Theories of planetary formation: constraints from the study of meteorites

Citation
R. Hutchison et al., Theories of planetary formation: constraints from the study of meteorites, PHI T ROY A, 359(1787), 2001, pp. 2077-2091
Citations number
39
Categorie Soggetti
Multidisciplinary
Journal title
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
ISSN journal
1364503X → ACNP
Volume
359
Issue
1787
Year of publication
2001
Pages
2077 - 2091
Database
ISI
SICI code
1364-503X(20011015)359:1787<2077:TOPFCF>2.0.ZU;2-G
Abstract
Compositional variations between chondrite groups and the inventory of shor t-lived nuclides once present in them are consistent with an origin in the accretion disc of a T Tauri protosun. T Tauri outbursts reprocessed infalli ng matter, part of which was recycled back into the disc. Chondrites and ra pidly cooled igneous meteorites together form the basis of a chronology of events over the first 50 Myr of Solar System history. Chondrites contain ev idence of hypervelocity impact within 2 Myr of the formation of the Solar S ystem. This requires the local presence of a Jupiter-massed object to pump up relative velocities. Capture of an interstellar cloudlet, which subseque ntly underwent gravitational collapse, or of an unbound planet is implied. Capture at a low inclination and high eccentricity would have stirred the m atter in the accretion disc, triggered planetesimal formation and growth, s tabilized the orbit of the proto-Jupiter, and ended the T Tauri phase of th e protosun.