ePESSTO spectroscopic classification of optical transients
ATel #11939; Z. Kostrzewa-Rutkowska (SRON/RU), E. Callis (UCD), R. Stein (HU Berlin/DESY), M. Fraser (UCD), J. Lyman (Warwick), 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, D. E. Wright (Univ. of Minnesota)
on 11 Aug 2018; 17:12 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); from the ESA Gaia Photometric Science Alerts Team and DPAC (http://gsaweb.ast.cam.ac.uk/alerts); 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 August 10, 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
ATLAS18sss | SN2018efm | 13:32:50.50 | +07:18:39.2 | 20180728 | ATLAS | 17.4 | 0.03 | Ia | +5d | (1)
ATLAS18sxh | AT2018eon | 14:17:27.52 | -24:46:49.8 | 20180803 | ATLAS | 19.4 | - | CV | - |
ATLAS18tgi | SN2018esq | 23:29:38.76 | -25:10:25.4 | 20180807 | ATLAS | 19.4 | 0.13 | Ia | ~0d |
- | AT2018esj | 23:17:53.89 | -04:40:57.0 | 20180806 | TNS | 16.8 | - | - | - | (2)
ATLAS18svs | SN2018emt | 22:10:35.52 | -27:15:00.5 | 20180801 | ATLAS | 16.7 | 0.024 | II | +10d | (3)
(1) Also known as Gaia18bzq.
SN2018efm is offset from its apparent host by ~60 kpc.
(2) Not visible on acquisition image, consistent with comment on TNS that this is a known asteroid (2000FX94).
(3) Also known ASASSN-18qk.
SN2018emt was previously classified by ePESSTO as a blue and featureless transient (ATel #
11909). The spectrum from Aug 10 is still very blue, but now shows shallow broad Halpha and beta, along with additional absorption features in the blue consistent with a young (albeit quite bright) Type II SN.