Thermal emission of exoplanet XO-1b

被引：74

作者：

Machalek, Pavel ^{[1
,2
]}

McCullough, Peter R. ^{[2
]}

Burke, Christopher J. ^{[2
]}

Valenti, Jeff A. ^{[2
]}

Burrows, Adam ^{[3
]}

Hora, Joseph L. ^{[4
]}

机构：

[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[2] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[3] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[4] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 684卷 / 02期

关键词：

binaries : eclipsing; infrared : stars; planetary systems; stars : individual (XO-1);

D O I：

10.1086/590140

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We estimate flux ratios of the extrasolar planet XO-1b to its host star XO-1 at 3.6, 4.5, 5.8, and 8.0 mu m with IRAC on the Spitzer Space Telescope to be 0.00086 +/- 0.00007, 0.00122 +/- 0.00009, 0.00261 +/- 0.00031, and 0.00210 +/- 0.00029, respectively. The fluxes are inconsistent with a canonical cloudless model for the thermal emission from a planet and suggest an atmosphere with a thermal inversion layer and a possible stratospheric absorber. A newly emerging correlation between the presence of a thermal inversion layer in the planetary atmosphere and stellar insolation of the planet, as by Burrows and colleagues, is refined. The substellar point flux from the parent star at XO-1b of similar to 0.49; 10(9) erg cm(-2) s(-1) sets a new lower limit for the occurrence of a thermal inversion in a planetary atmosphere.

引用

页码：1427 / 1432

页数：6

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