论文标题
AM恒星和热杂音行星与行星有关吗？
Are Am stars and hot-Jupiter planets related?
论文作者
论文摘要
AM恒星通常是短期二元系统的组成部分，在这种组件中，潮汐相互作用会导致低旋转速度，并有助于发展观察到的化学特征。但是，属于宽二元系统的单个AM恒星和AM恒星的起源尚不清楚。最近有一个证据表明，AM恒星容纳热棕色矮人，可能同步和其他可能的AM恒星托管热jupiter行星。我们想知道这些热低的群众同伴是否可以在AM星的发展中发挥作用，也就是说，他们是否可以帮助缓解“单一AM”问题。我们研究了19个早期型星的样本，其中7个托管热矮人和其中12个托管热杂志的行星。我们在样品（Kelt-19a，Kelt-17，Hats-70和Toi-503）和2个可能的AM恒星（TOI-681和HAT-P-69）中检测到了4点恒星。特别是，我们检测到新的AM STAR HATS-70，它载有热棕色矮人，并排除了Hot-Jupiter主机WASP-189的类别，两者均显示出与以前报道的不同的组成。我们估计，恒星中AM恒星的发生率是托管热矮人（50-75％）的恒星和托管恒星内的恒星发病率（20-42％）。托有热棕色矮人的AM恒星的发生率总体上高于AM恒星的频率。这意味着，热棕色矮人的存在可能在AM恒星的发展中发挥作用，并可能有助于减轻与热jupiter行星不同的“单一AM”问题。值得注意的是，这些结果还表明，瞄准宽二元系统中的单个AM或AM恒星，寻找热棕色矮人可能会受益。我们鼓励分析额外的早期型恒星，这些恒星容纳热贡献，以提高此处发现的初始趋势的重要性。 [简略]
Am stars are often components of short-period binary systems, where tidal interactions would result in low rotational velocities and help to develop the chemical peculiarities observed. However, the origin of single Am stars and Am stars that belong to wide binary systems is unclear. There is very recent evidence of an Am star hosting a hot-brown dwarf likely synchronized and other possible Am stars hosting hot-Jupiter planets. We wonder if these hot-low mass companions could play a role in the development of an Am star, that is to say, if they could help to mitigate the "single Am" problem. We studied a sample of 19 early-type stars, 7 of them hosting hot-brown dwarfs and 12 of them hosting hot-Jupiter planets. We detected 4 Am stars in our sample (KELT-19A, KELT-17, HATS-70 and TOI-503) and 2 possible Am stars (TOI-681 and HAT-P-69). In particular, we detected the new Am star HATS-70 which hosts a hot-brown dwarf, and rule out this class for the hot-Jupiter host WASP-189, both showing different composition than previously reported. We estimated the incidence of Am stars within stars hosting hot-brown dwarfs (50-75%) and within stars hosting hot-Jupiters (20-42%). The incidence of Am stars hosting hot-brown dwarfs resulted higher than the frequency of Am stars in general. This would imply that the presence of hot-brown dwarfs could play a role in the development of Am stars and possibly help to mitigate the "single Am" problem, different to the case of hot-Jupiter planets. Notably, these results would also indicate that the search for hot-brown dwarfs may be benefited by targeting single Am stars or Am stars in wide binary systems. We encourage the analysis off additional early-type stars hosting hot-companions in order to improve the significance of the initial trends found here. [abridged]
