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

Udalski, A.; Ryu, Y. -H.; Sajadian, S.; Gould, A.; Mróz, P.; Poleski, R.; Szymański, M. K.; Skowron, J.; Soszyński, I.; Kozłowski, 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.; Jørgensen, U. G.; Longa-Peña, P.; Lowry, S.; Burgdorf, M.; Campbell-White, J.; Ciceri, S.; Evans, D.; Figuera Jaimes, R.; Fujii, Y. I.; 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.

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

MPS-Authors

Udalski, A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ryu, Y. -H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sajadian, S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gould, A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mróz, P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Poleski, R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Szymański, M. K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Skowron, J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Soszyński, I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kozłowski, S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pietrukowicz, P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ulaczyk, K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pawlak, M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rybicki, K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Iwanek, P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Albrow, M. D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chung, S. -J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Han, C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hwang, K. -H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jung, Y., K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shin, I. -G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shvartzvald, Y.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yee, J. C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zang, W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zhu, W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cha, S. -M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim, D. -J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim, H. -W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim, S. -L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee, C. -U.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee, D. -J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee, Y.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Park, B. -G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pogge, R. W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bozza, V.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Dominik, M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Helling, C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hundertmark, M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jørgensen, U. G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Longa-Peña, P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lowry, S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Burgdorf, M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Campbell-White, J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ciceri, S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Evans, D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Figuera Jaimes, R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fujii, Y. I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Haikala, L. K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Henning, T.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hinse, T. C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mancini, L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Peixinho, N.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rahvar, S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rabus, M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Skottfelt, J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Snodgrass, C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Southworth, J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

von Essen, C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018AcA....68....1U
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Citation

Udalski, A., Ryu, Y.-.-H., Sajadian, S., Gould, A., Mróz, P., Poleski, R., et al. (2018). OGLE-2017-BLG-1434Lb: Eighth q<1×10^-4 Mass-Ratio Microlens Planet Confirms Turnover in Planet Mass-Ratio Function. Acta Astronomica, 68, 1-42.

Cite as: https://hdl.handle.net/21.11116/0000-0005-CA90-4

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_☉) 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, D_L= 0.86±0.09 kpc. Indeed, it was the large lens-source relative parallax π_rel=1.0 mas (combined with the low mass M) that gave rise to the large, and thus well- measured, "microlens parallax" π_E∝(π_rel/M)^1/2 that enabled these precise measurements. OGLE-2017-BLG-1434Lb is the eighth microlensing planet with planet-host mass ratio q<1×10^-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 ∝ 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.