A dual origin for Neptune's carbon monoxide?

Details A dual origin for Neptune's carbon monoxide? A dual origin for Neptune's carbon monoxide?

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...430l..37l&link_type=abstract

Astronomy and Astrophysics, v.430, p.L37-L40 (2005)

Astronomy and Astrophysics

Astrophysics

20

Planets And Satellites: Neptune, Radio-Lines: Solar System

Scientific paper

Heterodyne observations of Neptune have provided a measurement of the CO(2-1) line profile with a total bandpass of almost 8 GHz and a resolution of 4 MHz. The lineshape indicates that the CO mole fraction in Neptune's atmosphere is not uniform, but increases by a factor of ˜2 from the troposphere/lower stratosphere (0.5 ppm at p>20 mbar) to the upper stratosphere (1 ppm at p<20 mbar). This indicates the existence of both external and internal sources of CO. The equivalent flux associated with the external source is ˜1×108 cm-2 s-1. We propose that the stratospheric CO results from a large (2 km) cometary impact that occurred ˜200 years ago, although there remains problems with this hypothesis.

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