SN 2019hnl: A Type IIP Supernova with a Partially Stripped, Low Mass Progenitor

2025/09/03 by Martas, Aidan, Valenti, Stefano, Ravi, Aravind P. +17
#FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #Solar and Stellar Astrophysics (astro-ph.SR)

paper · doi:10.48550/arxiv.2509.03732

Abstract

We present optical photometry and spectroscopy of SN 2019hnl. Discovered within ~26 hr of explosion by the ATLAS survey, SN 2019hnl is a typical Type IIP supernova with a peak absolute V band magnitude of -16.7+-0.1 mag, a plateau length of ~107 days, and an early decline rate of 0.0086+-0.0006 mag (50 days)^-1. We use nebular spectroscopy and hydrodynamic modeling with the SNEC, MESA, and STELLA codes to infer that the progenitor of SN 2019hnl was a M_ZAMS ~ 11M_solar red supergiant which produced 0.047+-0.007M_solar of 56Ni in the explosion. As a part of our hydrodynamic modeling, we reduced hydrogen envelope mass by scaling the mass loss within the "Dutch" wind scheme to fit our light curve, showing that the progenitor of a relatively typical Type IIP SN may experience partial stripping during their evolution and establish massive (~0.2M_solar) CSM environments prior to core collapse.

Citations

• Optical and near-infrared photometry of 94 type II supernovae from the Carnegie Supernova Project
• Diversity in hydrogen-rich envelope mass of type II supernovae (II): SN 2023ixf as explosion of partially-stripped intermediate massive star
• Evidence of weak circumstellar medium interaction in the Type II SN 2023axu
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• Array programming with NumPy
• SciPy 1.0: fundamental algorithms for scientific computing in Python
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• The Astropy Project: Building an Open-science Project and Status of the v2.0 Core Package*
• NINE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE ( WMAP ) OBSERVATIONS: COSMOLOGICAL PARAMETER RESULTS
• emcee : The MCMC Hammer

Related

• Progenitor Insights of Type IIP SN 2018pq: A Comprehensive Photometric and Spectroscopic Study
• SN 2022xus: bridging the gap between Type IIP and IIL supernovae
• SN 2021wvw: A core-collapse supernova at the sub-luminous, slower, and shorter end of Type IIPs
• SN 2024hpj: a perspective on SN 2009ip-like events
• SN 2021dbg: A Luminous Type IIP-IIL Supernova Exploding from a Massive Star with a Layered Shell