Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dda....40.0404m&link_type=abstract
American Astronomical Society, DDA meeting #40, #4.04; Bulletin of the American Astronomical Society, Vol. 41, p.897
Astronomy and Astrophysics
Astronomy
Scientific paper
The recent direct detections of planets orbiting Fomalhaut and HR 8799 have opened a new population of planets to discovery and characterization. Unlike those found using radial velocities or transits, directly detected planets have no direct measurements of their masses or radii. I will discuss how dynamical stability constrains the masses of the three planets around HR 8799. I will demonstrate that the system can only survive until today if the inner two planets are in 2:1 mean motion resonance and show that the three planets may occupy a 4:2:1 resonance. I will review current models of the formation and migration of giant planets at large orbital distances and discuss how the newly imaged systems can help us constrain these models.
Fabrycky Daniel
Murray-Clay Ruth
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