HD 207129: Dusty Debris at the Very Outer Edge of a Planetary System

Details HD 207129: Dusty Debris at the Very Outer Edge of a Planetary System HD 207129: Dusty Debris at the Very Outer Edge of a Planetary System

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.1604l&link_type=abstract

American Astronomical Society, ESS meeting #2, #16.04

Astronomy and Astrophysics

Astronomy

Scientific paper

Debris disks are considered natural by-products of planet formation, and as such, they are important witnesses and tracers of this process. These disks of planetesimals and dust are left over where no planets could grow, typically at a system's cold periphery.
The Herschel Open Time Key Program "DUNES" (DUst around NEarby Stars, PI: C. Eiroa) is a volume-limited survey that aims at the detection, characterization, and modeling of circumstellar debris disks as faint as a few times the Edgeworth-Kuiper Belt. Due to Herschel's wavelength coverage, sensitivity, and angular resolving power, the program was able to provide valuable new data points for known disks and to discover additional disks. For about one quarter of the stars in our unbiased sample, significant excess is detected, almost doubling the previous detection rates for Sun-like stars. Notably, a completely new regime of disks was explored, best described as extremely cold, both in terms of temperature and dynamical excitation.
We will present these observational and modeling results, focusing on the particular case of HD 207129. That system is among the brighter, well-resolved objects of our sample and may thus serve as a calibrator for the study of unresolved disks. From HST observations, the dust in that system is known to originate from a belt at about 160 AU from the star -- the most distant birth ring known so far. Due to its sheer size, the surprisingly large grains, and the potentially major role of transport towards the star, that system may well be characterized as a key piece in a so-far poorly sampled region of the jigsaw puzzle of planet formation.

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