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Planet Frequency beyond the Snow Line from MOA-II Microlensing Survey

Published online by Cambridge University Press:  27 October 2016

Daisuke Suzuki ,
David P. Bennett  and
the MOA collaboration
Daisuke Suzuki
Affiliation:
Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA email: dsuzuki@nd.edu
David P. Bennett
Affiliation:
Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA email: dsuzuki@nd.edu
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Abstract

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We present the first statistical analysis of the exoplanet frequency using planets found by a microlensing survey rather than follow-up observations. We present an analysis of 2007-2012 MOA (Microlensing Observations in Astrophysics) survey data to derive the planet frequency as a function of the planet/star mass ratio, q and separation, s, relative to the Einstein radius. Our sample includes 1472 microlensing events, including 22 planetary events and 1 ambiguous event with possible planetary and stellar binary solutions. The detection efficiency is calculated for each event and we employ a Bayesian analysis to deal with the ambiguous event. A broken power law model is used to fit the mass ratio function and we find a break and likely peak at q ~1.0−4.

Keywords

gravitational lensing: micro - planetary systems
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29A: Astronomy in Focus , August 2015 , pp. 220
Copyright
Copyright © International Astronomical Union 2016 

References

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