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.
