Spectroscopic classification of Gaia Alerts
ATel #7177; H. Campbell, M. Fraser, S. T. Hodgkin, S. Koposov, N. Blagorodnova (University of Cambridge), L. Wyrzykowski, Z. Kostrzewa-Rutkowska (Warsaw University Observatory), P. Jonker, T. Wevers (University Nijmegen/SRON), M. A.P. Torres (ESO), S. Van Velzen (Johns Hopkins)
on 5 Mar 2015; 09:53 UT
Credential Certification: Morgan Fraser (mf@ast.cam.ac.uk)
Subjects: AGN, Cataclysmic Variable, Quasar, Supernovae
We report low to intermediate resolution optical spectra of candidate transients. obtained with the William Herschel Telescope + ISIS + R300B/R158R on the nights of 2015 February 28 and March 1.
Candidates were identified as part of the Gaia Photometric Science Alerts project (http://gaia.ac.uk/selected-gaia-science-alerts).
Name | Type | z | Phase | Notes
GAIA15AAI | AGN | 0.26 | | (1)
GAIA15AAM | SN Ibc | 0.05 | +1 month |
GAIA15AAN | CV | 0 | | (2)
GAIA15AAR | SN Ia | 0.06 | 1-2 months | (3)
GAIA15AAT | CCSN | 0.05 | | (4)
GAIA15AAV | SN II? | 0.13? | ? | (5)
GAIA15ABC | SN I | 0.09 | ? | (6)
GAIA15ABJ | QSO | 1.0 | | (7)
GAIA15ABZ | SN II | 0.03 | mid-plateau | (8)
GAIA15ACF | SN Ia | 0.07 | +2 weeks |
GAIA15ACG | SN II | 0.02 | mid-plateau | (9)
GAIA15ACH | SN Ia | 0.06 | +1 week |
(1) Lorentzian profile Balmer emission, with FWHM 5600 km\s, consistent with a Seyfert I galaxy.
(2) Double peaked H and He emission, consistent with a CV at high inclination. The emission peaks for each line are at +/- ~750 km/s, we see no sign of He 4686. aka ASASSN-14mo, TCP J16054809+2405338
(3) aka CSS150118-133209+344127
(4) Spectrum is that of a core-collapse SN at the nebular phase. aka PS1-14jb
(5) Narrow emission line consistent with Halpha at z=0.13. There is also a possible broad Halpha emission at ~7500 Ang, which is partially contaminated by telluric absorption. The absolute magnitude of the transient in this case is -20.3.
(6) Weak broad features consistent with a SN detected at low S/N. The redshift is from narrow galaxy emission lines.
(7) QSO, aka [HB89] 1205-008.
(8) aka iPTF15jg, ATel #7112
(9) aka CSS150120-053013-165338 is -20.3.
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).
