Using the Sun to estimate Earth-like planets detection capabilities. V. Parameterizing the impact of solar activity components on radial velocities
Using the Sun to estimate Earth-like planets detection capabilities. V. Parameterizing the impact of solar activity components on radial velocities
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利用太阳来估计类地行星的探测能力。
DOI：
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
A. Lagrange
中科院分区：
文献类型：
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作者：
S. Borgniet;N. Meunier;A. Lagrange
已知由活动结构（例如，斑点、光斑）引起的恒星活动强烈影响径向速度时间序列。然后，它限制了对小行星RV信号的探测（例如，在类太阳星星的可居住区中的地球质量的行星）。在以前的论文中，我们研究了这样的行星的可探测性，太阳周围被视为一个边缘上的星星。为此，我们计算了RV和光度变化引起的太阳磁活动，使用所有的活动结构观察到一个完整的周期。我们的目标是对具有不同物理和几何性质的恒星进行类似的研究。作为第一步，我们专注于太阳一样的恒星看到各种倾向，并估计检测能力与即将到来的仪器。为此，我们首先参数化的太阳活动结构与最现实的模式，以获得与观测结果一致。利用太阳观测资料和文献资料中的参数和经验规律，模拟了太阳黑子、光斑和网络的生长、演化和衰减。我们在一个完整的太阳活动周期内生成相应的结构列表。然后，我们建立由此产生的光谱，并推导出RV和光度变化的“太阳”看到各种倾角。所产生的RV信号考虑到结构的光度贡献以及对流蓝移的衰减。我们的模拟活动模式和观察到的一个之间的比较验证了我们的模型。我们表明，恒星自转轴的倾斜度对时间序列有显着的影响。RV长期振幅以及短期抖动显着降低时，从边缘上的极点配置。假设自旋轨道对齐，行星探测的最佳配置是倾斜的星星（i~45{\deg}）。
Stellar activity induced by active structures (eg, spots, faculae) is known to strongly impact the radial velocity time series. It then limits the detection of small planetary RV signals (eg, an Earth-mass planet in the habitable zone of a solar-like star). In previous papers, we studied the detectability of such planets around the Sun seen as an edge-on star. For that purpose, we computed the RV and photometric variations induced by solar magnetic activity, using all active structures observed over one entire cycle. Our goal is to perform similar studies on stars with different physical and geometrical properties. As a first step, we focus on Sun-like stars seen with various inclinations, and on estimating detection capabilities with forthcoming instruments. To do so, we first parameterize the solar active structures with the most realistic pattern so as to obtain results consistent with the observed ones. We simulate the growth, evolution and decay of solar spots, faculae and network, using parameters and empiric laws derived from solar observations and literature. We generate the corresponding structure lists over a full solar cycle. We then build the resulting spectra and deduce the RV and photometric variations for a `Sun' seen with various inclinations. The produced RV signal takes into account the photometric contribution of structures as well as the attenuation of the convective blueshift. The comparison between our simulated activity pattern and the observed one validates our model. We show that the inclination of the stellar rotation axis has a significant impact on the time series. RV long-term amplitudes as well as short-term jitters are significantly reduced when going from edge-on to pole-on configurations. Assuming spin-orbit alignment, the optimal configuration for planet detection is an inclined star (i~45{\deg}).
是否有可能探测到年轻活跃的 G 矮星和 K 矮星周围的行星
影响因子：
4.8
作者：
Jeffers;Barnes;H. R. A
通讯作者：
H. R. A