Orbital fitting of imaged planetary companions with high eccentricities and unbound orbits

Author： Beust H.   Bonnefoy M.   Maire A.-L.   Ehrenreich D.   Lagrange A.-M.   Chauvin G.  

Publisher： Edp Sciences

E-ISSN： 1432-0746|587|issue|A89-A89

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.587, Iss.issue, 2016-02, pp. : A89-A89

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

Context. Regular follow-up of imaged companions to main-sequence stars often allows a projected orbital motion to be detected. Markov chain Monte Carlo (MCMC) has become very popular recent years for fitting and constraining their orbits. Some of these imaged companions appear to move on very eccentric, possibly unbound orbits. This is, in particular, the case for the exoplanet Fomalhaut b and the brown dwarf companion PZ Tel B on which we focus here.

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