THE PROPOSED GIANT PLANET ORBITING VB 10 DOES NOT EXIST

THE PROPOSED GIANT PLANET ORBITING VB 10 DOES NOT EXIST
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拟议的绕 VB 10 运行的巨行星并不存在

DOI:
10.1088/2041-8205/711/1/l19
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发表时间:
2010
期刊:
The Astrophysical Journal Letters
影响因子:
--
通讯作者:
Günter
Günter
中科院分区:
--
文献类型:
--
作者:
Jacob L;Seifahrt;Andreas;Hartman;Henrik;Nilsson;Hampus;Reiners;Ansgar;Dreizler;Stefan;Todd J;Wiedemann;Günter

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我们提出了高精度的相对径向速度的非常低的质量星星VB 10,获得了超过0.61年的时间跨度的一部分,正在进行的搜索恒星周围的行星在年底的主要序列。径向速度是从高分辨率的近红外光谱,使用甚大望远镜上的CRIRES仪器与氨气细胞获得的测量。测量的典型内部精度为10 m s− 1。这些数据没有表现出显著的可变性,并且基本上恒定在与测量不确定性一致的水平上。因此,我们没有检测到VB 10的径向速度变化,预计由于存在一个类似于最近提出的Pravdo和Shaklan基于明显的天体测量扰动的轨道巨行星。此外,我们没有证实Zapatero Osorio及其同事用较低精度的测量方法初步探测到的星星的径向速度变化率为0.1 km s− 1。我们的测量排除了Mp> 3 M Jup的行星,以及Pravdo和Shaklan建议的轨道周期和倾角优于5σ置信度。我们的结论是,行星探测声称Pravdo和Shaklan是虚假的基础上,这一结果。虽然这项工作的结果是一个非检测,它说明了使用氨细胞径向速度检测非常低质量恒星周围的行星的潜力。
We present high-precision relative radial velocities of the very low mass star VB 10 that were obtained over a time span of 0.61 years as part of an ongoing search for planets around stars at the end of the main sequence. The radial velocities were measured from high-resolution near-infrared spectra obtained using the CRIRES instrument on the Very Large Telescope with an ammonia gas cell. The typical internal precision of the measurements is 10 m s− 1. These data do not exhibit significant variability and are essentially constant at a level consistent with the measurement uncertainties. Therefore, we do not detect the radial velocity variations of VB 10 expected due to the presence of an orbiting giant planet similar to that recently proposed by Pravdo & Shaklan based on apparent astrometric perturbations. In addition, we do not confirm the∼ 1 km s− 1 radial velocity variability of the star tentatively detected by Zapatero Osorio and colleagues with lower precision measurements. Our measurements rule out planets with M p> 3 M Jup and the orbital period and inclination suggested by Pravdo & Shaklan at better than 5σ confidence. We conclude that the planet detection claimed by Pravdo & Shaklan is spurious on the basis of this result. Although the outcome of this work is a non-detection, it illustrates the potential of using ammonia cell radial velocities to detect planets around very low mass stars.
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