(Proposal ID) S17A-106

(PI) Hirano, Teruyuki

(Proposal Title)
ESPRINT IV: A New Search for Transiting Planets Unveiled by K2

(Abstract)
We propose to observe the systems with planet candidates unveiled by K2, the 
second mission of the {Kepler} spacecraft. We developed our own tool to 
analyze the K2 pixel data, having detected dozens of planet candidates in each 
of the published fields. Our collaboration, named ESPRINT, has advantages over 
other similar K2 follow-up teams in that (1) we have experience and facilities 
for validating planets around cool stars, and (2) we have plentiful resources 
for precise RV measurements. Fully exploiting those advantages, we here focus 
on the validation of small planets around M dwarfs, and mass measurements 
(confirmation) of close-in planet candidates around relatively bright stars. 
We propose to validate up to seven most interesting planetary systems around M 
dwarfs, selected from K2 fields 6, 7, 10, and/or 11, by combining 
reconnaissance spectroscopy with HDS and high contrast (AO) imaging with IRCS. 
Planets around cool stars validated in our campaign would become ideal targets 
for further characterizations (e.g., mass measurements) in the upcoming 
semesters using high dispersion spectroscopy in the near infrared (i.e., 
Subaru/IRD). We also plan to measure radial velocities (RVs) for a few 
relatively bright solar-type stars hosting close-in planet candidates.