Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusm.p41a..11l&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #P41A-11
Other
5205 Formation Of Stars And Planets, 5410 Composition (1060, 3672), 6207 Comparative Planetology, 6296 Extra-Solar Planets
Scientific paper
The elemental abundances of the Sun provided the raw material for the terrestrial planets. The most obvious pattern is the extreme depletion in the terrestrial planets of the most volatile elements: hydrogen (H) and the noble gases (He, Ne, Ar). The abundances of the most refractory elements, (Mg, Si, Fe Al, Ca, Ni, Cr, Ti and Co) are virtually identical in the Sun and terrestrial planets. The distribution of elemental abundances in Mercury, Venus, Earth and Mars is a measure of how different terrestrial objects can be, starting from the same solar material. The observed range then gives us preliminary estimates of the range of elemental depletion in the terrestrial planets orbiting nearby stars. An increasingly large body of observations of circumstellar accretion disks, including infra-red spectroscopy sensitive to mineralogy suggests that the fundamental aspects of the accretion and fractionation processes that led to the depletion pattern in our Solar System are universal. Elemental volatility is universal within the range of temperatures and pressures expected in protoplanetary disks. That is, terrestrial planets around other stars will have refractory elemental abundances that match their host stars. Also, terrestrial planets will be severely depleted in the noble gases compared to their host stars. These simple plausible examples have major implications for the composition of terrestrial planets orbiting other stars - - stars whose relative abundances of refractory elements can vary by factors of at least two compared to the Sun. Based on this and other evidence we assess the universality of the elemental depletion pattern seen in our Solar System.
Lineweaver Charles H.
Robles Jorge A.
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