A long life of excess: The interacting transient SN 2017hcc
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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 greater than or similar to+800 d.
Originalsprog | Engelsk |
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Artikelnummer | A51 |
Tidsskrift | Astronomy & Astrophysics |
Vol/bind | 669 |
Antal sider | 22 |
ISSN | 0004-6361 |
DOI | |
Status | Udgivet - 5 jan. 2023 |
ID: 338298085