ePESSTO spectroscopic classification of optical transients

ATel #11560; D. Malesani (DAWN, DARK), K. E. Heintz (Univ. Iceland, DAWN), G. Leloudas (DARK), P. D'Avanzo (INAF-OAB), C. Barbarino (Stockholm), T. W. Chen (MPE), Z. Kostrzewa-Rutkowska (SRON/RU), M. Gromadzki (Warsaw), F. Onori (SRON), C. Inserra (Southampton), E. Kankare, K. Maguire, S. J. Smartt (QUB), O. Yaron (Weizmann), D. Young , K. W. Smith (QUB), D. E. Wright (Univ. of Minnesota), K. C. Chambers, H. Flewelling, M. Huber, T. Lowe, E. Magnier, A. Schultz, C. Waters, R. J. Wainscoat, M. Willman (IfA, Univ. of Hawaii)
on 22 Apr 2018; 16:27 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Giorgos Leloudas (giorgos@dark-cosmology.dk)

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ePESSTO, the extended 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 the Pan-STARRS Survey for Transients (see Chambers et al. 2016, arXiv:1612.05560, and http://pswww.ifa.hawaii.edu ), 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 ), the Catalina Real-time Transient Survey (CRTS; Drake et al. 2009, ApJ, 696, 870 ; http://crts.caltech.edu/ ), and the PMO-Tsinghua Transient Survey (PTSS; http://www.cneost.org/ptss2/index.php ). All observations were performed on the ESO New Technology Telescope at La Silla on 2018 April 21 UT, 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 
ASASSN-18ia | SN 2018aus | 11 00 11.08 | -36 31 38.9  | 2018 04 14 | ASAS-SN     | 17.9     | 0.06  | Ia     | +6 to +9 |  
Gaia18azr   | SN 2018awj | 10 03 06.90 | -15 28 22.1  | 2018 04 07 | Gaia        | 19.6     | 0.03  | Ia     | max      | (1) 
Gaia18axa   | SN 2018atb | 10 03 29.77 | -09 39 53.9  | 2018 03 10 | Gaia        | 18.6     | 0.03  | Ia-02cx| > +20    | (2)  
Gaia18axh   | SN 2018ati | 10 12 24.78 | -15 10 52.7  | 2018 04 09 | Gaia        | 18.6     | 0.08  | Ia     |+11 to +20|  
ASASSN-18ii | SN 2018avp | 13 00 26.54 |  18 37 10.0  | 2018 04 16 | ASAS-SN     | 17.9     | 0.053 | Ia     | +4 to +7 | (3) 
            | SN 2018aws | 12 22 18.76 |  09 01 52.6  | 2018 04 20 | SNHunt      | 20.5     | 0.14  | Ia     | max      |  
ASASSN-18it | SN 2018awt | 11 48 45.10 | -18 24 34.3  | 2018 04 19 | ASAS-SN     | 18.1     | 0.07  | Ia     | max      | (3) 
ASASSN-18iw | SN 2018ayg | 14 43 39.04 |  18 52 12.6  | 2018 04 21 | ASAS-SN     | 18.1     | 0.031 | Ia     | pre-max  | (3)  
PS18po      | SN 2018axx | 16 45 01.63 |  03 46 02.9  | 2018 04 13 | Pan-STARRS1 | 19.4     | 0.09  | Ia     | +8 to +10|  
            | AT 2018avd | 14 02 51.22 | -04 25 17.5  | 2018 04 15 | PTSS        | 18.4     | 0.047 | ?      | ?        | (4) 
ASASSN-18hg | SN 2018ard | 13 31 19.63 | -33 13 53.6  | 2018 04 08 | ASAS-SN     | 17.5     | 0.05  | Ia     |+11 to +20| (5) 
PS18pe      | SN 2018awx | 14 05 42.98 | -17 23 48.5  | 2018 04 13 | Pan-STARRS1 | 18.4     | 0.032 | II     | ?        | (6) 
PS18pm      | SN 2018axz | 16 29 45.06 |  04 27 46.7  | 2018 04 13 | Pan-STARRS1 | 20.4     | 0.18  | Ia     |+11 to +20|  
ASASSN-18ib | AT 2018ave | 20 22 02.32 | -18 22 59.4  | 2018 04 14 | ASAS-SN     | 17.7     | 0.056 | AGN    | -        |   
ASASSN-18hy | SN 2018aun | 21 31 47.98 | -46 02 30.9  | 2018 04 14 | ASAS-SN     | 16.6     | 0.03  | Ia     |+11 to +20|  
PS18ph      | SN 2018axw | 14:51:40.84 | -15 34 01.7  | 2018 04 13 | Pan-STARRS1 | 19.8     | 0.129 | Ia     |+11 to +20|  
Gaia18axz   | SN 2018auf | 22 17 12.28 | -03:53:33.1  | 2018 04 11 | Gaia        | 18.9     | 0.09  | Ia     |+11 to +20|  

(1) Best match with normal SNe Ia around max. However, the object appears subluminous at M=-18.
(2) Good match with SNe 2002cx, 2012Z, and 2005hk a couple of weeks past max.
(3) see also ATel #11558.
(4) Blue continuum. If associated with GALEXASC J140251.77-042509.3, then M ~ -18.2.
(5) Classified also by the Global SN project (TNS Class. report No 1854).
(6) Host galaxy contaminated. The underlying spectrum is consistent with a Type II.