2005ApJ...623.1221V

Query : 2005ApJ...623.1221V

2005ApJ...623.1221V - Astrophys. J., 623, 1221-1227 (2005/April-3)

Chemical constraints on the water and total oxygen abundances in the deep atmosphere of Saturn.

VISSCHER C. and FEGLEY B.Jr

Abstract (from CDS):

Thermochemical equilibrium and kinetic calculations for the trace gases CO, PH3, and SiH4give three independent constraints on the water and total oxygen abundances of Saturn's deep atmosphere. A lower limit to the water abundance of H2O/H2≥(1.7+0.7–0.4)x10–3 is given by CO chemistry, whereas an upper limit of H2O/H2≤(5.5+0.8–2.5)x10–3 is given by PH3chemistry. A combination of the CO and PH3constraints indicates a water enrichment on Saturn of 1.9-6.1 times the solar system abundance (H2O/H2=8.96x10–4). The total oxygen abundance must be at least 1.7 times the solar system abundance (O/H2=1.16x10–3) in order for SiH4to remain below the detection limit of SiH4/H2<2x10–10. A combination of the CO, PH3, and SiH4constraints suggests that the total oxygen abundance on Saturn is 3.2-6.4 times the solar system abundance. Our results indicate that oxygen on Saturn is less enriched than other heavy elements (such as C and P) relative to the solar system composition.

Abstract Copyright: ∼

Journal keyword(s): Planets and Satellites: Individual: Saturn

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 549 0

Query : 2005ApJ...623.1221V

Basic data :
HD 42581B -- Brown Dwarf
Other object types: otypes_help 		* (CNS5,GJ,...), ** (2024ApJ,**,...), BD* (1999ApJ), Rad ([B2006])
ICRS coord. (ep=J2000) : 		06 10 34.80 -21 52 00.0 [ ] C 2009AJ....137....1F
FK4 coord. (ep=B1950 eq=1950) : 		06 08 28.33 -21 50 42.7 [ ]
Gal coord. (ep=J2000) : 		228.61456 -18.43930 [ ]
Proper motions mas/yr : 		-137.0 -714.1 [0.9 0.6 0] D 2009AJ....137....1F
Parallaxes (mas): 		173.19 [1.12] C 2012ApJ...752...56F
Spectral type: 		T6.5 C 2000ApJ...531L..57B
Fluxes (3) :
J 14.01 [0.05] C 2012ApJ...752...56F
H 14.36 [0.05] C 2012ApJ...752...56F
K 14.36 [0.05] C 2012ApJ...752...56F
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Identifiers (7) :
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** NAJ 1B GJ 229 B 8pc 173.19B [B2006] J061035.1-215117
CNS5 1529 HD 42581B WDS J06106-2152B

References (549 between 1850 and 2026) (Total 549)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Distance : 2    Plx : 1    SpT : 6   

   

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GJ 229 B HD 42581B WDS J06106-2152B

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