The Mass, Orbit, and Tidal Evolution of the Quaoar-Weywot System

Abstract

Here we present new adaptive optics observations of the Quaoar-Weywot system. With these new observations we determine an improved system orbit. Due to a 0.39 day alias that exists in available observations, four possible orbital solutions are available with periods of $\sim 11.6$, $\sim 12.0$, $\sim 12.4$, and $\sim 12.8$ days. From the possible orbital solutions, system masses of $1.3-1.5\pm 0.1\times 10^{21}$ kg are found. These observations provide an updated density for Quaoar of $2.7-5.0{g cm$^{-3}$}$. In all cases, Weywot's orbit is eccentric, with possible values $\sim 0.13-0.16$. We present a reanalysis of the tidal orbital evolution of the Quoaor-Weywot system. We have found that Weywot has probably evolved to a state of synchronous rotation, and have likely preserved their initial inclinations over the age of the Solar system. We find that for plausible values of the effective tidal dissipation factor tides produce a very slow evolution of Weywot's eccentricity and semi-major axis. Accordingly, it appears that Weywot's eccentricity likely did not tidally evolve to its current value from an initially circular orbit. Rather, it seems that some other mechanism has raised its eccentricity post-formation, or Weywot formed with a non-negligible eccentricity.

Accepted to Icarus, Nov. 8 2012

References in corpus (6)

• Detection of methane on Kuiper Belt Object (50000) Quaoar
• The Luminosity Function of the Hot and Cold Kuiper belt Populations
• High Precision Photometry of Extreme KBO 2003 EL61
• Water Ice on the Satellite of Kuiper Belt Object 2003 EL61
• NICMOS Photometry of the Unusual Dwarf Planet Haumea and its Satellites
• Tentative Detection of the Rotation of Eris

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