Other
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.0506m&link_type=abstract
American Astronomical Society, DPS meeting #41, #5.06
Other
Scientific paper
The three gas giants directly-imaged orbiting HR 8799 comprise the first planetary system detected at wide separations around a main sequence star. Core accretion scenarios, already strained at the outer limits of our solar system, have difficulty explaining planet formation at the larger distances of the HR 8799 planets, even around a central A star. Formation by gravitational instability (GI) is most plausible for massive planets at large separations. We demonstrate that for GI to form the planets around HR 8799, the protoplanetary disk must have passed through a fine-tuned region of parameter space at its transition from the Class I to the Class II phase. Orbital stability requirements imply that the HR 8799 planets occupy at least one and possibly two mean motion resonances, suggesting that they migrated toward one another and may have migrated substantially from their formation locations. We will discuss how the HR 8799 system constrains the formation and migration of distant planets.
Kratter Kaitlin
Murray-Clay Ruth
Youdin Andrew
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