论文标题
使用ALMA解决HD 38206的外环，并限制系统中行星的限制
Resolving the outer ring of HD 38206 using ALMA and constraining limits on planets in the system
论文作者
论文摘要
HD 38206是哥伦比亚协会的A0V星，拥有IRAS最初发现的碎片盘。 Spitzer和Herschel的进一步观察表明，该光盘具有两个组成部分，可能类似于太阳系的小行星和Kuiper带。这颗恒星的年轻时代使其成为直接成像行星搜索的主要目标。系统中可能的行星可以使用碎屑盘约束。在这里，我们介绍了系统的Kuiper带的第一个Alma观察结果，并使用向前建模MCMC方法安装它们。我们检测到一个伸展的灰尘圆盘，在约180 au左右，宽度为140 au。该光盘接近边缘，并显示出最佳拟合的暂定迹象，偏心度为$ 0.25^{+0.10} _ { - 0.09} $。我们使用拟合参数来确定沿着冷带内部行星质量的限制。我们确定至少需要四个行星，每个行星的最低质量为0.64 m $ _J $，以清除系统的小行星和kuiper带之间的缝隙。如果我们假设最外面的行星负责碟片的搅拌，其内部边缘的位置和光盘的偏心性，那么我们可以更紧密地预测其偏心，质量和半轴轴为$ e _ {\ rm {p}} = 0.34^{+0.34^{+0.20} {+0.20} {+0.20} {+0.20} _ {-0.13}美元
HD 38206 is an A0V star in the Columba association, hosting a debris disc first discovered by IRAS. Further observations by Spitzer and Herschel showed that the disc has two components, likely analogous to the asteroid and Kuiper belts of the Solar System. The young age of this star makes it a prime target for direct imaging planet searches. Possible planets in the system can be constrained using the debris disc. Here we present the first ALMA observations of the system's Kuiper belt and fit them using a forward modelling MCMC approach. We detect an extended disc of dust peaking at around 180 au with a width of 140 au. The disc is close to edge on and shows tentative signs of an asymmetry best fit by an eccentricity of $0.25^{+0.10}_{-0.09}$. We use the fitted parameters to determine limits on the masses of planets interior to the cold belt. We determine that a minimum of four planets are required, each with a minimum mass of 0.64 M$_J$, in order to clear the gap between the asteroid and Kuiper belts of the system. If we make the assumption that the outermost planet is responsible for the stirring of the disc, the location of its inner edge and the eccentricity of the disc, then we can more tightly predict its eccentricity, mass and semimajor axis to be $e_{\rm{p}}=0.34^{+0.20}_{-0.13}$, $m_{\rm{p}}=0.7^{+0.5}_{-0.3}\,\rm{M}_{\rm{J}}$ and $a_{\rm{p}}=76^{+12}_{-13}\,\rm{au}$.
