A1 Refereed original research article in a scientific journal
A long life of excess: The interacting transient SN 2017hcc
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 TW, Della Valle M, Dennefeld M, Elias-Rosa N, Galbany L, Galindo-Guil FJ, Gromadzki M, Hiramatsu D, Inserra C, Leloudas G, Muller-Bravo TE, Nicholl M, Reguitti A, Shahbandeh M, Smartt SJ, Tartaglia L, Young DR
Publisher: EDP SCIENCES S A
Publication year: 2023
Journal: Astronomy and Astrophysics
Journal name in source: ASTRONOMY & ASTROPHYSICS
Journal acronym: ASTRON ASTROPHYS
Article number: A51
Volume: 669
Number of pages: 22
ISSN: 0004-6361
DOI: https://doi.org/10.1051/0004-6361/202244565
Web address : https://doi.org/10.1051/0004-6361/202244565
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/178896633
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 greater than or similar to+800 d.
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