Matches in SemOpenAlex for { <https://semopenalex.org/work/W4308198936> ?p ?o ?g. }
- W4308198936 endingPage "247" @default.
- W4308198936 startingPage "247" @default.
- W4308198936 abstract "Abstract CO and CO 2 are the two dominant carbon-bearing molecules in comae and have major roles in driving activity. Their relative abundances also provide strong observational constraints to models of solar system formation and evolution but have never been studied together in a large sample of comets. We carefully compiled and analyzed published measurements of simultaneous CO and CO 2 production rates for 25 comets. Approximately half of the comae have substantially more CO 2 than CO, about one-third are CO-dominated, and about 1/10 produce a comparable amount of both. There may be a heliocentric dependence to this ratio with CO dominating comae beyond 3.5 au. Eight out of nine of the Jupiter Family Comets in our study produce more CO 2 than CO. The six dynamically new comets produce more CO 2 relative to CO than the eight Oort Cloud comets that have made multiple passes through the inner solar system. This may be explained by long-term cosmic-ray processing of a comet nucleus’s outer layers. We find ( Q CO / Q <?CDATA ${}_{{{rm{H}}}_{2}{rm{O}}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mrow /> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi mathvariant=normal>H</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> <mml:mi mathvariant=normal>O</mml:mi> </mml:mrow> </mml:msub> </mml:math> ) median = 3 ± 1% and ( Q <?CDATA ${}_{{mathrm{CO}}_{2}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mrow /> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>CO</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> </mml:mrow> </mml:msub> </mml:math> / Q <?CDATA ${}_{{{rm{H}}}_{2}{rm{O}}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mrow /> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi mathvariant=normal>H</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> <mml:mi mathvariant=normal>O</mml:mi> </mml:mrow> </mml:msub> </mml:math> ) median = 12 ± 2%. The inorganic volatile carbon budget was estimated to be ( Q CO + Q <?CDATA ${}_{{mathrm{CO}}_{2}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mrow /> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>CO</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> </mml:mrow> </mml:msub> </mml:math> )/ Q <?CDATA ${}_{{{rm{H}}}_{2}{rm{O}}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mrow /> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi mathvariant=normal>H</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> <mml:mi mathvariant=normal>O</mml:mi> </mml:mrow> </mml:msub> </mml:math> ∼ 18% for most comets. Between 0.7 and 4.6 au, CO 2 outgassing appears to be more intimately tied to the water production in a way that the CO is not. The volatile carbon/oxygen ratio for 18 comets is C/O median ∼ 13%, which is consistent with a comet formation environment that is well within the CO snow line." @default.
- W4308198936 created "2022-11-09" @default.
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- W4308198936 creator A5030237029 @default.
- W4308198936 creator A5075563134 @default.
- W4308198936 creator A5088468878 @default.
- W4308198936 date "2022-11-01" @default.
- W4308198936 modified "2023-10-18" @default.
- W4308198936 title "A Survey of CO, CO<sub>2</sub>, and H<sub>2</sub>O in Comets and Centaurs" @default.
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