Formation and composition of planets around very low mass stars

Alibert, Yann; Benz, Willy (2017). Formation and composition of planets around very low mass stars. Astronomy and astrophysics, 598(L5), L5. EDP Sciences 10.1051/0004-6361/201629671

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Context. The recent detection of planets around very low mass stars raises the question of the formation, composition, and potential habitability of these objects. Aims. We use planetary system formation models to infer the properties, in particular their radius distribution and water content, of planets that may form around stars ten times less massive than the Sun. Methods. Our planetary system formation and composition models take into account the structure and evolution of the protoplanetary disk, the planetary mass growth by accretion of solids and gas, as well as planet-planet, planet-star, and planet-disk interactions. Results. We show that planets can form at small orbital period in orbit about low-mass stars. We show that the radius of the planets is peaked at about 1 R⊕ and that they are, in general, volatile rich especially if proto-planetary disks orbiting this type of stars are long lived. Conclusions. Close-in planets orbiting low-mass stars similar in terms of mass and radius to those recently detected can be formed within the framework of the core-accretion paradigm as modeled here. The properties of protoplanetary disks, and their correlation with the stellar type, are key to understand their composition.

Item Type:

Journal Article (Further Contribution)


10 Strategic Research Centers > Center for Space and Habitability (CSH)
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Alibert, Yann and Benz, Willy


500 Science > 520 Astronomy
500 Science > 530 Physics




EDP Sciences




Janine Jungo

Date Deposited:

28 Jul 2017 16:17

Last Modified:

06 Aug 2017 02:14

Publisher DOI:





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