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24 April 2024

» arxiv » astro-ph/0406301

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The Formation and Evolution of Planetary Systems: First Results from a Spitzer Legacy Science Program
M.R. Meyer ; L.A. Hillenbrand ; D.E. Backman ; S.V.W. Beckwith ; J. Bouwman ; T.Y. Brooke ; J.M. Carpenter ; M. Cohen ; U. Gorti ; T. Henning ; D.C. Hines ; D. Hollenbach ; J.S. Kim ; J. Lunine ; R. Malhotra ; E.E. Mamajek ; S. Metchev ; A. Moro--Martin ; P. Morris ; J. Najita ; D.L. Padgett ; J. Rodmann ; M.D. Silverstone ; D.R. Soderblom ; J.R. Stauffer ; E.B. Stobie ; S.E. Strom ; D.M. Watson ; S.J. Weidenschilling ; S. Wolf ; E. Young ; C.W. Engelbracht ; K.D. Gordon ; K. Misselt ; J. Morrison ; J. Muzerolle ; K. Su ;
Date:	11 Jun 2004
Subject:	astro-ph
Abstract:	We present 3-160 micron photometry obtained with the IRAC and MIPS instruments for the first five targets from the Spitzer Legacy Science Program "Formation and Evolution of Planetary Systems" and 4-35 micron spectro-photometry obtained with the IRS for two sources. We discuss in detail our observations of the debris disks surrounding HD 105 (G0V, 30 +- 10 Myr) and HD 150706 (G3V, ~ 700 +- 300 Myr). For HD 105, possible interpretations include large bodies clearing the dust inside of 45 AU or a reservoir of gas capable of sculpting the dust distribution. The disk surrounding HD 150706 also exhibits evidence of a large inner hole in its dust distribution. Of the four survey targets without previously detected IR excess, spanning ages 30 Myr to 3 Gyr, the new detection of excess in just one system of intermediate age suggests a variety of initial conditions or divergent evolutionary paths for debris disk systems orbiting solar-type stars.
Source:	arXiv, astro-ph/0406301
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