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Du Pont Classification of ASASSN-15mq, ASASSN-15ng, and ASASSN-15ox

ATel #8031; Benjamin J. Shappee (Hubble Fellow, Carnegie Observatories), Jose L. Prieto (Diego Portales; MAS), Mark Seibert (Carnegie Observatories), Evelyn Johnston (ESO)
on 10 Sep 2015; 06:18 UT
Credential Certification: Benjamin Shappee (bshappee@obs.carnegiescience.edu)

Subjects: Optical, Supernovae

We report on optical spectroscopy (range 370-910 nm) from the du Pont 2.5-m telescope (+ WFCCD) at Las Campanas Observatory of ASASSN-15mq, ASASSN-15ng, and ASASSN-15ox obtained on Sept. 8.4 UT, Sept. 9.0 UT, and Sept. 9.4 UT, respectively.

ASASSN-15mq was discovered (ATel #7810) approximately 2.8" South and 5.7" West from the center of the galaxy 2MASX J05014660-1343503 (z=0.024944, d=104 Mpc, via NED). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates the spectrum of ASASSN-15mq is a normal Type Ia 34.0 (15.1) days after maximum brightness with z=0.028(0.003). The best-fit template SNe were the 1998aq (at +49.8 days) and 2002fk (at +44.0 days). These epochs are roughly consistent with the discovery and photometry reported in ATel #7810.

ASASSN-15ng was discovered (ATel #7840) approximately 27.0" North and 8.5" West from the center of the galaxy ESO 221-G012 (z=0.00984, d=43.8 Mpc, via NED). Cross-correlation with a library of supernova spectra using SNID indicates the spectrum of ASASSN-15ng is a Type IIP 17.2 (48.0) days after maximum brightness with z=0.011(0.006).

ASASSN-15ox was discovered (ATel #7961) approximately 3.95" North and 17.7" West from the center of the galaxy LSBG F418-058 (z=0.046499, d=196 Mpc, via NED). Cross-correlation with a library of supernova spectra using SNID indicates the spectrum of ASASSN-15ox is a normal Type Ia 12.4 (27.3) days after maximum brightness with z=0.046(0.005). The best-fit template SNe were the 2008bf (at +13.3 days) and 1998bu (at +11.4 days). These epochs are consistent with the discovery and photometry reported in ATel #7961.