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Thermal Infrared Spectra of Comet Hale-Bopp at Heliocentric Distances of 4 and 2.9 AU |
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| Authors: | Davis John K Geballe Thomas R Hanner Marthe S Weaver H A Crovisier Jacques Bockelée-Morvan Dominique |
| Institution: | (1) Joint Astronomy Centre, 660 N A' Ohoku Pl, Hilo, Hi 96720, USA;(2) Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, California, USA;(3) Department of Physics and Astronomy, John Hopkins University, Baltimore, Maryland, USA;(4) Observatoire de Paris-Meudon, Meudon, F-92195, France |
| Abstract: | We present 10 and 20 μm spectra of comet Hale-Bopp taken at UKIRT on 1996 June 20 and 1996 September 29.The 10 μm spectra clearly show a strong silicate feature with peaks at 10.0 and 11.2 μm. The 20 μm spectrum on September 29 has strong excess flux relative to a blackbody and a peak near 19μm, in good agreement with the ISO SWS spectra obtained a week later. However, the 20 μm spectrum on June 20 has significantly lower flux than would be expected based on a blackbody extrapolation from the flux at 12.5 μm. This revised version was published online in July 2006 with corrections to the Cover Date. |
| Keywords: | Comet infrared dust silicates |
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