A long life of excess: The interacting transient SN 2017hcc

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
A long life of excess: The interacting transient SN 2017hcc

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
Katso/Avaa
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EDP SCIENCES S A
doi:10.1051/0004-6361/202244565
URI
https://doi.org/10.1051/0004-6361/202244565
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Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2023031632025
Tiivistelmä
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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