ePESSTO spectroscopic classification of optical transients
ATel #11969; E. Callis (UCD), Z. Kostrzewa-Rutkowska (SRON/RU), M. Fraser (UCD), J. Anderson (ESO), L. Galbany (U. Pitt), T.-W. Chen (MPE), C. Inserra (Southampton), E. Kankare (QUB), K. Maguire (QUB), S. J. Smartt (QUB), O. Yaron (Weizmann), D. R. Young (QUB), I. Manulis (Weizmann), 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)
on 19 Aug 2018; 16:24 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Morgan Fraser (morgan.fraser@ucd.ie)
Subjects: Optical, Supernovae, Transient
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 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 ESA Gaia Photometric Science Alerts Team and DPAC (http://gsaweb.ast.cam.ac.uk/alerts); and the Zwicky Transient Factory (https://www.ztf.caltech.edu/). All observations were performed on the ESO New Technology Telescope at La Silla on 2018 August 18, 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-18su | AT2018fez | 12:57:51.3 | -28:30:16.8 | 20180817 | ASASSN | 10.1 | 0 | CV | - |
ASASSN-18rp | AT2018evv | 13:37:39.1 | -29:08:06.0 | 20180811 | ASASSN | 17.3 | 0.018 | ? | ? | (1)
ATLAS18tvk | SN2018fel | 16:52:31.2 | 23:23:00.7 | 20180817 | ATLAS | 19.0 | 0.1 | Ia | -2d |
ZTF18abmxahs| SN2018feb | 17:10:11.2 | 21:38:56.5 | 20180816 | ZTF | 19.3 | 0.015 | Ia | -11d | (2)
Gaia18ceq | AT2018fcr | 16:16:42.8 | 04:12:28.3 | 20180813 | Gaia | 15.6 | 0.091 | AGN | - |
ASASSN-18sv | SN2018ffb | 22:58:11.5 | -20:17:02.8 | 20180817 | ASASSN | 17.9 | 0.07 | Ia | +4d |
ATLAS18txa | AT2018ffd | 00:19:06.1 | -25:57:35.1 | 20180817 | ATLAS | 18.5 | 0 | Mstar | - |
ATLAS18twn | SN2018few | 01:04:15.5 | -42:44:28.1 | 20180817 | ATLAS | 18.6 | 0.066 | Ia | -3d | (3)
ASASSN-18st | SN2018fey | 01:22:19.5 | -02:29:48.6 | 20180818 | ASASSN | 17.9 | 0.06 | Ia | +3d |
ASASSN-18ss | SN2018fex | 03:55:20.9 | -56:45:13.0 | 20180817 | ASASSN | 17.8 | 0.024 | IIb | ~0d |
ATLAS18tec | SN2018ffj | 02:30:59.8 | -17:20:26.9 | 20180807 | ATLAS | 18.0 | 0.234 | SLSN-I | ~0d | (4)
(1) Spectrum of transient appears blue and featureless, aside from narrow lines likely associated with the host.
(2) Discovered also by ATLAS as ATLAS18tvh.
(3) Best matching templates are 91T-like.
(4) ATLAS18tec was observed as part of the GREAT survey (Chen et al. 2018arXiv180804382C). It had a black body temperature of T_BB ~ 12700 +/- 500 K, obtained from photometry taken on 15.08.2018 with g=17.94, r=18.11, i=18.31, z=18.41 mag, calibrated against SDSS field stars. The spectrum matches that of PTF12dam around peak, implying an absolute magnitude of ~ -22.