NICMOS Photometry of the Unusual Dwarf Planet Haumea and its Satellites
We present here Hubble Space Telescope NICMOS F110W and F160W observations of Haumea, and its two satellites Hi'iaka and Namaka. From the measured (F110W-F160W) colors of –1.208 ± 0.004, –1.48 ± 0.06, and –1.4 ± 0.2 mag for each object, respectively, we infer that the 1.6 μm water-ice absorption feature depths on Hi'iaka and Namaka are at least as deep as that of Haumea. The light curve of Haumea is detected in both filters, and we find that the infrared color is bluer by ~2%-3% at the phase of the red spot. These observations suggest that the satellites of Haumea were formed from the collision that produced the Haumea collisional family.
Additional Information©2009. The American Astronomical Society. Received 2008 December 19; accepted 2009 March 2; published 2009 March 18. The authors thank Dr Emily Schaller, and Darin Ragozzine for their very useful discussions of, and suggestions for this project. This material is based upon the work supported by NASA under the grant NNG05GI02G. Support for program HST-GO-011169.9-A was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.
Published - Fraser2009p1376Astrophys_J_Lett.pdf
Accepted Version - 0903.0860.pdf