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Medler, K, Mazzali, PA, Teffs, J, Prentice, SJ, Ashall, C, Amenouche, M, Anderson, JP, Burke, J, Chen, TW, Galbany, L, Gromadzki, M, Gutierrez, CP, Hiramatsu, D, Howell, DA, Inserra, C, Kankare, E, McCully, C, Muller-Bravo, TE, Nicholl, M, Pellegrino, C and Sollerman, J (2021) SN2020cpg: an energetic link between Type IIb and Ib supernovae. Monthly Notices of the Royal Astronomical Society, 506 (2). pp. 1832-1849. ISSN 0035-8711
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Abstract
Stripped-envelope supernovae (SE-SNe) show a wide variety of photometric and spectroscopic properties. This is due to the different potential formation channels and the stripping mechanism that allows for a large diversity within the progenitors outer envelope compositions. Here, the photometric and spectroscopic observations of SN 2020cpg covering ~130 d from the explosion date are presented. SN 2020cpg (z = 0.037) is a bright SE-SNe with the B-band peaking at MB = -17.75 ± 0.39 mag and a maximum pseudo-bolometric luminosity of Lmax = 6.03 ± 0.01 × 1042 erg s-1. Spectroscopically, SN 2020cpg displays a weak high- and low-velocity H α feature during the photospheric phase of its evolution, suggesting that it contained a detached hydrogen envelope prior to explosion. From comparisons with spectral models, the mass of hydrogen within the outer envelope was constrained to be ~0.1 M⊙. From the pseudo-bolometric light curve of SN 2020cpg a 56Ni mass of MNi ~0.27 ± 0.08 M⊙ was determined using an Arnett-like model. The ejecta mass and kinetic energy of SN 2020cpg were determined using an alternative method that compares the light curve of SN 2020cpg and several modelled SE-SNe, resulting in an ejecta mass of Mejc ~5.5 ± 2.0 M⊙ and a kinetic energy of EK ~9.0 ± 3.0 × 1051 erg. The ejected mass indicates a progenitor mass of 18-25 M⊙. The use of the comparative light curve method provides an alternative process to the commonly used Arnett-like model to determine the physical properties of SE-SNe.
| Item Type: | Article |
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| Additional Information: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
| Uncontrolled Keywords: | Science & Technology; Physical Sciences; Astronomy & Astrophysics; supernovae: general; supernovae: individual (SN2020cpg); LIGHT CURVES; PRESUPERNOVA EVOLUTION; BINARY PROGENITOR; UBVRI PHOTOMETRY; IC SUPERNOVA; EXPLOSION; SN-1993J; HELIUM; M81; CONSTRAINTS; 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: | 09 May 2022 11:40 |
| Last Modified: | 09 May 2022 11:45 |
| DOI or Identification number: | 10.1093/mnras/stab1761 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/16781 |
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