Asiago spectroscopic classification of 5 ASASSN SNe
ATel #11558; L. Tomasella, S. Benetti, E. Cappellaro, M. Turatto (INAF-OAPd)
on 22 Apr 2018; 10:38 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Enrico Cappellaro (enrico.cappellaro@oapd.inaf.it)
Subjects: Optical, Supernovae
Referred to by ATel #: 11560
The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic classification of
ASASSN-18ii,ASASSN-18it, ASASSN-18iv, ASASN-18iw, ASASSN-18iu discovered during the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN, Shappee et al. 2014) (Atel #11178).
The observations were performed with the Asiago 1.82 m Copernico Telescope equipped with AFOSC (range 340-820 nm; resolution 1.4 nm).
Survey Name | IAI Name | Discovery date (UT) | Discovery mag | Observation (UT) | Type | z | Notes|
ASASSN-18ii | SN2018avp | 2018-04-16.25 | 17.9 |2018-04-21.81 | Ia | 0.053 | (1) |
ASASSN-18it | SN2018awt | 2018-04-19.92 | 18.1 |2018-04-21.91 | Ia | 0.07 | (2) |
ASASSN-18iv | SN2018ayf | 2018-04-19.97 | 17.2 |2018-04-21.86 | Ia pec | 0.070 | (3) |
ASASSN-18iw | SN2018ayg | 2018-04-21.27 | 18.1 |2018-04-21.95 | Ia | 0.031 | (4) |
ASASSN-18iu | SN2018aye | 2018-04-21.31 | 18.0 |2018-04-21.99 | Ia | 0.017 | (5) |
(1) Type Ia SN about one week after maximum light. The velocity of the ejecta, as measured from SiII 635.5 nm, is 11700 km/s, assuming a redshift of 0.052717 for the host galaxy SDSS J130026.83+183711.1 (Almeida et al. 2011, ApJ 735, via NED).
(2) The very noisy spectrum is consistent with that of Type Ia SNe around maximum light at redshift 0.07.
(3) the noisy spectrum matches those of peculiar SNe Ia, eg. SN1991T but also SN2000cx, around maximum light.
The redshift of the host galaxy SDSS J094110.41+240122.2 is from SDSS-DR12.
(4) The spectrum, after subtracting the strong contamination from the host galaxy nucleus, matches Type Ia SN 6-10 days before maximum. The redshift of the host galaxy, 2MASX J14433925+1852124, is from SDSS-DR12.
(5) The spectrum matches those of with Type Ia SN about ten days before maximum light. The velocity of the ejecta, as measured from SiII 635.5 nm, is around 12600 km/s, assuming a redshift of 0.017 as derived from SNID SN template fitting.