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

F. Abe, D. P. Bennett, I. A. Bond, S. Eguchi, Y. Furuta, J. B. Hearnshaw, K. Kamiya, P. M. Kilmartin, Y. Kurata, K. Masuda, Y. Matsubara, Y. Muraki, S. Noda, K. Okajima, A. Rakich, N. J. Rattenbury, T. Sako, T. Sekiguchi, D. J. Sullivan, T. SumiP. J. Tristram, T. Yanagisawa, P. C.M. Yock, A. Gal-Yam, Y. Lipkin, D. Maoz, E. O. Ofek, A. Udalski, O. Szewczyk, K. Zebruń, I. Soszyński, M. K. Szymański, M. Kubiak, G. Pietrzyński, L. Wyrzykowski

Research output: Contribution to journalArticlepeer-review


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 tens 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 tens 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.

Original languageEnglish
Pages (from-to)1264-1266
Number of pages3
Issue number5688
StatePublished - 27 Aug 2004


Dive into the research topics of 'Search for low-mass exoplanets by gravitational microlensing at high magnification'. Together they form a unique fingerprint.

Cite this