Hostname: page-component-586b7cd67f-dlnhk Total loading time: 0 Render date: 2024-11-29T03:57:24.839Z Has data issue: false hasContentIssue false
  • English
  • Français

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: [email protected]
David P. Bennett
Affiliation:
Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA email: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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

Gould, A., Dong, S., Gaudi, B. S., et al. 2010, ApJ, 720, 1073 Google Scholar
Cassan, A., Kubas, D., Beaulieu, J.-P., et al. 2012, Nature, 481, 167 Google Scholar
Rhie, S. H., Bennett, D. P., Becker, A. C., et al. 2000, ApJ, 533, 378 Google Scholar