[ Previous | Next | ADS ]

Spectroscopic classification optical transients with Keck II/DEIMOS

ATel #10979; WeiKang Zheng, Thomas de Jaeger, Thomas G. Brink, Alexei. V. Filippenko (UC Berkeley)
on 17 Nov 2017; 07:05 UT
Credential Certification: Weikang Zheng (zwk@umich.edu)

Subjects: Optical, Supernovae

We report the classification of two optical transients (AT2017hta and SN 2017hig) from spectra obtained with the DEep Imaging Multi-Object Spectrograph (DEIMOS) on the Keck II 10-m telescope. We also confirm the classification of SN 2017hca (ATel #10889). The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

  
 Survey Name |  IAU Name      | UT Obs. Date      |   z       | Type | Phase      |  Notes 
 kait-17df      |  AT2017hta     | 2017-11-16.21 | 0.006  |  II | +20d       | (1) 
 Gaia17cow    |  SN2017hig     | 2017-10-14.65 | 0.045  |  Ia     | pre-max | (2) 
 ATLAS17lsr   |  SN2017hca     | 2017-10-14.65 | 0.0134 |  II     | ---         | (3) 

(1) The spectrum matches those of several Type II SNe a few weeks after explosion. The redshift is derived from SNID. (2) The spectrum matches those of several normal Type Ia SNe a few days before maximum light. Adopting a redshift z = 0.045 from the assumed host galaxy 2MASX J10331713+1624254, the expansion velocity measured from the minimum of the Si II 635.5 nm line is ~14,100 km/s. (3) We confirm this is a Type II SN as reported in ATel #10889.