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First Spitzer observations of Neptune: Detection of new hydrocarbons |
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| Authors: | Victoria S Meadows Glenn Orton Mao-Chang Liang Jeffrey Van Cleve |
| Institution: | a Spitzer Science Center/California Institute of Technology, MS 220-6, 1200 E. California Blvd, Pasadena, CA 91125, USA b Jet Propulsion Laboratory/California Institute of Technology, MS 169-237, 4800 Oak Grove Drive, Pasadena, CA 91109, USA c University of Wisconsin, Department of Astronomy, 5534 Sterling Hall, 475 N. Charter St., Madison, WI 53706, USA d California Institute of Technology, Geological and Planetary Sciences, 1200 E. California Blvd, Pasadena, CA 91125, USA e Ball Aerospace and Technologies Corp., 1600 Commerce St., Boulder, CO 80301, USA f Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead, CH41 1LD, UK |
| Abstract: | We present the first spectra of Neptune taken with the Spitzer Space Telescope, highlighting the high-sensitivity, moderate-resolution 10-20 μm (500-1000 cm−1) spectra. We report the discovery of methylacetylene (CH3C2H) and diacetylene (C4H2) with derived 0.1-mbar volume mixing ratios of (1.2±0.1)×10−10 and (3±1)×10−12 respectively. |
| Keywords: | Neptune atmosphere Spectroscopy Infrared observations Atmospheres composition |
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