SN 2021gno: a calcium-rich transient with double-peaked light curves

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 et al (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
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
Date of acceptance:	1 September 2023
Date of first compliant Open Access:	7 February 2024
Date Deposited:	07 Feb 2024 15:39
Last Modified:	07 Feb 2024 15:39
DOI or ID number:	10.1093/mnras/stad2705
URI:	https://ljmu-9.eprints-hosting.org/id/eprint/22534

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