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Spectroscopic Classification of ASASSN-14eu as a Peculiar Type Ia Supernova

ATel #6363; D. Milisavljevic, J. Parrent, R. Margutti, A. Kamble, M. Drout, A. Soderberg, D. Patnaude (Harvard-Smithsonian Center for Astrophysics)
on 2 Aug 2014; 18:13 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: D. Milisavljevic (dmilisav@cfa.harvard.edu)

Subjects: Optical, Supernovae

A low resolution (R ~ 2000) optical spectrum (range 4000-9400 Angstroms) of ASASSN-14eu (ATel #6360) was obtained August 2.1 UT with the Walter Baade Magellan 6.5m telescope (+ IMACS) at Las Campanas Observatory. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows the transient to be consistent with a Type Ia supernova at the redshift of PGC 053612 (z = 0.02272; Jones et al. 2009, 6dF Galaxy Survey Data Release 3; via NED). The best subtype determined by SNID is SN 2000cx, which was a peculiar event that, similar to ASASSN-14eu, also exploded in the outskirts of its host galaxy. SN 2013bh is another example of this rare type of explosion (Silverman et al. 2013, MNRAS, 436, 1225). Comparison between our data of ASASSN-14eu to those of SN 2000cx around the time of maximum light published in Li et al. (2001, PASP, 113, 1178) and retrieved via WISEREP (Yaron & Gal-Yam 2012, PASP, 124, 668) substantiates the likeness between the two supernovae. However, similarity to SN 1999aa (Garavini et al., 2004, AJ, 128, 387) at pre-maximum light phases is also seen. Additional observations are encouraged.