Project EOS: THE MASSES AND METALLICITIES OF COOL GIANT EXOPLANETS
The union of the transit and radial velocity (RV) techniques, each of which measures a key exoplanet observable, has strongly guided the early development of exoplanet science.
However, the short-period selection bias of the transit method has left a dearth of well characterized exoplanets at wider separations, limiting tests of planetary formation theories and contributing to the knowledge gap separating exoplanet and Solar System science. I will discuss results from the ongoing Giant Outer Transiting Exoplanet Mass (GOT ‘EM) survey, which combines transits and RVs but confronts the transit method’s selection bias by focusing on planets with orbital periods between 100 and 1,000 days. The Kepler and TESS missions have discovered a modest sample of these cool giant planets, most with temperatures well below 500 K, but their characterization is still an area of emerging research owing to their lengthy and logistically challenging follow-up process. I will describe our 3+ year effort to measure over a dozen planet masses and orbital eccentricities with Keck-HIRES as well as our methods to infer their bulk heavy element content. Individually, each giant exoplanet is a valuable stepping stone in the underexplored parameter space between hot Jupiters and the Solar System gas giants. Cumulatively, they offer tentative evidence that the heavy element content within a giant planet depends on its current orbital properties. I will place the results of the GOT ‘EM survey in context with recent Solar System results from Cassini and Juno and highlight exciting opportunities for atmospheric characterization in the near future.
DECEMBER 6 , 2021 | 12 PM NOON | ZOOM
PAUL DALBA, NSF FELLOW, UC SANTA CRUZ, UC RIVERSIDE
- Audience: Adult
- Genre: Space & Astronomy
- Type: Online, Presentation