A Super-Jupiter Microlens Planet Characterized by High-Cadence KMTNet Microlensing Survey Observations of OGLE-2015-BLG-0954

I. -G. Shin; Y. -H. Ryu; A. Udalski; M. Albrow; S. -M. Cha; J. -Y. Choi; S. -J. Chung; C. Han; K. -H. Hwang; Y. K. Jung; D. -J. Kim; S. -L. Kim; C. -U. Lee; Y. Lee; B. -G. Park; H. Park; R. W. Pogge; J. C. Yee; P. Pietrukowicz; P. Mróz; S. Kozłowski; R. Poleski; J. Skowron; I. Soszyński; M. K. Szymański; K. Ulaczyk; Ł. Wyrzykowski; M. Pawlak; A. Gould

doi:10.5303/jkas.2016.49.3.073

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arXiv · 1603.00020

A Super-Jupiter Microlens Planet Characterized by High-Cadence KMTNet Microlensing Survey Observations of OGLE-2015-BLG-0954

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Abstract

We report the characterization of a massive (m_p=3.9 +- 1.4 M_jup) microlensing planet (OGLE-2015-BLG-0954Lb) orbiting an M dwarf host (M=0.33 +- 0.12 M_sun) at a distance toward the Galactic bulge of 0.6 (+0.4,-0.2) kpc, which is extremely nearby by microlensing standards. The planet-host projected separation is a_perp ~ 1.2 AU. The characterization was made possible by the wide-field (4 sq. deg.) high cadence (Gamma = 6/hr) monitoring of the Korea Microlensing Telescope Network (KMTNet), which had two of its three telescopes in commissioning operations at the time of the planetary anomaly. The source crossing time t_* = 16 min is among the shortest ever published. The high-cadence, wide-field observations that are the hallmark of KMTNet are the only way to routinely capture such short crossings. High-cadence resolution of short caustic crossings will preferentially lead to mass and distance measurements for the lens. This is because the short crossing time typically implies a nearby lens, which enables the measurement of additional effects (bright lens and/or microlens parallax). When combined with the measured crossing time, these effects can yield planet/host masses and distance.

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I. -G. Shin, Y. -H. Ryu, A. Udalski, M. Albrow, S. -M. Cha, J. -Y. Choi, S. -J. Chung, C. Han, K. -H. Hwang, Y. K. Jung, D. -J. Kim, S. -L. Kim, C. -U. Lee, Y. Lee, B. -G. Park, H. Park, R. W. Pogge, J. C. Yee, P. Pietrukowicz, P. Mróz, S. Kozłowski, R. Poleski, J. Skowron, I. Soszyński, M. K. Szymański, K. Ulaczyk, Ł. Wyrzykowski, M. Pawlak, A. Gould. 2016-02-29. A Super-Jupiter Microlens Planet Characterized by High-Cadence KMTNet Microlensing Survey Observations of OGLE-2015-BLG-0954. https://doi.org/10.5303/jkas.2016.49.3.073

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