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The homogeneous characterisation of Ariel host stars
Experimental Astronomy ( IF 3 ) Pub Date : 2021-07-13 , DOI: 10.1007/s10686-021-09765-1
Camilla Danielski 1, 2 , Anna Brucalassi 3 , Serena Benatti 4 , Tiago Campante 5, 6 , Elisa Delgado-Mena 5 , Monica Rainer 3 , Germano Sacco 3 , Vardan Adibekyan 5, 6 , Katia Biazzo 7 , Diego Bossini 5 , Giovanni Bruno 8 , Giada Casali 3, 9 , Petr Kabath 10 , Laura Magrini 3 , Giusi Micela 4 , Giuseppe Morello 11 , Pietro Palladino 12 , Nicoletta Sanna 3 , Subhajit Sarkar 13 , Sérgio Sousa 5 , Maria Tsantaki 3 , Diego Turrini 14, 15 , Mathieu Van der Swaelmen 3
Affiliation  

The Ariel mission will characterise the chemical and thermal properties of the atmospheres of about a thousand exoplanets transiting their host star(s). The observation of such a large sample of planets will allow to deepen our understanding of planetary and atmospheric formation at the early stages, providing a truly representative picture of the chemical nature of exoplanets, and relating this directly to the type and chemical environment of the host star. Hence, the accurate and precise determination of the host star fundamental properties is essential to Ariel for drawing a comprehensive picture of the underlying essence of these planetary systems. We present here a structured approach for the characterisation of Ariel stars that accounts for the concepts of homogeneity and coherence among a large set of stellar parameters. We present here the studies and benchmark analyses we have been performing to determine robust stellar fundamental parameters, elemental abundances, activity indices, and stellar ages. In particular, we present results for the homogeneous estimation of the activity indices S and \(\log (R^{\prime }_{\text {HK}})\) , and preliminary results for elemental abundances of Na, Al, Mg, Si, C, N. In addition, we analyse the variation of a planetary spectrum, obtained with Ariel, as a function of the uncertainty on the stellar effective temperature. Finally, we present our observational campaign for precisely and homogeneously characterising all Ariel stars in order to perform a meaningful choice of final targets before the mission launch.



中文翻译:

爱丽儿主星的均匀表征

Ariel 任务将描述大约一千颗系外行星穿过其主星的大气的化学和热特性。对如此庞大的行星样本的观察将加深我们对早期行星和大气形成的理解,提供真正具有代表性的系外行星化学性质图,并将其与宿主的类型和化学环境直接联系起来星星。因此,准确和精确地确定主星的基本属性对于爱丽儿绘制这些行星系统的潜在本质的全面图片至关重要。我们在这里提出了一种用于表征爱丽儿星的结构化方法,该方法解释了大量恒星参数之间的同质性和相干性的概念。我们在这里介绍我们一直在进行的研究和基准分析,以确定稳健的恒星基本参数、元素丰度、活动指数和恒星年龄。特别是,我们提出了活动指数的均匀估计的结果S\(\log (R^{\prime }_{\text {HK}})\),以及 Na、Al、Mg、Si、C、N 元素丰度的初步结果。由 Ariel 获得的行星光谱的变化,是恒星有效温度不确定性的函数。最后,我们展示了我们的观测活动,以精确和均匀地表征所有爱丽儿恒星,以便在任务启动之前对最终目标进行有意义的选择。

更新日期:2021-07-13
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