Does the presence of planets affect the frequency and properties of extrasolar Kuiper belts? Results from the Herschel debris and dunes surveys

Moro-Martin, A. and Marshall, J. P. and Kennedy, G. and Sibthorpe, B. and Matthews, B. C. and Eiroa, C. and Wyatt, M. C. and Lestrade, J. -F. and Maldonado, J. and Rodriguez, D. and Greaves, J. S. and Montesinos, B. and Mora, A. and Booth, M. and Duchene, G. and Wilner, D. and Horner, J. (2015) Does the presence of planets affect the frequency and properties of extrasolar Kuiper belts? Results from the Herschel debris and dunes surveys. The Astrophysical Journal, 801 (2). p. 143. ISSN 0004-637X

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The study of the planet–debris disk connection can shed light on the formation and evolution of planetary systems and may help 'predict' the presence of planets around stars with certain disk characteristics. In preliminary analyses of subsamples of the Herschel DEBRIS and DUNES surveys, Wyatt et al. and Marshall et al. identified a tentative correlation between debris and the presence of low-mass planets. Here we use the cleanest possible sample out of these Herschel surveys to assess the presence of such a correlation, discarding stars without known ages, with ages Gyr, and with binary companions AU to rule out possible correlations due to effects other than planet presence. In our resulting subsample of 204 FGK stars, we do not find evidence that debris disks are more common or more dusty around stars harboring high-mass or low-mass planets compared to a control sample without identified planets. There is no evidence either that the characteristic dust temperature of the debris disks around planet-bearing stars is any different from that in debris disks without identified planets, nor that debris disks are more or less common (or more or less dusty) around stars harboring multiple planets compared to single-planet systems. Diverse dynamical histories may account for the lack of correlations. The data show a correlation between the presence of high-mass planets and stellar metallicity, but no correlation between the presence of low-mass planets or debris and stellar metallicity. Comparing the observed cumulative distribution of fractional luminosity to those expected from a Gaussian distribution in logarithmic scale, we find that a distribution centered on the solar system's value fits the data well, while one centered at 10 times this value can be rejected. This is of interest in the context of future terrestrial planet detection and characterization because it indicates that there are good prospects for finding a large number of debris disk systems (i.e., with evidence of harboring planetesimals, the building blocks of planets) with exozodiacal emission low enough to be appropriate targets for an ATLAST-type mission to search for biosignatures.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version made accessible, in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - No Department
Date Deposited: 25 Mar 2015 01:06
Last Modified: 24 Mar 2017 02:54
Uncontrolled Keywords: circumstellar matter; disk interactions; infrared; stars; interplanetary medium; Kuiper Belt; planetary systems
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020108 Planetary Science (excl. Extraterrestrial Geology)
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020109 Space and Solar Physics
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1088/0004-637X/801/2/143

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