae individual: SN 2013ej
Abstract:
We present early photometric and spectroscopic observations of SN
2013ej, a bright Type IIP supernova (SN) in M74. SN 2013ej is one of
the closest SNe ever discovered. The available archive images and the
early discovery help to constrain the nature of its progenitor. The
earliest detection of this explosion was on 2013 July 24.125 ut and
our spectroscopic monitoring with the FLOYDS spectrographs began on
July 27.7 ut, continuing almost daily for two weeks. Daily optical
photometric monitoring was achieved with the 1m telescopes of the Las
Cumbres Observatory Global Telescope (LCOGT) network, and was
complemented by UV data from Swift and near-infrared spectra from
Public ESO Spectroscopic Survey of Transient Objects and Infrared
Telescope Facility. The data from our monitoring campaign show that SN
2013ej experienced a 10d rise before entering into a well-defined
plateau phase. This unusually long rise time for a Type IIP has been
seen previously in SN 2006bp and SN 2009bw. A relatively rare strong
absorption blueward of Hα is present since our earliest
spectrum. We identify this feature as SiII, rather than high-velocity
Hα as sometimes reported in the literature.
Description:
Spectroscopic follow-up of SN 2013ej was primarily obtained using the
twin FLOYDS spectrographs on FTS and the Faulkes Telescope North, at
Haleakala, with an ∼1d cadence. Optical spectra were also obtained
at the Asiago 1.22m telescope with the B&C spectrograph. Optical
(UBVRIgriz) photometric follow-up of SN 2013ej was obtained with the
nine 1 m telescopes of the LCOGT network, and in this Letter we
present data obtained up to one month after the SN discovery.
Objects:
---------------------------------------------------
RA (2000) DE Designation(s)
---------------------------------------------------
01 36 48.16 +15 45 31.0 SN 2013ej = SN 2013ej
---------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 45 242 Photometric Data
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 "date" Date Observation date
12- 20 F9.3 d JD Julian date (JD-2400000)
22- 27 F6.3 mag mag Magnitude in filter
29- 33 F5.3 mag e_mag rms uncertainty on mag
35- 38 A4 --- Filt Filter (UBVRI gprpipszup uvm2 uvw1 uvw2)
40- 45 A6 --- Tel Telescope (1)
--------------------------------------------------------------------------------
Note (1): Telescopes:
1m0-08 (McDonald observatory, USA)
1m0-10, 1m0-12, 1m0-13 (Sutherland, South Africa)
1m0-04, 1m0-05, 1m0-09 (Cerro Tololo, Cile)
1m0-03, 1m0-11 (Siding Spring, Australia)
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 09-Jul-2015