Tropospheric gas composition of Jupiter's north equatorial belt (NH/sub 3/, PH/sub 3/, CH/sub 3/D, GeH/sub 4/, H/sub 2/O) and the Jovian D/H isotopic ratio
The gas composition of the troposphere of Jupiter in the clearest regions of the North Equatorial Belt (NEB) was derived from the Voyager 1 IRIS data. The infrared spectrum for this homogeneous ''cloud-free'' region was modeled to infer altitude profiles for NH/sub 3/, PH/sub 3/, CH/sub 3/D, GeH/sub 4/, and H/sub 2/O. The profiles for NH/sub 3/ and PH/sub 3/ were found to be depleted in the upper troposphere but otherwise in agreement with their solar values at the 1 bar level. The mole fraction for CH/sub 3/D was determined to be 3.5/sup +1.0//sub -1.3/ x 10/sup -7/. The GeH/sub 4/ mole fraction of 7 +- 2 x 10/sup -10/ at the 2-5 bar level is a factor of 10 lower than the solar value. The H/sub 2/O mole fraction is approx.1 x 10/sup -6/ at the 2.5 bar level and is increasing to approx.3 x 10/sup -5/ at 4 bars where it is a factor of 30 lower than solar. Using IRIS inferred values for the mole fractions of CH/sub 3/D and CH/sub 4/ a value of D/H = 3.6/sup +1.0//sub -1.4/ x 10/sup -5/ is derived. Assuming this Jovian D/H ratio is representative of the protosolar nebula, and correcting for chemical galactic evolution, yields a value of 5.5--9.0 x 10/sup -5/ for the primordial D/H ratio and an upper limit of 1.8--2.4 x 10/sup -31/ g cm/sup -3/ for the present-day baryon density.
- Research Organization:
- NASA Goddard Space Flight Center
- OSTI ID:
- 5637226
- Journal Information:
- Astrophys. J.; (United States), Vol. 263:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
JUPITER PLANET
CHEMICAL COMPOSITION
PLANETARY ATMOSPHERES
DEUTERIUM
EMISSION SPECTRA
HYDROGEN
HYDROGEN COMPOUNDS
INFRARED SPECTRA
ISOTOPE RATIO
PHOTOCHEMISTRY
RADIATION TRANSPORT
SOLAR NEBULA
WATER
ATMOSPHERES
CHEMISTRY
ELEMENTS
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
NEBULAE
NONMETALS
NUCLEI
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
PLANETS
SPECTRA
STABLE ISOTOPES
640107* - Astrophysics & Cosmology- Planetary Phenomena