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  • Medler, K. (author)

SN2020cpg : an energetic link between Type IIb and Ib supernovae

  • Article/chapterEnglish2021

Publisher, publication year, extent ...

  • 2021-06-22
  • Oxford University Press (OUP),2021
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-199130
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-199130URI
  • https://doi.org/10.1093/mnras/stab1761DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • 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.

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Added entries (persons, corporate bodies, meetings, titles ...)

  • Mazzali, P. A. (author)
  • Teffs, J. (author)
  • Prentice, S. J. (author)
  • Ashall, C. (author)
  • Amenouche, M. (author)
  • Anderson, J. P. (author)
  • Burke, J. (author)
  • Chen, Ting-WanStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)jach1916 (author)
  • Galbany, L. (author)
  • Gromadzki, M. (author)
  • Gutierrez, C. P. (author)
  • Hiramatsu, D. (author)
  • Howell, D. A. (author)
  • Inserra, C. (author)
  • Kankare, E. (author)
  • McCully, C. (author)
  • Müller-Bravo, T. E. (author)
  • Nicholl, M. (author)
  • Pellegrino, C. (author)
  • Sollerman, JesperStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)solle (author)
  • Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

Related titles

  • In:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)506:2, s. 1832-18490035-87111365-2966

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