TNS Classification Report No. 8731 [ 2021TNSCR.305....1C ]
Date Received (UTC): 2021-02-01 21:41:19 Sender: Ting-Wan Chen
Group: ATLAS
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) report/s a classification of object: SN 2021bhd
Type: SN Ib/cRedshift: 0.006
Remarks: 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 following Classification spectrum was provided:
Obsdate: 2021-01-31 14:08:10
Instrument: GMOS
Telescope: Gemini North
Remarks: Observed frame, without extinction corrections.
Details of the object and its spectra can be viewed here: https://sandbox.wis-tns.org/object/2021bhd
Date Received (UTC): 2021-02-01 21:41:19 Sender: Ting-Wan Chen
Group: ATLAS
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) report/s a classification of object: SN 2021bhd
Type: SN Ib/cRedshift: 0.006
Remarks: 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 following Classification spectrum was provided:
Obsdate: 2021-01-31 14:08:10
Instrument: GMOS
Telescope: Gemini North
Remarks: Observed frame, without extinction corrections.
Details of the object and its spectra can be viewed here: https://sandbox.wis-tns.org/object/2021bhd