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ePESSTO spectroscopic classification of optical transients

ATel #11477; C. Vogl (MPA), A. Floers, S. Taubenberger (ESO), S. Benetti, A. Pastorello (INAF-Padova Observatory), L. Galbany (Pittsburgh), C. Gall (DARK, KU), J. Lyman (Warwick), C. Inserra (Southampton), E. Kankare (QUB), K. Maguire, S. J. Smartt (QUB), O. Yaron (Weizmann), D. R. 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 26 Mar 2018; 17:08 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 supernova classifications. Targets were supplied by the ATLAS survey, see Tonry et al. (2011, PASP, 123, 58) and Tonry et al. (ATel #8680), and M. Villi and the Catalina Real-time Transient Survey (CRTS; Drake et al. 2009, ApJ, 696, 870 ; http://crts.caltech.edu/ ). All observations were performed on the ESO New Technology Telescope at La Silla on 2018 March 26 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     |  Discovery Mag.  |    z     | Type | Phase | Notes 
ATLAS18mia  | SN 2018adj | 13 48 22.80 | +14 52 46.11 | 2018 03 06.59 | ATLAS          | 18.224 (o-ATLAS) | 0.06     |  Ia  | +20 d | (1) 
SNhunt358   | SN 2018ahq | 14 30 24.91 | +11 55 57.36 | 2018 03 17.41 | M. Villi, CRTS | 17.5 (V-CRTS)    | 0.025588 |  Ia  | +2 d  | (2) 
 

(1) The spectrum of ATLAS18mia is similar to that of normal Type Ia SNe about 3 weeks after the B-band maximum light. The redshift of the host galaxy is obtained from the positions of the broad SN features. The expansion velocity of the SN ejecta, as derived from the Si II 635.5 nm feature, is about 10500 km/s. (2) The spectrum of SNhunt358 is that of a normal Type Ia SN soon after the B-band maximum. The expansion velocity of the SN ejecta, as derived from the position of the minimum of the Si II 635.5 nm line, is about 11800 km/s. The redshift of the host galaxy NGC 5644 is from Mhdavi & Geller 2004, ApJ, 607, 202.