OGLE-2017-BLG-1434Lb: Eighth q < 1 x 10(-4) Mass-Ratio Microlens Planet Confirms Turnover in Planet Mass-Ratio Function

OGLE-2017-BLG-1434Lb : Eighth q < 1 x 10(-4) Mass-Ratio Microlens Planet Confirms Turnover in Planet Mass-Ratio Function

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.)

Ryu, Y-H (author)
Sajadian, S. (author)
Gould, A. (author)
Mroz, P. (author)
Poleski, R. (author)
Szymanski, M. K. (author)
Skowron, J. (author)
Soszynski, I (author)
Kozlowski, S. (author)
Pietrukowicz, P. (author)
Ulaczyk, K. (author)
Pawlak, M. (author)
Rybicki, K. (author)
Iwanek, P. (author)
Albrow, M. D. (author)
Chung, S-J (author)
Han, C. (author)
Hwang, K-H (author)
Jung, Y. K. (author)
Shin, I-G (author)
Shvartzvald, Y. (author)
Yee, J. C. (author)
Zang, W. (author)
Zhu, W. (author)
Cha, S-M (author)
Kim, D-J (author)
Kim, H-W (author)
Kim, S-L (author)
Lee, C-U (author)
Lee, D-J (author)
Lee, Y. (author)
Park, B-G (author)
Pogge, R. W. (author)
Bozza, V (author)
Dominik, M. (author)
Helling, C. (author)
Hundertmark, M. (author)
Jorgensen, U. G. (author)
Longa-Pena, P. (author)
Lowry, S. (author)
Burgdorf, M. (author)
Campbell-White, J. (author)
Ciceri, SimonaStockholms universitet,Institutionen för astronomi(Swepub:su)scice (author)
Evans, D. (author)
Figuera Jaimes, R. (author)
Fujii, Y. (author)
Haikala, L. K. (author)
Henning, T. (author)
Hinse, T. C. (author)
Mancini, L. (author)
Peixinho, N. (author)
Rahvar, S. (author)
Rabus, M. (author)
Skottfelt, J. (author)
Snodgrass, C. (author)
Southworth, J. (author)
von Essen, C. (author)
Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

By the author/editor: Udalski, A.; Ryu, Y-H; Sajadian, S.; Gould, A.; Mroz, P.; Poleski, R.; show more...; Szymanski, M. K.; Skowron, J.; Soszynski, I; Kozlowski, S.; Pietrukowicz, P.; Ulaczyk, K.; Pawlak, M.; Rybicki, K.; Iwanek, P.; Albrow, M. D.; Chung, S-J; Han, C.; Hwang, K-H; Jung, Y. K.; Shin, I-G; Shvartzvald, Y.; Yee, J. C.; Zang, W.; Zhu, W.; Cha, S-M; Kim, D-J; Kim, H-W; Kim, S-L; Lee, C-U; Lee, D-J; Lee, Y.; Park, B-G; Pogge, R. W.; Bozza, V; Dominik, M.; Helling, C.; Hundertmark, M.; Jorgensen, U. G.; Longa-Pena, P.; Lowry, S.; Burgdorf, M.; Campbell-White, ...; Ciceri, Simona; Evans, D.; Figuera Jaimes, ...; Fujii, Y.; Haikala, L. K.; Henning, T.; Hinse, T. C.; Mancini, L.; Peixinho, N.; Rahvar, S.; Rabus, M.; Skottfelt, J.; Snodgrass, C.; Southworth, J.; von Essen, C.; show less...

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