Physics of low mass stars, brown dwarfs and extrasolar planets
In this thesis, we studied a range of problems linked to sub-stellar objects, using principally, two codes developed in the Lyon group, the phoenix atmosphereradiative transfer code and the Lyon stellar evolution code. We studied the effect of accretion on the properties of young low mass stars and...
| Autor: | |
|---|---|
| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2007 |
| País: | Chile |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.anid.cl:10533/180507 |
| Acceso en línea: | http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ https://hdl.handle.net/10533/180507 |
| Access Level: | acceso abierto |
| Sumario: | In this thesis, we studied a range of problems linked to sub-stellar objects, using principally, two codes developed in the Lyon group, the phoenix atmosphereradiative transfer code and the Lyon stellar evolution code. We studied the effect of accretion on the properties of young low mass stars and brown dwarfs; we analyzed the most recent opacity line lists of molecules present in the atmospheres of M-dwarf stars, with the aim to better describe observed spectra in the optical and near-IR wavelengths and the photometry of LMSs. Moreover, we studied the mass-radius and Teff-radius relationships in low mass star eclipsing binary systems in order to understand the discrepancies between current models andobservational data. We also developed a fast technique to pre-select the mostpromising extrasolar planet candidates from transits surveys for follow-up observations.Furthermore, we carried out observations of an exoplanet host star inoptical and infrared bands and we did a bibliographic work, focusing our intereston the lithium abundance in stars as a possible tracer indicating the presence of a planets companion. |
|---|