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Spectroscopic classification of Gaia Alerts with the Liverpool Telescope

ATel #7152; H. Campbell, M. Fraser, S. Hodgkin (IoA), C. Davis (LJMU), Z. Kostrzewa-Rutkowska (Warsaw University Observatory), A. S. Piascik, I. A. Steele (LJMU), L. Wyrzykowski (Warsaw University Observatory)
on 27 Feb 2015; 15:17 UT
Credential Certification: Morgan Fraser (mf@ast.cam.ac.uk)

Subjects: Supernovae, Transient

We report spectroscopic classifications of transients identified as part of the Gaia Science Alerts project (Hodgkin et al. 2013, Royal Soc. Philosophical Trans. Series A, 371, 20239 ; Wyrzykowski 2014, IAU Symposium, 298, 446). Spectra were taken with the SPRAT spectrograph on the Liverpool Telescope, La Palma, and cover the wavelength range 400-800 nm with resolution R~350. Classifications were made using the SuperNova IDentification code (SNID; Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name      | RA (J2000) | Dec (J2000) | Disc. Date  | Disc Mag | Spec. Date |  z   | Type  | Phase       | Notes 
Gaia15aal | 245.76243  | 37.92130    | 20150109    | 17.13    | 20150204   | -    | Gal?  |             | (1) 
Gaia15aap | 231.71731  | 20.62390    | 20150112    | 18.52    | 20150204   | 0.05 | SN Ia | +2 wks      |  
Gaia15aau | 188.35762  | 40.74319    | 20150206    | 18.15    | 20150212   | 0.03 | SN II | mid plateau | (2)  
Gaia15abb | 240.69715  | 53.55655    | 20150205    | 18.20    | 20150214   | 0.07 | SN Ia | +1 wk       |  
Gaia15ace | 254.83222  | 29.94392    | 20150212    | 17.64    | 20150226   | 0.04 | SN Ia | +2 wks      | 

(1) Spectrum consists of galaxy light only. (2) Broad Type II SN features. Halpha has a clear P-Cygni absorption trough at 7500 km/s, consistent with a normal Type IIP SN mid plateau.

We acknowledge ESA Gaia (http://cosmos.esa.int/gaia), DPAC (cosmos.esa.int/web/gaia/dpac) and the DPAC Photometric Science Alerts Team (http://gaia.ac.uk/selected-gaia-science-alerts).