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arXiv · 1507.08914

Confirmation of the OGLE-2005-BLG-169 planet signature and characteristics with lens-source proper motion detection

V. Batista·J. -P. Beaulieu·D. P. Bennett·A. Gould·J. -B. Marquette·A. Fukui·A. Bhattacharya
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Abstract

We present Keck NIRC2 high angular resolution adaptive optics observations of the microlensing event OGLE-2005-BLG-169, taken 8.21 years after the discovery of this planetary system. For the first time for a microlensing planetary event, the source and the lens are completely resolved, providing a precise measurement of their heliocentric relative proper motion, $μ_{\rm{rel},\rm{helio}}=7.44 \pm 0.17$ mas yr$^{-1}$. This confirms and refines the initial model presented in the discovery paper and rules out a range of solutions that were allowed by the microlensing light curve. This is also the first time that parameters derived from a microlensing planetary signal are confirmed, both with Keck measurements, presented in this paper, and independent measurements obtained with the Hubble Space Telescope in I, V and B bands, presented in a companion paper. Hence, this new measurement of $μ_{\rm{rel},\rm{helio}}$, as well as the measured brightness of the lens in H band, enabled the mass and distance of the system to be updated: a Uranus-mass planet ($m_\rm{p}=13.2\pm 1.3 M_\oplus$) orbiting a K5-type main sequence star ($M_*=0.65\pm 0.05 M_\odot$) separated by $a_\perp=3.4\pm 0.3$ AU, at the distance $D_\rm{L}=4.0\pm 0.4$ kpc from us.

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V. Batista, J. -P. Beaulieu, D. P. Bennett, A. Gould, J. -B. Marquette, A. Fukui, A. Bhattacharya. 2015-07-31. Confirmation of the OGLE-2005-BLG-169 planet signature and characteristics with lens-source proper motion detection. https://arxiv.org/abs/1507.08914

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