Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23...11d&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 11-12
Astronomy and Astrophysics
Astronomy
Scientific paper
Since the pioneering discovery of a planet orbiting the low-mass subgiant star 51 Pegasi (51 Peg) by Mayor and Queloz (1995, Nature, 378 355), there are now in the literature some 110 stars with planets. Among the most exciting and enigmatic properties of stars harboring such planets are those concerning the planet eccentricity distribution of the orbits and the fact the stars with planets appear to be very metal rich when compared with dwarf stars in the solar neighborhood. In this study we present, for the first time, the IRAS color-color diagrams for the hosting planets stars listed in the IRAS data basis. The major goal of this work is to check for any infrared particularity between planet host stars and a volume limited sample of stars without any known giant planets. As a first result we have found a clear trend for two particular infrared behaviors: a subsample of planet hosting stars with strong IR features paralleling most of the stars without any known giant planets and a subsample of planet host stars with no significant IR features located at the same IRAS color-color diagram where stars with shells are expected. The evolutionary status of the sample as well as the individual masses have been determined using the HIPPARCOS trigonometric parallax measurements and evolutionary tracks computed from the Toulouse-Geneva code for stellar masses between 1 and 4 M¤ and for metallicity consistent with solar-type subgiant stars as do Nascimento et al 2000, A&A 357, 931.
de Medeiros Jose Renan
do Nascimento D.. Jr. J.
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