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PESSTO spectroscopic classification of optical transients

ATel #4895; Matt Nicholl (Queen's University Belfast), Lukasz Wyrzykowski, Nadia Blagorodnova (IoA, Cambridge), Joe Polshaw, Cosimo Inserra, Morgan Fraser (Queen's University Belfast), S. Benetti, A. Pastorello, (INAF - Padova Astronomical Observatory), S. Valenti (LCOGT/UCSB), S. Taubenberger (MPA Garching), S. J. Smartt, K. Smith, D. Young (Queen's University Belfast), M. Sullivan (University of Southampton), A. Gal-Yam, O. Yaron (Weizmann Institute for Science).
on 18 Mar 2013; 15:04 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Cosimo Inserra (c.inserra@qub.ac.uk)

Subjects: Optical, Supernovae

PESSTO, the Public ESO Spectroscopic Survey for Transient Objects (see Valenti et al., ATel #4037; http://www.pessto.org ), reports the following supernova classifications. Targets were supplied by the Transient Objects Confirmation Page (http://www.cbat.eps.harvard.edu/unconf/tocp.html) and the OGLE-IV Transient Search (see Wyrzykowski et al., ATEL #4495). All observations were performed on the ESO New Technology Telescope at La Silla on 2013 March 17, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) and GELATO (Harutyunyan et al., 2008, A&A, 488, 383). Classification spectra can be obtained from http://www.pessto.org (via WISeREP).

 
Name                     | RA (J2000)   | Dec (J2000) | Disc. Date |  Disc. Source | Disc Mag  |  z    | Type    |   Phase   | Notes
PSNJ01584182-6420485 | 01:58:41.82 | -64:20:48.4 | 20130215 | TOCP | 15.9 | 0.006 | IIP | ~3 weeks | (1) PSNJ11240925-1219390 | 11:24:09.25 | -12:19:39.0 | 20130213 | TOCP | 18.5 | 0.065 | II | young | (2) OGLE-2013-SN-019 | 02:27:33.91 | -75:08:16.0 | 20130224 | OGLE | 19.4 | 0.079 | IIP | few weeks | (3)

(1) A good match with several Type IIP, at least 3 weeks after maximum light.

(2) H-alpha and H-beta is seen in emission at z=0.065 at ~3000km/s, on a blue continuum, indicating that this is a young Type II supernova. The absolute magnitude at this redshift is -18.7, thus brighter than a normal Type IIP SN; while the measured velocities are lower than typical.

(3) Re-classification of OGLE-2013-SN-019 (ATel #4876). A reddened type IIP supernova a few weeks after maximum light.