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

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arxiv 1802.02582 v1 pith:7JSJKKLP submitted 2018-02-07 astro-ph.EP

A. Udalski , Y.-H. Ryu , S. Sajadian , A. Gould , P. Mróz , R. Poleski , M. K. Szymański , J. Skowron
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I. Soszyński S. Koz{l}owski P. Pietrukowicz K. Ulaczyk M. Pawlak K. Rybicki P. Iwanek M. D. Albrow S.-J. Chung C. Han K.-H. Hwang Y. K. Jung 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 V. Bozza M. Dominik C. Helling M. Hundertmark U.G. J{o}rgensen P. Longa-Peña S. Lowry M. Burgdorf J. Campbell-White S. Ciceri D. Evans R. Figuera Jaimes Y.I. 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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keywords planetmassfunctionmass-ratioconfirmseighthlargemicrolens
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We report the discovery of a cold Super-Earth planet (m_p=4.4 +/- 0.5 M_Earth) orbiting a low-mass (M=0.23 +/- 0.03 M_Sun) M dwarf at projected separation a_perp = 1.18 +/- 0.10 AU, i.e., about 1.9 times the snow line. The system is quite nearby for a microlensing planet, D_Lens = 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" that enabled these precise measurements. OGLE-2017-BLG-1434Lb is the eighth microlensing planet with planet-host mass ratio q < 1 * 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(ln q) ~ q^p, with p = 1.05 (+0.78,-0.68), 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 >~ 2 * 10^-4. We combine our result with that of Suzuki et al. to obtain p = 0.73 (+0.42,-0.34).

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  1. Systematic KMTNet Planetary Anomaly Search. XII. Complete Sample of 2017 Subprime Field Planets

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    The 2017 KMTNet subprime-field search adds four unambiguous planets, completing a homogenous 112-planet microlensing sample that confirms the 'sub-Saturn desert' in planet-host mass ratios.

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