Journal article
SN 2024iss: A Multiwavelength Exposé of a Type IIb Supernova with an Early-time Ultraviolet Spectrum and Shock-breakout Constraints
RJ Yete, WV Jacobson-Galán, Ferdinand, L Dessart, MM Kasliwal, KW Davis, AL Piro, VA Villar, I Andreoni, K Auchettl, KC Chambers, R Chornock, MW Coughlin, DA Coulter, R Dekany, RJ Foley, OD Fox, L Galbany, C Gall, A Gangopadhyay Show all
The Astrophysical Journal | American Astronomical Society | Published : 2026
Open access
Abstract
Abstract We present multiwavelength observations and analysis of SN 2024iss, a Type IIb supernova (SN IIb) located at ∼14 Mpc. The first Zwicky Transient Facility detection of SN 2024iss is ∼40 minutes after first light (one of the earliest detections of a SN IIb to date) and a Hubble Space Telescope (HST) UV spectrum was obtained at 7 days (the earliest HST UV SN IIb spectrum to date). We estimate an ejecta mass range of 1.1–3.3 M ⊙ and a 56 Ni mass of 0.11 ± 0.01 M ⊙ from bolometric light-curve..
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