SALT spectroscopic classification of ASASSN-18tb (= SN 2018fhw) as a type-Ia supernova at maximum light
ATel #11980; Y. Eweis, S. W. Jha, Y. Camacho, M. Dai, K. Dettman (Rutgers), M. Kotze (SALT/SAAO)
on 23 Aug 2018; 17:25 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Saurabh Jha (saurabh@physics.rutgers.edu)
Subjects: Optical, Supernovae
Referred to by ATel #: 12820
We obtained SALT (+RSS) spectroscopy of ASASSN-18tb (= SN 2018fhw; ATel #11976) on 2018 August 23.3 UT, covering the wavelength range 350-940 nm. Cross-correlation of the supernova spectrum with a template library using SNID (Blondin & Tonry 2007, ApJ, 666, 1024) shows a good match to the type-Ia SN 2003iv at +1 day after maximum light. We also placed the longslit through the nucleus of the host galaxy 2MASX J04180598-6336523 and derive a heliocentric redshift of 5090 +/- 30 km/s using cross-correlation with galaxy templates. The expansion velocity of the supernova (measured to the trough of the Si II rest 635.5 nm line) is approximately 9,980 km/s. Given the location of ASASSN-18tb in the TESS Sector 1 field, continued follow-up observations of this supernova are encouraged.
Our spectrum is posted on the Transient Name Server SN 2018fhw page.
