Spectroscopic Classifications of Optical Transients with SOAR
ATel #11731; Y.-C. Pan, R. J. Foley (UCSC), S. W. Jha (Rutgers), A. Rest (STScI), D. Scolnic (Chicago/KICP)
on 18 Jun 2018; 18:16 UT
Credential Certification: Yen-Chen Pan (ypan6@ucsc.edu)
Subjects: Optical, Supernovae
We report the following classifications of optical transients from spectroscopic observations with the Goodman spectrograph on the Southern Astrophysical Research (SOAR) telescope. Targets were supplied by the ATLAS and ASAS-SN. All observations were made on 2018 Jun 18 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Name | IAU Name | RA (J2000) | Dec (J2000) | z | Type | Phase | Notes
ATLAS18qlv | AT2018cjy | 12:59:45.30 | -25:36:06.13 | 0.064 | Ia | -6 d | (1)
ASASSN-18mn | AT2018cmt | 23:56:55.72 | -24:59:47.58 | 0.074 | Ia | +8 d |
ATLAS18qjm | AT2018cnv | 22:49:28.00 | -24:23:00.78 | 0.047 | IIn | | (2)
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) We measure a Si II 6355 velocity of -15,600 km/s
(2) The SN appears to be relatively young, consistent with the photometry. The Balmer lines have Lorentzian profiles with FWHM ~ 1500 km/s. There is strong He II 4686 emission.
