The Formation and Evolution of Planetary Systems: First Results from a Spitzer Legacy Science Program

• Main Authors: Meyer, M. R, Hillenbrand, L. A, Backman, D. E, Beckwith, S. V. W, Bouwman, J, Brooke, T. Y, Carpenter, J. M, Cohen, M, Gorti, U, Henning, T, Hines, D. C, Hollenbach, D, Kim, J. S, Lunine, J, Malhotra, R, Mamajek, E. E, Metchev, S, Moro--Martin, A, Morris, P, Najita, J, Padgett, D. L, Rodmann, J, Silverstone, M. D, Soderblom, D. R, Stauffer, J. R, Stobie, E. B, Strom, S. E, Watson, D. M, Weidenschilling, S. J, Wolf, S, Young, E, Engelbracht, C. W, Gordon, K. D, Misselt, K, Morrison, J, Muzerolle, J, Su, K
• Format: Journal Article
• Language: English
• Published: 11-06-2004
• Subjects: Physics - Astrophysics of Galaxies; Physics - Cosmology and Nongalactic Astrophysics; Physics - Earth and Planetary Astrophysics; Physics - High Energy Astrophysical Phenomena; Physics - Instrumentation and Methods for Astrophysics; Physics - Solar and Stellar Astrophysics
• DOI: 10.48550/arxiv.astro-ph/0406301

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.