Infrared Spectroscopy (2.5-5.0 Microns) of Triton's Surface Ices with AKARI IRC

Details Infrared Spectroscopy (2.5-5.0 Microns) of Triton's Surface Ices with AKARI IRC Infrared Spectroscopy (2.5-5.0 Microns) of Triton's Surface Ices with AKARI IRC

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....40.4607c&link_type=abstract

American Astronomical Society, DPS meeting #40, #46.07; Bulletin of the American Astronomical Society, Vol. 41, p.562

Astronomy and Astrophysics

Astronomy

Scientific paper

Disk-integrated spectra of Triton were recorded on 2007-05-13, between 1.8 and 5.5 microns, using both the prism and the grism of the Infrared Camera on board ISAS/JAXA's AKARI satellite. The spectral resolving power was about 140 in the interval covered with the grism (2.5 - 5 microns) and some 20 with the prism. As Neptune was included in the field of view at a distance of only 6 arcsec in the cross-dispersion direction, we had to subtract its contribution to the spectra.
The spectra from the two dispersion elements are in good agreement, with differences being typically less than 10%. In the region 2.8-3.8 microns our data of Triton resemble the Pluto spectrum presented at the DPS meeting 2007 (Protopapa et al.), but at longer wavelengths Pluto's albedo increases, whereas Triton's goes down. At 4.2 microns we find a feature that is due to molecular nitrogen or carbon dioxide ice; it can be seen only from space. Of particular interest is also the indication of an absorption feature at about 4.65 um, which could be a nitrile band with some CO contribution. As the CO ice absorption on Triton is known already from a band at 2.35 microns, the much stronger band at about 4.65 microns should indeed be visible on Triton.

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