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arXiv 1402.4456astro-ph.EP
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椭圆形矮行星妊神星的大小和形状

The size and shape of the oblong dwarf planet Haumea

Alexandra C. Lockwood, Michael E. Brown, John Stansberry

摘要:

我们使用热辐射测量和可见光光度测量来限制大型柯伊伯带天体Haumea的大小,形状和亮度。可见光光度和热光度之间的相关性表明,妊神星的高振幅和快速变化的光学光变曲线确实是由于妊神星的极端形状,而不是大规模的连续变化。然而,良好的采样高精度的可见光数据,我们目前确实需要纵向表面的异质性,占的形状的光变曲线。妊神星的热辐射与流体静力平衡下快速旋转物体的预期雅可比椭球形状一致。与可见光光度学拟合最好的雅可比椭球意味着一个三轴椭球,其轴长为1920 x 1540 x 990 km,密度为2.6 g cm^-3$,这是Lellouch等人(2010)发现的。虽然热和可见光数据不能唯一地限制妊神星的完整非球形形状,但密集的雅可比椭球体的预测和测量热通量之间的匹配表明,妊神星确实是柯伊伯带中的致密天体之一。

英文摘要:

We use thermal radiometry and visible photometry to constrain the size, shape, and albedo of the large Kuiper belt object Haumea. The correlation between the visible and thermal photometry demonstrates that Haumea's high amplitude and quickly varying optical light curve is indeed due to Haumea's extreme shape, rather than large scale albedo variations. However, the well-sampled high precision visible data we present does require longitudinal surface heterogeneity to account for the shape of lightcurve. The thermal emission from Haumea is consistent with the expected Jacobi ellipsoid shape of a rapidly rotating body in hydrostatic equilibrium. The best Jacobi ellipsoid fit to the visible photometry implies a triaxial ellipsoid with axes of length 1920 x 1540 x 990 km and density 2.6 g cm^-3$, as found by Lellouch et al(2010). While the thermal and visible data cannot uniquely constrain the full non-spherical shape of Haumea, the match between the predicted and measured thermal flux for a dense Jacobi ellipsoid suggests that Haumea is indeed one of the densest objects in the Kuiper belt.

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