M. D. Albrow et al 2001 ApJ 556 L113 doi:10.1086/323141
Limits on the Abundance of Galactic Planets From 5 Years of PLANET Observations
FREEM. D. Albrow1,2, J. An3, J.-P. Beaulieu4, J. A. R. Caldwell5, D. L. DePoy3, M. Dominik6, B. S. Gaudi3,7,8, A. Gould3, J. Greenhill9, K. Hill9, S. Kane2,9, R. Martin10, J. Menzies5, R. M. Naber6, J.-W. Pel6, R. W. Pogge3, K. R. Pollard1, P. D. Sackett6, K. C. Sahu2, P. Vermaak5, P. M. Vreeswijk6,11, R. Watson9 and A. Williams10 (The PLANET Collaboration)
Show affiliationsWe search for signatures of planets in 43 intensively monitored microlensing events that were observed between 1995 and 1999. Planets would be expected to cause a short-duration (~1 day) deviation on the smooth, symmetric light curve produced by a single lens. We find no such anomalies and infer that less than one-third of the ~0.3 M
stars that typically comprise the lens population have Jupiter mass companions with semimajor axes in the range of 1.5 AU < a < 4 AU. Since orbital periods of planets at these radii are 3-15 yr, the outer portion of this region is currently difficult to probe with any other technique.
- Subject headings
gravitational lensing; planetary systems; stars: late-type; stars: low-mass, brown dwarfs; techniques: photometric
- Dates
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Issue 2 (2001 August 1)
Received 2000 August 7, accepted for publication 2001 July 9
Published 2001 July 16
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Limits on the Abundance of Galactic Planets From 5 Years of PLANET Observations
M. D. Albrow et al 2001 ApJ 556 L113
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