Spectroscopic Classifications of Optical Transients with the Lick Shane telescope
ATel #10559; C. Rojas-Bravo, E. Xhakaj, Y.-C. Pan, C. D. Kilpatrick, R. J. Foley (UCSC)
on 7 Jul 2017; 04:41 UT
Credential Certification: Yen-Chen Pan (firstname.lastname@example.org)
Subjects: Optical, Supernovae
Referred to by ATel #: 10575
We report the following classifications of optical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope. Targets were supplied by ASAS-SN, ATLAS, Gaia, and POSS. All observations were made on 2017 July 3 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Name | IAU Name | RA (J2000) | Dec (J2000) | z | Type | Phase | Notes
ATLAS17hls | AT2017eww | 14:11:33.07 | +02:28:32.21 | 0.053 | Ia | +3 d | (1)
ASASSN-17ir | AT2017fbr | 15:40:59.69 | +51:26:16.53 | 0.037 | Ia | +8 d |
AT2017fbs | AT2017fbs | 15:23:19.51 | +08:36:58.60 | 0.036 | Ia | -5 d | (2)
Gaia17bqy | AT2017fbv | 12:20:19.90 | +41:36:48.96 | 0.046 | IIn/Ibn | | (3)
When the redshift is given to 2 decimal places, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy.
(1) We measure an Si II 6355 velocity of -10,800 km/s.
(2) We measure an Si II 6355 velocity of -12,800 km/s.
(3) We classify the object as a SN IIn, but with relatively strong He I lines. This is reminiscent of 'transitional' SNe Ibn (e.g., Pastorello et al., 2008, MNRAS, 389, 131).