Protoplanetary disk evolution in nearby star-forming regions
24-07-2015 TESIS DEL CAB


Álvaro Ribas Gómez defended in the Sala de conferencias del módulo 0 de la Facultad de Ciencias de la Universidad Autónoma de Madrid his thesis entitled "Protoplanetary disk evolution in nearby star-forming regions" directed by Bruno Merín Martín y Hervé Bouy obtaining the higest qualification.

Protoplanetary disks are the place where planet formation occurs, and therefore they are crucial to explain the large diversity observed in planetary systems. In this thesis, we compile a large sample of young stellar objects in nearby star-forming associations to study the evolution of these disks. Thanks to the size of the sample and careful bias corrections, we improve previous estimates of disk lifetimes and obtain the first statistical evidence of a dependence with stellar mass. This dependence may have important consequences in planet formation and exoplanetary populations. Additionally, we use Herschel data to study transitional disks (disks with gaps in them, maybe a signature of planet formation) in the Chamaeleon-I region. We show that Herschel far infrared observations are a powerful tool for identifying these kind of targets. Finally, we combine Bayesian and Markov Chain Monte Carlo techniques to model these targets, proving that Herschel data can also be used to constrain the mass of dust in these disks.


Fuente: UCC-CAB

Fecha: 2015-07-24


Imágenes adicionales:

Región estelar cercana (Chamaeleon-I) vista por Herschel. Créditos: HERSCHEL/ESA.
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