Volume 407, Number 1, August III 2003
|Page(s)||369 - 376|
|Section||Planets and planetary systems|
|Published online||17 November 2003|
Statistical properties of exoplanets
I. The period distribution: Constraints for the migration scenario
Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
Corresponding author: S. Udry, email@example.com
Accepted: 16 May 2003
Interesting emerging observational properties of the period-mass distribution of extra-solar planets are discussed. New recent detections confirm the already emphasized lack of massive planets () on short-period orbits ( days). Furthermore, we point out i) a shortage of planets in the 10–100 day period range as well as ii) a lack of light planets () on orbits with periods larger than ~100 days. The latter feature is shown not to be due to small-number statistics with Monte-Carlo simulations. These observational period-related characteristics are discussed in the context of the migration process of exoplanets. They are found to be in agreement with recent simulations of planet interactions with viscous disks. The observed valley at a few tens of days in the period distribution is interpreted as a transition region between two categories of planets that suffered different migration scenarios. The lack of light planets on longer-period orbits and the corresponding intriguing sharp limit in mass is tentatively explained by the runaway migration process recently studied by Masset & Papaloizou (2003). The observed properties also have implications for the observation strategies of the on-going surveys and of future higher-precision searches.
Key words: techniques: radial velocities / stars: planetary systems
© ESO, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.