Light curve and spectral modelling of the type IIb SN 2020acat-Evidence for a strong Ni bubble effect on the diffusion time

M Ergon, P Lundqvist, C Fransson… - Astronomy & …, 2024 - aanda.org
We use the light-curve and spectral synthesis code JEKYLL to calculate a set of
macroscopically mixed type IIb supernova (SN) models, which are compared to both …

Bridging between type IIb and Ib supernovae: SN IIb 2022crv with a very thin Hydrogen envelope

A Gangopadhyay, K Maeda, A Singh… - The Astrophysical …, 2023 - iopscience.iop.org
We present optical, near-infrared, and radio observations of supernova (SN) SN IIb 2022crv.
We show that it retained a very thin H envelope and transitioned from an SN IIb to an SN Ib; …

Nebular nitrogen line emission in stripped-envelope supernovae–a new progenitor mass diagnostic

S Barmentloo, A Jerkstrand, K Iwamoto… - Monthly Notices of …, 2024 - academic.oup.com
Nitrogen is produced by CNO-cycling in massive stars, and can be ejected in significant
amounts in supernova explosions. While in H-rich SNe, its [N ii] 6548, 6583 emission …

Flat-topped NIR profiles originating from an unmixed helium shell in the Type IIb SN 2020acat

K Medler, PA Mazzali, C Ashall, J Teffs… - Monthly Notices of …, 2023 - academic.oup.com
ABSTRACT The Near Infrared (NIR) spectra of the Type IIb supernova (SN IIb) SN 2020acat,
obtained at various times throughout the optical follow-up campaign, are presented here …

SN 2019tua: A Type IIb Supernova with Multiple Bumps in the Light Curves

XB Huang, XG Wang, L Li, LP Xin, J Wang… - The Astrophysical …, 2024 - iopscience.iop.org
We present photometric and spectroscopic observations and analysis of the Type IIb
supernova (SN) SN 2019tua, which exhibits multiple bumps in its declining light curves …

SN 2022oqm–A Ca-rich Explosion of a Compact Progenitor Embedded in C/O Circumstellar Material

I Irani, P Chen, J Morag, S Schulze… - The Astrophysical …, 2024 - iopscience.iop.org
We present the discovery and analysis of SN 2022oqm, a Type Ic supernova (SN) detected<
1 day after the explosion. The SN rises to a blue and short-lived (2 days) initial peak. Early …

SN 2022oqm--a Ca-rich explosion of a compact progenitor embedded in C/O circumstellar material

I Irani, P Chen, J Morag, S Schulze, A Gal-Yam… - arXiv preprint arXiv …, 2022 - arxiv.org
We present the discovery and analysis of SN\, 2022oqm, a Type Ic supernova (SN) detected
$< 1$\, day after explosion. The SN rises to a blue and short-lived (2\, days) initial peak …

SN 2019odp–A massive oxygen-rich Type Ib supernova

T Schweyer, J Sollerman, A Jerkstrand… - Astronomy & …, 2025 - aanda.org
Aims. Stripped envelope (SE) supernovae are explosions of stars that have somehow lost
most of their outer envelopes. We present the discovery and analyse the observations of the …

Lightcurve and spectral modelling of the Type IIb SN 2020acat

M Ergon, P Lundqvist, C Fransson, H Kuncarayakti… - 2023 - aanda.org
We use the light-curve and spectral synthesis code JEKYLL to calculate a set of
macroscopically mixed type IIb supernova (SN) models, which are compared to both …

[PDF][PDF] ANALYSIS OF MULTIPLE TRANSITIONAL STRIPPED-ENVELOPE CORE-COLLAPSE SUPERNOVAE

K Medler - 2023 - researchonline.ljmu.ac.uk
Massive stars, with 𝑀ZAMS> 8 M⊙, end their lives as explosive events known as
corecollapse supernovae (CC-SNe). A sub-class of these CC-SNe have had some or part of …