Dust to Dust: 3 years in the Evolution of the Unusual SN 2008S

Details Dust to Dust: 3 years in the Evolution of the Unusual SN 2008S Dust to Dust: 3 years in the Evolution of the Unusual SN 2008S

2012-02-01

arxiv.org/abs/1202.0279v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

6 pages, 4 figures, 1 table, submitted to ApJ; This paper has substantial text overlap with arXiv:1007.0011, but is significan

Scientific paper

We obtained late-time optical and near-IR imaging of SN 2008S with the Large Binocular Telescope (LBT), near-IR data with the Hubble Space Telescope (HST), and mid-IR data with the Spitzer Space Telescope (SST). We find that (1) it is again invisible at optical (UBVR) wavelengths to magnitude limits of approximately 25 mag, (2) while detected in the near-IR (H) at approximately 24.8 mag, it is fading rapidly, and (3) it is still brighter than the progenitor at 3.6 and 4.5 microns in the mid-IR with a slow, steady decline. The IR detections in December 2010 are consistent with dust emission at a blackbody temperature of T ~ 640 K and a total luminosity of L ~ 200000 Lsun, much higher than the L ~ 40000 Lsun luminosity of the obscured progenitor star. The local environment also shows no evidence for massive (M >= 10 Msun) stars in the vicinity of the transient, consistent with the progenitor being a massive AGB star.

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