KMT-2016-BLG-1836Lb: A Super-Jovian Planet from a High-cadence Microlensing Field
Résumé
We report the discovery of a super-Jovian planet in the microlensing event KMT-2016-BLG-1836, which was found by the Korea Microlensing Telescope Network (KMTNet) high-cadence observations ( ${\rm{\Gamma }}\sim 4\,{\mathrm{hr}}^{-1}$ ). The planet-host mass ratio q ∼ 0.004. A Bayesian analysis indicates that the planetary system is composed of a super-Jovian ${M}_{\mathrm{planet}}={2.2}_{-1.1}^{+1.9}{M}_{{\rm{J}}}$ planet orbiting an M or K dwarf, ${M}_{\mathrm{host}}={0.49}_{-0.25}^{+0.38}{M}_{\odot }$ , at a distance of ${D}_{{\rm{L}}}={7.1}_{-2.4}^{+0.8}$ kpc. The projected planet-host separation is ${3.5}_{-0.9}^{+1.1}$ au, implying that the planet is located beyond the snow line of the host star. Future high-resolution images can potentially strongly constrain the lens brightness and thus the mass and distance of the planetary system. Without considering detailed detection efficiency, selection, or publication biases, we find a potential mass-ratio desert at -3.7 ≲ log q ≲ -3.0 for the 31 published KMTNet planets.