The Lowest Mass Ratio Planetary Microlens: OGLE 2016-BLG-1195Lb [EPA]

http://arxiv.org/abs/1703.08639


We report discovery of the lowest mass ratio exoplanet to be found by the microlensing method in the light curve of the event OGLE~2016–BLG–1195. This planet revealed itself as a small deviation from a microlensing single lens profile from an examination of the survey data soon after the planetary signal. The duration of the planetary signal is $\sim 2.5\,$hours. The measured ratio of the planet mass to its host star is $q = 4.2\pm 0.7 \times10^{-5}$. We further estimate that the lens system is likely to comprise a cold $\sim$3 Earth mass planet in a $\sim\,$2 AU wide orbit around a 0.2 Solar mass star at an overall distance of 7.1 kpc.

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I. Bond, D. Bennett, T. Sumi, et. al.
Tue, 28 Mar 17
5/68

Comments: 7 pages, 4 figures, submitted to MNRAS