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Habilitation à diriger des recherches

Étude des conditions physiques dans les disques protoplanétaires par interférométrie. Théorie, instrumentation et premières observations.

Abstract : Stars are forming when clouds of gas and dust collapse. In the close environment of the new star, the matter is concentrated in an equatorial plane which is called protoplanetary disk. The astronomers think that planets are formed within this mass of gas and dust orbiting around the star. To probe these disks at scales corresponding to the orbits of the future planets, it is necessary to observe at very high spatial resolution in the infrared wavelength domain. Infrared interferometry is therefore an ideal tool to study the physical conditions in protoplanetary disks. In this document, I describe the first steps of infrared interferometry, from the beginning of the small interferometers PTI and IOTA until the construction of the AMBER instrument at the focus of the VLT Interferometer. I describe also the results of a technological research track, particularly attractive in the case of infrared interferometry, and coming from the information freeway: the integrated optics applies to the combination of several beams in astronomy. I show then how from observations obtained from these instruments, it is possible to constrain the physics of disks around young stars. Thanks to the spectral resolution recently available on these instruments, for the first time, we can separate the physical phenomena as different as accretion of matter onto the star and the ejection of particles by winds whose precise origin is still not well known. The results presented in this document were obtained mainly from observations on the young systems FU Ori and MWC 297 and performed by AMBER on the VLTI, but also by the small infrared interferometers PTI and IOTA. I tackle also the modeling of the vertical structure of those disks in order to show the wealth of obtained information. Finally I draw the contours of a research program that will allow first the VLTI astrophysical return to be maximized, and then the first interferometric images of these circumstellar environments to be obtained. I also propose to build a second generation instrument for the VLTI which will bring detailed interferometric images by aperture synthesis of these compact sources.
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Habilitation à diriger des recherches
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Submitted on : Wednesday, November 21, 2007 - 5:17:57 PM
Last modification on : Friday, November 6, 2020 - 4:01:39 AM
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Fabien Malbet. Étude des conditions physiques dans les disques protoplanétaires par interférométrie. Théorie, instrumentation et premières observations.. Astrophysique [astro-ph]. Université Joseph-Fourier - Grenoble I, 2007. ⟨tel-00189697⟩

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