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

I.A. Bond , D.P. Bennett , T. Sumi , A. Udalski , D. Suzuki , N.J. Rattenbury , V. Bozza , N. Koshimoto

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F. Abe Y. Asakura R.K. Barry A. Bhattacharya M. Donachie P. Evans A. Fukui Y. Hirao Y. Itow M.C.A. Li C.H. Ling K. Masuda Y. Matsubara Y. Muraki M. Nagakane K. Ohnishi C. Ranc To. Saito A. Sharan D.J. Sullivan P.J. Tristram T. Yamada A. Yonehara J. Skowron M.K. Szymanski R. Poleski P. Mroz I. Soszynski P. Pietrukowicz S. Kozlowski K. Ulaczyk M. Pawlak

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classification 🌌 astro-ph.EP

keywords massplanetplanetaryratiolenslowestmicrolensingogle

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

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