Direct imaging constraints on planet populations detected by microlensing
作者： E. Buenzli , Maddalena Reggiani , S. P. Quanz , D. Lafrenière , M. R. Meyer
DOI: 10.1051/0004-6361/201118320
关键词:
摘要: Context. Results from gravitational microlensing suggested the existence of a large population free-floating planetary mass objects. The main conclusion this work was partly based on constraints direct imaging survey. This survey determined upper limits for frequency stars that harbor giant exoplanets at orbital separations. Aims. We want to verify what extent do indeed constrain results. Methods. examine current derivation used in study and re-analyze data corresponding focus semi-major axis ranges are most relevant context also consider new results recent M-dwarf as these objects typically host planets detected by microlensing. Results. find currently applied probably underestimated. means larger fraction than assumed may gas Also, way limit is estimate not strictly correct. If surface density around M-dwarfs described d fPlanet ∝ ada, we β <∼ 0.5−0.6 consistent with different observational studies probing axes between ∼0.03–30 AU. Conclusions. Having higher have separations probed implies more potentially bound rather freefloating. rising out ∼30 Future surveys will show above mentioned range valid bound.
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