HALOGENS IN THE GIANT PLANETS - UPPER LIMITS TO HBR IN SATURN AND JUPITER

Authors
Citation
Ks. Noll, HALOGENS IN THE GIANT PLANETS - UPPER LIMITS TO HBR IN SATURN AND JUPITER, Icarus, 124(2), 1996, pp. 608-615
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Astronomy & Astrophysics
Journal title
IcarusACNP
ISSN journal
0019-1035
Volume
124
Issue
2
Year of publication
1996
Pages
608 - 615
Database
ISI
SICI code
0019-1035(1996)124:2<608:HITGP->2.0.ZU;2-G
Abstract
I have searched for absorptions from the molecule HBr in the 4 mu m sp ectra of Jupiter and Saturn and find upper limits to the mole fraction of HBr to be q(HBr) less than or equal to 1.6 ppb in Saturn and q(HBr ) less than or equal to 3 ppb in Jupiter, or two and four times the so lar abundance of bromine in Saturn and Jupiter, respectively. The uppe r limit for Saturn is lower than the global abundance of bromine, if, as expected, bromine is enriched in Saturn relative to C1 carbonaceous chondrites. This deficiency is most likely the result of local sinks for HBr. Less likely is a global depletion of bromine, conceivably rel ated to the low condensation temperature of bromine-containing solids in the presolar nebula. Searches for HCl in the 4 mu m window are also possible, but require large enrichments of Cl for detection with exis ting data. (C) 1996 Academic Press, Inc.