Journal
ASTROPHYSICAL JOURNAL
Volume 703, Issue 2, Pages 2082-2090Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/703/2/2082
Keywords
gravitational lensing; planetary systems; planetary systems: formation
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Funding
- Science and Technology Facilities Council [ST/G001987/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0757888] Funding Source: National Science Foundation
- STFC [ST/G001987/1] Funding Source: UKRI
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We analyze the extreme high-magnification microlensing event OGLE-2008-BLG-279, which peaked at a maximum magnification of A similar to 1600 on 2008 May 30. 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-circle dot, and its distance, D-l = 4.0 +/- 0.6 kpc. 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-circle dot similar or equal to 2 (MMars) with projected separations near the Einstein ring (similar to 3 AU).
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