Spectroscopic Classifications of Optical Transients with Mayall/KOSMOS
ATel #9129; Y.-C. Pan, R. J. Foley (Illinois), S. W. Jha (Rutgers), A. Rest (STScI), D. Scolnic (Chicago/KICP)
on 9 Jun 2016; 02:04 UT
Credential Certification: Yen-Chen Pan (ycpan@illinois.edu)
Subjects: Optical, Nova, Supernovae, Variables
We report the following classifications of optical transients from spectroscopic observations with KOSMOS on the KPNO Mayall 4-m telescope. Targets were supplied by the Pan-STARRS Survey for Transients (PSST), All-Sky Automated Survey for Supernovae (ASAS-SN) and MASTER. All observations were made on 2016 June 7 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Name | RA (J2000) | Dec (J2000) | z | Type | Phase | Notes
MASTEROTJ83637.5+733504.8 | 08:36:37.5 | +73:35:04.8 | 0.012 | IIn | | (1)
ASASSN-16fs | 14:47:06.38 | +11:35:41.92 | 0.029 | Ia | +3 d | (2)
PS16cqa | 15:39:07.00 | +09:17:40.50 | 0.044 | Ia-91bg | -1 d | (3)
PS16cow | 15:54:12.32 | +14:36:23.10 | 0.006 | | | (4)
PS16cqb | 21:04:12.61 | -25:03:28.60 | 0.053 | II | | (5)
Notes:
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) The SN is young and similar to SN 1998S right after explosion (e.g., Shivvers et al., ApJ, 806, 213).
We measure a FWHM of 350 km/s for H alpha. We clearly detect narrow He II 4686 and there may be fainter narrow lines as well.
(2) We measure a Si II 6355 velocity of -11,500 km/s.
(3) We measure a Si II 6355 velocity of -10,700 km/s.
(4) Given its current luminosity (M_r=-11.1 mag, see ATEL #9106), PS16cow is likely to be a nova or LBV outburst. We measure a FWHM of 5,000 km/s for the broad H-alpha component in the spectrum.
(5) We measure a H-alpha velocity of -6,500 km/s.
