摘要：We present the discovery and characterization of a new transiting planet from Campaign 17 of theKeplerextended missionK2. The planet K2-292 b is a warm sub-Neptune on a 17 day orbit around a bright (V= 9.9 mag) solar-like G3 V star with a mass and radius ofM⋆= 1.00 ± 0.03M⊙andR⋆= 1.09 ± 0.03R⊙, respectively. We modeled simultaneously theK2photometry and CARMENES spectroscopic data and derived a radius ofRp=2.63−0.10+0.12R⊕and mass ofMp=24.5−4.4+4.4M⊕, yielding a mean density of ρp=7.4−1.5+1.6g cm−3, which makes it one of the densest sub-Neptunian planets known to date. We also detected a linear trend in the radial velocities of K2-292 (γ˙RV= −0.40−0.07+0.07m s−1d−1) that suggests a long-period companion with a minimum mass on the order of 33M⊕. If confirmed, it would support a formation scenario of K2-292 b by migration caused by Kozai-Lidov oscillations.
关键词：Key wordsenplanetary systemstechniques: photometrictechniques: radial velocitiestechniques: high angular resolutionstars: individual: HD 119130stars: individual: K2-292
