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Lick/Kast Spectroscopy Confirms PTF11kly is a Type Ia Supernova

ATel #3583; S. B. Cenko (UC Berkeley), R. C. Thomas, P. E. Nugent (LBNL), M. Kandrashoff, A. V. Filippenko, and J. M. Silverman (UC Berkeley) report on behalf of a larger collaboration:
on 25 Aug 2011; 09:47 UT
Credential Certification: S. Bradley Cenko (cenko@astro.berkeley.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 3584

We have obtained a low-resolution spectrum of the supernova PTF11kly in the nearby galaxy M101 (ATEL #3581) with the Kast spectrograph mounted on the 3 m Shane telescope at Lick Observatory. The spectrum was obtained on Aug 25.17 and covers the wavelength range from 3500-10000 A. We confirm the preliminary classification as a young type Ia SN based on the detection of broad, blueshifted Si II and Ca II absorption lines, as well as a lack of Balmer features (either in emission or absorption). After correcting for a host galaxy recession velocity of 241 km/s, we find that the minimum of the Si II 6355 line is blueshifted by ~ 16500 km/s. C II 6580 and (possibly) 7234 are also detected with slightly lower (~ 14500 km/s) relative velocities.