Astronomy and Astrophysics – Astronomy
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003dps....35.3921s&link_type=abstract
American Astronomical Society, DPS meeting #35, #39.21; Bulletin of the American Astronomical Society, Vol. 35, p.993
Astronomy and Astrophysics
Astronomy
Scientific paper
Trans-Neptunian Objects (TNOs) display a large range of colors from just blue of solar to extremely red, which suggests variations in the surface composition of these bodies that may be due to their orbital evolution. Correlations between the orbital parameters and colors of TNOs may help identify whether the range of colors is due to compositional differences and/or resurfacing effects. We will present the correlations with color that have been reported for the trans-Neptunian objects (TNOs) and discuss the relevance of using Spearman rank correlations and similar tests to identify and interpret trends between colors and orbital parameters. Using V, R, and I photometry obtained with the WFPC2 instrument on HST, we will show that Spearman rank correlations do not exist for any combination of orbital parameter with V-I, V-R, and R-I. However, while rank correlations do not exist, trends in color similar to those observed for the B-band colors do occur.
Extensive modeling, multi-wavlength observations, and accurate determinations of the albedos of TNOs will all be required to determine if the diversity in color observed for the TNOs is due to collisional resurfacing, excessive irradiation, compositional differences, or a combination of the three. The significance of the HST results presented here will be enhanced in the future by the inclusion of near-infrared J and H magnitudes, and albedo measurements from SIRTF. When combined, this data will help identify objects with different surface compositions, and ascertain whether the gray surfaces of TNOs are due to extensive irradiation or resurfacing. We will then be able to better identify the sources responsible for the diversity of TNO colors.
This research is supported by grants to STScI: GO-9060, GO-9386
Buie Marc
Cruikshank Dale P.
Grundy Will M.
Millis Robert L.
Noll Keith S.
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