2018
DOI: 10.1093/mnrasl/sly100
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Migration-driven diversity of super-Earth compositions

Abstract: A leading model for the origin of super-Earths proposes that planetary embryos migrate inward and pile up on close-in orbits. As large embryos are thought to preferentially form beyond the snowline, this naively predicts that most super-Earths should be very water-rich. Here we show that the shortest period planets formed in the migration model are often purely rocky. The inward migration of icy embryos through the terrestrial zone accelerates the growth of rocky planets via resonant shepherding. We illustrate… Show more

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Cited by 89 publications
(91 citation statements)
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References 63 publications
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“…20and its error is estimated to be ±60% of the flare energy following the recommendations of Shibayama et al (2013). survived atmospheric erosion) as supported by some planet formation scenarios (Coleman et al 2019;Schoonenberg et al 2019;Izidoro et al 2019;Bitsch et al 2019;Raymond et al 2018) and density measurements (Grimm et al 2018). This stems from the fact that TRAPPIST-1b and c have incident fluxes beyond the runaway greenhouse limit for which water has been shown to be unstable in condensed form and should rather form a thick H2Odominated atmosphere (Turbet et al 2019).…”
Section: Occultationsmentioning
confidence: 90%
“…20and its error is estimated to be ±60% of the flare energy following the recommendations of Shibayama et al (2013). survived atmospheric erosion) as supported by some planet formation scenarios (Coleman et al 2019;Schoonenberg et al 2019;Izidoro et al 2019;Bitsch et al 2019;Raymond et al 2018) and density measurements (Grimm et al 2018). This stems from the fact that TRAPPIST-1b and c have incident fluxes beyond the runaway greenhouse limit for which water has been shown to be unstable in condensed form and should rather form a thick H2Odominated atmosphere (Turbet et al 2019).…”
Section: Occultationsmentioning
confidence: 90%
“…Inamdar & Schlichting 2016), or have ice-rich cores, or those with variable core compositions (e.g. Raymond et al 2018). Finally, if the measured masses are typically below those required to be consistent with the photoevaporation model, then the model can be ruled out as the origin of the observed radius gap.…”
Section: Assumptionsmentioning
confidence: 99%
“…Tanaka et al 2002). Hence, a pure dry core composition for most short-period exoplanets is not really expected from formation models (Raymond et al 2018;Bitsch et al 2019;Brügger et al 2020). A possible way out is to invoke migration traps due to the existence of dead zones in the disc (Alessi et al 2020).…”
Section: Introductionmentioning
confidence: 97%