HD 189733 b Mapping

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HD 189733 b Mapping

Post by Sirius_Alpha on 9th February 2012, 9:57 pm

A Two-Dimensional Infrared Map of the Extrasolar Planet HD 189733b
http://arxiv.org/abs/1202.1883

We derive the first secondary eclipse map of an exoplanet, HD 189733b, based on Spitzer IRAC 8 micron 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 day-side 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 day-side 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 12.5 deg (68% confidence) of the planet's equator, confirming the predictions of general circulation models for hot Jupiters and indicative of a small planet obliquity.


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Re: HD 189733 b Mapping

Post by Sirius_Alpha on 19th February 2012, 9:23 pm

Another group finds that the hot spot might be shifted further north in latitude.
http://arxiv.org/abs/1202.3829

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Re: HD 189733 b Mapping

Post by Lazarus on 21st February 2012, 6:33 pm

Hot Jupiters are weird. And I have to wonder how much of the variation between experimental results is due to weather and how much due to systematics.

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Re: HD 189733 b Mapping

Post by Sirius_Alpha on 9th November 2012, 9:08 am

Towards consistent mapping of distant worlds: Secondary eclipse scanning of the exoplanet HD 189733b

http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201219060&Itemid=129

pdf: http://www.aanda.org/articles/aa/pdf/forth/aa19060-12.pdf

Takes a more detailed look at the interplay between exoplanet shape and orbital parameters and how it affects the brightness distribution of the planet's disc.

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