Bibcode
Ammler-von Eiff, M.; Santos, N. C.; Sousa, S. G.; Fernandes, J.; Guillot, T.; Israelian, G.; Mayor, M.; Melo, C.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 507, Issue 1, 2009, pp.523-530
Fecha de publicación:
11
2009
Revista
Número de citas
51
Número de citas referidas
47
Descripción
Context: The analysis of transiting extra-solar planets provides an
enormous amount of information about the formation and evolution of
planetary systems. A precise knowledge of the host stars is necessary to
derive the planetary properties accurately. The properties of the host
stars, especially their chemical composition, are also of interest in
their own right. Aims: Information about planet formation is
inferred by, among others, correlations between different parameters
such as the orbital period and the metallicity of the host stars. The
stellar properties studied should be derived as homogeneously as
possible. The present work provides new, uniformly derived parameters
for 13 host stars of transiting planets. Methods: Effective
temperature, surface gravity, microturbulence parameter, and iron
abundance were derived from spectra of both high signal-to-noise ratio
and high resolution by assuming iron excitation and ionization
equilibria. Results: For some stars, the new parameters differ
from previous determinations, which is indicative of changes in the
planetary radii. A systematic offset in the abundance scale with respect
to previous assessments is found for the TrES and HAT objects. Our
abundance measurements are remarkably robust in terms of the
uncertainties in surface gravities. The iron abundances measured in the
present work are supplemented by all previous determinations using the
same analysis technique. The distribution of iron abundance then agrees
well with the known metal-rich distribution of planet host stars. To
facilitate future studies, the spectroscopic results of the current work
are supplemented by the findings for other host stars of transiting
planets, for a total dataset of 50 objects.
Based on observations made with the Italian Telescopio Nazionale Galileo
(TNG) operated on the island of La Palma by the Fundación Galileo
Galilei of the INAF (Istituto Nazionale di Astrofisica) at the Spanish
Observatorio del Roque de los Muchachos of the Instituto de Astrofisica
de Canarias.
Based in part on observations made at Observatoire de Haute Provence
(CNRS), France.
Based on observations made with ESO Telescopes at the La Silla Paranal
Observatory under programme ID 080.C-0661.
Proyectos relacionados
Pruebas Observacionales de los Procesos de Nucleosíntesis en el Universo
Recientemente se han llevado a cabo varios análisis espectroscópicos de estrellas con planetas. Uno de los resultados más relevantes ha sido descubrir que las estrellas con planetas son en promedio más metálicas que las estrellas del mismo tipo espectral sin planetas conocidos (Santos, Israelian & Mayor 2001, A&A, 373, 1019; 2004, A&A, 415, 1153)
Garik
Israelian