Although GJ 1214 has a low to moderate level of magnetic activity, it does undergo flares and is a source of X-ray emission with a base luminosity of 7.4 × 10 25 erg s −1. GJ 1214b (Charbonneau et al. 2–He atmosphere scenarios for the warm super-Earth GJ 1214b using an optimal estimation retrieval technique. Une perspective d'importance alors que ce type de planètes reste largement méconnu. Recent observations of the transiting super-Earth GJ 1214b reveal that its atmosphere may be hydrogen-rich or water-rich in nature, with clouds or hazes potentially affecting its transmission spectrum in the optical and very-near-IR. lincholn6echo. It is the most likely known candidate for being an ocean planet. This suggests that GJ 1214b has much more water than Earth does, and much less rock. GJ 1214b is about 2.7 times wider than Earth's but with a mass seven times higher. The temperature of the stellar corona is estimated to be about 3.5 × 10 6 K. Planetary system. 1214b is the most studied sub-Neptune exoplanet to date. This planet GJ 1214b has no land, but only oceans that stretch all over the surface. (d) Time averaged temperature on GJ 1214b on the 680 Pa level (about 62 km altitude) as-suming a global mean surface pressure of 105 Pa and a surface albedo of 0.4. The winds are westerly at the equator and easterly in the midlatitudes. Planet GJ 1214 GJ 1214b orbiting a five times smaller than the mass of the Sun and a brightness of 300 times fainter. As a result, the internal structure of GJ 1214b would be extraordinarily different from that of our world. Using the Hubble Space Telescope, U.S. astronomers discovered the planet GJ 1214b is shrouded by clouds and its temperature is caused by its nearby parent star. According to Harvard-Smithsonian Center for Astrophysics scientist and lead author Zachory Berta, "GJ1214b is like no planet we know of. The super-Earth GJ 1214b, which has 6.5 times the mass of our Earth, orbits its star once every 38 hours at a distance of only 1.3 million miles. Astronomers estimate the planet¹s temperature to be about 400 degrees Fahrenheit. GJ 1214b orbits the host star close to it, in contrast to Uranus and Neptune. The Astrophysical Journal, 716:1208–1216, 2010 June 20. A new analysis detailing the atmosphere of GJ 1214b—a planet located about 40 light years from earth and one that researchers have studied since 2009—appeared in the March issue of The Astrophysical Journal. GJ 1214b and the prospects for liquid water on super Earths - Volume 6 Issue S276 - Leslie A. Rogers, Sara Seager The star is located at a distance of 40 light-years away in the Ophiuchus constellation. In 2010, CfA scientist Jacob Bean and colleagues reported that they had measured the atmosphere of GJ 1214b, finding it likely that it was composed mainly of water. Recent surveys have revealed that planets intermediate in size between Earth and Neptune (“super-Earths”) are among the most common planets in the Galaxy[1, 2, 3]. We explore cloudy, extended H2–He atmosphere scenarios for the warm super-Earth GJ 1214b using an optimal estimation retrieval technique. Du fait de sa proximité et de la petite taille de son étoile parent, GJ 1214b est en effet la super-Terre la plus facile à observer. 8. The surface temperature of the planet GJ 1214b reaches 232º Celsius. THREE POSSIBLE ORIGINS FOR THE GAS LAYER ON GJ 1214b. GJ. Astronomers have confirmed the existence of a waterworld orbiting another sun, 40 light years away from us. GJ 1214b 3D GCM assuming a global mean surface pressure of 105 Pa and a surface albedo of 0.4. “ The high temperatures and high pressures would form exotic materials like ‘hot ice’ or ‘superfluid water’, substances that are completely alien to our everyday experience, ” Berta said. However a surface temperature of over 200 degrees Celsius plays against this. GJ 1214b probably formed farther out from its star, where water ice was plentiful, and then migrated in to its current location long ago. Recent measurements have shown its near-infrared transmission spectrum to be flat, pointing to a high-altitude opacity source in the exoplanet 's atmosphere, either equilibrium condensate clouds or photochemical hazes. ExoClimes - Exeter - September 9, 2010 Eliza Kempton. Abstract. It is much closer to its sun. GJ 1214b: an unusual waterworld; GJ 1214b: an unusual waterworld. If it is a water world, it could possibly be thought of as a bigger and hotter version of Jupiter's Galilean moon Europa. 2017, for an overview of available transit observations). From the size and period of its transit, astronomers deduced that GJ 1214b is 34,441.7 kilometres across, which is 2.7 times the diameter of Earth, and orbits its star every 38 hours at a distance of only two million kilometres (Earth is about 149.6 million kilometres from the Sun). But both temperature and pressure are high to the point that water could exist on this planet in the form of a superfluid and hot ice! Discovered by the MEarth project and investigated further by the HARPS spectrograph on ESO’s 3.6-metre telescope at La Silla, GJ1214b is the second super-Earth exoplanet for which astronomers have determined the mass and radius, giving vital clues about its structure. The planet’s mass (6.6 M⊕) and radius (2.7 R⊕) imply a density that is too low to be explained by rock and water ice alone. "GJ 1214b is like no planet we know of," Berta said. " L. A. Rogers and S. Seager. For that reason, scientists have nicknamed the planet "the waterworld". This planet, orbiting an M4.5 star only 13 pc from the Earth, is of particular interest because it lies between the Earth and Neptune in size and may be a member of a new class of planet that is neither terrestrial nor gas giant. lincholn6echo. case of exoplanet GJ 1214b, for which multiple ground-based and space-borne observations reveal a remarkably flat spectrum extending from visible to IR (see Angerhausen et al. (WFC3 isn't a spectrometer per se, but its infrared channel has 15 different filters spaced between 1.1 and 1.7 microns.) Likely posess significant gaseous envelope n't a spectrometer per se, but only that. Mearth survey again, thanks to near-infrared spectra collected by the MEarth survey 1214 1214b. The warm super-Earth GJ 1214b optimal estimation retrieval technique September 9, 2010 June 20 GJ1214 may look the constellation... Artist ’ s impression shows how the newly discovered super-Earth surrounding the nearby star GJ1214 may look 400 Fahrenheit... 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