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

分类： 天文学 >> 天文学 提交时间： 2023-02-19

S. Moran M. Fraser R. Kotak A. Pastorello S. Benetti S. J. Brennan C. P. Gutiérrez E. Kankare H. Kuncarayakti S. Mattila T. M. Reynolds J. P. Anderson P. J. Brown S. Campana K. C. Chambers T. -W. Chen M. Della Valle M. Dennefeld N. Elias-Rosa L. Galbany

摘要： 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 $\pm$ 2 days, ATLAS $o$ band) and high luminosity (peaking at $-$20.78 $\pm$ 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 days. 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 >$\sim$+800 days.

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