Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-07-27
Astron.Astrophys. 427 (2004) 965-973
Astronomy and Astrophysics
Astrophysics
24 pages, 18 figures, accepted by A&A
Scientific paper
10.1051/0004-6361:20041528
Exoplanets host stars present a clear metallicity excess compared to stars without detected planets, with an average overabundance of 0.2 dex. This excess may be primordial, in which case the stars should be overmetallic down to their center, or it may be due to accretion in the early phases of planetary formation, in which case the stars would be overmetallic only in their outer layers. In the present paper, we show the differences in the internal structure of stars, according to the chosen scenario. Namely two stars with the same observable parameters (luminosity, effective temperature, outer chemical composition) are completely different in their interiors according to their past histories, which we reconstitute through the computations of their evolutionary tracks. It may happen that stars with an initial overmetallicity have a convective core while the stars which suffered accretion do not. We claim that asteroseismic studies of these exoplanets host stars can give clues about their internal structures and metallicities, which may help in understanding planetary formation.
Bazot Michael
Vauclair Sylvie
No associations
LandOfFree
Asteroseismology of exoplanets hosts stars : tests of internal metallicity does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Asteroseismology of exoplanets hosts stars : tests of internal metallicity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Asteroseismology of exoplanets hosts stars : tests of internal metallicity will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-261293