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Spectroscopic classification optical transients with P200 DBSP

ATel #12022; Subhash Bose, Ping Chen, Subo Dong (KIAA-PKU)
on 9 Sep 2018; 12:46 UT
Credential Certification: Subhash Bose (bose@pku.edu.cn)

Subjects: Cataclysmic Variable, Supernovae

We report optical spectroscopic observations of transients ASASSN-18th, ASASSN-18ts (ATel #12008), ASASSN-18ui, ASASSN-18sw (ATel #11979), ATLAS18uen, Gaia18ckn, Gaia18ciw and ZTF18abrqfjs done on UT 2018-09-08, with DBSP mounted on the Hale 5m telescope at Palomar Observatory. Targets were discovered by All-Sky Automated Survey for Supernovae (ASAS-SN, Shappee et al. 2014), Gaia Alerts (http://gsaweb.ast.cam.ac.uk/alerts/alertsindex), Zwicky Transient Facility (ZTF; ATel #11266) 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.

 
------------------------------------------------------------------------------------------------ 
 Survey Name  | IAU Name   | Obsv. Date    | Spec. Type | Phase          | Redshift    | Notes  
------------------------------------------------------------------------------------------------ 
 ASASSN-18th  | AT 2018fnp | 2018-09-08.17 |   CV       | ---            | ---         | 
 ASASSN-18ui  | AT 2018fvs | 2018-09-08.18 |   CV       | ---            | ---         |    
 ASASSN-18ts  | SN 2018fsa | 2018-09-08.34 |   Ia       | 5-10d pre-max. | 0.040       | (1,2)  
 ASASSN-18sw  | SN 2018ffz | 2018-09-08.44 |   Ic       | Near max.      | 0.010       |  (2) 
 ATLAS18uen   | AT 2018frz | 2018-09-08.39 |   CV       | ---            | ---         |   
 Gaia18ckn    | AT 2018fok | 2018-09-08.45 |   Gal      | ---            | ---         |  (3) 
 ZTF18abrqfjs | AT 2018fmq | 2018-09-08.46 |   CV       | ---            | ---         |   
 Gaia18ciw    | SN 2018fmf | 2018-09-08.51 |   IIP      | Plateau phase  | 0.008 (NED) |  (4) 
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(1) The classification is consistent with that reported in TNS.
(2) The SNID estimated redshifts for these SNe has significant uncertainty.
(3) The spectrum was obtained using 1.5" slit positioned at the galaxy center, and no SN feature has been detected.
(4) The spectrum shows well developed P-Cygni profiles of Halpha and several metallic lines, consistent to several weeks old type II SNe in the plateau phase.

This research uses data obtained through the Telescope Access Program (TAP), which has been funded by the National Astronomical Observatories of China, the Chinese Academy of Sciences, and the Special Fund for Astronomy from the Ministry of Finance. Observations obtained with the Hale Telescope at Palomar Observatory were obtained as part of an agreement between the National Astronomical Observatories, Chinese Academy of Sciences, and the California Institute of Technology.