The GAPS programme with HARPS-N at TNG - VII. Putting exoplanets in the stellar context: magnetic activity and asteroseismology of τ Bootis A
The GAPS programme with HARPS-N at TNG - VII. Putting exoplanets in the stellar context: magnetic activity and asteroseismology of τ Bootis A
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TNG 与 HARPS-N 的 GAPS 计划 - VII 将系外行星置于恒星环境中：τ Bootis A 的磁活动和星震学。
DOI：
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
B. Stelzer
中科院分区：
文献类型：
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作者：
F. Borsa;G. Scandariato;M. Rainer;A. Bignamini;A. Maggio;E. Poretti;A. Lanza;M. D. Mauro;S. Benatti;K. Biazzo;A. Bonomo;M. Damasso;Massimiliano Esposito;Massimiliano Esposito;R. Gratton;L. Affer;M. Barbieri;C. Boccato;R. Claudi;R. Cosentino;E. Covino;S. Desidera;A. Fiorenzano;D. Gandolfi;D. Gandolfi;A. Harutyunyan;J. Maldonado;G. Micela;P. Molaro;E. Molinari;I. Pagano;I. Pillitteri;I. Pillitteri;G. Piotto;G. Piotto;E. Shkolnik;R. Silvotti;R. Smareglia;J. Southworth;A. Sozzetti;B. Stelzer
目标。我们用HARPS-N光谱仪观测τ Boo系统，以测试一种新的观测策略，旨在联合研究星震学，行星轨道和恒星-行星磁相互作用。方法.我们几乎连续收集了11个晚上的高步频观测数据，并使用专用软件对每个晚上的原始FITS文件进行平均。以这种方式，我们获得了光谱具有高的信噪比，用于研究的变化的Ca II H&K线，并有径向速度值从恒星振荡，而不会丢失的振荡信息。我们开发了一个专用软件来构建一个新的自定义掩模，我们使用该掩模来改进HARPS-N管道的径向速度测定并执行光谱分析。结果我们更新了行星星历表，并显示了恒星双星伴星引起的加速度。我们对恒星活动变化的研究结果表明，在我们的观测时间跨度内存在高纬度谱斑。色球活动与行星轨道相位之间的相关性仍然不清楚。在径向速度时间序列中检测到类似太阳的振荡：我们估计了星震量，发现它们与理论预测吻合得很好。我们的恒星模型得出的年龄为0.9 ± 0。5G yr，进一步将恒星质量限制在1.38 ± 0.05 M�。
Aims. We observed the τ Boo system with the HARPS-N spectrograph to test a new observational strategy aimed at jointly studying asteroseismology, the planetary orbit, and star-planet magnetic interaction. Methods. We collected high-cadence observations on 11 nearly consecutive nights and for each night averaged the raw FITS files using a dedicated software. In this way we obtained spectra with a high signal-to-noise ratio, used to study the variation of the Ca ii H&K lines and to have radial velocity values free from stellar oscillations, without losing the oscillations information. We developed a dedicated software to build a new custom mask that we used to refine the radial velocity determination with the HARPS-N pipeline and perform the spectroscopic analysis. Results. We updated the planetary ephemeris and showed the acceleration caused by the stellar binary companion. Our results on the stellar activity variation suggest the presence of a high-latitude plage during the time span of our observations. The correlation between the chromospheric activity and the planetary orbital phase remains unclear. Solar-like oscillations are detected in the radial velocity time series: we estimated asteroseismic quantities and found that they agree well with theoretical predictions. Our stellar model yields an age of 0.9 ± 0. 5G yr forτ Boo and further constrains the value of the stellar mass to 1.38 ± 0.05 M� .
DOI：
10.1111/j.1365-2966.2009.14694.x
发表时间：
2009
影响因子：
4.8
作者：
Barker A
通讯作者：
Barker A