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Paper detail

Extreme Magnification Microlensing Event OGLE-2008-BLG-279: Strong Limits on Planetary Companions to the Lens Star

We analyze the extreme high-magnification microlensing event OGLE-2008-BLG-279, which peaked at a maximum magnification of A ~ 1600 on 30 May 2008. The peak of this event exhibits both finite-source effects and terrestrial parallax, from which we determine the mass of the lens, M_l=0.64 +/- 0.10 M_Sun, and its distance, D_l = 4.0 +/- 0.6. We rule out Jupiter-mass planetary companions to the lens star for projected separations in the range 0.5-20 AU. More generally, we find that this event was sensitive to planets with masses as small as 0.2 M_Earth ~= 2 M_Mars with projected separations near the Einstein ring (~3 AU).

preprint2009arXivOpen access
J. C. YeeA. UdalskiT. SumiSubo DongS. KozłowskiJ. C. BirdA. ColeD. HigginsJ. McCormickB. MonardD. PolishookA. ShporerO. Spectorthe OGLEthe microFUNthe MOAthe PLANET collaboration
astro-ph.EP
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J. C. YeeA. UdalskiT. SumiSubo DongS. KozłowskiJ. C. BirdA. ColeD. HigginsJ. McCormickB. MonardD. PolishookA. ShporerO. Spectorthe OGLEthe microFUNthe MOAthe PLANET collaboration

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