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PESSTO spectroscopic classification of optical transients

ATel #4303; C. Inserra (Queens University Belfast), F. Cellier-Holzem (LPHNE, Paris), S. J. Smartt, M. Fraser, D. Wright, D. R. Young, K. W. Smith (Queens University Belfast), A. Pastorello, S. Valenti, S. Benetti (INAF-Osservatorio Astronomico di Padova), S. Taubenberger (MPA), M. Sullivan (University of Oxford), A. Gal-Yam, O. Yaron, I. Arcavi (Weizmann Institute for Science), C. Baltay, N. Ellman, E. Hadjiyska, R. McKinnon, D. Rabinowitz (Yale University), U. Feindt, M. Kowalski (Universitat Bonn), P. Nugent (LBL Berkeley)
on 10 Aug 2012; 14:00 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Morgan Fraser (mfraser02@qub.ac.uk)

Subjects: Optical, AGN, 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 La Silla-Quest survey (see Hadjiyska et al., ATel #3812). All observations were performed on the ESO New Technology Telescope at La Silla on 2012 August 9, 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          | Dec         | Disc. Date | Disc. source | Disc. Mag | Redshift | Type      | Phase       | Notes   
LSQ12dww  | 15:17:53.35 | +04:52:29.6 | 20120705   | LSQ          | 19.6      | -        | stellar   | -           | 
LSQ12ehh  | 16:27:12.38 | +02:05:00.2 | 20120727   | LSQ          | 19.9      | 0.10     | SN Ia     | -6          | Normal, match to 04eo 
LSQ12ege  | 16:50:51.89 | +02:52:27.8 | 20120715   | LSQ          | 20.5      | 0.08     | SN Ia     | -5          | Normal, match to 06S       
LSQ12ehj  | 23:09:15.77 | +07:02:53.9 | 20120808   | LSQ          | 18.6      | 0.13     | AGN       | -           | Halpha, Hbeta and [OIII] in emission 
LSQ12dvj  | 01:53:13.58 | -01:51:04.3 | 20120723   | LSQ          | 20.0      | 0.13     | SN Ia-pec | +2-3 weeks  | See note (1) 
 

(1) LSQ12dvj has low velocities and weak SiII 6355A absorption for a Type Ia SN. SNID finds good matches to several peculiar Type Ia SNe, including several members of the class of SN 1991T-like events. Adopting the redshift of the best fit for the former case, the SN reaches an absolute magnitude at peak of around -19 mag.