Evidence for Pre-existing Dust in the Bright Type IIn SN 2010jl

Type Journal Article
Names J. E. Andrews, Geoffrey C. Clayton, R. Wesson, B. E. K. Sugerman, M. J. Barlow, J. Clem, B. Ercolano, J. Fabbri, J. S. Gallagher, A. Landolt, M. Meixner, M. Otsuka, D. Riebel, D. L. Welch
Publication The Astronomical Journal
Volume 142
Issue 2
Pages 45
Date August 1, 2011
URL http://adsabs.harvard.edu/abs/2011AJ....142...45A
Library Catalog NASA ADS
Abstract SN 2010jl was an extremely bright, Type IIn supernova (SN) which showed a significant infrared (IR) excess no later than 90 days after explosion. We have obtained Spitzer 3.6 and 4.5 μm and JHK observations of SN 2010jl ~90 days post-explosion. Little to no reddening in the host galaxy indicated that the circumstellar material lost from the progenitor must lie in a torus inclined out of the plane of the sky. The likely cause of the high mid-IR flux is the reprocessing of the initial flash of the SN by pre-existing circumstellar dust. Using a three-dimensional Monte Carlo radiative-transfer code, we have estimated that between 0.03 and 0.35 M sun of dust exists in a circumstellar torus around the SN located 6 × 1017 cm away from the SN and inclined between 60° and 80° to the plane of the sky. On day 90, we are only seeing the illumination of approximately 5% of this torus, and expect to see an elevated IR flux from this material up until day ~ 450. It is likely this dust was created in a luminous blue variable (LBV) like mass-loss event of more than 3 M sun, which is large but consistent with other LBV progenitors such as η Carinae.
Tags DUST, circumstellar matter, extinction, supernovae: general, supernovae: individual: SN 2010jl
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