When Did Venus Lose Its Water ?

Details When Did Venus Lose Its Water ? When Did Venus Lose Its Water ?

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dps....30.5503d&link_type=abstract

American Astronomical Society, DPS meeting #30, #55.P03; Bulletin of the American Astronomical Society, Vol. 30, p.1447

Astronomy and Astrophysics

Astronomy

Scientific paper

I will present a critical assessment of several recent attempts to determine the rates at which Venus is losing hydrogen and deuterium. I will then show that the most commonly derived present day escape rates - in the range from 107 to 4 x 107cm-2s-1 for hydrogen with a fractionation factor between 0 and 0.15 - require that evacution of the hydorgen belonging to a water reservoir with an original D/H ratio of 1.6 x 10-4 have occurred during the past 0.4 to 2.5 billion years to produce the observed 150 fold enhancement in D/H. The scenario depends on the strength of sources with D/H in the range 1.5 to 4 x 10-4 only if the escape flux of hydrogen is now considerably less than 107cm-2s1 and the fractionation factor greater than 0.4 could the escape episode have lasted for as long as 4.5 billion years and not produce an excessive D/H enrichment.

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