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Spectral classification of AT2017acd as a type Ia supernova

ATel #10077; Nidia Morrell, Mark Phillips (Las Campanas Observatory, Carnegie Observatories) and Eric Hsiao (Florida State University)
on 14 Feb 2017; 17:29 UT
Credential Certification: Nidia Morrell (nmorrell@lco.cl)

Subjects: Optical, Supernovae

We report an optical spectrum (range 420-930 nm) of AT2017acd obtained on February 13.2 UT with the 6.5m Magellan I Baade telescope (+IMACS) at Las Campanas Observatory. AT2017acd was discovered by Stuart Parker (BOSS collaboration) on Feb. 2, 2017 at an unfiltered magnitude of 17.3. The spectrum shows features characteristic of a type Ia supernova near maximum light. Cross correlation with a library of supernova spectra via the 'Supernova Identification' tool (SNID, Blondin and Tonry 2007, ApJ 666, 1024) yields good matches with several normal type Ia supernovae around a week past maximum light. Adopting for the host galaxy PGC 612475 the NED recession velocity of 9606 km/s (z = 0.032042) we find the minimum of the Si II 635.5 nm absorption to be blueshifted by approximately 12000 km/s.