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

Abstract

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.{sup 0}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.

Authors:
;
Publication Date:
OSTI Identifier:
22048005
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 747; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; ECLIPSE; EQUATOR; GENERAL CIRCULATION MODELS; HOT SPOTS; MAPPING; PLANETS; SPHERICAL CONFIGURATION; TWO-DIMENSIONAL CALCULATIONS; VARIATIONS

Citation Formats

Majeau, Carl, Agol, Eric, and Cowan, Nicolas B., E-mail: carl.majeau@gmail.com. A TWO-DIMENSIONAL INFRARED MAP OF THE EXTRASOLAR PLANET HD 189733b. United States: N. p., 2012. Web. doi:10.1088/2041-8205/747/2/L20.
Majeau, Carl, Agol, Eric, & Cowan, Nicolas B., E-mail: carl.majeau@gmail.com. A TWO-DIMENSIONAL INFRARED MAP OF THE EXTRASOLAR PLANET HD 189733b. United States. https://doi.org/10.1088/2041-8205/747/2/L20
Majeau, Carl, Agol, Eric, and Cowan, Nicolas B., E-mail: carl.majeau@gmail.com. 2012. "A TWO-DIMENSIONAL INFRARED MAP OF THE EXTRASOLAR PLANET HD 189733b". United States. https://doi.org/10.1088/2041-8205/747/2/L20.
@article{osti_22048005,
title = {A TWO-DIMENSIONAL INFRARED MAP OF THE EXTRASOLAR PLANET HD 189733b},
author = {Majeau, Carl and Agol, Eric and Cowan, Nicolas B., E-mail: carl.majeau@gmail.com},
abstractNote = {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.{sup 0}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.},
doi = {10.1088/2041-8205/747/2/L20},
url = {https://www.osti.gov/biblio/22048005}, journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 747,
place = {United States},
year = {Sat Mar 10 00:00:00 EST 2012},
month = {Sat Mar 10 00:00:00 EST 2012}
}