All You Want Is Here
Thousands of extrasolar planets have been found with with a wide range of masses and radii yet only small fraction of these planets have had both their mass and radius measured. Having both the mass and radius gives insight towards the bulk-composition of a planet.
Dr. Rowe will present an analysis of the 3-planet transiting Kepler-138 system where his group was able to measure the mass and radius of a planet smaller than the Earth. This was accomplished by using the depth of the transit to determine the radius and transiting-timing-variations to determine the mass.