在K波段对大质量YSO进行的首次干涉测量。Au尺度下的热尘埃、电离气体和双星
The first interferometric survey in the K-band of massive YSOs. On the hot dust, ionised gas, and binarity at au scales
摘要：
星周盘对于高质量恒星的形成是必不可少的，而多重性，特别是双星，似乎是一个不可避免的结果，因为绝大多数的大质量恒星（> 8 Msun）都是在双星中发现的（高达100%）。我们约束的尘埃和电离气体（Brgamma）的排放量的最里面的区域对一个样本的6个MYSO的大小，并提供高质量的二进制统计的年轻恒星在2-300 AU尺度使用VLTI（重力，琥珀色）的观测。我们确定的尘埃排放的内半径和地方MYSO与K-波段测量的大小-光度图的第一次，并比较我们的研究结果T金牛座和赫比格AeBes。我们还比较了所观察到的K-波段的大小，由三个不同的光盘的情况下预测的升华半径。最后，我们应用二进制几何跟踪密切的二进制MYSO。MYSO、Herbig AeBe和T Tauri恒星的内部大小似乎遵循一个普遍的趋势，即大小与恒星光度的平方根成比例。与2.2 μm连续谱发射相比，Br γ发射源自更小的共面区域。我们讨论了这一新的发现盘风或喷流的起源。最后，我们报告的MYSO二进制分数为17-25%，毫角秒的分离（2-300 AU）。大小-光度图表明，年轻恒星周围圆盘的内部区域与光度成比例，与恒星质量无关。在目标尺度（2-300 au），MYSO双星的比例低于先前报道的更演化的主序星大质量恒星，如果进一步证实，可能涉及大质量双星形成理论的预测。最后，我们在空间上解决了关键的星/盘接口的MYSO样本，显示金尺度光盘是突出的高质量恒星形成和类似的低质量的等价物。
英文摘要：
Circumstellar discs are essential for high mass star formation, while multiplicity, in particular binarity, appears to be an inevitable outcome since the vast majority of massive stars (> 8 Msun) are found in binaries (up to 100%). We constrain the sizes of the dust and ionised gas (Brgamma) emission of the innermost regions towards a sample of six MYSOs, and provide high-mass binary statistics of young stars at 2-300 au scales using VLTI (GRAVITY, AMBER) observations. We determine the inner radius of the dust emission and place MYSOs with K-band measurements in a size-luminosity diagram for the first time, and compare our findings to T Tauris and Herbig AeBes. We also compare the observed K-band sizes to the sublimation radius predicted by three different disc scenarios. Lastly, we apply binary geometries to trace close binarity among MYSOs. The inner sizes of MYSOs, Herbig AeBe and T Tauri stars appear to follow a universal trend at which the sizes scale with the square-root of the stellar luminosity. The Brgamma emission originates from somewhat smaller and co-planar area compared to the 2.2 μm continuum emission. We discuss this new finding with respect to disc-wind or jet origin. Finally, we report an MYSO binary fraction of 17-25% at milli-arcsecond separations (2-300 au). The size-luminosity diagram indicates that the inner regions of discs around young stars scale with luminosity independently of the stellar mass. At the targeted scales (2-300 au), the MYSO binary fraction is lower than what was previously reported for the more evolved main sequence massive stars, which, if further confirmed, could implicate the predictions from massive binary formation theories. Lastly, we spatially resolve the crucial star/disc interface in a sample of MYSOs, showing that au-scale discs are prominent in high-mass star formation and similar to their low-mass equivalents.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
