Tools
Tools
Valerin, G, Pumo, ML, Pastorello, A, Reguitti, A, Elias-Rosa, N, Gútierrez, CP, Kankare, E, Fraser, M, Mazzali, PA, Howell, DA, Kotak, R, Galbany, L, Williams, SC, Cai, YZ, Salmaso, I, Pinter, V, Müller-Bravo, TE, Burke, J, Gonzalez, EP, Hiramatsu, D , McCully, C, Newsome, M and Pellegrino, C (2022) Low luminosity Type II supernovae - IV. SN 2020cxd and SN 2021aai, at the edges of the sub-luminous supernovae class. Monthly Notices of the Royal Astronomical Society, 513 (4). pp. 4983-4999. ISSN 0035-8711
|
Text
stac1182.pdf - Published Version Download (2MB) | Preview |
Abstract
Photometric and spectroscopic data for two Low Luminosity Type IIP Supernovae (LL SNe IIP) 2020cxd and 2021aai are presented. SN 2020cxd was discovered 2 d after explosion at an absolute magnitude of Mr = -14.02 ± 0.21 mag, subsequently settling on a plateau which lasts for ∼120 d. Through the luminosity of the late light curve tail, we infer a synthesized 56Ni mass of (1.8 ± 0.5) × 10-3 M⊙. During the early evolutionary phases, optical spectra show a blue continuum (T >8000 K) with broad Balmer lines displaying a P Cygni profile, while at later phases, Ca ii, Fe ii, Sc ii, and Ba ii lines dominate the spectra. Hydrodynamical modelling of the observables yields R ~ 575 R⊙ for the progenitor star, with Mej = 7.5 M⊙ and E ~ 0.097 foe emitted during the explosion. This low-energy event originating from a low-mass progenitor star is compatible with both the explosion of a red supergiant (RSG) star and with an Electron Capture Supernova arising from a super asymptotic giant branch star. SN 2021aai reaches a maximum luminosity of Mr = -16.57 ± 0.23 mag (correcting for AV = 1.92 mag), at the end of its remarkably long plateau (∼140 d). The estimated 56Ni mass is (1.4 ± 0.5) × 10-2 M⊙. The expansion velocities are compatible with those of other LL SNe IIP (few 103 km s-1). The physical parameters obtained through hydrodynamical modelling are R ~575 R⊙, Mej = 15.5 M⊙, and E = 0.4 foe. SN 2021aai is therefore interpreted as the explosion of an RSG, with properties that bridge the class of LL SNe IIP with standard SN IIP events.
| Item Type: | Article |
|---|---|
| Additional Information: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2022 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 (OUP) |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 01 Nov 2022 11:10 |
| Last Modified: | 01 Nov 2022 11:15 |
| DOI or ID number: | 10.1093/mnras/stac1182 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/17980 |
 |
View Item |