ePESSTO spectroscopic classification of optical transients

ATel #11509; D. Malesani (DAWN, DARK), A. Rubin (WIS), G. Leloudas (DARK), K. E. Heintz (Univ. Iceland, DAWN), J. Anderson (ESO), K. Maguire (QUB), C. Inserra (Southampton), E. Kankare, S. J. Smartt (QUB), O. Yaron (Weizmann), D. Young (QUB), J. Tonry, L. Denneau, A. Heinze, H. Weiland (IfA, Univ. of Hawaii), B. Stalder (LSST), A. Rest (STScI), K. W. Smith, O. McBrien (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. Wilman (IfA, Univ. of Hawaii)
on 6 Apr 2018; 17:48 UT
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 ATLAS survey, see Tonry et al. (2011, PASP, 123, 58) and Tonry et al. (ATel #8680), the Pan-STARRS Survey for Transients (see Chambers et al. 2016, arXiv:1612.05560, and http://pswww.ifa.hawaii.edu ) and 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 ). All observations were performed on the ESO New Technology Telescope at La Silla on 2018 April 5 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-18ft | SN 2018ajp | 06 27 03.76 | -25 38 23.6 | 2018 03 18 | ASAS-SN     | 17.3     | 0.027 | Ia     | +4 to +7 |  
ASASSN-18gq | AT 2018apl | 13 45 03.48 | -41 52 23.48| 2018 04 03 | ASAS-SN     | 16.5     | 0     | VarStar| -        | (1) 
ASASSN-18gj | AT 2018ang | 14 25 28.34 | -38 18 06.19| 2018 03 28 | ASAS-SN     | 16.9     | 0 ?   | ?      | ?        | (2) 
ATLAS18mmp  | AT 2018ahz | 14 23 50.14 | -09 23 17.57| 2018 02 12 | ATLAS       | 19.2     | 0.069 | AGN    | -        |  
ATLAS18mmo  | SN 2018ahx | 15 10 43.55 | 05 28 51.31 | 2018 03 07 | ATLAS       | 18.67    | 0.074 | Ia     | > +20    | (3) 
PS18jw      | AT 2018ys  | 10 28 37.93 | 06 10 22.09 | 2018 02 21 | Pan-STARRS1 | 20.08    | ?     | ?      | ?        | (4) 
PS18kc      | SN 2018zj  | 14 07 31.91 | -22 09 21.78| 2018 02 27 | Pan-STARRS1 | 18.84    | 0.030 | II     | > +20    | (5) 

(1) Balmer lines are detected in absorption at z = 0. The suggested association with galaxy ESO 325- G011 (see ATels # 11500, # 11501) might be a chance alignment.
(2) Blue continuum. There are possibly Balmer lines in absorption at z=0 but the detection significance is low.
(3) Nuclear transient heavily contaminated by host light. SNID finds matches to SNe Ia a few weeks after maximum. Host redshift obtained from SDSS.
(4) Low S/N. Only one broad feature centered at 5300 A does not allow a secure typing and redshift estimation.
(5) The light curve of this object shows evidence for a plateau between 40-20 days ago (last available photometry) and is therefore consistent with a Type IIP.