Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.0801b&link_type=abstract
American Astronomical Society, ESS meeting #2, #8.01
Astronomy and Astrophysics
Astronomy
Scientific paper
We report new results for simulations of planets growing from a sea of planetesimals within a protoplanetary disk. We track the viscous evolution of the disk, coagulation and fragmentation of planetesimals, grain removal by gas drag and radiation forces, gravitational dynamics of protoplanets, and accretion of gas by icy or rocky cores. Key physical parameters for our code include the initial mass of the disk (Mdisk), the gas viscosity (α), the disk's photoevaporation rate (φ), and the fraction of accretion energy that is lost to radiation by accreting massive planets (η). Our new results demonstrate how each of these parameters impact the numbers, masses, and orbital parameters of newly-formed planetary systems. In our published results, we show how high Mdisk and low α promote the formation of more massive planets. In this talk, we illustrate how high photoevaporation rates favor formation of Neptunes over Jupiters, in line with observations of exoplanetary systems.
Bromley Benjamin
Kenyon Scott. J.
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