Planet Formation Signposts: Observability of Circumplanetary Disks Via Gas KinematicsReport as inadecuate




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The identification of on-going planet formation requires the finest angular resolutions and deepest sensitivitiesin observations inspired by state-of-the-art numerical simulations. Hydrodynamic simulations of planetdiskinteractions predict the formation of circumplanetary disks CPDs around accreting planetary cores.These CPDs have eluded unequivocal detection –their identification requires predictions in CPD tracers. Inthis work, we aim to assess the observability of embedded CPDs with ALMA as features imprinted in thegas kinematics. We use 3D Smooth Particle Hydrodynamic SPH simulations of CPDs around 1 and 5 MJupplanets at large stellocentric radii, in locally isothermal and adiabatic disks. The simulations are then connectedwith 3D radiative transfer for predictions in CO isotopologues. Observability is assessed by corrupting withrealistic long baseline phase noise extracted from the recent HL Tau ALMA data. We find that the presence ofa CPD produces distinct signposts: 1 compact emission separated in velocity from the overall circumstellardisk’s Keplerian pattern, 2 a strong impact on the velocity pattern when the Doppler shifted line emissionsweeps across the CPD location, and 3 a local increase in the velocity dispersion. We test our predictionswith a simulation tailored for HD 100546 –which has a reported protoplanet candidate. We find that the CPDsare detectable in all 3 signposts with ALMA Cycle 3 capabilities for both 1 and 5 MJup protoplanets, whenembedded in an isothermal diskNota general

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Author: Pérez, Sebastián; - Dunhill, A.; - Casassus Montero, Simón; - Román Asenjo, Pablo; - Szulágyi, J.; - Flores, C.; - Marino Es

Source: http://repositorio.uchile.cl/



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