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PSN J22550197-3939345 is a peculiar Type Ia supernova

ATel #6134; D. Milisavljevic, J. Parrent, R. Margutti, A. Soderberg (Harvard-Smithsonian Center for Astrophysics), R. Fesen (Dartmouth College), P. Vaisanen (South African Astronomical Observatory and Southern African Large Telescope)
on 14 May 2014; 17:47 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: D. Milisavljevic (dmilisav@cfa.harvard.edu)

Subjects: Supernovae

Low-dispersion spectra (range 330-900 nm), obtained on May 12.1 UT with the 10-m SALT telescope (+ RSS), show PSN J22550197-3939345 to be a peculiar Type Ia supernova. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows similarity to a variety of sub-luminous 1991bg-like events including 2005bl and 2007al approximately 1-3 weeks after maximum light. After removal of the host-galaxy (NGC 7410) redshift of z = 0.0058 (via NED; Lauberts and Valentijn 1989, Surface Photometry Catalogue of the ESO-Uppsala Galaxies), fitting with the SYN++ software (Thomas et al. 2011, PASP 123, 237) suggests that the broadest P-Cyg absorption minima associated with Ca II and O I are blueshifted by approximately 10,000 km/s.