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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 226048.0, MPI für Astronomie / Publikationen_mpia
ESO large program on Centaurs and TNOs: visible colors-final results
Authors:Peixinho, N.; Boehnhardt, H.; Belskaya, I.; Doressoundiram, A.; Barucci, M. A.; Delsanti, A.
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Icarus
Volume:170
Start Page:153
End Page:166
Review Status:not specified
Audience:Not Specified
Abstract / Description:We report 43 new visible colors of Centaurs
and TNOs, obtained at NTT and VLT telescopes
under the ``ESO large program on physical
properties of Centaurs and TNOs.'' Merging these
new measurements with those obtained during the
first part of the program (Boehnhardt et al.,
2002, Astron. Astrophys. 395, 297-303) and the
``Meudon Multicolor Survey'' (Doressoundiram et
al., 2002, Astron. J. 124, 2279-2296) we have a
unique dataset of 109 objects. We checked for
correlations and trends between colors, physical
and orbital parameters, carrying out an analysis
based on Monte Carlo simulation to account for
observational error bars. Centaurs show no
evidence for correlation between V-R vs. R-I
colors which raises the hypothesis that more than
one single coloring process might be acting on
their surfaces. Classical objects seem to be
composed of two different color populations:
objects with i<4.5° display only red colors
while those with i>4.5° display the whole range
of colors from blue to very red. The possibility
that the low inclined population is misguiding
global conclusions is analyzed. Classical
objects also show a stronger color-perihelion
correlation for intrinsically brighter objects,
corresponding to critical estimated sizes of
different formation/evolutionary histories.
Scattered disk objects show color resemblances
with the classical objects at i>12°, hence
surface reflectivities resemblances, pointing to
a common origin. No color-aphelion trend is found
for SDOs, as expected from the intense
irradiation by galactic cosmic-rays beyond the
solar wind termination shock. Plutinos show a
color-absolute magnitude trend, in which all the
intrinsically faintest objects are blue. We see
many red Plutinos in highly inclined and highly
eccentric orbits, that should have originated in
a primordial inner disk under Gomes (2003,
Icarus 161, 404-418) migration scenario. This
seems to invalidate the assumption that objects
originated in this inner disk are mainly blue.
Finally, we also find six candidates for
light-curve studies: four objects (1998
WU31, 1999 OE4, 1999
OX3, and 2001 KP77) present
significant short term R-magnitude variability,
and two objects (1999 XX143 and 2000
GP183) evidence possible color
variations with rotation.
Free Keywords:Kuiper belt objects; Trans-neptunian objects; Centaurs; Photometry
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:AB(Max-Planck-Institut fÛr Astronomie,
Königstuhl 17, DE-69117 Heidelberg, Germany),
AC(), AD(LESIA, Observatoire de Paris, 5, pl.
Jules Janssen, FR-92195 Meudon cedex, France),
AE(LESIA, Observatoire de Paris, 5, pl. Jules
Janssen, FR-92195 Meudon cedex, France),
AF(LESIA, Observatoire de Paris, 5, pl. Jules
Janssen, FR-92195 Meudon cedex, France)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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