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A giant impact as the likely origin of different twins in the Kepler-107 exoplanet system | | Aldo S. Bonomo
; Li Zeng
; Mario Damasso
; Zoë M. Leinhardt
; Anders B. Justesen
; Eric Lopez
; Mikkel N. Lund
; Luca Malavolta
; Victor Silva Aguirre
; Lars A. Buchhave
; Enrico Corsaro
; Thomas Denman
; Mercedes Lopez-Morales
; Sean M. Mills
; Annelies Mortier
; Ken Rice
; Alessandro Sozzetti
; Andrew Vanderburg
; Laura Affer
; Torben Arentoft
; Mansour Benbakoura
; François Bouchy
; Jørgen Christensen-Dalsgaard
; Andrew Collier Cameron
; Rosario Cosentino
; Courtney D. Dressing
; Xavier Dumusque
; Pedro Figueira
; Aldo F. M. Fiorenzano
; Rafael A. García
; Rasmus Handberg
; Avet Harutyunyan
; John A. Johnson
; Hans Kjeldsen
; David W. Latham
; Christophe Lovis
; Mia S. Lundkvist
; Savita Mathur
; Michel Mayor
; Giusi Micela
; Emilio Molinari
; Fatemeh Motalebi
; Valerio Nascimbeni
; Chantanelle Nava
; Francesco Pepe
; David F. Phillips
; Giampaolo Piotto
; Ennio Poretti
; Dimitar Sasselov
; Damien Ségransan
; Stéphane Udry
; Chris Watson
; | | Date: |
4 Feb 2019 | | Abstract: | Measures of exoplanet bulk densities indicate that small exoplanets with
radius less than 3 Earth radii ($R_oplus$) range from low-density sub-Neptunes
containing volatile elements to higher density rocky planets with Earth-like or
iron-rich (Mercury-like) compositions. Such astonishing diversity in observed
small exoplanet compositions may be the product of different initial conditions
of the planet-formation process and/or different evolutionary paths that
altered the planetary properties after formation. Planet evolution may be
especially affected by either photoevaporative mass loss induced by high
stellar X-ray and extreme ultraviolet (XUV) flux or giant impacts. Although
there is some evidence for the former, there are no unambiguous findings so far
about the occurrence of giant impacts in an exoplanet system. Here, we
characterize the two innermost planets of the compact and near-resonant system
Kepler-107. We show that they have nearly identical radii (about
$1.5-1.6~R_oplus$), but the outer planet Kepler-107c is more than twice as
dense (about $12.6~
m g,cm^{-3}$) as the innermost Kepler-107b (about
$5.3~
m g,cm^{-3}$). In consequence, Kepler-107c must have a larger iron core
fraction than Kepler-107b. This imbalance cannot be explained by the stellar
XUV irradiation, which would conversely make the more-irradiated and
less-massive planet Kepler-107b denser than Kepler-107c. Instead, the
dissimilar densities are consistent with a giant impact event on Kepler-107c
that would have stripped off part of its silicate mantle. This hypothesis is
supported by theoretical predictions from collisional mantle stripping, which
match the mass and radius of Kepler-107c. | | Source: | arXiv, 1902.1316 | | Services: | Forum | Review | PDF | Favorites | |
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