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: https://orcid.org/0000-0002-3968-4409, 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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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.
Item Type: | Article |
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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 |
URI: | https://orca.cardiff.ac.uk/id/eprint/158123 |
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