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1.	Udalski, A., et al. (author) OGLE-2017-BLG-1434Lb : Eighth q < 1 x 10(-4) Mass-Ratio Microlens Planet Confirms Turnover in Planet Mass-Ratio Function 2018 In: Acta Astronomica. - 0001-5237. ; 68:1, s. 1-42 Journal article (peer-reviewed)abstract We report the discovery of a cold Super-Earth planet (m(p) = 4.4 +/- 0.5 M-circle plus) orbiting a low-mass (M = 0.23 +/- 0.03 M-circle dot) M dwarf at projected separation a(perpendicular to) l = 1.18 +/- 0.10 a.u., i.e., about 1.9 times the distance the snow line. The system is quite nearby for a microlensing planet, D-L = 0.86 +/- 0.09 kpc. Indeed, it was the large lens-source relative parallax pi(rel) = 1.0 mas (combined with the low mass M) that gave rise to the large, and thus well-measured, microlens parallax pi(E) proportional to (pi(rel)/M)(1)(/2) that enabled these precise measurements. OGLE-2017-BLG-1434Lb is the eighth microlensing planet with planet-host mass ratio q < 1 x 10(-4). We apply a new planet-detection sensitivity method, which is a variant of V/V-max, to seven of these eight planets to derive the mass-ratio function in this regime. We find dN/ d lnq proportional to q(P) , with p =1.05(-0.68)(+0.78), which confirms the turnover in the mass function found by Suzuki et al. relative to the power law of opposite sign n = -0.93 +/- 0.13 at higher mass ratios q greater than or similar to 2 x 10(-4). We combine our result with that of Suzuki et al. to obtain p = 0.73(-0.34)(+0.42.)

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Type of publication: journal article (1)

Type of content: peer-reviewed (1)

Author/Editor: Kim, H. W. (1); Evans, D. (1); Kim, D. J. (1); Han, C. (1); Fujii, Y. (1); Udalski, A. (1); show more...; Henning, T. (1); Ulaczyk, K. (1); Rybicki, K (1); Lowry, S. (1); von Essen, C. (1); Southworth, J. (1); Mancini, L. (1); Ciceri, Simona (1); Mróz, P. (1); Lee, Y (1); Gould, A (1); Zhu, W (1); Pawlak, M. (1); Helling, C. (1); Yee, J. C. (1); Szymański, M. K. (1); Soszyński, I. (1); Poleski, R. (1); Kozłowski, S. (1); Pietrukowicz, P. (1); Skowron, J. (1); Rabus, M. (1); Kim, S. L. (1); Snodgrass, C. (1); Chung, S. J. (1); Pogge, R. W. (1); Jorgensen, U.G. (1); Haikala, L. K. (1); Lee, C-U (1); Bozza, V. (1); Dominik, M. (1); Hinse, T. C. (1); Hundertmark, M. (1); Rahvar, S. (1); Albrow, M. D. (1); Zang, W (1); Iwanek, P. (1); Hwang, K. -H. (1); Jung, Y. K. (1); Ryu, Y. -H. (1); Shin, I. -G. (1); Shvartzvald, Y. (1); Cha, S. -M. (1); Lee, D. -J. (1); show less...

University: Stockholm University (1)

Language: English (1)

Research subject (UKÄ/SCB): Natural sciences (1)

Year: 2018 (1)

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