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Classifications of Three ASAS-SN Supernovae

ATel #10014; M. R. Drout (Hubble Fellow, Carnegie Observatories), T. W.-S. Holoien (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories)
on 27 Jan 2017; 21:55 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Holoien (tholoien@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

We report the classifications of ASASSN-17ap, ASASSN-17bb, and ASASSN-17bd using the du Pont 2.5-m telescope (+ WFCCD) at Las Campanas Observatory. The spectrum for ASASSN-17bb was obtained on UT 2017-01-26 and the spectra for ASASSN-17ap and ASASSN-17bd were obtained on UT 2017-01-27. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that all three transients are post-maximum Type Ia supernovae. Best-fit classifications, ages, and redshifts from SNID are reported in the table below:

 
Object          Disc. UT Date	       Classification         Redshift        Phase      Notes 
ASASSN-17ap	2017-01-03.11		     Ia			0.045	      +14 d	 
ASASSN-17bb	2017-01-23.65		     Ia			0.037	      +5 d        (1) 
ASASSN-17bd	2017-01-23.61		     Ia			0.035	      +7 d	  (2) 

(1) The classification of ASASSN-17bb is consistent with that reported in ATel #10012.

(2) The redshift of ASASSN-17bd is consistent with that of the host galaxy (0.034554). ASASSN-17bd also shows good matches with 1991T-like Type Ia supernovae at similar ages.