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Ertini, K, Folatelli, G, Martinez, L, Bersten, MC, Anderson, JP, Ashall, C, Baron, E, Bose, S, Brown, PJ, Burns, C, Derkacy, JM, Ferrari, L, Galbany, L, Hsiao, E, Kumar, S, Lu, J, Mazzali, P, Morrell, N, Orellana, M, Pessi, PJ , Phillips, MM, Piro, AL, Polin, A, Shahbandeh, M, Shappee, BJ, Stritzinger, M, Suntzeff, NB, Tucker, M, Elias-Rosa, N, Kuncarayakti, H, Gutiérrez, CP, Kozyreva, A, Müller-Bravo, TE, Chen, TW, Hinkle, JT, Payne, AV, Székely, P, Szalai, T, Barna, B, Könyves-Tóth, R, Bánhidi, D, Bíró, IB, Csányi, I, Kriskovits, L, Pál, A, Szabó, Z, Szakáts, R, Vida, K, Vinkó, J, Gromadzki, M, Harvey, L, Nicholl, M, Paraskeva, E, Young, DR and Englert, B (2023) SN 2021gno: a calcium-rich transient with double-peaked light curves. Monthly Notices of the Royal Astronomical Society, 526 (1). pp. 279-298. ISSN 0035-8711
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Abstract
We present extensive ultraviolet (UV) and optical photometric and optical spectroscopic follow-up of supernova (SN) 2021gno by the 'Precision Observations of Infant Supernova Explosions' (POISE) project, starting less than 2 d after the explosion. Given its intermediate luminosity, fast photometric evolution, and quick transition to the nebular phase with spectra dominated by [Ca ii] lines, SN 2021gno belongs to the small family of Calcium-rich transients. Moreover, it shows double-peaked light curves, a phenomenon shared with only four other Calcium-rich events. The projected distance from the centre of the host galaxy is not as large as other objects in this family. The initial optical light-curve peaks coincide with a very quick decline of the UV flux, indicating a fast initial cooling phase. Through hydrodynamical modelling of the bolometric light curve and line velocity evolution, we found that the observations are compatible with the explosion of a highly stripped massive star with an ejecta mass of and a 56Ni mass of 0.024 M⊙. The initial cooling phase (first light-curve peak) is explained by the presence of an extended circumstellar material comprising ∼ with an extension of. We discuss if hydrogen features are present in both maximum-light and nebular spectra, and their implications in terms of the proposed progenitor scenarios for Calcium-rich transients.
| Item Type: | Article |
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| Additional Information: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2023 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
| 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: | 07 Feb 2024 15:39 |
| Last Modified: | 07 Feb 2024 15:39 |
| DOI or ID number: | 10.1093/mnras/stad2705 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/22534 |
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