2009/07/30 by J. C. Yee, A. Udalski, T. Sumi +14 · 1 citation
Physics and Astronomy · #astro-ph.EP
paper · pdf · doi:10.1088/0004-637x/703/2/2082
25 pages, 7 figures, submitted to ApJ
arxiv created 2009/07/30 · arxiv updated 2015/05/13
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, Ml=0.64 +/- 0.10 MSun, and its distance, Dl = 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 MEarth ~= 2 MMars with projected separations near the Einstein ring (~3 AU).