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Record 23 of 1500
Production of Star-Grazing and Star-Impacting Planetestimals via Orbital Migration of Extrasolar Planets
External Online Source: doi:10.1086/301171
Author and Affiliation:
Quillen, A. C.(Arizona Univ., Tucson, AZ, United States)
Holman, M.(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, United States)
Abstract: During the orbital migration of a giant extrasolar planet via ejection of planetesimals (as studied by Murray et al. in 1998), inner mean-motion resonances can be strong enough to cause planetesimals to graze or impact the star. We integrate numerically the motions of particles which pass through the 3:1 or 4:1 mean-motion resonances of a migrating Jupiter-mass planet. We find that many particles can be trapped in the 3:1 or 4:1 resonances and pumped to high enough eccentricities that they impact the star. This implies that for a planet migrating a substantial fraction of its semimajor axis, a fraction of its mass in planetesimals could impact the star. This process may be capable of enriching the metallicity of the star at a time when the star is no longer fully convective. Upon close approaches to the star, the surfaces of these planetesimals will be sublimated. Orbital migration should cause continuing production of evaporating bodies, suggesting that this process should be detectable with searches for transient absorption lines in young stars. The remainder of the particles will not impact the star but can be ejected subsequently by the planet as it migrates further inward. This allows the planet to migrate a substantial fraction of its initial semimajor axis by ejecting planetesimals.
Publication Date: Jan 01, 2000
Document ID:
(Acquired Jun 15, 2004)
Subject Category: ASTRONOMY
Document Type: Journal Article
Publication Information: The Astronomical Journal; Volume 119; 397-402
Contract/Grant/Task Num: NAG5-10365
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: Arizona Univ.; Tucson, AZ, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
Availability Source: Other Sources
Availability Notes: Abstract Only
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