Sublimation of Icy Planetesimals Around Main Sequence Stars--Common Dust Temperatures & Multiple Components

Details Sublimation of Icy Planetesimals Around Main Sequence Stars--Common Dust Temperatures & Multiple Components Sublimation of Icy Planetesimals Around Main Sequence Stars--Common Dust Temperatures & Multiple Components

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733908m&link_type=abstract

American Astronomical Society, AAS Meeting #217, #339.08; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We compare the properties of warm dust emission from main-sequence A-type stars to those of dust around solar-type sources with similar Spitzer Space Telescope IRS/MIPS data and similar ages. Both samples have spectral energy distributions which show evidence of multiple components. Over the range of stellar types considered, we obtain nearly the same characteristic dust temperatures ( 190 K & 55 K for the inner & outer dust components respectively)--just above the ice line for the inner belts. The inner-belt temperature is readily explained if populations of grains are being released by sublimation of ice from icy planetesimals. Evaporation of comets at 170 K transports particles into an inner/warmer belt, where the super thermal grains left behind are found with Tdust >=190 K. 27 of the 50 A-type sources with warm excess are detected with Spitzer/MIPS at 70 µm (S/N > 3); the 50% rate of detection is comparable to the solar-type star sample where 9 of the 19 objects are also seen at MIPS 70 µm.
This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407. Development of MIPS was funded by NASA through the Jet Propulsion Laboratory, subcontract 960785. This work was also partially supported by contract 1255094 from Caltech/JPL to the University of Arizona.

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