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.
Original language | English |
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Article number | A51 |
Journal | Astronomy & Astrophysics |
Volume | 669 |
Number of pages | 22 |
ISSN | 0004-6361 |
DOIs | |
Publication status | Published - 5 Jan 2023 |
- supernovae: general, supernovae: individual: SN 2017hcc, supernovae: individual: ATLAS17lsn, supernovae: individual: PS17fra, IIN SUPERNOVA, X-RAY, LIGHT CURVES, SUPERLUMINOUS SUPERNOVAE, INFRARED-SPECTROSCOPY, OPTICAL OBSERVATIONS, ANALYTIC SOLUTIONS, DUST FORMATION, 2010JL, CALIBRATION
Research areas
ID: 338298085