Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.366..283g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 366, Issue 1, pp. 283-286.
Astronomy and Astrophysics
Astronomy
27
Circumstellar Matter, Planetary Systems: Formation, Planetary Systems: Protoplanetary Discs
Scientific paper
We investigate the populations of main-sequence stars within 25 pc that have debris discs and/or giant planets detected by Doppler shift. The metallicity distribution of the debris sample is a very close match to that of stars in general, but differs with >99 per cent confidence from the giant planet sample, which favours stars of above average metallicity. This result is not due to differences in age of the two samples. The formation of debris-generating planetesimals at tens of au thus appears independent of the metal fraction of the primordial disc, in contrast to the growth and migration history of giant planets within a few au. The data generally fit a core accumulation model, with outer planetesimals forming eventually even from a disc low in solids, while inner planets require fast core growth for gas to still be present to make an atmosphere.
Fischer Debra Ann
Greaves Jane S.
Wyatt Mark C.
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