DuPont spectroscopy reveals ASASSN-19nb (SN 2019fmr) and ASASSN-19nd (SN 2019fpc) are type-Ia supernovae
ATel #12792; M. Stritzinger, S. Holmbo (Aarhus), N. Morrell (LCO), P. Chen, S. Bose, S. Dong (KIAA-PKU), P. J. Vallely (OSU)
on 22 May 2019; 14:13 UT
Credential Certification: maximilian stritzinger (max@phys.au.dk)
Subjects: Optical, Supernovae
We report spectra (range 380-924 nm) obtained of ASASSN-19nb (SN 2019fmr) and ASASSN-19nd (SN 2019fpc) with the Las Campanas Observatory DuPont telescope (+ WFCCD) on May 22.3 and 22.4 UT, respectively. The spectrum of ASASSN-19nb (SN 2019fmr) indicates it is a pre-maximum type-Ia supernova. Comparison with a library of supernova spectra (SNID; Blondin and Tonry 2012, ApJ, 666, 1024) provides very good matches with a number of 1991T/1999aa-like supernovae several days before maximum and computes a redshift z=0.026. Inspection of the spectrum of ASASSN-19nd (SN 2019fpc) reveals it is a normal type-Ia supernova around maximum light, and SNID computes a redshift z=0.037. From the minimum of the Si-II (rest 635.5-nm) absorptions, we compute expansion velocities of -10,200 km/s for ASASSN-19nb (SN 2019fmr) and -11,000 km/s for ASASSN-19nd (SN 2019fpc).
