Artículos de revistas
Planet Formation Signposts: Observability of Circumplanetary Disks Via Gas Kinematics
Fecha
2015Registro en:
Astrophysical Journal Letters Volumen: 811 Número: 1 Número de artículo: L5 (2015)
2041-8205
DOI: 10.1088/2041-8205/811/1/L5
Autor
Pérez, Sebastián
Dunhill, A.
Casassus Montero, Simón
Román Asenjo, Pablo
Szulágyi, J.
Flores, C.
Marino Estay, Sebastián
Montesinos, Matías
Institución
Resumen
The identification of on-going planet formation requires the finest angular resolutions and deepest sensitivities
in observations inspired by state-of-the-art numerical simulations. Hydrodynamic simulations of planetdisk
interactions predict the formation of circumplanetary disks (CPDs) around accreting planetary cores.
These CPDs have eluded unequivocal detection –their identification requires predictions in CPD tracers. In
this work, we aim to assess the observability of embedded CPDs with ALMA as features imprinted in the
gas kinematics. We use 3D Smooth Particle Hydrodynamic (SPH) simulations of CPDs around 1 and 5 MJup
planets at large stellocentric radii, in locally isothermal and adiabatic disks. The simulations are then connected
with 3D radiative transfer for predictions in CO isotopologues. Observability is assessed by corrupting with
realistic long baseline phase noise extracted from the recent HL Tau ALMA data. We find that the presence of
a CPD produces distinct signposts: 1) compact emission separated in velocity from the overall circumstellar
disk’s Keplerian pattern, 2) a strong impact on the velocity pattern when the Doppler shifted line emission
sweeps across the CPD location, and 3) a local increase in the velocity dispersion. We test our predictions
with a simulation tailored for HD 100546 –which has a reported protoplanet candidate. We find that the CPDs
are detectable in all 3 signposts with ALMA Cycle 3 capabilities for both 1 and 5 MJup protoplanets, when
embedded in an isothermal disk