Analysis of High Resolution Spectra of Eris: Possible Evidence for Cold Phase CH4 Ice

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Scientific paper

We examined the spectrum of Eris by isolating the 1.67 and 1.72 μm CH4 bands and comparing these to Hapke models. These bands are chosen because (i) CH4(II) is more distinguished from CH4(I) at these wavelengths and (ii) the SNR of the observationswere higher than the bands longward of 1.8 μm. At the time of writing this abstract, the analysis was performed using optical constants for pure CH4 because of the lack of optical constants for CH4 diluted in N2 between 15 and 30 K.We assume the spectrum of Eris is a spectral blend of both CH4 phases. To model the spectrum, we used the CH4 optical constants from (11). CH4(II) ice is represented by their 20 K measurements, while optical constants for the CH4(I) ice is estimated from a linear interpolation between measurements at T > 30 K, or a second order extrapolation of the data at T > 30 to estimate the optical constants at 20.4 < T < 30 K. Each component is allowed to shift in wavelength.

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