Fo r HD 189733b, we assume g = 2141 cms − 1 and an at- mosphere composed of mainly hydrogen and helium (85 per cent H, 15 per cent He), where µ = 2 . HD 189733b is a Jupiter-sized extrasolar planet orbiting a yellow dwarf star. This illustration shows HD 189733b, a huge gas giant that orbits very close to its host star HD 189733. The absolute pressure scale depends on the species responsible for the Rayleigh signature and its abundance.

Pour déceler les traces de vapeur d'eau, les astronomes ont analysé par spectroscopie les longueurs d'ondes infrarouges absorbées par la planète lorsqu'elle passe devant le soleil.

HD 189733b provides an excellent laboratory in which to study the consequences of chemistry of hot atmospheres. The recent spectra of HD 189733b contain signatures of CH 4, CO 2, CO, and H 2 O.

We propose to monitor the closest and brightest transiting exoplanet system for a time of 33 hours, from just before the start of transit, to just after the end of secondary eclipse. Since the planet's overall temperature variation is mild, scientists believe winds must be spreading the heat from its permanently sunlit side around to its dark side. The star is between 89 and 102 percent as enriched in iron as the Sun, making the star more than 600 million years old.

These two chemistries compete between ~1 and 10 bars in hot-Jupiter-like atmospheres, depending on the strength of the eddy mixing and temperature. HD 189733b, and all other hot Jupiters, are believed to be tidally locked like our moon, so one side of the planet always faces the star. La couleur est donc la seule similitude qui peut éventuellement être notée. In contrast, HD 189733b does not have a bloated radius, shows no stratospheric temperature inversion and orbits one of the most active extrasolar planet host stars. L'astre en question, dénommé HD 189733b, a été découvert en 2005 par le Français Francois Bouchy. The map, which shows temperature variations across the cloudy tops of a gas giant called HD 189733b, is made from infrared data taken by NASA's Spitzer Space Telescope. The planet's atmosphere is scorching with a temperature of over 1000 degrees Celsius, and it rains glass, sideways, in howling 7000 kilometre-per-hour winds. The planet's atmosphere is scorching with a temperature of over 1000 degrees Celsius, and it rains glass, sideways, in howling 7000 kilometre-per-hour winds. This exoplanet weather map charted temperature variations over the surface of a giant gas planet, HD 189733b. In this case, the high-altitude temperature rise for HD 189733b occurs at pressures of 10-5 to 10-8 bar. We discuss a plausible scenario for this species, a high-altitude silicate haze and the atmospheric temperature-pressure profile that results. 6726 × 10 − 24 g. En mars 2008, HD 189733b avait d'ailleurs déjà créé la surprise après l'annonce d'une détection de méthane dans son atmosphère. Très proche de son étoile, elle accomplit une révolution en 48 heures. Swiss researchers measured the temperature of 'Hot Jupiter' HD 189733b (artist's illustration shown). HD 189733 is a somewhat cooler star than HD 209458 (4980 versus 6075 K). This illustration shows HD 189733b, a huge gas giant that orbits very close to its host star HD 189733. Welcome to the exoplanet HD 189733b, where temperatures reach 3,000°C (5,400°F) and winds are in excess of 620mph (1,000km/h). 3 × 1 . The study also revealed that roaring winds likely whip through the planet's atmosphere. Son étoile est située à 63 années-lumière du Soleil. This is the first-ever map of the surface of an exoplanet, or a … In this case, the high-altitude temperature rise for HD 189733b occurs at …

They found the temperature reaches up to 3,000°C in the atmosphere. First Map of an Exoplanet Atmosphere This is the first-ever map of the surface of an exoplanet, or a planet beyond our solar system. Il se situe dans la constellation du Renard, à 64 années-lumière de la Terre. Sur cette planète bleue baptisée HD 189733b, le climat n’est pas semblable à celui de la Terre. HD 189733 A is an orange dwarf star of the spectral type K1.5V.