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Limits on the Abundance of Galactic Planets from 5 Years of PLANET Observations


Albrow, MD and An, J and Beaulieu, JP and Caldwell, JAR and DePoy, DL and Dominik, M and Gaudi, BS and Gould, A and Greenhill, JG and Hill, KM and Kane, S and Martin, R and Menzies, J and Naber, RM and Pel, JW and Pogge, RW and Pollard, KR and Sackett, PD and Sahu, KC and Vermaak, P and Vreeswijk, PM and Watson, RD and Williams, A, Limits on the Abundance of Galactic Planets from 5 Years of PLANET Observations, The Astrophysical Journal, 556, (2) pp. L113-L116. ISSN 0004-637X (2001) [Refereed Article]

DOI: doi:10.1086/323141


We 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.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Greenhill, JG (Dr John Greenhill)
UTAS Author:Hill, KM (Dr Kym Hill)
UTAS Author:Kane, S (Dr Stephen Kane)
UTAS Author:Watson, RD (Dr Bob Watson)
ID Code:22105
Year Published:2001
Web of Science® Times Cited:54
Deposited By:Physics
Deposited On:2001-08-01
Last Modified:2011-11-29

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