TNS Classification Report No. 17883 [ 2024TNSCR3277....1G ]

Date Received (UTC): 2024-09-03 14:14:37
Sender: Ofer Yaron
Group: ZTF

Avishay Gal-Yam (WIS), Steve Schulze (CIERA/NU), Yi Yang (Tsinghua), Alexei V. Filippenko (Berkeley), Ofer Yaron (WIS), Jesper Sollerman (OKC), Adam A. Miller (CIERA/NU), Thomas G. Brink (Berkeley), WeiKang Zheng (Berkeley), S. J. Brennan (OKC), Erez A. Zimmerman (WIS), Conor Omand (LJMU), Mattia Bulla (Ferrara), and Anjasha Gangopadhyay (OKC) report/s a classification of object: SN 2021yfj

Type: SN Ien
Redshift: 0.13865

Remarks: The spectrum shows a large number of emission lines (pure emission and P Cygni profiles) from S III, S IV, Si III, Si IV and Ar III. See AstroNote 2024-239, which introduces the new Ien SN type, and AstroNote 2024-240 that provides additional details for the line identifications. (The redshift was measured from X-shooter spectra absorption and emission lines of the SN host galaxy.)

The following Classification spectrum was provided:

Obsdate: 2021-09-08 13:44:21
Instrument: LRIS
Telescope: Keck I 10m

Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2021yfj