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arXiv 2505.08042astro-ph.SRastro-ph.EP
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GJ 105 AC的三维轨道与动力学质量

Three-dimensional Orbit and Dynamical Masses of GJ 105 AC

Cayla M. Dedrick, Jason T. Wright, Jason D. Eastman, Cullen H. Blake, Samson A. Johnson, Peter Plavchan, John Asher Johnson, David H. Sliski, Maurice L. Wilson,… 展开作者

Cayla M. Dedrick, Jason T. Wright, Jason D. Eastman, Cullen H. Blake, Samson A. Johnson, Peter Plavchan, John Asher Johnson, David H. Sliski, Maurice L. Wilson, Robert A. Wittenmyer, Thomas Barclay, Jonathan Horner, Stephen R. Kane, Sharon X. Wang

AI总结:

本研究利用MINERVA新视向速度与天体测量数据,重新测定长周期双星GJ 105 AC的三维轨道和两颗子星的精确动力学质量,并确认其为接近单星演化条件的理想光谱基准。

摘要:

恒星模型的精度高于我们能够测量大多数恒星质量的精度,双星系统是显著的例外,因为在双星中我们可以测定各组成恒星的动力学质量。除了恒星性质得到良好测量之外,理想的基准恒星还应与其伴星相距足够远,使其性质与在其他方面完全相同的单星无法区分。目前,只有少数恒星拥有精确(±3%)、不依赖模型的质量测量,并且是“有效单星”,同时我们还能获得其干净光谱(即未与近距伴星混合的光谱)。在本文中,我们介绍GJ 105 AC为这一排他性群体的最新成员。我们给出了对长周期K3+M7双星GJ 105 AC的更新轨道分析。我们联合分析了视向速度(RV)和相对天体测量数据,包括来自Miniature Exoplanet Radial Velocity Array(MINERVA)的新RV数据;这些数据首次捕捉到了76.0 ± 1.3年轨道的完整近心点通过过程以及RV极小值。我们推导出精确的动力学质量:M_1 = 0.78 ± 0.02 M_⊙,M_2 = 0.098 ± 0.002 M_⊙。我们发现,在所有具有相近精度质量(约2%)的恒星中,GJ 105 AC因其仅次于α Centauri AB的最大天球间距而突出,这使其成为最容易进行光谱观测的系统之一;同时它还具有第二大的真实间距,确保其成员在演化方面确实是“有效单星”。

英文摘要:

The precision of stellar models is higher than the precision at which we are able to measure the masses of most stars, with the notable exception of binaries where we can determine dynamical masses of the component stars. In addition to well-measured stellar properties, the ideal benchmark star is far enough from its companion that its properties are indistinguishable from an otherwise identical single star. Currently, there are a handful of stars with precise ($\pm$3 %), model-independent mass measurements that are "effectively single" and for which we can obtain clean spectra (i.e. spectra that are not blended with a close companion). In this paper, we introduce GJ 105 AC as the newest members of this exclusive population. We present an updated orbital analysis for the long-period K3+M7 binary GJ 105 AC. We jointly analyze radial velocity (RV) and relative astrometry data, including new RVs from the Miniature Exoplanet Radial Velocity Array (MINERVA) that capture the full periapsis passage and the RV minimum of the $76.0 \pm 1.3$ yr orbit for the first time. We derive precise dynamical masses of $M_1 = 0.78 \pm 0.02\, \mathrm{M}_\odot$ and $M_2 = 0.098 \pm 0.002\, \mathrm{M}_\odot$. We find that of all stars with similarly precise masses (~2%), GJ 105 AC stands out as having the widest on-sky separation after $α$ Centauri AB, making it one of the most easily accessible to spectroscopy, as well as the the second-widest true separation, ensuring that its members are truly "effectively single" in terms of their evolution.

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。

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