Nadine Nettelmann (1,2), Jonathan Fortney (1),
Ulrike Kramm (2), Ronald Redmer (2)
(1): University of California, Santa Cruz, CA 95064
(2): Universitaet Rostock, 18051 Rostock, Germany
The first transiting Neptune-mass planet GJ436b (Mp=23 ME) and the
'planet of the decade' GJ1214b (Mp=6.5 ME) have slightly larger radii
than theoretical cold ice planets. Warm water however is an appealing
assumption to explain the observed mass, radius, and effective
temperature of these planets.
We present interior structure models for these planets ranging from
water to rocky planets with H-He atmospheres. These models include a new
state-of-the-art first principles EOS for water. In case of GJ436b, we
consider a wide range of atmospheric temperatures and investigate
constraints from the potentially observable k2 tidal Love number.
In case of GJ1214b, we couple the interior models to non-grey atmosphere
models and investigate both the structure and thermal evolution of the
planet over the last several Gyr.