Consequences of an eccentric orbit for Fomalhaut b
Authors:
Tamayo
Abstract:
Fomalhaut b is currently the least massive, directly imaged exoplanet candidate. New observation epochs have revealed this object to be moving on a highly eccentric orbit, which sets important new constraints. I consider scenarios where Fomalhaut b is the only object interacting with the debris disc, and ones involving an additional unseen planet. I also investigate the possibility that Fomalhaut b is merely a transient dust cloud in light of the revised eccentric orbit. I argue that the scenario best able to match the observational constraints is a super-Earth Fomalhaut b surrounded by a vast cloud of dust that is generated by a population of irregular satellites, with an undetected ∼Saturn-mass planet orbiting interior to the disc and driving the secular dynamics. Testable predictions are summarized that could differentiate between this scenario and other possibilities.
Tuesday, February 25, 2014
What is the Fomalhaut System's Configuration?
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