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ePESSTO spectroscopic classification of optical transients

ATel #11383; S. Taubenberger, A. Floers (ESO), C. Vogl (MPA), S. Benetti, A. Pastorello, E. Cappellaro (INAF-Padova Observatory), J. Anderson (ESO), M. Gromadzki (Warsaw), C. Inserra (Southampton), E. Kankare (QUB), K. Maguire (QUB), M. Sullivan (Southampton), 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)
on 8 Mar 2018; 17:08 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stefano Benetti (stefano.benetti@oapd.inaf.it)

Subjects: Optical, Supernovae

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 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 ) and the ATLAS survey, see Tonry et al. (2011, PASP, 123, 58) and Tonry et al. (ATel #8680). All observations were performed on the ESO New Technology Telescope at La Silla on 2018 March 8, 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-18et | SN 2018aay | 10 32 34.85 | -02 41 18.6  |  2018 03 06.07 |  ASAS-SN  |   17.5 (g)   | 0.030900 |  Ia  | at max | (1) 
ASASSN-18en | SN 2018zz  | 14 03 39.05 | -33 58 42.5  |  2018 03 03.92 |  ASAS-SN  |   16.0 (g)   | 0.013763 |  Ia  | at max | (1) 
ATLAS18mgm  | SN 2018zp  | 16 43 39.77 | +26 35 45.67 |  2018 03 03.92 |  ASAS-SN  |   18.33 (o)  | 0.0605   |  Ia  | at max | (2)

(1) The spectra of ASASSN-18et and ASASSN-18en resemble those of normal type Ia SNe at around maximum light. The expansion velocities inferred from the position of the minimum of the Si II 635.5 nm line are about 10500 km/s and 11000 km/s, respectively.
(2) The spectrum of ATLAS18mgm resembles that of a normal type Ia SN near the maximum light. The redshift of the host galaxy is uncertain. Adopting z=0.0605 from the main SN features as inferred by SNID, we obtain an expansion velocity of about 12600 km/s, as inferred from the position of the minimum of the Si II 635.5 nm line.