On the Mass-Period Correlation of the Extrasolar Planets

Details On the Mass-Period Correlation of the Extrasolar Planets On the Mass-Period Correlation of the Extrasolar Planets

2002-02-22

arxiv.org/abs/astro-ph/0202415v1

Astrophys.J.568:L113-L116,2002

Astronomy and Astrophysics

Astrophysics

13 pages, 4 figures, accepted for publication in The Astrophysical Journal Letters

Scientific paper

10.1086/340373

We report on a possible correlation between the masses and periods of the extrasolar planets, manifested as a paucity of massive planets with short orbital periods. Monte-Carlo simulations show the effect is significant, and is not solely due to an observational selection effect. We also show the effect is stronger than the one already implied by published models that assumed independent power-law distributions for the masses and periods of the extrasolar planets. Planets found in binary stellar systems may have an opposite correlation. The difference is highly significant despite the small number of planets in binary systems. We discuss the paucity of short-period massive planets in terms of some theories for the close-in giant planets. Almost all models can account for the deficit of massive planets with short periods, in particular the model that assumes migration driven by a planet-disk interaction, if the planet masses do not scale with their disk masses.

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