Kepler discovered thousands of exoplanets and established that the majority of exoplanets below 1 au is super Earth-sized planets. However, a lot of long-period planet candidates (P>1yr) have been missed in KOI catalog. Recently, we have identified many single and double transiting events (STE/DTE) in the Kepler archival data. Surprisingly, the majority of those long-period planet candidates are Neptune-sized and sub-Saturn-sized rather than Jupiter-sized. Those results provide a challenge in planet formation theory near the snowline. Most of them lack spectroscopic information on the host stars, which is required to establish reliable estimates of the period and radius and to eliminate the false positives (FP). Here, we propose HDS observations to complete the planet catalog near and beyond the snowline through FP elimination and identification of planet size.
This document was translated from LATEX by HEVEA.