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OGLE-2017-BLG-1434Lb: eighth q <1 x 10-4 mass-ratio microlens planet confirms turnover in planet mass-ratio function

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Author(s)

A. Udalski, Y-H Ryu, S. Sajadian, A. Gould, P. Mroz, R. Poleski, M. K. Szymanski, J. Skowron, Soszynski, S. Kozlowski, P. Pietrukowicz, K. Ulaczyk, M. Pawlak, K. Rybicki, P. Iwanek, M. D. Albrow, S-J Chung, C. Han, K-H Hwang, Y. K. Jung & 38 others I-G Shin, Y. Shvartzvald, J. C. Yee, W. Zang, W. Zhu, S-M Cha, D-J Kim, H-W Kim, S-L Kim, C-U Lee, D-J Lee, Y. Lee, B-G Park, R. W. Pogge, Bozza, M. Dominik, C. Helling, M. Hundertmark, U. G. Jorgensen, P. Longa-Pena, S. Lowry, M. Burgdorf, J. Campbell-White, S. Ciceri, D. Evans, R. Figuera Jaimes, Y. Fujii, L. K. Haikala, T. Henning, T. C. Hinse, L. Mancini, N. Peixinho, S. Rahvar, M. Rabus, J. Skottfelt, C. Snodgrass, J. Southworth, C. von Essen

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Abstract

We report the discovery of a cold Super-Earth planet (m(p) = 4.4 +/- 0.5 M⊙) orbiting a low-mass (M = 0.23 +/- 0.03 M) M dwarf at projected separation a⊥ = 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, DL = 0.86 ± 0.09 kpc. Indeed, it was the large lens-source relative parallax Πrel = 1.0 mas (combined with the low mass M) that gave rise to the large, and thus well-measured, "microlens parallax" πE ∝ (Πrel/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/Vmax", to seven of these eight planets to derive the mass-ratio function in this regime. We find dN / d lnq ∝ qP , 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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Original languageEnglish
Pages (from-to)1-42
JournalActa Astronomica
Volume68
Issue number1
Publication statusPublished - 2018

    Research areas

  • Gravitational lensing: micro, Planetary systems

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