CRTS transients spectroscopic classification
ATel #4599; T. Fatkhullin, M. Gabdeev (SAO RAS)
on 22 Nov 2012; 12:46 UT
Credential Certification: Sergei Fabrika (fabrika@sao.ru)
Subjects: Optical, Supernovae
We observed the CRTS (Drake et al. 2009, ApJ, 696, 870)
SNe candidates with the Russian 6-meter telescope at the
Northern Caucasus (+SCORPIO, spec. range 3800-8500AA,
spec. resolution FWHM=7A). The results are presented in
the following table:
| CRTS ID | Date, UT | Type |
redshift | host galaxy lines |
| CSS121106:003304+312335 | 15.836 Nov | Ia |
0.14 | Halpha, Hbeta? |
| CSS121112:024457+353043 | 15.903 Nov | Ia |
0.041 | Halpha |
| MLS121104:021643+204009 | 15.865 Nov | Ic
| 0.303 | [OII]3727A, Hgamma |
| | | | | Hbeta, [OIII]4959,5007AA |
For the first two objects the classification was performed
using the correlation method of the SNID software
(Blondin & Tonry, 2007, ApJ 666, 1024). These object are
close matched to the
SN1994ae and
SN2003du, respectively,
near the maximum of its light curves. The nearby galaxy, ~3 arcsec
to the North-West from CSS121106, has the redshift of 0.064
according to the detection of the Balmer and [OIII]4959,5007AA
emission lines and, thus, it is not a host galaxy of the CSS121106
supernova. The classification of the MLS121104:021643+204009 was done
using the GELATO on-line service (Harutyunyan et al., 2008, A&A,
488, 383; https://gelato.tng.iac.es). It is shown that the object
is close matched to the peculiar Type Ic supernova
SN2003jd near
its light curve maximum. We pay attention to the fact that for
the measured redshift the absolute magnitude of the MLS121104 at
its maximum is M <= -21.3 and, thus, the object belongs to the
class of superluminous events (e.g. see the definition of A. Gal-Yam,
Science, 2012, 337, 927).
