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arXiv 1802.09306astro-ph.SRastro-ph.EP
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宽双星HD 80606/80607的详细化学成分：修订的恒星性质和对行星形成的限制

Detailed chemical compositions of the wide binary HD 80606/80607: revised stellar properties and constraints on planet formation

F. Liu, D. Yong, M. Asplund, S. Feltzing, A. J. Mustill, J. Meléndez, I. Ramírez, J. Lin

备注：
11 pages, 9 figues, accepted for publication in A&A
发表信息：
A&A 614, A138 (2018)
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摘要：

双星系统中行星宿主恒星元素丰度的差异可以提供有关行星形成和演化的重要线索和限制。在这项研究中，我们进行了高精度，差分元素丰度分析的广泛的二元系统，HD 80606/80607，基于高分辨率，高信噪比凯克/HIRES光谱。HD 80606拥有一颗四木星质量的巨行星，而HD 80607周围还没有发现行星。我们以极高的精度确定了这两颗恒星的恒星参数以及23种元素的丰度。我们的主要结果是：（i）我们确认这两种成分具有非常相似的化学成分，但HD 80606比HD 80607稍微富含金属，平均差异为+0.013 $\pm$ 0.002 dex（$σ$ = 0.009 dex）和（ii）丰度差异和冷凝温度之间没有明显的趋势。假设这对双星是由具有相同化学成分的物质形成的，那么就很难理解巨型行星形成是如何产生我们测量的当今光球元素丰度的。我们不能排除HD 80606可能在其表面吸积了大约2.5到5个$M_{\rm Earth}$物质的可能性，可能来自一颗被已知的高偏心率巨星破坏的行星。

英文摘要：

Differences in the elemental abundances of planet hosting stars in binary systems can give important clues and constraints about planet formation and evolution. In this study we performed a high-precision, differential elemental abundance analysis of a wide binary system, HD 80606/80607, based on high-resolution, high signal-to-noise ratio Keck/HIRES spectra. HD 80606 is known to host a four Jupiter mass giant planet while no planet has yet been detected around HD 80607. We determined stellar parameters as well as abundances for 23 elements for these two stars with extremely high precision. Our main results are: (i) we confirmed that the two components share very similar chemical compositions, but HD 80606 is marginally more metal-rich than HD 80607 with an average difference of +0.013 $\pm$ 0.002 dex ($σ$ = 0.009 dex) and (ii) there is no obvious trend between abundance differences and condensation temperature. Assuming this binary formed from material with the same chemical composition, it is difficult to understand how giant planet formation could produce the present-day photospheric abundances of the elements we measure. We can not exclude the possibility that HD 80606 might have accreted about 2.5 to 5 $M_{\rm Earth}$ material onto its surface, possibly from a planet destabilised by the known highly-eccentric giant.

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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