David R. Ciardi, Daniel C. Fabrycky, Eric B. Ford, T. N. Gautier III, Steve B. Howell, Jack J. Lissauer, Darin Ragozzine, Jason F. Rowe
We present a study of the relative sizes of planets within the multiple candidate systems discovered with the $Kepler$ mission. We have compared the size of each planet to the size of every other planet within a given planetary system after correcting the sample for detection and geometric biases. We find that for planet-pairs for which one or both objects is approximately Neptune-sized or larger, the larger planet is most often the planet with the longer period. No such size--location correlation is seen for pairs of planets when both planets are smaller than Neptune. Specifically, if at least one planet in a planet-pair has a radius of $\gtrsim 3R_\oplus$, $68\pm 6%$ of the planet pairs have the inner planet smaller than the outer planet, while no preferred sequential ordering of the planets is observed if both planets in a pair are smaller than $\lesssim3 R_\oplus$.
View original:
http://arxiv.org/abs/1212.1859
No comments:
Post a Comment