The Type II-P Supernova 2019mhm and Constraints on its Progenitor System

J. Vazquez*, C. D. Kilpatrick, G. Dimitriadis, R. J. Foley, A. L. Piro, A. Rest, C. Rojas-Bravo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We present pre- and postexplosion observations of the Type II-P supernova (SN II-P) 2019mhm located in NGC 6753. Based on optical spectroscopy and photometry, we show that SN 2019mhm exhibits broad lines of hydrogen with a velocity of −8500 ± 200 km s−1 and a 111 ± 2 day extended plateau in its luminosity, typical of the Type II-P subclass. We also fit its late-time bolometric light curve and infer that it initially produced a 56Ni mass of 1.3 × 10−2 ± 5.5 × 10−4 M . Using imaging from the Wide Field Planetary Camera 2 on the Hubble Space Telescope obtained 19 yr before explosion, we aligned to a postexplosion Wide Field Camera 3 image and demonstrate that there is no detected counterpart to the SN to a limit of >24.53 mag in F814W, corresponding to an absolute magnitude limit of M F814W < −7.7 mag. Comparing to massive-star evolutionary tracks, we determine that the progenitor star had a maximum zero-age main-sequence mass <17.5 M , consistent with other SN II-P progenitor stars. SN 2019mhm can be added to the growing population of SNe II-P with both direct constraints on the brightness of their progenitor stars and well-observed SN properties.

Original languageEnglish (US)
Article number75
JournalAstrophysical Journal
Volume949
Issue number2
DOIs
StatePublished - Jun 1 2023

Funding

We thank Ben Davies for providing the progenitor luminosity code and helpful comments on our analysis. We also thank Jorge Anais Vilchez, Abdo Campillay, Yilin Kong-Riveros, Nahir Muñoz-Elgueta, and Natalie Ulloa for observations made at the Swope Telescope at Las Campanas Observatory, Chile. We thank Tom Holoien and Subo Dong for providing the raw du Pont data. This material is based upon work supported by the National Science Foundation under grant No. 1757792, a Research Experiences for Undergraduates (REU) grant awarded to CIERA at Northwestern University. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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