Spectroscopic classification of three transients discovered by ASAS-SN and Gaia

ATel #11231; Fengwu Sun, Ping Chen, Subhash Bose, Subo Dong (KIAA-PKU)
on 26 Jan 2018; 07:16 UT
Credential Certification: Subhash Bose (bose@pku.edu.cn)

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We report optical spectroscopic observations of transients ASASSN-18az, Gaia18afh and Gaia18afb done on UT 2018-01-24, with DBSP mounted on the Hale 5m telescope at Palomar Observatory. The targets were discovered by All-Sky Automated Survey for Supernovae (ASAS-SN, Shappee et al. 2014) and the ESA Gaia Photometric Science Alerts Team (http://gsaweb.ast.cam.ac.uk/alerts). 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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 ASASSN-18az | SN 2018jh | 2017-12-28.42 | SN Ia      | pre-max.    |  0.030       | (1) 
 Gaia18afh   | SN 2018jc | 2017-12-28.12 | SN Ia      | around max. |  0.017 (NED) | (2) 
 Gaia18afb   | AT 2018iv | 2017-12-28.29 | CV         | ---         |  0.0         |       
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(1) The redshift is estimated using the narrow lines from host, which is also consistent with the SNID estimated redshift. Our classification is consistent with that reported by James Neill (2018jh).
(2) The SNID estimated redshift is consistent with the redshift of the host 2MASX J22244417+1221410.

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.