DUST TO DUST: THREE YEARS IN THE EVOLUTION OF THE UNUSUAL SN 2008S

We obtained late-time optical and near-IR imaging of SN 2008S with the Large Binocular Telescope, near-IR data with the Hubble Space Telescope, and mid-IR data with the Spitzer Space Telescope. We find that (1) it is again invisible at optical (UBVR) wavelengths to magnitude limits of approximately...

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Bibliographic Details
Published in:The Astrophysical journal 2012-05, Vol.750 (1), p.1-6
Main Authors: SZCZYGIEL, D. M, PRIETO, J. L, KOCHANEK, C. S, STANEK, K. Z, THOMPSON, T. A, BEACOM, J. F, GARNAVICH, P. M, WOODWARD, C. E
Format: Article
Language:English
Subjects:
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Asymptotic giant branch stars
Asymptotic properties
ASYMPTOTIC SOLUTIONS
COSMIC DUST
DETECTION
Dust
Earth, ocean, space
EMISSION
Evolution
Exact sciences and technology
GIANT STARS
LUMINOSITY
NEAR INFRARED RADIATION
Progenitors (astrophysics)
SPACE
Space telescopes
STAR EVOLUTION
Stars
SUPERNOVAE
TELESCOPES
VISIBLE RADIATION
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Summary:We obtained late-time optical and near-IR imaging of SN 2008S with the Large Binocular Telescope, near-IR data with the Hubble Space Telescope, and mid-IR data with the Spitzer Space Telescope. 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 mu m in the mid-IR with a slow, steady decline. The IR detections in 2010 December are consistent with dust emission at a blackbody temperature of T [Asymptotically = to] 640 K and a total luminosity of L [Asymptotically = to]200,000 L sub([middot in circle]), much higher than the L 40,000 L sub([middot in circle]) luminosity of the obscured progenitor star. The local environment also shows no evidence for stars significantly more massive than 10 M sub([middot in circle]), consistent with the progenitor being an 8-10 M sub([middot in circle]) super asymptotic giant branch star.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/750/1/77