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

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 $\pm$ 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.

Accepted to A&A

References in corpus (18)

• The Zwicky Transient Facility: System Overview, Performance, and First Results
• In the Realm of the Hubble tension $-$ a Review of Solutions
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• Initial Performance of the NEOWISE Reactivation Mission
• PESSTO : survey description and products from the first data release by the Public ESO Spectroscopic Survey of Transient Objects
• SOUSA: the Swift Optical/Ultraviolet Supernova Archive
• A Massive Progenitor of the Luminous Type IIn Supernova 2010jl
• Gaia Photometric Science Alerts
• Numerical simulations of super-luminous supernovae of type IIn
• Massive stars exploding in a He-rich circumstellar medium III. SN 2006jc: IR echoes from new and old dust in the progenitor CSM
• Modeling the signatures of interaction in Type II supernovae: UV emission, high-velocity features, broad-boxy profiles
• The Automated Photometry Of Transients (AutoPhOT) pipeline
• Disentangling Dust Components in SN 2010jl: The First 1400 Days
• On the observational behaviour of the highly polarized Type IIn supernova SN 2017hcc
• Near infrared spectroscopy of the type IIn SN 2010jl: evidence for high velocity ejecta
• A code for robust astrometric solution of astronomical images
• The luminous Type IIN supernova SN 2017hcc: Infrared bright, X-ray and radio faint
• Dust Models for the Extinction of Type IIn Supernova SN 2010jl