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Neutral Iron Emission Lines from the Dayside of KELT-9b: The GAPS Program with HARPS-N at TNG XX
The Astrophysical Journal Letters ( IF 8.8 ) Pub Date : 2020-05-13 , DOI: 10.3847/2041-8213/ab8c44
Lorenzo Pino 1 , Jean-Michel Dsert 1 , Matteo Brogi 2, 3, 4 , Luca Malavolta 5, 6 , Aurlien Wyttenbach 7 , Michael Line 8 , Jens Hoeijmakers 9, 10 , Luca Fossati 11 , Aldo Stefano Bonomo 3 , Valerio Nascimbeni 12 , Vatsal Panwar 1 , Laura Affer 13 , Serena Benatti 13 , Katia Biazzo 6 , Andrea Bignamini 14 , Franscesco Borsa 15 , Ilaria Carleo 12, 16 , Riccardo Claudi 12 , Rosario Cosentino 17 , Elvira Covino 18 , Mario Damasso 3 , Silvano Desidera 12 , Paolo Giacobbe 3 , Avet Harutyunyan 17 , Antonino Francesco Lanza 6 , Giuseppe Leto 6 , Antonio Maggio 13 , Jesus Maldonado 13 , Luigi Mancini 3, 19, 20 , Giuseppina Micela 13 , Emilio Molinari 21 , Isabella Pagano 6 , Giampaolo Piotto 5 , Ennio Poretti 15, 17 , Monica Rainer 22 , Gaetano Scandariato 6 , Alessandro Sozzetti 3 , Romain Allart 10 , Luca Borsato 5 , Giovanni Bruno 6 , Luca Di Fabrizio 17 , David Ehrenreich 10 , Aldo Fiorenzano 17 , Giuseppe Frustagli 15, 23 , Baptiste Lavie 10 , Christophe Lovis 10 , Antonio Magazz 17 , Domenico Nardiello 5 , Marco Pedani 17 , Riccardo Smareglia 14
Affiliation  

We present the first detection of atomic emission lines from the atmosphere of an exoplanet. We detect neutral iron lines from the dayside of KELT-9b ( T eq ∼ 4000 K). We combined thousands of spectrally resolved lines observed during one night with the HARPS-N spectrograph ( R ∼ 115,000), mounted at the Telescopio Nazionale Galileo. We introduce a novel statistical approach to extract the planetary parameters from the binary mask cross-correlation analysis. We also adapt the concept of contribution function to the context of high spectral resolution observations, to identify the location in the planetary atmosphere where the detected emission originates. The average planetary line profile intersected by a stellar G2 binary mask was found in emission with a contrast of 84 ± 14 ppm relative to the planetary plus stellar continuum (40% ± 5% relative to the planetary continuum only). This result unambiguously indicates the presence of an atmospheric thermal i...

中文翻译:

KELT-9b白天的中性铁排放线:TNG XX的采用HARPS-N的GAPS计划

我们提出了从系外行星大气中首次探测原子发射线的方法。我们从KELT-9b(Teq〜4000 K)的白天检测到中性铁线。我们将一晚观察到的数千条光谱分辨谱线与安装在Telescopio Nazionale Galileo上的HARPS-N光谱仪(R约115,000)结合在一起。我们介绍了一种新颖的统计方法,可从二值蒙版互相关分析中提取行星参数。我们还将贡献函数的概念与高光谱分辨率观测的背景相适应,以识别探测到的排放源在行星大气中的位置。在发射中发现了由恒星G2二元掩模相交的平均行星线轮廓,相对于行星加恒星连续体的对比度为84±14 ppm(仅相对于行星连续体的对比度为40%±5%)。该结果明确表明存在大气热辐射。
更新日期:2020-05-13
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