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

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. ORCID:, Leloudas, G., Müller-Bravo, T. E., Nicholl, M., Reguitti, A., Shahbandeh, M., Smartt, S. J., Tartaglia, L. and Young, D. R. 2023. A long life of excess: The interacting transient SN 2017hcc. Astronomy & Astrophysics 669 , A51. 10.1051/0004-6361/202244565

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: EDP Sciences
ISSN: 0004-6361
Date of First Compliant Deposit: 28 March 2023
Date of Acceptance: 22 October 2022
Last Modified: 18 May 2023 17:46

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