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|Title:||Masses and radii for the three super-Earths orbiting GJ 9827, and implications for the composition of small exoplanets||Authors:||Rice, K.
Buchhave, L. A.
Collier Cameron, A.
Latham, D. W.
BONOMO, ALDO STEFANO
Martinez Fiorenzano, A. F.
Haywood, R. D.
Johnson, J. Asher
MOLINARI, Emilio Carlo
Phillips, D. F.
|Issue Date:||2019||Journal:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY||Number:||484||Issue:||3||First Page:||3731||Abstract:||Super-Earths belong to a class of planet not found in the Solar system, but which appear common in the Galaxy. Given that some super-Earths are rocky, while others retain substantial atmospheres, their study can provide clues as to the formation of both rocky and gaseous planets, and - in particular - they can help to constrain the role of photoevaporation in sculpting the exoplanet population. GJ 9827 is a system already known to host three super-Earths with orbital periods of 1.2, 3.6, and 6.2 d. Here, we use new HARPS-N radial velocity measurements, together with previously published radial velocities, to better constrain the properties of the GJ 9827 planets. Our analysis cannot place a strong constraint on the mass of GJ 9827 c, but does indicate that GJ 9827 b is rocky with a composition that is probably similar to that of the Earth, while GJ 9827 d almost certainly retains a volatile envelope. Therefore, GJ 9827 hosts planets on either side of the radius gap that appears to divide super-Earths into pre-dominantly rocky ones that have radii below ∼1.5R<SUB>⊕</SUB>, and ones that still retain a substantial atmosphere and/or volatile components, and have radii above ∼2R<SUB>⊕</SUB>. That the less heavily irradiated of the three planets still retains an atmosphere, may indicate that photoevaporation has played a key role in the evolution of the planets in this system.||URI:||http://hdl.handle.net/20.500.12386/29145||URL:||http://arxiv.org/abs/1812.07302v3
|Appears in Collections:||1.01 Articoli in rivista|
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