We propose to use Gemini-N MAROON-X in the 24A semester to monitor radial velocities (RVs) of a mid-M dwarf, which has evidence to host an inner eccentric transiting planet and an outer long-period eccentric giant planet based on 3 years of RV monitoring using Subaru IRD and Gemini-N MAROON-X. Continued MAROON-X RV monitoring in the S24A semester is critically important and will enable us to determine the masses and the eccentricities of the 2 planets accurately and precisely. We note that the host star has a common proper motion M7.5 companion at ∼550 au in sky-projection. With the eccentric orbits of the 2 planets and the existence of the common proper motion companion, this planetary system is very interesting for investigating planet formation and migration models. We also note that considering the apastron distance of the outer planet and the brightness of the host star, the outer planet will become an excellent target for atmospheric characterization with future direct imaging observations with TMT. Also, the astrometric signal of the outer planet is expected to be ∼20 µas, which may be detectable in the future GAIA data release. RV characterization of the outer planet is thus important and will lead to further characterizations of this planetary system.
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