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PESSTO spectroscopic classification of optical transients

ATel #4876; Simon Hodgkin, Nadia Blagorodnova (IoA, Cambridge), Matt Nicholl (Queen's University Belfast), 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), Lukasz Wyrzykowski (OGLE).
on 11 Mar 2013; 16:02 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Cosimo Inserra (c.inserra@qub.ac.uk)

Subjects: Optical, Supernovae

Referred to by ATel #: 4895

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 Catalina Real-time Transient Survey (http://crts.caltech.edu/), the OGLE-IV Transient Search (see Wyrzykowski et al., ATEL #4495), and the CHASE project. All observations were performed on the ESO New Technology Telescope at La Silla on 2013 March 10, 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
OGLE-2013-SN-019 | 02:27:33.91 | -75:08:16.0 | 20130224 | OGLE | 19.4 | 0.079 | IIn | | (1) SSS130307:114002-350527 | 11:40:02.21 | -35:05:27.2 | 20130307 | CRTS | 18.0 | 0.025 | IIP | ~20d | (2) PSNJ18120245-5858271 | 18:12:02.45 | -58:58:27.1 | 20130228 | CHASE | 16.7 | 0.008 | II | ~14d | (3) CSS130307:134411+030344 | 13:44:10.79 | +03:03:44.2 | 20130307 | CRTS | 18.9 | 0.080 | Ia | -7d | (4)

(1) OGLE2013-SN-019 has a multicomponent Balmer lines in emission (one at FWHM ~2000 km/s plus an unresolved narrow component <1000 km/s) on a blue continuum. From [OIII] lines 4959,5007A and [OII] 3727A we estimated a redshift of z=0.079. Shallow Balmer absorption components (v~10000 km/s) have been identified. The object could be a Type IIn as well as an LBV outburst with abs mag of -18.3.

(2) Good match with several Type IIP at 2 weeks from maximum, then roughly 3 weeks from explosion.

(3) It shows a non particularly blue continuum with Balmer lines velocity at 14500 km/s and well developed lines belonging to He I (or Na I) and Ca II (NIR triplet). Thus, the SN should be around 2 weeks past explosion.

(4) Good match with several Ia a week before maximum light.