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 ∼2.5hours. The measured ratio of the planet mass to its host star is q=4.2±0.7×10−5. We further estimate that the lens system is likely to comprise a cold ∼3 Earth mass planet in a ∼2 AU wide orbit around a 0.2 Solar mass star at an overall distance of 7.1 kpc.
@article{arxiv.1703.08639,
title = {The Lowest Mass Ratio Planetary Microlens: OGLE 2016-BLG-1195Lb},
author = {I. A. Bond and D. P. Bennett and T. Sumi and A. Udalski and D. Suzuki and N. J. Rattenbury and V. Bozza and N. Koshimoto and F. Abe and Y. Asakura and R. K. Barry and A. Bhattacharya and M. Donachie and P. Evans and A. Fukui and Y. Hirao and Y. Itow and M. C. A. Li and C. H. Ling and K. Masuda and Y. Matsubara and Y. Muraki and M. Nagakane and K. Ohnishi and C. Ranc and To. Saito and A. Sharan and D. J. Sullivan and P. J. Tristram and T. Yamada and T. Yamada and A. Yonehara and J. Skowron and M. K. Szymanski and R. Poleski and P. Mroz and I. Soszynski and P. Pietrukowicz and S. Kozlowski and K. Ulaczyk and M. Pawlak},
journal= {arXiv preprint arXiv:1703.08639},
year = {2017}
}
Comments
8 pages, 5 figures, accepted for publication in MNRAS