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Signposts of Multiple Planets in Debris Disks

Published online by Cambridge University Press:  06 January 2014

Kate Y. L. Su  and
G. H. Rieke
Kate Y. L. Su
Affiliation:
Steward Observatory, University of Arizona, 933 N Cherry Avenue, AZ 85750, USA email: ksu@as.arizona.edu, grieke@as.arizona.edu
G. H. Rieke
Affiliation:
Steward Observatory, University of Arizona, 933 N Cherry Avenue, AZ 85750, USA email: ksu@as.arizona.edu, grieke@as.arizona.edu
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Abstract

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We review the nearby debris disk structures revealed by multi-wavelength images from Spitzer and Herschel, and complemented with detailed spectral energy distribution modeling. Similar to the definition of habitable zones around stars, debris disk structures should be identified and characterized in terms of dust temperatures rather than physical distances so that the heating power of different spectral type of stars is taken into account and common features in disks can be discussed and compared directly. Common features, such as warm (~150 K) dust belts near the water-ice line and cold (~50 K) Kuiper-belt analogs, give rise to our emerging understanding of the levels of order in debris disk structures and illuminate various processes about the formation and evolution of exoplanetary systems. In light of the disk structures in the debris disk twins (Vega and Fomalhaut), and the current limits on the masses of planetary objects, we suggest that the large gap between the warm and cold dust belts is the best signpost for multiple (low-mass) planets beyond the water-ice line.

Keywords

circumstellar matter – infrared: starsplanetary systems
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S299: Exploring the Formation and Evolution of Planetary Systems , June 2013 , pp. 318 - 321
Copyright
Copyright © International Astronomical Union 2013 

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