(Proposal ID) S15A-125

(PI) Sato, Bunei

(Proposal Title)
 Confirmation of  Kepler Planet Candidates around Giants

(Abstract)
Planets around giants and subgiants have been intensively surveyed over the 
decade by precise radial velocity (RV) measurements, mainly from the viewpoint 
of planet searches around intermediate-mass (1.5--5M_sun) stars. The planets 
show remarkable properties in their masses and orbital parameters. 
Unfortunately, however, it is quite difficult to detect transiting ones around 
such evolved stars because of the large sizes of the host stars. Therefore, 
our understanding of properties of planets around intermediate-mass stars are 
still far behind from those around solar-like stars. In S13B and S14A, we made 
RV follow-up observations with HDS for the transiting planet candidates around 
giants found by Kepler space telescope. We confirmed two transiting planets, 
and also detected significant RV variations for the other two stars. Here we 
propose to continue RV monitoring for them with HDS in order to constrain 
their orbital parameters further especially for the latter two stars whose RV 
variations are apparently not in phase to transit curves.