Star–planet–debris disc alignment in the HD 82943 system: is planetary system coplanarity actually the norm?
Star–planet–debris disc alignment in the HD 82943 system: is planetary system coplanarity actually the norm?
复制标题
HD 82943 系统中的恒星-行星-碎片盘排列：行星系统共面性实际上是常态吗？
DOI：
10.1093/mnras/stt1657
复制
发表时间：
2013
影响因子：
4.8
通讯作者：
B. Sibthorpe
中科院分区：
文献类型：
--
作者：
Grant M. Kennedy;M. Wyatt;G. Bryden;R. Wittenmyer;B. Sibthorpe
最近的结果表明，HD 82943系统中的两颗行星与天平面的夹角为20 ± 4°。在这里，我们发现这个系统中的碎片盘倾斜了27 ± 4°，从而增加了导出的行星倾斜度的强度，并表明行星和碎片盘一致地排列在类似于太阳系的水平上。此外，恒星赤道被推断为倾斜28 ± 4°，这表明整个恒星-行星-盘系统是对齐的，这是第一次在~Au宽的轨道上对径向速度发现的行星进行测试。我们表明，行星盘对齐是原始的，而不是行星长期扰动的光盘倾角的结果。此外，我们注意到其他三个系统的行星在1000 Au发现的直接成像，已经有很好的证据的对齐，并建议，经验证据的系统范围内的恒星行星盘对齐因此出现，与主机热彗星的系统除外。虽然这种排列需要在更多的系统中进行测试，也许并不令人惊讶，但它提醒人们，在考虑行星轨道的方向时，应该将系统作为一个整体来考虑。
Recent results suggest that the two planets in the HD 82943 system are inclined to the sky plane by 20 ± 4°. Here, we show that the debris disc in this system is inclined by 27 ± 4°, thus adding strength to the derived planet inclinations and suggesting that the planets and debris disc are consistent with being aligned at a level similar to the Solar system. Further, the stellar equator is inferred to be inclined by 28 ± 4°, suggesting that the entire star-planet-disc system is aligned, the first time such alignment has been tested for radial velocity discovered planets on ~au wide orbits. We show that the planet-disc alignment is primordial, and not the result of planetary secular perturbations to the disc inclination. In addition, we note three other systems with planets at ≳10 au discovered by direct imaging that already have good evidence of alignment, and suggest that empirical evidence of system-wide star-planet-disc alignment is therefore emerging, with the exception of systems that host hot Jupiters. While this alignment needs to be tested in a larger number of systems, and is perhaps unsurprising, it is a reminder that the system should be considered as a whole when considering the orientation of planetary orbits.