학술논문
A long life of excess: The interacting transient SN 2017hcc
Document Type
Working Paper
Author
Moran, S.; Fraser, M.; Kotak, R.; Pastorello, A.; Benetti, S.; Brennan, S. J.; Gutiérrez, C. P.; Kankare, E.; Kuncarayakti, H.; Mattila, S.; Reynolds, T. M.; Anderson, J. P.; Brown, P. J.; Campana, S.; Chambers, K. C.; Chen, T. -W.; Della Valle, M.; Dennefeld, M.; Elias-Rosa, N.; Galbany, L.; Galindo-Guil, F. J.; Gromadzki, M.; Hiramatsu, D.; Inserra, C.; Leloudas, G.; Müller-Bravo, T. E.; Nicholl, M.; Reguitti, A.; Shahbandeh, M.; Smartt, S. J.; Tartaglia, L.; Young, D. R.
Source
A&A 669, A51 (2023)
Subject
Language
Abstract
In this study we present the results of a five-year follow-up campaign of the long-lived type IIn supernova SN 2017hcc, found in a spiral dwarf host of near-solar metallicity. The long rise time (57 $\pm$ 2 days, ATLAS $o$ band) and high luminosity (peaking at $-$20.78 $\pm$ 0.01 mag in the ATLAS $o$ band) point towards an interaction of massive ejecta with massive and dense circumstellar material (CSM). The evolution of SN 2017hcc is slow, both spectroscopically and photometrically, reminiscent of the long-lived type IIn, SN 2010jl. An infrared (IR) excess was apparent soon after the peak, and blueshifts were noticeable in the Balmer lines starting from a few hundred days, but appeared to be fading by around +1200 days. We posit that an IR light echo from pre-existing dust dominates at early times, with some possible condensation of new dust grains occurring at epochs >$\sim$+800 days.
Comment: Accepted to A&A
Comment: Accepted to A&A