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    Science. 2004 Aug 27;305(5688):1264-6.

    Search for low-mass exoplanets by gravitational microlensing at high magnification.

    Abe F, Bennett DP, Bond IA, Eguchi S, Furuta Y, Hearnshaw JB, Kamiya K, Kilmartin PM, Kurata Y, Masuda K, Matsubara Y, Muraki Y, Noda S, Okajima K, Rakich A, Rattenbury NJ, Sako T, Sekiguchi T, Sullivan DJ, Sumi T, Tristram PJ, Yanagisawa T, Yock PC, Gal-Yam A, Lipkin Y, Maoz D, Ofek EO, Udalski A, Szewczyk O, Zebrun K, Soszynski I, Szymanski MK, Kubiak M, Pietrzynski G, Wyrzykowski L.

    Source

    Solar Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-01, Japan.

    Abstract

    Observations of the gravitational microlensing event MOA 2003-BLG-32/OGLE 2003-BLG-219 are presented, for which the peak magnification was over 500, the highest yet reported. Continuous observations around the peak enabled a sensitive search for planets orbiting the lens star. No planets were detected. Planets 1.3 times heavier than Earth were excluded from more than 50% of the projected annular region from approximately 2.3 to 3.6 astronomical units surrounding the lens star, Uranus-mass planets were excluded from 0.9 to 8.7 astronomical units, and planets 1.3 times heavier than Saturn were excluded from 0.2 to 60 astronomical units. These are the largest regions of sensitivity yet achieved in searches for extrasolar planets orbiting any star.

    PMID:
    15333833
    [PubMed]

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