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Desai, DD, Ashall, C, Shappee, BJ, Morrell, N, Galbany, L, Burns, CR, Derkacy, JM, Hinkle, JT, Hsiao, E, Kumar, S, Lu, J, Phillips, MM, Shahbandeh, M, Stritzinger, MD, Baron, E, Bersten, MC, Brown, PJ, De Jaeger, T, Elias-Rosa, N, Folatelli, G , Huber, ME, Mazzali, P, Müller-Bravo, TE, Piro, AL, Polin, A, Suntzeff, NB, Anderson, JP, Chambers, KC, Chen, TW, De Boer, T, Fulton, MD, Gao, H, Gromadzki, M, Inserra, C, Magnier, EA, Nicholl, M, Ragosta, F, Wainscoat, R and Young, DR (2023) Fast and not-so-furious: Case study of the fast and faint Type IIb SN 2021bxu. Monthly Notices of the Royal Astronomical Society, 524 (1). pp. 767-785. ISSN 0035-8711
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Fast and not so furious Case study of the fast and faint Type IIb SN 2021bxu.pdf - Published Version Download (3MB) | Preview |
Abstract
We present photometric and spectroscopic observations and analysis of SN 2021bxu (ATLAS21dov), a low-luminosity, fast-evolving Type IIb supernova (SN). SN 2021bxu is unique, showing a large initial decline in brightness followed by a short plateau phase. With during the plateau, it is at the lower end of the luminosity distribution of stripped-envelope supernovae (SE-SNe) and shows a distinct ∼10 d plateau not caused by H- or He-recombination. SN 2021bxu shows line velocities which are at least slower than typical SE-SNe. It is photometrically and spectroscopically similar to Type IIb SNe during the photospheric phases of evolution, with similarities to Ca-rich IIb SNe. We find that the bolometric light curve is best described by a composite model of shock interaction between the ejecta and an envelope of extended material, combined with a typical SN IIb powered by the radioactive decay of 56Ni. The best-fitting parameters for SN 2021bxu include a 56Ni mass of, an ejecta mass of, and an ejecta kinetic energy of. From the fits to the properties of the extended material of Ca-rich IIb SNe we find a trend of decreasing envelope radius with increasing envelope mass. SN 2021bxu has MNi on the low end compared to SE-SNe and Ca-rich SNe in the literature, demonstrating that SN 2021bxu-like events are rare explosions in extreme areas of parameter space. The progenitor of SN 2021bxu is likely a low-mass He star with an extended envelope.
| Item Type: | Article |
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| Uncontrolled Keywords: | 0201 Astronomical and Space Sciences; Astronomy & Astrophysics |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Oxford University Press |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 08 Oct 2024 11:58 |
| Last Modified: | 08 Oct 2024 12:00 |
| DOI or ID number: | 10.1093/mnras/stad1932 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/24447 |
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