Details

Autor(en) / Beteiligte

• Medler, K
• Mazzali, P A
• Teffs, J
• Prentice, S J
• Ashall, C
• Amenouche, M
• Anderson, J P
• Burke, J
• Chen, T W
• Galbany, L
• Gromadzki, M
• Gutiérrez, C P
• Hiramatsu, D
• Howell, D A
• Inserra, C
• Kankare, E
• McCully, C
• Müller-Bravo, T E
• Nicholl, M
• Pellegrino, C
• Sollerman, J

Titel

SN 2020cpg: an energetic link between Type IIb and Ib supernovae

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2021-07, Vol.506 (2), p.1832-1849

Ort / Verlag

Oxford University Press

Erscheinungsjahr

2021

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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.