SN2002bu -- Another SN2008S-like Transient
D. M. Szczygiel (1), C. S. Kochanek (1,2), X. Dai (3) ((1) Department, of Astronomy, The Ohio State University, (2) Center for Cosmology and, AstroParticle Physics, The Ohio State University, (3) Department of Physics, and Astronomy, University of Oklahoma)

TL;DR
This study tracks the decade-long evolution of SN2002bu, a transient similar to SN2008S, revealing its fading, dust obscuration, and shock-driven emission, with implications for understanding such stellar explosions.
Contribution
It provides detailed multi-wavelength observations and models of SN2002bu's evolution, clarifying its nature and relation to the SN2008S class of transients.
Findings
Significant fading of near-IR source from 2004 to 2012.
Dust obscuration remains high, with optical depth decreasing over time.
X-ray emission not detected, consistent with shock-powered emission.
Abstract
We observed SN2002bu in the near-IR with the Hubble Space Telescope, the mid-IR with the Spitzer Space Telescope and in X-rays with Swift 10 years after the explosion. If the faint L_H\sim100 Lsun HST near-IR source at the transient position is the near-IR counterpart of SN2002bu, then the source has dramatically faded between 2004 and 2012, from L\sim10^6.0 Lsun to L\sim10^4.5 Lsun. It is still heavily obscured, tau_V\sim5 in graphitic dust models, with almost all the energy radiated in the mid-IR. The radius of the dust emission is increasing as R\simt^(0.7+/-0.4) and the optical depth is dropping as tau_V\simt^(-1.3+/-0.4). The evolution expected for an expanding shell of material, tau_V\sim1/t^2, is ruled out at approximately 2 sigma while the tau_V\simt^(-0.8) to t^(-1) optical depth scaling for a shock passing through a pre-existing wind is consistent with the data. If the near-IR…
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