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PESSTO spectroscopic classification of optical transients

ATel #7936; S. Prentice, C. Ashall (LJMU), C. Inserra (QUB), S. Taubenberger (ESO), T.-W. Chen (Bonn), K. Maguire (ESO), S. J. Smartt (QUB), K. W. Smith (QUB), M. Sullivan (Southampton), S. Valenti (LCOGT), O. Yaron (Weizmann), D. Young (QUB), Ilan Manulis (Weizmann), I. Arcavi (LCOGT), L. Wyrzykowski (Warsaw Observatory, Poland).
on 21 Aug 2015; 17:44 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Cosimo Inserra (c.inserra@qub.ac.uk)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 7937, 7945

PESSTO, the Public ESO Spectroscopic Survey for Transient Objects (see Smartt et al. 2015, A&A, 579, 40 http://www.pessto.org ), reports the following supernova classifications. Targets were supplied by All Sky Automated Survey for SuperNovae ASAS-SN (see Shappee et al. 2014, ApJ, 788, 48 and http://www.astronomy.ohio-state.edu/~assassin/index.shtml ) and the OGLE-IV Real-time Transient Search (Wyrzykowski et al., 2014 arxiv:1409.1095; http://ogle.astrouw.edu.pl/ )". All observations were performed on the ESO New Technology Telescope at La Silla on 2015-08-20, 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
 
ASASSN-15oi               | 20:39:09.09  | -30:45:20.6 |  20150814  |   ASASSN     |   16.2    | 0.02  |  TDE  |     -    | (1) 
PSNJ23374322-4730393      | 23:37:43.21  | -47:30:39.3 |  20150817  |    CBAT      |   16.3    | 0.01  |  Ia   | -7 to -4 | (2) 
OGLE15dv                  | 01:31:03.46  | -72:08:10.2 |  20150629  |    OGLE      |   19.3    | 0.19  |   -   |     -    | (3)

(1) Broad (~10000 km/s) HeII 4686 lines at redshift z~0.02. Most likely a very young TDE, alternatively it could be a bright, peculiar type Ib SN similar to 2001bh (Elias-Rosa et al. 2015). However we find a good match to PS1-10jh (see Gezari et al. 2012) and PTF09ge (see Arcavi et al. 2014), both TDE candidates at three weeks before maximum. We have triggered our Swift GI program to obtain followup UV and X-ray data and are our associated JVLA program for radio observations.
(2) Match to several normal Ia before maximum light
(3) Very noisy spectrum, clearly dominated by the galaxy. Redshift secured by the galaxy emission lines. The transient had an absolute luminosity of ~-20 around peak.