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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 2.

Optical and NIR spectra of SN 2022an. The phases of the spectra are given with respect to the time of B-band maximum, JD = 2459582. A telluric spectrum is shown at the top of the plot, and regions strongly affected by telluric absorption are marked with vertical gray bands. The inset panel shows a zoomed-in view of the detected absorption feature indicated by the black arrow, which, as discussed in the following sections, we attribute to the blueshifted He I line from its rest-frame wavelength of 1.083 μm (vertical dashed line).

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