Discovery of a Jupiter/Saturn Analog with Gravitational Microlensing
Abstract
Searches for extrasolar planets have uncovered an astonishing diversity of planetary systems, yet the frequency of solar system analogs remains unknown. The gravitational microlensing planet search method is potentially sensitive to multiple-planet systems containing analogs of all the solar system planets except Mercury. We report the detection of a multiple-planet system with microlensing. We identify two planets with masses of ∼0.71 and ∼0.27 times the mass of Jupiter and orbital separations of ∼2.3 and ∼4.6 astronomical units orbiting a primary star of mass ∼0.50 solar mass at a distance of ∼1.5 kiloparsecs. This system resembles a scaled version of our solar system in that the mass ratio, separation ratio, and equilibrium temperatures of the planets are similar to those of Jupiter and Saturn. These planets could not have been detected with other techniques; their discovery from only six confirmed microlensing planet detections suggests that solar system analogs may be common.
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We acknowledge the following support: NSF AST-042758 (A.G., S.D.); NASA NNG04GL51G (D.L.D., A.G., R.W.P.); NASA/JPL 1226901 (D.L.D., B.S.G., A.G.); Polish Ministerstwo Nauki i Szkolnictwa Wyższego MNiSW N20303032/4275 (OGLE); NSF AST-0708890 and NASA NNX07AL71G (D.P.B.); Science Research Center, Korea Science and Engineering Foundation (C.H.); Korea Astronomy and Space Science Institute (B.-G.P.); Deutsche Forschungsgemeinschaft (C.S.B.); Particle Physics and Astronomy Research Council (PPARC), European Union Sixth Framework Programme ANGLES (Ł.W., N.J.R.); PPARC (RoboNet); Israel Science Foundation (D.M.); Marsden Fund of New Zealand; Japan Ministry of Education, Culture, Sports, Science and Technology; and Japan Society for the Promotion of Science (MOA). RoboNet-1.0 is funded by the Science and Technology Facilities Council (STFC) and operates in conjunction with the eScience Telescopes for Astronomical Research project, which supports A.A. and which is jointly funded by the Department of Trade and Industry, STFC, and the Engineering and Physical Sciences Research Council. K.H.C.'s, S.N.'s and B.M.'s work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344. M.D. is a Royal Society University Research Fellow. We thank the MDM staff for their support. We thank D. Warren for financial support for the Mt. Canopus Observatory and M. Bode, D. Bramich, C. Mottram, S. Fraser, and C. Snodgrass for contributions to the RoboNet data.
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Science
Volume 319 | Issue 5865
15 February 2008
15 February 2008
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American Association for the Advancement of Science.
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Received: 19 October 2007
Accepted: 9 January 2008
Published in print: 15 February 2008
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