Spectroscopic Classification of ASASSN-18dv (SN 2017yj) and ASASSN-18dm (SN 2017yc) as type Ia supernovae
ATel #11369; Jujia Zhang (YNAO) and Xiaofeng Wang (THU)
on 28 Feb 2018; 19:25 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ju-Jia Zhang (jujia@ynao.ac.cn)
Subjects: Optical, Supernovae
Referred to by ATel #: 11372
We report the following spectroscopic classifications for the transients detected by the All Sky Automated Survey for SuperNovae (ASAS-SN), i.e., ASASSN-18dv/SN 2017yj (ATel#11368) and ASASSN-18dm/SN 2017yc (ATel#11343). All the spectra were obtained on UT 2018 Feb.28.5 - Feb.28.7 with the 2.4-m telescope (+YFOSC) at Lijiang Observatory of Yunnan Observatories. Based on the spectral comparison tools SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) the classifications were given as:
(1) The spectrum of ASASSN-18dv/SN 2017yj matches with the normal type Ia supernova SN 2007ca at t = +3 days relative to the maximum light. Given a redshift of 0.035 (from the SNID fit) for its host galaxy, an expansion velocity of about 10300 km/s can be deduced from the Si II 635.5 absorption minimum;
(2) The spectrum of ASASSN-18dm/SN 2017yc matches with the normal type Ia supernova SN 1999ek at t = +3 days relative to the maximum light. Given a redshift of 0.035 (from the SNID fit) for its host galaxy, an expansion velocity of about 10000 km/s can be deduced from the Si II 635.5 absorption minimum.
