Other
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.6301m&link_type=abstract
American Astronomical Society, DPS meeting #38, #63.01; Bulletin of the American Astronomical Society, Vol. 38, p.610
Other
Scientific paper
A moderately massive early Sun has been proposed to resolve the so--called faint early Sun paradox. We calculate the time--evolution of the solar mass that would be required by this hypothesis, using a one--dimensional climate model for Earth. Initial solar masses of between 1.025-1.07 M&sun; with the significant portion of the mass loss occurring over a timescale of 2 billion years is required to resolve the faint early Sun paradox. The required time history of mass loss from the Sun is significantly at variance with that derived from astronomical observations of mass loss rates in younger solar analogues. Because we cannot rule out that the Sun had a mass loss history different from the observed small sample of stars, we also examine the effects of the hypothetical historical solar mass loss on orbital dynamics in the solar system, with a view to identifying additional tests of the hypothesis. We find that, for a more massive sun, ratios of planetary orbital spacings remain constant, relative locations of planetary mean motion and secular resonances remain constant, but resonance widths increase as the square of the solar mass, and that the Hill's spheres around all planets increase, consequently stabilizing weakly captured satellites of the outer giant planets. The dynamics of objects near resonances with the planets as well as the dynamics of distant irregular satellites of the giant planets may contain the signature of a more massive sun. Other dynamical events in the early Solar System, such as the accretion and presumed migration of the gas giant planets are already more than adequate to explain any dynamical signatures that might be attributed to a Sun with an initial mass considered here. We acknowledge research support from NASA and NAI.
Malhotra Renu
Minton David A.
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