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

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arxiv 2509.03732 v1 pith:YO6D5VQ6 submitted 2025-09-03 astro-ph.HE astro-ph.SR

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

Aidan Martas , Stefano Valenti , Aravind P. Ravi , Yize Dong , K. Azalee Bostroem , Jeniveve Pearson , Manisha Shrestha , Jennifer E. Andrews
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David J. Sand Griffin Hosseinzadeh Michael Lundquist Emily Hoang Darshana Mehta Nicolas Meza Retamal Saurabh W. Jha Daryl Janzen D. Andrew Howell Curtis McCully Daichi Hiramatsu Craig Pellegrino
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classification astro-ph.HE astro-ph.SR
keywords massprogenitorsolartypedaysexplosionhydrodynamicmodeling
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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.

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  1. SN 2022xus: bridging the gap between Type IIP and IIL supernovae

    astro-ph.HE 2026-07 conditional novelty 4.0

    SN 2022xus is a transitional Type II supernova with a 94.8-day plateau, a decline rate of 1.23 mag per 100 days, mixed IIP/IIL spectral features, and a likely 12-15 solar-mass progenitor.