| Title: |
Revealing the Progenitor of SN 2021zby through Analysis of the TESS Shock-cooling Light Curve |
| Authors: |
Wang, Q; Armstrong, P; Zenati, Y; Ridden-Harper, R; Rest, A; Arcavi, I; Kilpatrick, CD; Foley, RJ; Tucker, BE; Lidman, C; Killestein, TL; Shahbandeh, M; Anderson, JP; Angulo, R; Ashall, C; Burke, J; Chen, T-W; von Coelln, S; Dalrymple, KA; Davis, KW; Fulton, MD; Galbany, L; Gonzalez, EP; Gao, B; Gromadzki, M; Howell, DA; Ihanec, N; Jencson, JE; Jones, DO; Lyman, JD; McCully, C; Müller-Bravo, TE; Newsome, M; Nicholl, M; O’Neill, D; Pellegrino, C; Rest, S; Smartt, SJ; Smith, K; Srivastav, S; Terreran, G; Tinyanont, S; Young, DR; Zenteno, A |
| Publisher Information: |
American Astronomical Society |
| Publication Year: |
2026 |
| Collection: |
Oxford University Research Archive (ORA) |
| Description: |
We present early observations and analysis of the double-peaked Type IIb supernova (SN IIb) SN 2021zby. TESS captured the prominent early shock-cooling peak of SN 2021zby within the first ∼10 days after explosion with a 30 minute cadence. We present optical and near-infrared spectral series of SN 2021zby, including three spectra during the shock-cooling phase. Using a multiband model fit, we find that the inferred properties of its progenitor are consistent with a red supergiant or yellow supergiant, with an envelope mass of ∼0.30–0.65 M ⊙ and an envelope radius of ∼120–300 R ⊙. These inferred progenitor properties are similar to those of other SNe IIb with a double-peaked feature, such as SNe 1993J, 2011dh, 2016gkg, and 2017jgh. This study further validates the importance of the high cadence and early coverage in resolving the shape of the shock-cooling light curve, while the multiband observations, particularly UV, are also necessary to fully constrain the progenitor properties. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.3847/2041-8213/acb0d0 |
| Availability: |
https://doi.org/10.3847/2041-8213/acb0d0; https://ora.ox.ac.uk/objects/uuid:ab8f95a0-c066-421c-9bf2-00ff2478eda5 |
| Rights: |
info:eu-repo/semantics/openAccess ; CC Attribution (CC BY) |
| Accession Number: |
edsbas.274B012C |
| Database: |
BASE |