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Detection of Persistent Helium Absorption in the 91bg-like Type Ia Supernova 2022an

  • Authors: Ping Chen, Avishay Gal-Yam, Subo Dong, Renyue Cen, Boaz Katz, Kate Maguire, Steve Schulze, Jesper Sollerman, Joseph P Anderson, Ting-Wan Chen, L. Galbany, Mariusz Gromadzki, Chang Liu, Adam A. Miller, Tomás E. Müller-Bravo, Tanja Petrushevska, Giuliano Pignata

Ping Chen et al 2026 The Astrophysical Journal Letters 1004 .

  • Provider: AAS Journals

Caption: Figure 6.

Spectra of SN 2022an compared with those of the normal SN Ia SN 2011fe (R. Pereira et al. 2013), the transitional Ia SN 2015bp (S. D. Wyatt et al. 2021), SN 1991bg (A. V. Filippenko et al. 1992b; B. Leibundgut et al. 1993), and the 91bg-like SN 1999by (P. Höflich et al. 2002; P. M. Garnavich et al. 2004) and SN 2005bl (S. Taubenberger et al. 2008; S. Hachinger et al. 2009). The color-stretch parameter sBV of each supernova and the phase of each spectrum relative to the B-band maximum are listed.

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