Hot-Jupiters and hot-Neptunes: a common origin?

Details Hot-Jupiters and hot-Neptunes: a common origin? Hot-Jupiters and hot-Neptunes: a common origin?

2005-05-03

arxiv.org/abs/astro-ph/0505054v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, accepted in A&A Letter

Scientific paper

10.1051/0004-6361:200500123

We compare evolutionary models for close-in exoplanets coupling irradiation and evaporation due respectively to the thermal and high energy flux of the parent star with observations of recently discovered new transiting planets. The models provide an overall good agreement with observations, although at the very limit of the quoted error bars of OGLE-TR-10, depending on its age. Using the same general theory, we show that the three recently detected hot-Neptune planets (GJ436, $\rho$ Cancri, $\mu$ Ara) may originate from more massive gas giants which have undergone significant evaporation. We thus suggest that hot-Neptunes and hot-Jupiters may share the same origin and evolution history. Our scenario provides testable predictions in terms of the mass-radius relationships of these hot-Neptunes.

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