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OGLE-2012-bLG-0950Lb: the First Planet Mass Measurement From Only Microlens Parallax and Lens FluxWe report the discovery of a microlensing planet OGLE-2012-BLG-0950Lb with a planet/host mass ratio Periapsis Approx. = 2 x10(exp. -4). A long term distortion detected in both MOA and OGLE light curve can be explained by themicrolens parallax due to the Earths orbital motion around the Sun. Although the finite source effect is not detected, we obtain the lens flux by the high resolution Keck AO observation. Combining the microlens parallax and the lens flux reveal the nature of the lens: a planet with mass of M(sub p) = 35(+17/-)M compared to Earth is orbiting around an M-dwarf with mass of M(sub host) = 0.56(+0.12/-0.16) M compared to the Sun with a planet-host projected separation of r1 = 2.7(+0.6/-0.7) au located at Luminosity Distance = 3.0(+0.8/-1.1) kpc from us. This is the first mass measurement from only microlens parallax and the lens flux without the finite source effect. In the coming space observation-era with Spitzer, K2, Euclid, and WFIRST, we expect many such events for which we will not be able to measure any finite source effect. This work demonstrates an ability of mass measurements in such events.
Document ID
Document Type
Reprint (Version printed in journal)
Koshimoto, N. (Osaka Univ. Osaka, Japan)
Udalski, A. (Warsaw Univ. Observatory Warsaw, Poland)
Beaulieu, J. P. (Paris Univ. France)
Sumi, T. (Osaka Univ. Osaka, Japan)
Bennett, D. P. (Notre Dame Univ. Notre Dame, IN, United States)
Bond, I. A. (Massey University Auckland Auckland, New Zealand)
Rattenbury, N. (Auckland Univ. New Zealand)
Fukui, A. (National Astronomical Observatory Okayama, Japan)
Bhattacharya, A. (Notre Dame Univ. Notre Dame, IN, United States)
Suzuki, D. (Notre Dame Univ. Notre Dame, IN, United States)
Date Acquired
April 11, 2017
Publication Date
December 14, 2016
Publication Information
Publication: The Astronomical Journal
Volume: 153
Issue: 1
ISSN: 0004-6256
Subject Category
Numerical Analysis
Report/Patent Number
Funding Number(s)
Distribution Limits
microlens parallax