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Spectroscopic Classifications of Supernovae with Keck

ATel #5458; R. J. Foley, M. K. Conlon (University of Illinois), D. Kasen (UCB/LBL), S. J. Smartt, K. Smith, D. Wright, D. R. Young, R. Kotak, (QUB), S. Valenti (LCOGT), W. Burgett, K. Chambers, P. Draper, M. Huber, R. P. Kudritzki, G. Magnier, N. Metcalfe, J. Morgan, J. Tonry, W. Sweeney, C. Waters (Hawaii/IfA), C. Stubbs (Harvard), and A. Rest (STScI)
on 9 Oct 2013; 17:18 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ryan Foley (rfoley@cfa.harvard.edu)

Subjects: Optical, Supernovae

Referred to by ATel #: 5850

We report the following supernova classifications made from spectra obtained with the DEIMOS spectrograph on Keck II. Targets were supplied by the Pan-STARRS 3pi search. All observations were made on 2013 October 7 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

NameRA (J2000)Dec (J2000)Disc. DateDisc. MagzTypePhaseNotes
PS1-13dcd20:57:29.00+11:52:14.52013-09-0618.10.030SN Ia+50 days(1)
PS1-13dfd18:12:55.32+64:18:38.32013-09-1618.20.069SN Ia+15 days(2)
PS1-13dgl21:13:22.64-30:31:57.92013-09-2218.80.073SN Ia+13 days(3)
PS1-13dhm23:41:35.14+03:43:30.22013-09-2518.40.010SN II+5-15 days(4)
PS1-13dkh03:11:16.09+15:42:58.32013-10-0317.30.03SN Iamaximum(5)
PS1-13dkw00:30:19.05-01:41:46.82013-10-0418.30.044(6)
PS1-13dlg03:17:16.15-15:02:57.22013-10-0518.20.032SN IIn(7)
PS1-13dlh23:47:52.95+07:04:56.02013-10-0517.90.035SN Iamaximum(8)

(1) Hosted by CGCG 425-023.
(2) Same object as CSS130917:181255+641840.
(3) Hosted by 2MASX J21132265-3032004.
(4) Same object as PSN J23413520+0343305. Hosted by NGC 7732. Also classified by Childress et al. (ATel #5455). H alpha has a velocity of -5,400 km/s. Best SNID matches are to SN 2005cs. The velocity and spectral comparison suggests that this may be a low-luminosity SN IIP.
(5) SNID matches indicate that the SN is similar to SN 1991T. Si II 6355 has a velocity of -9,000 km/s.
(6) Hosted by 2dFGRS S819Z288. Blue, largely featureless spectrum. There is a narrow, presumably galactic H alpha line at z = 0.042. There is also a possible faint broad H alpha emission feature. This is likely a young core-collapse SN.
(7) Hosted by FGC 0407. The spectrum is somewhat similar to those of LBV outbursts / SN impostors. The broad H alpha absorption has a FWZI of ~18,000 km/s. There is an additional narrow absorption for the Balmer lines, with H alpha having an absorption velocity of -1700 km/s. Despite spectral similarities with SN impostors, the peak absolute magnitude of the transient is < -18, indicating that it is a likely SN.
(8) Hosted by 2MASX J23475270+0704569. SN is reddened and Na D has an EW of 2.9 A. Si II 6355 has a velocity of -11,100 km/s.

The Pan-STARRS1 Surveys (PS1) have been made possible through contributions of the Institute for Astronomy, the University of Hawaii, the Pan-STARRS Project Office, the Max-Planck Society and its participating institutes, the Max Planck Institute for Astronomy, Heidelberg and the Max Planck Institute for Extraterrestrial Physics, Garching, The Johns Hopkins University, Durham University, the University of Edinburgh, Queen's University Belfast, the Harvard-Smithsonian Center for Astrophysics, the Las Cumbres Observatory Global Telescope Network Incorporated, the National Central University of Taiwan, the Space Telescope Science Institute, the National Aeronautics and Space Administration under Grant No. NNX08AR22G issued through the Planetary Science Division of the NASA Science Mission Directorate, the National Science Foundation under Grant No. AST-1238877, the University of Maryland, and Eotvos Lorand University (ELTE).