Probing the atmosphere of HD189733b with the Na I and KI lines

被引：9

作者：

Keles, E. ^{[1
]}

Kitzmann, D. ^{[2
]}

Mallonn, M. ^{[1
]}

Alexoudi, X. ^{[1
]}

Fossati, L. ^{[3
]}

Pino, L. ^{[4
,5
]}

Seidel, J., V ^{[6
]}

Carroll, T. A. ^{[1
]}

Steffen, M. ^{[1
]}

Ilyin, I. ^{[1
]}

Poppenhager, K. ^{[1
]}

Strassmeier, K. G. ^{[1
]}

von Essen, C. ^{[7
]}

Nascimbeni, V ^{[8
,9
]}

Turner, J. D. ^{[10
,11
]}

机构：

[1] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany

[2] Univ Bern, Ctr Space & Habitabil, Gesell Str 6, CH-3012 Bern, Switzerland

[3] Austrian Acad Sci, Space Res Inst, Schmiedlstr 6, A-8042 Graz, Austria

[4] Univ Amsterdam, Anton Pannekoek Inst Astron, Sci Pk 904, NL-1098 XII Amsterdam, Netherlands

[5] INAF, Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy

[6] Observ Univ Geneve, 51 Chemin Maillettes, CH-1290 Versoix, Switzerland

[7] Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark

[8] Ist Natl Astrofis, Osservatorio Astron Padova, I-35122 Padua, Italy

[9] Univ Padua, Dipartimento Fis & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy

[10] Cornell Univ, Ithaca, NY 14850 USA

[11] Univ Virginia, Charlottesville, VA 22904 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2020年 / 498卷 / 01期

基金：

欧洲研究理事会;

关键词：

planets and satellites: atmospheres; planets and satellites: composition; planets and satellites: gaseous planets; TRANSMISSION SPECTRA; HD; 189733B; EXOPLANET; ABSORPTION; RESOLUTION; SODIUM; PLANET; PEPSI; MASS; POTASSIUM;

D O I：

10.1093/mnras/staa2435

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

High spectral resolution transmission spectroscopy is a powerful tool to characterize exoplanet atmospheres. Especially for hot Jupiters, this technique is highly relevant, due to their high-altitude absorption, e.g. from resonant sodium (Na I) and potassium (K I) lines. We resolve the atmospheric KI absorption on HD189733b with the aim to compare the resolved KI line and previously obtained high-resolution Na I-D line observations with synthetic transmission spectra. The line profiles suggest atmospheric processes leading to a line broadening of the order of similar to 10 km/s for the Na I-D lines and only a few km/s for the KI line. The investigation hints that either the atmosphere of HD189733b lacks a significant amount of KI or the alkali lines probe different atmospheric regions with different temperature, which could explain the differences we see in the resolved absorption lines.

引用

页码：1023 / 1033

页数：11

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