Distribution of Ethane and Methane Emission on Neptune

Details Distribution of Ethane and Methane Emission on Neptune Distribution of Ethane and Methane Emission on Neptune

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aj....134..637h&link_type=abstract

The Astronomical Journal, Volume 134, Issue 2, pp. 637-641.

Astronomy and Astrophysics

Astronomy

7

Infrared: Solar System, Planets And Satellites: Individual: Neptune

Scientific paper

We present the first published spatially resolved images of Neptune's thermal emission. Our 7.7 and 11.7 μm images, taken on 2005 July 4 and 5 at the Gemini North telescope, show enhanced methane and ethane emission within 30° of the south pole. This bright polar region is the first direct imaging evidence for radiative forcing of Neptune's stratosphere, similar to that seen on Saturn. Enhanced emission from ethane, but not methane, also emerges from the planetary limb, suggesting differing vertical profiles. Stratospheric emissions are uncorrelated with tropospheric clouds seen in reflected sunlight in our near-simultaneous adaptive optics images at 1.6 and 2.2 μm taken with the Keck II telescope on 2005 July 5.
Based on observations at the Gemini and Keck Telescopes on Mauna Kea, Hawaii.

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