ePESSTO spectroscopic classification of optical transients
ATel #11388; A. Floers, S. Taubenberger (ESO), C. Vogl (MPA), S. Benetti, A. Pastorello, E. Cappellaro (INAF-Padova Observatory), M. Berton, E. Congiu (Padova University), 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 9 Mar 2018; 15:51 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 9, 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-18ew | SN 2018aca | 10 22 50.69 | +14 03 16.6 | 2018 03 07.17 | ASAS-SN | 17.1 (g-Sloan) | 0.041680 | Ia | at max | (1)
ATLAS18mit | SN 2018abz | 10 20 08.05 | -06 37 33.8 | 2018 03 07.35 | ATLAS | 18.46 (o-ATLAS) | 0.054858 | Ia | near max | (2)
ATLAS18mis | SN 2018aby | 14 07 00.22 | -15 15 35.0 | 2018 03 07.61 | ATLAS | 17.42 (o-ATLAS) | 0.035418 | Ia | at max | (3)
ASASSN-18ex | SN 2018abo | 11 51 59.92 | +09 42 12.4 | 2018 03 07.30 | ASAS-SN | 18.2 (g-Sloan) | 0.050850 | Ic | before max | (4)
(1) The spectrum of ASASSN-18ew matches that of a normal Type Ia SN at about the B-band maximum light.
The expansion velocity of the SN ejecta, as inferred from the position of the minimum of the Si II 635.5 nm line, is about
11000 km/s. The redshift of the host galaxy, SDSS J102250.88+140316.5 is from the Sloan Digital Sky Survey Data Release 13 (2016).
(2) The spectrum of ATLAS18mit resembles that of the Type Ia SN 1998bu at -2 days from the maximum light.
The expansion velocity of the SN ejecta, as inferred from the position of the minimum of the Si II 635.5 nm line, is about
10700 km/s. The redshift of the host galaxy, LCRS B101737.6-062228, is from Katgert et al. 1998, A&AS, 129, 399, and well
matches the value we obtain from the narrow Halpha line observed in the spectrum.
(3) The spectrum of ATLAS18mis is very similar to that of the classical Type Ia SN 1989B at 1 day after the maximum light.
The expansion velocity of the SN ejecta, as inferred from the position of the minimum of the Si II 635.5 nm line, is about
10100 km/s. The redshift of the host galaxy 2MASX J14070003-1515246 is obtained from the 6dF Galaxy Survey Data Release 3
(Jones et al. 2009).
(4) The spectrum of ASASSN-18ex resembles that of the Type Ic SN 2005az (Modjaz et al. 2014, AJ, 147, 99) at 5 days
before the maximum light. The ejecta velocity, inferred from the minimum of the Si II 635.5 nm feature, is about 11300 km/s.
The redshift of the host galaxy, 2MASX J11515984+0942111, is given by Argudo-Fernandez et al. 2015, A&A, 578, 110.
