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).