PESSTO spectroscopic classification of optical transients

ATel #10012; F. Taddia, J. Sollerman, C. Barbarino, A. Nyholm, E. Karamehmetoglu, C. Fremling (OKC), M. Dennefeld (IAP, UPMC), N. Elias-Rosa (INAF-OAPd), C. Inserra, E. Kankare, K. Maguire, D. Young, K. W. Smith, S. J. Smartt (QUB), M. Sullivan (Southampton), S. Valenti (UC Davis), O. Yaron, I. Manulis (Weizmann), J. Tonry, B. Stalder, L. Denneau, A. Heinze, H. Weiland (IfA, Univ. of Hawaii), A. Rest (STScI), A. Pastorello (INAF-OAPd), and T-W. Chen (MPE).
on 27 Jan 2017; 18:41 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Cristina Barbarino (cristina.barbarino@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. The targets were supplied by ATLAS survey, see Tonry et al. (2011, PASP, 123, 58) and Tonry et al. (ATel #8680), the ESA Gaia Photometric Science Alerts Team and DPAC (http://gsaweb.ast.cam.ac.uk/alerts), 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 the IAU TNS list (see https://wis-tns.weizmann.ac.il/). The observations were performed on the ESO New Technology Telescope at La Silla on 2017 January 26, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classification was done with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024). Classification spectrum 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 
Gaia17acy   | AT2017jt  | 05:00:06.76  | -13:08:31.5 |  20170114  | Gaia   |  18.8    | 0.175 |  ?       |   ?        |  (1) 
Gaia17afb   | SN2017mw  | 09:57:20.97  | -41:35:20.9 |  20170120  | Gaia   |  17.1    | 0.012 |  II      | -7 to -4 d |  (2) 
            | SN2017nf  | 11:10:52.78  | +28:16:27.1 |  20170122  | POSS   |  18.0    | 0.037 |  I       |   ?        |  (3) 
ATLAS17ajs  | SN2017me  | 11:27:54.52  | +27:20:44.7 |  20170120  | ATLAS  |  17.7    | 0.033 |  Ia      | -7 to -4 d |  (4) 
ATLAS17ajn  | SN2017lv  | 11:44:26.53  | -28:27:27.2 |  20170114  | ATLAS  |  18.4    | 0.029 |  Ia      | -7 to -4 d |  (5) 
Gaia17aei   | SN2017lt  | 14:19:44.20  | -16:50:15.7 |  20170117  | Gaia   |  18.3    | 0.043 |  II/IIn  | > +20 d    |  (6) 
ASASSN-17bb | SN2017ng  | 15:20:40.81  | +04:39:34.1 |  20170123  | ASASSN |  16.9    | 0.030 |  Ia      | -3 to +3 d |  (7) 
   

(1) Spectrum shows blue continuum and host emission lines, but the H-alpha emission line seems to show a broader component, which might be from the transient. This could suggest it to be a luminous Type IIn SN. ATLAS shows m_c = 19 mag detections stretching back 30 days.
(2) Best fitting SNID matches are with pre-maximum Type IIb SNe. Host redshift from PSCz.
(3) Low S/N spectrum. Type uncertain. Several matches in SNID with Type Ia and Ibc SNe. Host redshift from NED.
(4) Host redshift from SDSS.
(5) Host redshift from NED.
(6) Best match from SNID is with Type IIn SN1998S. Host redshift from 6dF galaxy survey.
(7) Redshift is best fit from SNID.