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Spectroscopic Classification of five optical transients with MDM

ATel #12199; Subhash Bose, Subo Dong, P. Chen (KIAA-PKU), J. Rupert (MDM Observatory), K. Z. Stanek (OSU), M. Stritzinger (Aarhus)
on 10 Nov 2018; 17:21 UT
Credential Certification: Subhash Bose (bose@pku.edu.cn)

Subjects: Optical, Supernovae

We report optical spectroscopic observation of five optical transients using OSMOS (range 398-686 nm) mounted on the MDM 2.4m telescope at KPNO. All targets were discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN, Shappee et al. 2014) and ATLAS survey (Tonry et al. 2011 and Tonry et al. ATel #8680). We used SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) to identify the types and phases of SNe from spectra.

 
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 Survey Name | IAU Name   | Obsv. Date    | Spec. Type | Phase     | Redshift     | Notes  
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 ATLAS18xye  | SN 2018hoi | 2018-11-01.09 |   Ia       | Near Max. | 0.03903 (NED)|  (1) 
 ATLAS18xuk  | AT 2018hob | 2018-11-05.43 |   CV       | ---       | ---          |    
 ATLAS18xss  | AT 2018hnv | 2018-11-06.06 |   CV       | ---       | ---          | 
 ATLAS18yaz  | SN 2018hpb | 2018-11-06.11 |   IIn      | ---       | 0.0177       |  (2) 
 ASASSN-18yp | SN 2018hrq | 2018-11-06.15 |   II       | ---       | 0.02706 (NED)|  (1,3) 
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(1) The SNID estimated redshift is consistent with that of the host galaxy.
(2) The redshift is estimated using emission lines in the spectrum.
(3) ASASSN-18yp (ATel #12170) spectrum is heavily contaminated by prevalent line features from the host galaxy, making the classification challenging. Nevertheless, SNID finds a number of matches with SNe IIb.