DRAFT
2021-02-01 21:34:49
Type: Object/s-Discovery/Classification
Bibcode: 2021TNSAN..39....1C
Classification of SN 2021bhd (ATLAS21dfr) as a Type Ib/c supernova with Gemini-N / GMOS
Authors: T.-W. Chen (Stockholm), M. Huber, K. C. Chambers (IfA, Hawaii), S. Srivastav, M. Fulton, S. J. Smartt, K. W. Smith, O. McBrien, J. Gillanders, D. R. Young, L. Shingles, M. McCollum (Queen's University Belfast), J. Anderson (ESO), L. Denneau, A. Heinze, J. Tonry, H. Weiland (IfA, University of Hawaii), B. Stalder (LSST), A. Rest (STScI), D. E. Wright (University of Minnesota)
Source Group: ATLAS
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
Here we report the spectroscopic classification of SN 2021bhd (ATLAS21dfr; Shingles et al. Astronote 2021-31) in galaxy UGC 08737. The spectrum shows a good match with several Type Ib/c supernovae. The colour and Na I D lines in the spectrum indicate significant reddening from the host galaxy.

We classify SN 2021bhd (ATLAS21dfr; see Shingles et al. Astronote 2021-31) in galaxy UGC 08737 as a Type Ib/c supernova. 

Observations were performed on the Gemini North on the night of 2021 January 31 on MJD = 59245.59, 3 days after the ATLAS discovery (MJD = 59242.59), using GMOS-N and Grating R400 (with central wavelength around 6600A, resolution 1918). There was no detection by ATLAS on MJD 59238.61. 

The spectrum is red, showing Si II, O I and broad Ca II features adopting the host galaxy redshift of z=0.006. Classifications were done using GELATO (Harutyunyan et al., 2008, A&A, 488, 383). The spectrum shows a good match with SN 2007uy (Ib-pec) at +15d and SN 1996aq (Ic) at +20d. The phase has a mismatch compared to the light curve. The prominent Na I D absorption indicates significant host reddening. After correcting the spectrum for reddening (assuming Av from 1 to 2 mag), we get a better match with earlier phases. A good match is obtained with SN 1997X (Ic) at +10d, and with SN1997B (Ic) at +4.  

The classification spectra and additional details can be obtained from the IAU Transient Name Server.

The classified object is listed in the Related Objects table below.

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Source Phase (days) Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2021bhd [ATLAS21dfr] 13:48:14.697 +68:05:23.21 SN Ib/c 0.006 13:48:14.769 +68:05:22.94 SN Ib/c 0.006

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