MOLECULAR SIGNATURES IN THE NEAR-INFRARED DAYSIDE SPECTRUM OF HD 189733b

被引：208

作者：

Swain, M. R. ^{[1
]}

Vasisht, G. ^{[1
]}

Tinetti, G. ^{[2
]}

Bouwman, J. ^{[3
]}

Chen, Pin ^{[1
]}

Yung, Y. ^{[4
]}

Deming, D. ^{[5
]}

Deroo, P. ^{[1
]}

机构：

[1] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[2] UCL, London WC1E 6BT, England

[3] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[4] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA

[5] NASA, Goddard Space Flight Ctr, Planetary Syst Branch, Greenbelt, MD 20771 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2009年 / 690卷 / 02期

关键词：

planetary systems; techniques: spectroscopic; EXTRASOLAR PLANET; GIANT PLANETS; ATMOSPHERE; CIRCULATION; CONTRAST; DWARFS; WATER;

D O I：

10.1088/0004-637X/690/2/L114

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have measured the dayside spectrum of HD 189733b between 1.5 and 2.5 mu m using the NICMOS instrument on the Hubble Space Telescope. The emergent spectrum contains significant modulation, which we attribute to the presence of molecular bands seen in absorption. We find that water (H2O), carbon monoxide (CO), and carbon dioxide (CO2) are needed to explain the observations, and we are able to estimate the mixing ratios for these molecules. We also find temperature decreases with altitude in the similar to 0.01 < P < similar to 1 bar region of the dayside near-infrared photosphere and set an upper limit to the dayside abundance of methane (CH4) at these pressures.

引用

页码：L114 / L117

页数：4

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