SN 2019hnl: A Type IIP Supernova with a Partially Stripped, Low-mass Progenitor
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 (SN) 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 an M ZAMS ∼ 11 M ⊙ red supergiant, which produced 0.047 ± 0.007 M ⊙ of 56 Ni 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 (∼0.2 M ⊙ ) circumstellar material environments prior to core collapse.
Authors
- M. Lundquist (ORCID: https://orcid.org/0000-0001-9589-3793)
- Daryl Janzen (ORCID: https://orcid.org/0000-0003-0549-3281)
- Saurabh W. Jha (ORCID: https://orcid.org/0000-0001-8738-6011)
- C. Pellegrino (ORCID: https://orcid.org/0000-0002-7472-1279)
- Jeniveve Pearson (ORCID: https://orcid.org/0000-0002-0744-0047)
- Aravind P. Ravi (ORCID: https://orcid.org/0000-0002-7352-7845)
- Jennifer E. Andrews (ORCID: https://orcid.org/0000-0003-0123-0062)
- D. Hiramatsu (ORCID: https://orcid.org/0000-0002-1125-9187)
- G. Hosseinzadeh (ORCID: https://orcid.org/0000-0002-0832-2974)
- Yize Dong (ORCID: https://orcid.org/0000-0002-7937-6371)
- Emily Hoang (ORCID: https://orcid.org/0000-0003-2744-4755)
- S. Valenti (ORCID: https://orcid.org/0000-0001-8818-0795)
- David J. Sand (ORCID: https://orcid.org/0000-0003-4102-380X)
- Darshana Mehta (ORCID: https://orcid.org/0009-0008-9693-4348)
- N. Meza (ORCID: https://orcid.org/0000-0002-7015-3446)
- C. McCully (ORCID: https://orcid.org/0000-0001-5807-7893)
- D. A. Howell (ORCID: https://orcid.org/0000-0003-4253-656X)
- Manisha Shrestha (ORCID: https://orcid.org/0000-0002-4022-1874)
- Aidan Martas
- K. Azalee Bostroem (ORCID: https://orcid.org/0000-0002-4924-444X)
Publication Details
- Journal
- The Astrophysical Journal
- Published
- 2025-10-22
- DOI
- https://doi.org/10.3847/1538-4357/ae0617
- Primary Topic
- Gamma-ray bursts and supernovae
- Type
- article
- Field-Weighted Citation Impact
- 0.00