SALT spectroscopic classification of SN 2017erp as a type-Ia supernova well before maximum light
ATel #10490; S. W. Jha, Y. Camacho, K. Dettman (Rutgers), Y.-C. Pan, R. J. Foley (UCSC), A. Rest (STScI), D. Scolnic (Chicago/KICP), R. Skelton (SALT/SAAO)
on 14 Jun 2017; 01:16 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Saurabh Jha (saurabh@physics.rutgers.edu)
Subjects: Optical, Supernovae
We obtained SALT (+RSS) spectroscopy of SN 2017erp (discovered by
K. Itagaki) on 2017 Jun 13.9 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 SN
2017erp is a type-Ia supernova before maximum light. Good SNID matches
are obtained with SN 2003W at -11 days and SN 1990N at -13 days.
Adopting a redshift z=0.006174 (Theureau et al. 2005, A&A, 430, 373;
via NED, and confirmed with superimposed narrow lines in the spectrum)
for the host galaxy NGC 5861, the expansion velocity for SN 2017erp,
measured to the trough of the Si II (rest 635.5 nm) line, is 21,500
km/s.
Our spectrum is posted on the
Transient Name Server SN 2017erp page.
