Core-collapse supernovae 2022prr, 2023ucy, and 2024ljc in the luminous infrared galaxy NGC 6745

@misc{matilainen2026corecollapse,
  title = {{Core-collapse supernovae 2022prr, 2023ucy, and 2024ljc in the luminous infrared galaxy NGC 6745}},
  author = {K. K. Matilainen and E. Kankare and T. Nagao and T. Reynolds and A. Efstathiou and S. Mattila and C. R. Angus and A. Reguitti and Y. -Z. Cai and M. Fraser and L. Galbany and M. González-Bañuelos and C. P. Gutiérrez and T. Kangas and T. L. Killestein and T. Kravtsov and P. Lundqvist and S. Moran and A. Pastorello and A. Popowicz and I. Salmaso and M. Stritzinger},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.21742},
  eprint = {2609.21742},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.21742},
}

TY  - UNPB
TI  - Core-collapse supernovae 2022prr, 2023ucy, and 2024ljc in the luminous infrared galaxy NGC 6745
AU  - K. K. Matilainen
AU  - E. Kankare
AU  - T. Nagao
AU  - T. Reynolds
AU  - A. Efstathiou
AU  - S. Mattila
AU  - C. R. Angus
AU  - A. Reguitti
AU  - Y. -Z. Cai
AU  - M. Fraser
AU  - L. Galbany
AU  - M. González-Bañuelos
AU  - C. P. Gutiérrez
AU  - T. Kangas
AU  - T. L. Killestein
AU  - T. Kravtsov
AU  - P. Lundqvist
AU  - S. Moran
AU  - A. Pastorello
AU  - A. Popowicz
AU  - I. Salmaso
AU  - M. Stritzinger
PY  - 2026
DA  - 2026/09/18
PB  - arXiv
DO  - 10.48550/arxiv.2609.21742
UR  - https://arxiv.org/abs/2609.21742
AB  - The core-collapse supernovae (CCSNe) 2022prr, 2023ucy, and 2024ljc exploded within the central regions of the nearby luminous infrared galaxy (LIRG) NGC6745. We present our follow-up data with the aim to characterise the spectrophotometric evolution of these CCSNe, determine their host-galaxy extinction, and to define their physical nature. The presented spectrophotometric data set covers the optical and near-infrared region for our three supernovae (SNe). The data are analysed and compared to other hydrogen-rich CCSNe, and a host-galaxy extinction value Av is derived based on broadband photometry for each of the targets. A spectral energy distribution (SED) for the host galaxy is constructed, and a combination of different galactic components are fitted to the SED to estimate the intrinsic CCSN rate and the age of the starburst of NGC6745. 2022prr is a SN2009ip-like event, whose light curve evolution consists of two consecutive luminous events A and B with peak magnitudes of Mr = -14.8 and -18.3 mag, respectively. The high degree of V and R-band polarisation (P=2.8%) near maximum light suggests interaction with highly aspherical circumstellar material. The spectral evolution of the SN is dominated by narrow Balmer emission lines, which have a complex evolution over time. 2022prr joins the growing sample of SN2009ip-like events that show early `flash ionisation' features of CIII, NIII, and HeII. 2023ucy is found to be a normal Type IIP SN. However, 2024ljc is a rapidly evolving Type IIb SN with a post-maximum r-band decline of roughly 3.2 mag by +41 d whereas normal IIb SNe decline typically by 1.5+/-0.3 mag during the same timescale. While the events exploded in a LIRG, the SNe are obscured by only moderate V-band host extinctions ranging from 0 to 1 mag. Based on the SED modelling we estimate an age of the host starburst to be 40Myr, and the intrinsic CCSN rate to be 0.4+/-0.1 SN/year.
ER  -