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Spectroscopic Classifications of Optical Transients with SOAR

ATel #11009; Y.-C. Pan, C. Rojas-Bravo, R. J. Foley (UCSC), S. W. Jha (Rutgers), A. Rest (STScI), D. Scolnic (Chicago/KICP)
on 26 Nov 2017; 20:41 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 ASAS-SN and ATLAS. All observations were made on 2017 Nov 26 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name        | IAU Name  | RA (J2000)  | Dec (J2000)  | z     | Type | Phase |  Notes
ATLAS17nhp | AT2017ijn | 09:41:30.91 | -11:11:58.16 | 0.05 | IIn | | (1) ASASSN-17pp | AT2017ilf | 09:16:44.88 | +18:57:16.09 | 0.030 | Ia | -1 | (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) Blue continuum with strong, relatively narrow Balmer emission lines. For H beta, we measure two components withs FWHMs of 400 and 2300 km/s, respectively. At z = 0.048 (as measured from the center of the emission lines), the object has M ~ -18.7 mag, making it a likely SN rather than an LBV outburst despite some spectral similarities to LBV outbursts such as SN 2009ip. (2) We measure a Si II 6355 velocity of -11,100 km/s.