Physics – Optics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.5507h&link_type=abstract
American Astronomical Society, DPS meeting #39, #55.07; Bulletin of the American Astronomical Society, Vol. 39, p.527
Physics
Optics
Scientific paper
We present the first published spatially resolved images of Neptune's thermal emission (Hammel et al. 2007, AJ 134, 637). Our 7.7- and 11.7-micron images, taken on 2005 July 4 and 5 at the Gemini North telescope, show enhanced methane and ethane emission within 30 dgrees 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 microns taken with the Keck II telescope on 2005 July 5. HBH acknowledges support for this work from NASA grants NAG5-11961, NAG5-10451, and NNG06GI25G. DKL & RWR acknowledge support from the Independent Research and Development Program at The Aerospace Corporation.
de Pater Imke
Geballe Thomas Ronald
Hammel Heidi Beth
Lynch David K.
Orton Glenn S.
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