Polarimetry of the dwarf planet (136199) Eris

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Authors
Belskaya, I.
Bagnulo, S.
Muinonen, K.
Barucci, M. A.
Tozzi, G. P.
Fornasier, S.
Kolokolova, L.
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Abstract
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We investigate the surface characteristics of the large dwarf planet (136199) Eris. With the FORS1 instrument of the ESO VLT, we have obtained Bessell broadband R linear polarimetry and broadband V and I photometry. We have modelled the observations in terms of the coherent-backscattering mechanism to constrain the surface properties of the object. Polarimetric observations of Eris show a small negative linear polarization without opposition surge in the phase angle range of 0.15-0.5 degrees. The photometric data allow us to suppose a brightness opposition peak at phase angles below 0.2-0.3 degrees. The data obtained suggest possible similarity to the polarimetric and photometric phase curves of Pluto. The measured absolute magnitude and broadband colors of Eris are H_V=-1.15, V-R=0.41, and V-I=0.75.
Comment: Accepted by A&A
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Astrophysics
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