We propose an extension of the Subaru IRD TESS Intensive Follow-up Project II to further follow-up TESS-discovered candidate transiting planets (TESS Of Interests, TOIs) with Subaru IRD. Our prime goal of this project is to gain knowledge which can place crucial constraints on the formation and evolution of planets and planetary systems around mid-late M dwarfs. For the purpose, we have selected 13 TOIs in 3 categories orbiting around relatively faint (10.6 <∼ J <∼ 12.6) mid-late M dwarfs (Teff <∼ 3,500K). Subaru IRD is especially competitive and unique in observing such faint mid-late M dwarfs. The selected TOIs are (1) candidate giant planets, (2) eccentric sub-Neptunes, and (3) candidate multiple planetary systems, identified from the previous Subaru IRD radial velocity measurements and from supporting multi-color transit photometry with the MuSCAT series. The proposed observations will provide important insight on the nature of planets around mid-late M dwarfs and bring crucial feedback for planet formation theories.
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