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SN2020cpg :
SN2020cpg : an energetic link between Type IIb and Ib supernovae
- Article/chapterEnglish2021
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2021-06-22
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Oxford University Press (OUP),2021
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LIBRIS-ID:oai:DiVA.org:su-199130
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-199130URI
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https://doi.org/10.1093/mnras/stab1761DOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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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.
Subject headings and genre
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Mazzali, P. A.
(author)
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Teffs, J.
(author)
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Prentice, S. J.
(author)
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Ashall, C.
(author)
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Amenouche, M.
(author)
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Anderson, J. P.
(author)
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Burke, J.
(author)
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Chen, Ting-WanStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)jach1916
(author)
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Galbany, L.
(author)
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Gromadzki, M.
(author)
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Gutierrez, C. P.
(author)
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Hiramatsu, D.
(author)
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Howell, D. A.
(author)
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Inserra, C.
(author)
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Kankare, E.
(author)
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McCully, C.
(author)
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Müller-Bravo, T. E.
(author)
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Nicholl, M.
(author)
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Pellegrino, C.
(author)
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Sollerman, JesperStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)solle
(author)
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Stockholms universitetInstitutionen för astronomi
(creator_code:org_t)
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In:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)506:2, s. 1832-18490035-87111365-2966
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Medler, K.
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Mazzali, P. A.
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Teffs, J.
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Prentice, S. J.
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Ashall, C.
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Amenouche, M.
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show more...
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Anderson, J. P.
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Burke, J.
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Chen, Ting-Wan
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Galbany, L.
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Gromadzki, M.
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Gutierrez, C. P.
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Hiramatsu, D.
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Howell, D. A.
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Inserra, C.
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Kankare, E.
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McCully, C.
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Müller-Bravo, T. ...
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Nicholl, M.
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Pellegrino, C.
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Sollerman, Jespe ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Stockholm University