Exoplanets & Exomoons

Migrating Jupiter Up To The Habitable Zone: Earth-like Planet Formation and Water Delivery

By Keith Cowing
Press Release
August 2, 2017
Filed under
Migrating Jupiter Up To The Habitable Zone: Earth-like Planet Formation and Water Delivery

Several observational works have shown the existence of Jupiter-mass planets covering a wide range of semi-major axes around Sun-like stars.

We aim to analyse the planetary formation processes around Sun-like stars that host a Jupiter-mass planet at intermediate distances ranging from ∼1 au to 2 au. Our study focusses on the formation and evolution of terrestrial-like planets and water delivery in the habitable zone (HZ) of the system. Our goal is also to analyse the long-term dynamical stability of the resulting systems. A semi-analytic model was used to define the properties of a protoplanetary disk that produces a Jupiter-mass planet around the snow line, which is located at ∼2.7 au for a solar-mass star.

Then, it was used to describe the evolution of embryos and planetesimals during the gaseous phase up to the formation of the Jupiter-mass planet, and we used the results as the initial conditions to carry out N-body simulations of planetary accretion. Our simulations produce three different classes of planets in the HZ: ‘water worlds’, with masses between 2.75 M⊕ and 3.57 M⊕ and water contents of 58% and 75% by mass, terrestrial-like planets, with masses ranging from 0.58 M⊕ to 3.8 M⊕ and water contents less than 1.2% by mass, and ‘dry worlds’, simulations of which show no water. A relevant result suggests the efficient coexistence in the HZ of a Jupiter-mass planet and a terrestrial-like planet with a percentage of water by mass comparable to the Earth.

Moreover, our study indicates that these planetary systems are dynamically stable for at least 1 Gyr. Systems with a Jupiter-mass planet located at 1.5 au – 2 au around solar-type stars are of astrobiological interest. These systems are likely to harbour terrestrial-like planets in the HZ with a wide diversity of water contents.

L. A. Darriba, G. C. de Elía, O. M. Guilera, A. Brunini
(Submitted on 1 Aug 2017)

Comments: 15 pages, 10 figures
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
Cite as: arXiv:1708.00290 [astro-ph.EP] (or arXiv:1708.00290v1 [astro-ph.EP] for this version)
Submission history
From: Luciano Darriba
[v1] Tue, 1 Aug 2017 12:49:03 GMT (1274kb)

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