Spectroscopic Classification of ASASSN-14bb
ATel #6158; M. Fausnaugh, B. J. Shappee, T. W.-S. Holoien (Ohio State), M. Li (Columbia), K. Z. Stanek, C. S. Kochanek, J. Jencson, U. Basu, A. B. Davis, J. F. Beacom (Ohio State), J. L. Prieto (Princeton), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), J. Brimacombe (Coral Towers Observatory), D. Bersier (LJMU)
on 21 May 2014; 20:11 UT
Credential Certification: Benjamin Shappee (shappee@astronomy.ohio-state.edu)
Subjects: Optical, Supernovae
We have obtained a medium-resolution optical spectrum (range 4300-5700 Angstroms) of ASASSN-14bb (ATel #6152) on UT 2014 May 21.14 through a 5" slit with the CCDS spectrograph mounted on the MDM 1.3m telescope. The spectrum shows features characteristic of Type Ia SNe. We used SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) to perform cross-correlation with a library of SN spectra and found that the spectrum of ASASSN-14bb is most consistent with a normal SN Ia at or just before peak. The best-fit redshift for the supernova is z=0.022 +/- 0.005. This is 1.5 sigma below the PhotZ of the host galaxy of 0.061 +/- 0.024 from SDSS.
Our spectra also showed narrow emission lines corresponding to [O III] 5007 and H-beta redshifted by z=0.023 (consistent with our best-fit redshift). Using the discovery magnitude of V ~ 16.0 mag (ATel #6152) and this redshift, we estimate an absolute magnitude V mag of approx. -19.0 (m-M=34.92, A_V=0.042, Schlafly & Finkbeiner 2011).
