HD 189733 System

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Exoplanetary Scratchpad

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Planet b (the first nearby Very Hot Jupiter, originally thought to be inflated) is the nearest planet discovered using the transit technique (62.9 ly). This is the first exoplanet to have its temperature mapped and was nicknamed Bull's Eye for its hot spot that is significantly offset from the starward pole. It is also the first exoplanet for which scattered light in the upper atmosphere has been detected and the second exoplanet with water detected and first with Methane and then Carbon Dioxide detected. It later was the first exoplanet whose gasses were detected from Earth-based telescopes. It was also found to spin up its star and magnetically interact with it, causing stellar storms. Hubble found that its atmosphere was a uniform blue haze.

HD 189733 System Web Pages

HD 189733 System Artwork

HD 189733 System In the News

Very Hot Jupiter Discovered (Dec 2005)

The nearest transiting planet which has a smaller period than most known planets was discovered by the ELODIE metallicity-biased search. It is the second transiting planet discovered bright enough to expect detailed measurements of its temperature and atmosphere to be made. It was found to have an anamolously large radius of 1.26 RJ.
Bad Astronomy Forum Thread

Posteriori Transit Detections (Jan 2006)

Astronomers dug through archived images of HD 189744 and found several past transit events

Temperature Taken (Feb 2006)

Planet b's temperature was taken by Spitzer. This is the first time infrared light has been detected from an exoplanet.

Parameters Refined (Apr 2006)

The radius (1.154 RJ) and other properties are refined, showing it does not have as anomalous radius as first thought.

Spin-Orbit Alignment Measured (2006)

Calculations suggest that inwards migration of Hot Jupiters generally preserves spin-orbit alignments

Diameter Directly Measured (Jan 2007)

Planet b becomes the first exoplanet to have its diameter measured through direct means. It is found to be larger than the measurements taken when it was first discovered and the ones taken in 2006 at 1.3 Jupiter Diameters.

Infrared Spectrum of Planet b Probed (Feb 2007)

Its atmosphere was probed along with HD 209458 b's, but water was surprisingly not detected in either planet. Clouds of Silicate could be preventing its detection though.,0,4084177.story?coll=orl-news-headlines-space

Escape State Hubble Observation Proposal

This is a proposal to use the HST to determine if and how much atmosphere of HD 189733 b is escaping the planet.

Surface Gravity Calculated (May 2007)

The sureface gravity was calculated for all transiting planets. HD 189733 b has one of the larger surface gravities, thus better able to hold onto its atmosphere than some other ones, though it is hotter than most.

Temperature Map Shows Heat Distributed Efficiently (May 2007)

A temperature map determined that its night and day side hemispheres had only slightly different temperatures, showing that its atmosphere was efficient at transporting heat.
HD 188753 b temperature map - Extrasolar Visions BBS Thread

Water Positively Detected (Jul 2007);_ylt=AlAhtvDHls4UHbx1zMj_V4vlmlUA

No Rings or Moons Detected (Jul 2007)

Haze Detected, Sunset Visualized (Dec 2007)

Scattered Light Detected (Dec 2007)

First Exoplanet with Methane Detected (Feb 2008)

New Weather Model Developed (Oct 2008)

First Exoplanet with Carbon Dioxide Detected (Nov 2008)

Exoplanetary Gas Spotted From Earth-Based Telescope For First Time (Feb 2010)

Magnetic Explanation for Inflated Hot Jupiters (Feb 2010)

Global Storm (Sep 2010)

Planet Spins its Star (Jan 2011)

Planet Engulfed in Uniform Blue Haze (Jul 2011)

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