A TWO-DIMENSIONAL INFRARED MAP OF THE EXTRASOLAR PLANET HD 189733b

被引：116

作者：

Majeau, Carl ^{[1
,2
]}

Agol, Eric ^{[1
]}

Cowan, Nicolas B. ^{[1
,3
,4
]}

机构：

[1] Univ Washington, Dept Astron, Seattle, WA 98195 USA

[2] Columbia Univ, Dept Comp Sci, New York, NY 10027 USA

[3] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA

[4] Northwestern Univ, CIERA, Evanston, IL 60208 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2012年 / 747卷 / 02期

关键词：

infrared: planetary systems; methods: observational; techniques: photometric; HOT JUPITERS; ATMOSPHERIC CIRCULATION; MU-M; EMISSION-SPECTRUM; RADIO SOURCES; EXOPLANETS; OCCULTATIONS; SIMULATIONS; DISSIPATION; 209458B;

D O I：

10.1088/2041-8205/747/2/L20

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We derive the first secondary eclipse map of an exoplanet, HD 189733b, based on Spitzer IRAC 8 mu m data. We develop two complementary techniques for deriving the two-dimensional planet intensity: regularized slice mapping and spherical harmonic mapping. Both techniques give similar derived intensity maps for the infrared dayside flux of the planet, while the spherical harmonic method can be extended to include phase variation data which better constrain the map. The longitudinal offset of the dayside hot spot is consistent with that found in prior studies, strengthening the claim of super-rotating winds, and eliminating the possibility of phase variations being caused by stellar variability. The latitude of the hot spot is within 12 degrees.5 (68% confidence) of the planet's equator, confirming the predictions of general circulation models for hot Jupiters and indicative of a small planet obliquity.

引用

页数：5

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