Sousa, S. G.; Adibekyan, V.; Delgado-Mena, E.; Santos, N. C.; Andreasen, D. T.; Ferreira, A. C. S.; Tsantaki, M.; Barros, S. C. C.; Demangeon, O.; Israelian, G.; Faria, J. P.; Figueira, P.; Mortier, A.; Brandão, I.; Montalto, M.; Rojas-Ayala, B.; Santerne, A.
Astronomy & Astrophysics, Volume 620, id.A58, 13 pp.
Context. Exoplanets have now been proven to be very common. The number
of its detections continues to grow following the development of better
instruments and missions. One key step for the understanding of these
worlds is their characterization, which mostly depend on their host
stars. Aims: We perform a significant update of the Stars With
ExoplanETs CATalog (SWEET-Cat), a unique compilation of precise stellar
parameters for planet-host stars provided for the exoplanet community.
Methods: We made use of high-resolution spectra for planet-host
stars, either observed by our team or found in several public archives.
The new spectroscopic parameters were derived for the spectra following
the same homogeneous process (ARES+MOOG). The host star parameters were
then merged together with the planet properties listed in exoplanet.eu
to perform simple data analysis. Results: We present new
spectroscopic homogeneous parameters for 106 planet-host stars.
Sixty-three planet hosts are also reviewed with new parameters. We also
show that there is a good agreement between stellar parameters derived
for the same star but using spectra obtained from different
spectrographs. The planet-metallicity correlation is reviewed showing
that the metallicity distribution of stars hosting low-mass planets
(below 30 M⊕) is indistinguishable from that from the
solar neighborhood sample in terms of metallicity distribution.
Based on observations collected at the European Organisation for
Astronomical Research in the Southern Hemisphere under ESO programs
096.C-0092, 097.C-0280, 098.C-0151, and data obtained from the ESO
Science Archive Facility under several requests (request numbers
273579-274977).Tables A.1-A.3 and the catalog are also available at the
CDS via anonymous ftp to http://cdsarc.u-strasbg.fr
) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/620/A58
Observational Tests of the Processes of Nucleosynthesis in the Universe
Several spectroscopic analyses of stars with planets have recently been carried out. One of the most remarkable results is that planet-harbouring stars are on average more metal-rich than solar-type disc stars. Two main explanations have been suggested to link this metallicity excess with the presence of planets. The first of these, the “self