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Spectroscopic Classification and Confirmation of ASASSN-14lu and ASASSN-14lo as SNe Ia

ATel #6812; B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, A. B. Davis, G. Simonian, U. Basu, N. Goss, J. F. Beacom (Ohio State), D. Bersier (LJMU), J. Brimacombe (Coral Towers Observatory), Subo Dong (KIAA-PKU), P. R. Wozniak (LANL), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), E. Conseil (Association Francaise des Observateurs d'Etoiles Variables), S. Kiyota (Variable Star Observers League in Japan), J. Nicolas (Groupe SNAUDE, France)
on 13 Dec 2014; 00:01 UT
Credential Certification: Benjamin Shappee (shappee@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae

We have obtained a low-resolution optical spectrum (range 3500-9600 Angstroms) of ASASSN-14lu (ATel #6803) on UT 2014 Dec 12.54 with the DIS mounted on the APO 3.5m telescope. The spectrum shows features characteristic of Type Ia SN. We used SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) to perform cross-correlation with a library of SN spectrum and find that ASASSN-14lu spectrum is most consistent with a normal SN Ia caught after max, but the uncertainty returned on the age is large. The best-fit redshift for the supernova is z=0.026 +/- 0.005. This is consistent with the redshift of the host galaxy of 0.026995 from NED.

We have also obtained a low-resolution optical spectrum (range 3500-9600 Angstroms) of ASASSN-14lo (ATel #6794) on UT 2014 Dec 12.53 with the DIS mounted on the APO 3.5m telescope. The spectrum shows features characteristic of Type Ia SN. We used SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) to perform cross-correlation with a library of SN spectrum and find that ASASSN-14lo spectrum is most consistent with a normal SN Ia caught near max, which is consistent with the FLOYDS Classification (ATel #6811). The best-fit redshift for the supernova is z=0.020 +/- 0.006. This is consistent with the redshift of the host galaxy of 0.019930 from NED.

Continued observations are encouraged.