INVESTIGADORES
PELLIZZA GONZALEZ Leonardo Javier
artículos
Título:
Transition disks: four candidates for ongoing giant planet formation in Ophiuchus
Autor/es:
ORELLANA, M.; CIEZA, L. A.; SCHREIBER, M. R.; MERÍN, B.; BROWN, J. M.; PELLIZZA, L. J.; ROMERO, G. A.
Revista:
ASTRONOMY AND ASTROPHYSICS
Editorial:
EDP SCIENCES S A
Referencias:
Lugar: Paris; Año: 2012 vol. 539 p. 1 - 4
ISSN:
0004-6361
Resumen:
Among the large set of Spitzer-selected transitional disks that we have
examined in the Ophiuchus molecular, four disks have been identified as
(giant) planet-forming candidates based on the morphology of their
spectral energy distributions (SEDs), their apparent lack of stellar
companions, and evidence of accretion. Here we characterize the
structures of these disks modeling their optical, infrared, and
(sub)millimeter SEDs. We use the Monte Carlo radiative transfer package
RADMC to construct a parametric model of the dust distribution in a
flared disk with an inner cavity and calculate the temperature structure
that is consistent with the density profile, when the disk is in thermal
equilibrium with the irradiating star. For each object, we conducted a
Bayesian exploration of the parameter space generating Monte Carlo
Markov chains (MCMC) that allow the identification of the best-fit model
parameters and to constrain their range of statistical confidence. Our
calculations imply that evacuated cavities with radii ~2-8 AU are
present that appear to have been carved by embedded giant planets. We
found parameter values that are consistent with those previously given
in the literature, indicating that there has been a mild degree of grain
growth and dust settling, which deserves to be investigated with further
modeling and follow-up observations. Resolved images with
(sub)millimeter interferometers would be required to break some of the
degeneracies of the models and more tightly constrain the physical
properties of these fascinating disks.