THE GEMINI PLANET IMAGER (GPI) IS AN ADVANCED GROUND-BASED CORONAGRAPHIC INSTRUMENT DEPLOYED ON THE GEMINI SOUTH TELESCOPE. GPI IS CAPABLE OF DETECTING YOUNG (<300 MYR) GIANT (>1 MJ) PLANETS THROUGH NEAR-INFRARED EMISSION SPECTROSCOPICALLY CHARACTERIZING THEIR ATMOSPHERES AND CONSTRAINING THEIR ORBITAL PROPERTIES. IN LATE 2014 WE BEGAN USING GPI FOR A LARGE-SCALE SEARCH FOR SUCH PLANETS THE GEMINI PLANET IMAGER EXOPLANET SURVEY (GPIES). FROM 2015-2018 GPIES WILL OBSERVE 600 NEARBY YOUNG STARS. TO DATE THE SURVEY HAS DISCOVERED THE COOL METHANE-DOMINATED PLANET 51 ERIDANI B CHARACTERIZED PREVIOUSLY-KNOWN PLANETS MAPPED CIRCUMSTELLAR DEBRIS DISKS AND DETECTED SEVERAL BROWN DWARF COMPANIONS AS WELL AS DETECTING A LARGE NUMBER OF CANDIDATE EXOPLANETS. DETECTED COMPANIONS TENTATIVELY SHOW EVIDENCE OF A PLANETARY SEMI-MAJOR-AXIS DISTRIBUTION THAT IS RISING AS WE APPROACH THE ICE LINE. WE PROPOSE TO COMPLETE THE GPIES CAMPAIGN OBSERVATIONS OF NEW STARS AND FOLLOW UP CANDIDATE COMPANIONS TO DETERMINE THEIR TRUE NATURE. WE WILL DEVELOP BAYSEIAN ALGORITHMS TO PROPERLY CHARACTERIZE THE COMPLETENESS AND SENSITIVITY OF THE SURVEY. USING THESE WE WILL ASSESS THE STATISTICAL PROPERTIES OF THE POPULATION OF WIDE ORBIT (>5 AU) GIANT PLANETS. IN COMPARISON WITH DOPPLER-DETECTED PLANET POPULATIONS WE WILL DETERMINE IF WE HAVE INDEED REACHED THE OUTER EDGE OF TRADITIONAL PLANET FORMATION OR IF WIDE-ORBIT GIANT PLANETS ARE FORMED BY A DIFFERENT PROCESS THAN THEIR CLOSE-IN COUNTERPARTS. WE WILL ALSO ANALYZE THE STATISTICAL ASSOCIATION OF GIANT PLANETS WITH STELLAR SPECTRAL TYPE AND WITH THE PRESENCE OF A CIRCUMSTELLAR DEBRIS DISK.
$762,273FY2020National Aeronautics and Space AdministrationNASA
The Leland Stanford Junior University