A long life of excess: The interacting transient SN 2017hcc Academic Article uri icon

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 2 days, ATLAS o band) and high luminosity (peaking at 20.78 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 d. 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 +800 d.

published proceedings

  • ASTRONOMY & ASTROPHYSICS

altmetric score

  • 10.33

author list (cited authors)

  • Moran, S., Fraser, M., Kotak, R., Pastorello, A., Benetti, S., Brennan, S. J., ... Young, D. R.

citation count

  • 3

complete list of authors

  • Moran, S||Fraser, M||Kotak, R||Pastorello, A||Benetti, S||Brennan, SJ||Gutierrez, CP||Kankare, E||Kuncarayakti, H||Mattila, S||Reynolds, TM||Anderson, JP||Brown, PJ||Campana, S||Chambers, KC||Chen, T-W||Della Valle, M||Dennefeld, M||Elias-Rosa, N||Galbany, L||Galindo-Guil, FJ||Gromadzki, M||Hiramatsu, D||Inserra, C||Leloudas, G||Mueller-Bravo, TE||Nicholl, M||Reguitti, A||Shahbandeh, M||Smartt, SJ||Tartaglia, L||Young, DR

publication date

  • January 2023