A Long-Duration Luminous Type IIn Supernova KISS15s: Strong Recombination Lines from the Inhomogeneous Ejecta-CSM Interaction Region and Hot Dust Emission from Newly Formed Dust

Abstract

We report the discovery of an SN1988Z-like type IIn supernova KISS15s found in a low-mass star-forming galaxy at redshift z=0.038 during the course of the Kiso Supernova Survey (KISS). KISS15s shows long-duration optical continuum and emission line light curves, indicating that KISS15s is powered by a continuous interaction between the expanding ejecta and dense circumstellar medium (CSM). The H$\alpha$ emission line profile can be decomposed into four Gaussians of narrow, intermediate, blue-shifted intermediate, and broad velocity width components, with a full width at half maximum of $\lesssim 100$, $\sim 2,000$, and $\sim 14,000$ km s${}^{-1}$ for the narrow, intermediate, and broad components, respectively. The presence of the blue-shifted intermediate component, of which the line-of-sight velocity relative to the systemic velocity is about $-5,000$ km s${}^{-1}$, suggests that the ejecta-CSM interaction region has an inhomogeneous morphology and anisotropic expansion velocity. We found that KISS15s shows increasing infrared continuum emission, which can be interpreted as hot dust thermal emission of $T\sim 1,200$ K from newly formed dust in a cool, dense shell in the ejecta-CSM interaction region. The progenitor mass-loss rate, inferred from bolometric luminosity, is $\dot{M}\sim 0.4M_{\odot }{\text{yr}}^{-1}(v_w/40\text{km}{\text{s}}^{-1})$, where $v_w$ is the progenitor's stellar wind velocity. This implies that the progenitor of KISS15s was a red supergiant star or a luminous blue variable that had experienced a large mass-loss in the centuries before the explosion.

43 pages, 29 figures, and 12 tables, accepted for publication in the Astrophysical Journal (ApJ) 2019 January 15

References in corpus (28)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• K-corrections and filter transformations in the ultraviolet, optical, and near infrared
• Achieving better than 1 minute accuracy in the Heliocentric and Barycentric Julian Dates
• Initial Performance of the NEOWISE Reactivation Mission
• Pulsational Pair-Instability Supernovae
• The Sloan Digital Sky Survey-II Supernova Survey: Technical Summary
• Confined Dense Circumstellar Material Surrounding a Regular Type II Supernova: The Unique Flash-Spectroscopy Event of SN 2013fs
• SN 2006tf: Precursor Eruptions and the Optically Thick Regime of Extremely Luminous Type IIn Supernovae
• Rapid formation of large dust grains in the luminous supernova SN 2010jl
• Deriving model-based T${}_e$-consistent chemical abundances in ionised gaseous nebulae
• Barycentric Corrections at 1 cm/s for precise Doppler velocities
• How much 56Ni can be produced in Core-Collapse Supernovae? : Evolution and Explosions of 30 - 100 Msun Stars
• Revisiting the Lick Observatory Supernova Search Volume-Limited Sample: Updated Classifications and Revised Stripped-Envelope Supernova Fractions
• The wind speeds, dust content, and mass-loss rates of evolved AGB and RSG stars at varying metallicity
• PTF11iqb: Cool supergiant mass loss that bridges the gap between Type IIn and normal supernovae
• Dust inflated accretion disc as the origin of the Broad Line Region in Active Galactic Nuclei
• Absolute-Magnitude Distributions of Supernovae
• SN 1994W: An Interacting Supernova or Two Interacting Shells?
• Numerical simulations of super-luminous supernovae of type IIn
• Python Leap Second Management and Implementation of Precise Barycentric Correction (barycorrpy)
• Multi-epoch spectropolarimetry of SN 2009ip: direct evidence for aspherical circumstellar material
• Faint Supernovae and Supernova Impostors: Case studies of SN2002kg/NGC2403-V37 and SN 2003gm
• Endurance of SN 2005ip after a decade: X-rays, radio, and H-alpha like SN 1988Z require long-lived pre-supernova mass loss
• Environments of interacting transients: Impostors and type IIn supernovae
• Kiso Supernova Survey (KISS): Survey Strategy
• Constraining Physical Properties of Type IIn Supernovae through Rise Times and Peak Luminosities
• Near infrared spectroscopy of the type IIn SN 2010jl: evidence for high velocity ejecta
• KOSMOS and COSMOS: New facility instruments for the NOAO 4-meter telescopes

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