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arXiv 1408.1402astro-ph.SRastro-ph.IM
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系外行星凌日期间的恒星光谱学:剖析恒星表面的精细结构

Stellar Spectroscopy during Exoplanet Transits: Dissecting fine structure across stellar surfaces

Dainis Dravins, Hans-Günter Ludwig, Erik Dahlén, Hiva Pazira

摘要:

在系外行星凌日期间的差分光谱允许重建小恒星表面部分的光谱,这些部分相继隐藏在行星后面。恒星线形、不对称性和波长偏移的中心到边缘的行为将使恒星大气的三维流体动力学模型的详细测试成为可能,这是精确确定丰度或地震特性所必需的。这样的模型现在可以计算广泛不同的恒星,但已经可行的详细测试,只有太阳与其解决的表面结构。虽然非常高质量的光谱是必需的,目前的数据已经允许重建线轮廓在最明亮的过境宿主星,如HD 209458(G0 V)。

英文摘要:

Differential spectroscopy during exoplanet transits permits to reconstruct spectra of small stellar surface portions that successively become hidden behind the planet. The center-to-limb behavior of stellar line shapes, asymmetries and wavelength shifts will enable detailed tests of 3-dimensional hydrodynamic models of stellar atmospheres, such that are required for any precise determination of abundances or seismic properties. Such models can now be computed for widely different stars but have been feasible to test in detail only for the Sun with its resolved surface structure. Although very high quality spectra are required, already current data permit reconstructions of line profiles in the brightest transit host stars such as HD209458 (G0 V).

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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