Progenitor insights of Type IIP SN 2018pq: a comprehensive photometric and spectroscopic study
ABSTRACT We present high-cadence photometric and low-resolution (R $\sim$ 400–700) optical spectroscopic observations of Type IIP supernova, SN 2018pq, which exploded on the outskirts of the galaxy IC 3896A. The optically thick phase (‘plateau’) lasts approximately 97 d, the plateau duration of normal Type IIP supernovae. SN 2018pq has a V-band absolute magnitude of $-16.42 \pm 0.01$ mag at 50 d, resembles normal-luminous supernova, and the V-band decline rate of 0.42 $\pm$ 0.06 mag 50 d$^{-1}$ during the plateau phase. A steeper decline rate of 11.87 $\pm$ 1.68 mag 100 d$^{-1}$ was observed compared to that of typical Type IIP supernovae during the transition between plateau to nebular phase. We employ detailed radiative transfer spectra modelling, tardis, to reveal the photospheric temperature and velocity at two spectral epochs. The well-fitted model spectra indicate SN 2018pq is a spectroscopically normal Type IIP supernova. Semi-analytical light curve modelling suggests the progenitor as a red supergiant star with an ejecta mass of $\sim$11 ${\rm M}_\odot$ and an initial radius of 424 ${\rm R}_\odot$. On the contrary, hydrodynamical modelling suggests a higher mass progenitor between 14 and 16 ${\rm M}_\odot$.
Authors
- Raya Dastidar (ORCID: https://orcid.org/0000-0001-6191-7160)
- Bhavya Ailawadhi
- G. Csörnyei (ORCID: https://orcid.org/0000-0001-9210-9860)
- D. Hiramatsu (ORCID: https://orcid.org/0000-0002-1125-9187)
- I. Arcavi (ORCID: https://orcid.org/0000-0001-7090-4898)
- Naveen Dukiya (ORCID: https://orcid.org/0000-0002-0394-6745)
- C. McCully (ORCID: https://orcid.org/0000-0001-5807-7893)
- Kuntal Misra (ORCID: https://orcid.org/0000-0003-1637-267X)
- D. A. Howell (ORCID: https://orcid.org/0000-0003-4253-656X)
- Ajay Kumar Singh (ORCID: https://orcid.org/0000-0003-4544-3596)
- K. Azalee Bostroem (ORCID: https://orcid.org/0000-0002-4924-444X)
- Monalisa Dubey (ORCID: https://orcid.org/0009-0002-2621-6611)
- Griffin Hossienzadeh (ORCID: https://orcid.org/0000-0002-0832-2974)
Institutions
- Las Cumbres Observatory Global Telescope Network (US)
- European Southern Observatory (DE)
- University of Arizona (US)
- Universidad Andrés Bello (CL)
- M.J.P. Rohilkhand University (IN)
- University of California, Santa Barbara (US)
- Tel Aviv University (IL)
- Aryabhatta Research Institute of Observational Sciences (IN)
- University of California San Diego (US)
- Clínica Las Condes (CL)
- Millennium Institute of Astrophysics (CL)
- Center for Astrophysics Harvard & Smithsonian (US)
- The NSF AI Institute for Artificial Intelligence and Fundamental Interactions (US)
- Deen Dayal Upadhyaya Gorakhpur University (IN)
Publication Details
- Journal
- Monthly Notices of the Royal Astronomical Society
- Published
- 2025-06-20
- DOI
- https://doi.org/10.1093/mnras/staf1014
- Citations
- 2
- Primary Topic
- Gamma-ray bursts and supernovae
- Type
- article
- Field-Weighted Citation Impact
- 2.31
Funders
- National Science Foundation
- Agenția Națională pentru Cercetare și Dezvoltare
- Department of Science and Technology, Ministry of Science and Technology, India
- Nuclear Safety and Security Commission
- Agencia Nacional de Investigación y Desarrollo
- Fondo Nacional de Desarrollo Científico y Tecnológico
- CHIST-ERA