论文标题
通过三轴小行星的旋转裂变来限制ZTF J0139+5245周围的行星碎片的起源
Constraining the origin of the planetary debris surrounding ZTF J0139+5245 through rotational fission of a triaxial asteroid
论文作者
论文摘要
包含轨道行星或其碎屑的白色矮人代表了至关重要的基准，可以通过这些基准进行理论研究后序列的行星系统的理论研究。 ZTF J0139+5245白色矮人系统中可能行星碎片的光度传输特征的轨道周期约为110天。分解以产生这种碎片的小行星可能会通过反复与恒星的近距离相遇而无需进入Roche Radius，并且没有白色矮人的亮度影响。在这里，我们对轨道上心（$ q $）和三轴小行星的中间与最长半肌的比率（$β$）放置了耦合约束，该比率（$β$）在达到110-day或Bitit后不久，该小星体的Roche radius（$ r _ {\ rm rm roch} $）都在此范围内扰乱了这一白矮人的Roche radius（$ r _ {\ rm rm roch} $）。我们发现，当$β\ Lessim 0.6 $和$ Q \ $ q \ y 1.0-2.0r _ {\ rm roche} $以及$β\ lyssim 0.2 $ to $ q \ $ q \ 2.5r _ {\ rm roche} $时，可能会在数十年之内进行干扰。希望分析ZTF J0139+5245周围三轴小行星的更长尺度破坏是可取的，但可能需要依靠千古理论或新颖的数值技术的分析方法。
White dwarfs containing orbiting planetesimals or their debris represent crucial benchmarks by which theoretical investigations of post-main-sequence planetary systems may be calibrated. The photometric transit signatures of likely planetary debris in the ZTF J0139+5245 white dwarf system has an orbital period of about 110 days. An asteroid which breaks up to produce this debris may spin itself to destruction through repeated close encounters with the star without entering its Roche radius and without influence from the white dwarf's luminosity. Here, we place coupled constraints on the orbital pericentre ($q$) and the ratio ($β$) of the middle to longest semiaxes of a triaxial asteroid which disrupts outside of this white dwarf's Roche radius ($r_{\rm Roche}$) soon after attaining its 110-day orbit. We find that disruption within tens of years is likely when $β\lesssim 0.6$ and $q\approx 1.0-2.0r_{\rm Roche}$, and when $β\lesssim 0.2$ out to $q\approx 2.5r_{\rm Roche}$. Analysing the longer-timescale disruption of triaxial asteroids around ZTF J0139+5245 is desirable but may require either an analytical approach relying on ergodic theory or novel numerical techniques.
