论文标题
arokoth的近表面温度模型
A Near Surface Temperature Model of Arrokoth
论文作者
论文摘要
基于最近发布的$ 10^5 $方面模型，开发了ARROKOTH的近表面热模型。该热溶液考虑了Arrokoth的表面重新放置回到自身。该解决方案方法利用了Arrokoth的周期性轨道特性，使用时间激素溶液方法进行热响应，该方法涉及热方程的傅立叶变换溶液，这是其他人最近使用的方法。我们将显示详细的热解决方案，假设Arrokoth的近地面材料的热惯性$ {\ cal i} = $ 2.5 w/m $^{ - 2} $ k $^{ - 1} $ s $ s $^{1/2} $。我们预测，在New Horizons与Arrokoth的相遇时，其相遇的半球表面温度为$ \ sim $ 57-59 K，其赤道区域为30-40 K，其冬季半球为11-13 K。 ARROKOTH的轨道平均温度约为其极性区域的30-35 K，近距离赤道区域接近40 K。从周围表面的热辐射量不到总能量预算的5％，而在一个轨道上通过热传导将Arrokoth内部挖出的总能量约为总能量预算的0.5％。作为这种热建模的广义应用以及其他KBO起源考虑因素，我们赞成这样的解释：New Horizons的Rex仪器的$ 29 \ pm 5 $ k亮度温度测量与Arrokoth的近表面材料是由近距离的MM大小的Tholin涂层的1.1的tholin coperation coperations i clocoth的表面材料一致。 w/m $^{ - 2} $ k $^{ - 1} $ s $^{1/2} $ $ <{\ cal i} <$ 10-20 w/m $^{ - 2} $ k $^{ - 1} $ s $ s $ s $ s $^{1/2} $，以及由X-Band emissivity n.9 and and and and and and and and and and 1.9和1.9。
A near surface thermal model for Arrokoth is developed based on the recently released $10^5$ facet model of the body. This thermal solution takes into account Arrokoth's surface re-radiation back onto itself. The solution method exploits Arrokoth's periodic orbital character to develop a thermal response using a time-asymptotic solution method, which involves a Fourier transform solution of the heat equation, an approach recently used by others. We display detailed thermal solutions assuming that Arrokoth's near surface material's thermal inertia ${\cal I} = $ 2.5 W/m$^{-2}$K$^{-1}$s$^{1/2}$. We predict that at New Horizons' encounter with Arrokoth its encounter hemisphere surface temperatures were $\sim$ 57-59 K in its polar regions, 30-40 K on its equatorial zones, and 11-13 K for its winter hemisphere. Arrokoth's orbitally averaged temperatures are around 30-35 K in its polar regions, and closer to 40 K near its equatorial zones. Thermal reradiation from the surrounding surface amounts to less than 5\% of the total energy budget, while the total energy ensconced into and exhumed out Arrokoth's interior via thermal conduction over one orbit is about 0.5\% of the total energy budget. As a generalized application of this thermal modeling together with other KBO origins considerations, we favor the interpretation that New Horizons' REX instrument's $29 \pm 5$K brightness temperature measurement is consistent with Arrokoth's near surface material's being made of sub-to-few mm sized tholin-coated amorphous \water ice grains with 1 W/m$^{-2}$K$^{-1}$s$^{1/2}$ $< {\cal I} < $10-20 W/m$^{-2}$K$^{-1}$s$^{1/2}$, and which are characterized by an X-band emissivity in the range 0.9 and 1.
