PESSTO spectroscopic classification of optical transients

ATel #10094; C. Barbarino, A. Nyholm, F. Taddia, C. Fremling, J. Sollerman (OKC), M. T. Botticella (INAF-Capodimonte), M. Fraser (UCD), C. Inserra, E. Kankare, K. Maguire, S. J. Smartt, K. W. Smith, D. Wright, D. Young (QUB), M. Sullivan (Southampton), S. Valenti (UC Davis), O. Yaron, I. Manulis (Weizmann), B. Stalder, K. Chambers, L. Denneau, H. Flewelling, A. Heinze, M. Huber, E. Magnier, J. Tonry, C. Waters, R. J. Wainscoat, H. Weiland (IfA, Univ. Hawaii), A. Rest (STScI)
on 18 Feb 2017; 15:33 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Francesco Taddia (ftadd@astro.su.se)

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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 Pan-STARRS Survey for Transients (see Chambers et al. 2016, arXiv:1612.05560, and http://pswww.ifa.hawaii.edu ), by the 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 by the ATLAS survey, see Tonry et al. (2011, PASP, 123, 58) and Tonry et al. (ATel #8680). All observations were performed on the ESO New Technology Telescope at La Silla on 2017 February 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 and additional details can be obtained from http://www.pessto.org (via WISeREP) and the IAU Transient Name Server.

 
Survey Name | IAU Name  | RA (J2000) | Dec (J2000) | Disc. Date | Source  | Disc Mag |  z     | Type | Phase       | Notes 
PS17aaw     | AT2017afm | 09 46 07.86| +21 33 54.6 |  20170204  |  PS1    |   20.1   | 0.0637 |  ?   | ?           | (1) 
PS17avu     | SN2017anf | 13 33 13.42| +08 03 25.5 |  20170209  |  PS1    |   18.4   | 0.0233 |  II  | -3 to +3 d  | (2)  
ASASSN-17cl | SN2017auf | 05 02 19.56| -10 21 22.9 |  20170214  |  ASASSN |   17.4   | 0.0133 |  II  | -3 to +3 d  | (3) 
ATLAS17bax  | AT2017aww | 08 37 38.22| +19 24 13.9 |  20170217  |  ATLAS  |   18.2   | 0.0416 |  ?   | ?           | (4,5) 
ATLAS17bas  | SN2017awz | 11 07 35.49| +22 51 04.4 |  20120217  |  ATLAS  |   16.9   | 0.022  |  Ia  | -10 to -8 d | (6) 

(1) Spectrum dominated by the host galaxy, no clear signal from the transient.

(2) Blue spectrum with Balmer P-Cygni profiles, best SNID match to SN 1999em at +1d. Strong galaxy emission lines.

(3) Best SNID match to SN 1999em at -3 d. It was also classified by Xiang et al. in ATel #10093.

(4) Redshift from galaxy emission lines.

(5) Blue spectrum with strong galaxy emission lines. The transient is on top of a bright H II region in the host-galaxy which is visible in the SDSS images.

(6) Best SNID match with SN Ia 1991T-like 1998es at -10 d. Several other good matches with pre-maximum 1991T-like SNe Ia.