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Detection of the 3.4- and 2.8-micron emission features in Comet Bradfield (1987s) (1990)

Tokunaga, A. T. ; Mumma, M. J. ; Brooke, T. Y. ; [et al.]

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Publication Date: 2019-07-12

Description: Comet Bradfield's 3.4-micron C-H emission feature at 3.4 microns, as well as the emission feature near 2.8 microns, exhibit spectral shapes similar to those noted in Comets Halley and Wilson; the derived abundances of the C-H bonds in all three comets are also comparable (within water production rate uncertainties). These data support the hypothesis that the species responsible for the 3.4- and 2.8-micron features may be common to all comets. Beyond this, the widely differing ages of the three comets suggest that the 3.4-micron feature-emitting organics are not the product of surface irradiation processes after the comets' formation.

Keywords: ASTROPHYSICS

Type: Icarus (ISSN 0019-1035); 83; 434-440

Format: text

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