Forming the first planetary systems

Details Forming the first planetary systems Forming the first planetary systems

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30339g&link_type=abstract

Spitzer Proposal ID #30339

Mathematics

Logic

Scientific paper

Spitzer has discovered large numbers of debris disk systems, clarifying their relation to stellar age, spectral type, presence of Doppler planets, etc. Here we propose to search an uninvestigated sample of stars for debris: the nearby old Galactic stars that formed in the thick disk. These represent the earliest generations of stars in our Galaxy, and are characterised by low metals and perturbed orbits. Could these stars have formed planetary systems? The presence of debris is an indicator that bodies formed at least up to a few kilometres in size, and most of disk SED's support central clearing by a planet orbiting outside ~10 AU. We wish to test two contrasting hypotheses: that such early stars had inefficient planetesimal growth (0 detections expected), or that low metal content promotes slow-growing debris-and-outer-planet systems (high detection rate, ~5/15 stars). As well as clarifying the physics of planet-core formation, this project has astrobiological implications for the production of the earliest rocky planets of the Galaxy.

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