ePESSTO spectroscopic classification of optical transients
ATel #12223; E. Congiu (Padova), M. Berton (FINCA), A. Reguitti (Padova), A. Pastorello (Padova), S. Benetti (Padova), T-W. Chen (MPE), R. Cartier (CTIO), C. Inserra (Southampton), E. Kankare (QUB), K. Maguire (QUB), S. J. Smartt (QUB), D. R. Young (QUB), O. Yaron (Weizmann), I. Manulis (Weizmann), J. Tonry (IfA, Univ. of Hawaii), L. Denneau (IfA, Univ. of Hawaii), A. Heinze (IfA, Univ. of Hawaii), H. Weiland (IfA, Univ. of Hawaii), B. Stalder (LSST), A. Rest (STScI), K. W. Smith (QUB), O. McBrien (QUB), D. E. Wright (Univ. of Minnesota)
on 17 Nov 2018; 13:24 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Andrea Pastorello (andrea.pastorello@oapd.inaf.it)
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 classifications. Targets are supplied by the ATLAS survey (see Tonry et al. (2011, PASP, 123, 58) and Tonry et al., ATel #8680).
Information on the targets was taken from the IAU TNS list (see https://wis-tns.weizmann.ac.il/).
All observations were performed with the ESO New Technology Telescope at La Silla on 2018 November 17 (UT), equipped with 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).
The 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 | Discovery Mag. | z | Type | Phase | Notes
ATLAS18yip | SN 2018ids | 21:16:11.36 | +11:56:46.45 | 2018-11-05.31 | ATLAS | 19.18 (c-ATLAS) | 0.036 | Ia | at max | (1)
ATLAS18ysc | SN 2018ihx | 01:10:44.20 | -00:55:00.85 | 2018-11-08.44 | ATLAS | 19.55 (c-ATLAS) | 0.144 | Ia | at max | (2)
(1) The spectrum of SN 2018ids, obtained on 2018-11-17.04 UT, is that of a Type Ia SN at around the maximum light. The expansion velocity, inferred from the
wavelength of the Si II 635.5 nm line minimum, is 10700 km/s. The host galaxy redshift is obtained by matching the SN features with Type Ia SN templates.
(2) The noisy spectrum of SN 2018ihx, obtained on 2018-11-17.07 UT, is that of a Type Ia SN a few days after the B-band light curve peak. The expansion
velocity of the ejecta, as inferred from the minimum of the Si II 635.5 nm line, is about 10700 km/s. The host galaxy redshift is obtained from the position
of the SN spectral features.
