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Topic: HD 209458b

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	Water on Extrasolar Planets: How Did Astronomers Detect the Composition of HD 209458b?
		The planet, HD 209458b, is one of only 14 extrasolar planets known that transit its parent star, meaning that the planet passes in front of the star as seen from Earth.
		HD 209458b is a gas giant planet, like Jupiter, but is much closer to its parent star than the gas giants in our solar system.
		HD 209458b was the first extrasolar planet observed to have an atmosphere and in April 2007 became the first observed to have water vapor in its atmosphere.
	astrophysics.suite101.com /article.cfm/water_on_hd_209458b (741 words)

	Catalog Page for PIA09200
		Spitzer studied two planets, HD 209458b and HD 189733b, both of which were found, surprisingly, to have no water in the tops of their atmospheres.
		HD 209458b is located about 153 light-years away in the constellation Pegasus, while HD 189733b is about 62 light-years away in the constellation Vulpecula.
		Of the approximately 200 known exoplanets, there are 12 besides HD 209458b and HD 189733b whose orbits are inclined in such a way that, from our point of view, they pass in front of their stars.
	photojournal.jpl.nasa.gov /catalog/PIA09200 (542 words)

	HubbleSite - NewsCenter - Hubble Probes Layer-cake Structure of Alien World's Atmosphere (01/31/2007) - The Full Story
		Unlike HD 209458b, Mercury is a small ball of iron with a rocky crust.
		HD 209458b is one of the most intensely studied extrasolar planets because it is one of the few known alien worlds that can be seen passing in front of, or transiting, its star, causing the star to dim slightly.
		HD 209458b is 150 light-years from Earth in the constellation Pegasus.
	hubblesite.org /newscenter/archive/releases/2007/07/full (756 words)

	SkyTonight.com - News from SkyTonight - Blowin' in the Planetary Wind
		HD 209458b is remarkable in that it transits the face of its host star.
		The star, 7th-magnitude HD 209458 in Pegasus, blowtorches the planet’s uppermost atmosphere to a temperature of 10,000 degrees Kelvin, causing at least 10,000 tons of hydrogen per second to escape in a wind.
		The planet HD 209458b appears to shed gas at such a high rate that it could lose up to 10 percent of its mass during its lifetime.
	skytonight.com /news/article_1172_1.asp (564 words)

	washingtonpost.com: Researchers View Planets Orbiting Nearby Stars
		All of them, however, were detected indirectly, either by observing a star's "wobble" as it was tugged by the planet's gravity, or because the star's light dimmed slightly as the orbiting planet passed in front of it.
		HD 209458b is 4.7 million miles from its host, with a year that lasts 3.5 Earth days.
		Both planets are similar in size to Jupiter, but astronomers had noted that HD 209458b was "bloated," with a radius 30 percent to 40 percent larger than Jupiter's.
	www.washingtonpost.com /ac2/wp-dyn/A58236-2005Mar22?language=printer (649 words)

	systemic - Why does HD 209458 b wear an XXL?
		Three of the planets in the table, HD 209458b, HD 149026b, and HD 189733b, have radii that do not agree at all with the predictions.
		HD 149026 b is much smaller than would be predicted for a standard-issue Jovian planet of its mass and temperature.
		HD 189733 is somewhat on the large side, and HD 209458 b, famously, is much larger than predicted.
	oklo.org /?p=19 (1392 words)

	Oxygen and carbon discovered in exoplanet atmosphere 'blow-off'
		Scientists using the NASA/ESA Hubble Space Telescope have observed the famous extrasolar planet HD 209458b passing in front of its parent star, and found oxygen and carbon surrounding the planet in an extended ellipsoidal envelope - the shape of a rugby-ball.
		It is already an extrasolar planet with an astounding list of firsts: the first extrasolar planet discovered transiting its sun, the first with an atmosphere, the first observed to have an evaporating hydrogen atmosphere (in 2003 by the same team of scientists) and now the first to have an atmosphere containing oxygen and carbon.
		The fact that they are visible in the upper atmosphere of HD 209458b confirms that atmospheric 'blow off' is occurring.
	www.eurekalert.org /pub_releases/2004-02/esa-oac020304.php (630 words)

	NASA - Astrobiology - Latest News (Site not responding. Last check: )
		The planet, known as HD 209458b, is a gas giant in a very close orbit around its Sun-like yellow star.
		The atmosphere of HD 209458b is made of hydrogen, evaporating to form a comet-like tail that trails behind the planet as it moves.
		HD 209458b was the first confirmed transiting extrasolar planet discovered and its atmosphere was the first ever identified on an extrasolar planet.
	astrobiology.arc.nasa.gov /news/expandnews.cfm?id=9462 (247 words)

	[No title]
		HD 209458b is too close to the star for Hubble to photograph directly.
		Astronomers estimate the amount of hydrogen gas escaping HD 209458b to be at least 10,000 tons per second, but possibly much more.
		In 1999 this star suddenly entered the astronomical "Hall of Fame" when HD 209458b was seen passing in front of the star and partly eclipsing it.
	aboutfacts.net /SpacePlanets8.htm (744 words)

	About The Extrasolars
		HD 209458b, discovered in 1999 in the constellation Pegasus, was the first of 14 such planets that have been found.
		Only a few of those planets, including HD 209458b, are bright enough for the spectral studies to yield useful data.
		Temperatures on HD 209458b range from 1100 to 1600 degrees Kelvin, and the planet is so close to its sun that it takes only three and a half days to complete its orbit.
	www.blogspan.org /blogs/permalinks/2-2007/about-the-extrasolars.html (732 words)

	NAI: News Stories (Site not responding. Last check: )
		The planet HD 209458b is a "hot Jupiter" — a planet that is about the same size and mass as Jupiter, but much closer to its star and therefore much more heated.
		But HD 209458b is unique because, unlike other hot Jupiters, the tilt of this planet's orbit makes it pass in front of the star relative to our line of sight from Earth.
		HD 209458b is estimated to be 70 percent the mass of Jupiter, or 220 times more massive than Earth.
	www.nai.arc.nasa.gov /news_stories/news_detail.cfm?ID=84 (1720 words)

	NAI: News Stories
		The planet HD 209458b is a "hot Jupiter" — a planet that is about the same size and mass as Jupiter, but much closer to its star and therefore much more heated.
		But HD 209458b is unique because, unlike other hot Jupiters, the tilt of this planet's orbit makes it pass in front of the star relative to our line of sight from Earth.
		HD 209458b is estimated to be 70 percent the mass of Jupiter, or 220 times more massive than Earth.
	nai.arc.nasa.gov /news_stories/news_detail.cfm?ID=84 (1731 words)

	Spaceflight Now \| Breaking News \| Hubble discovers an evaporating planet
		HD 209458b is too close to the star for Hubble to photograph directly.
		HD 209458b has a diameter 1.3 times that of Jupiter, and two-thirds the mass.
		In 1999 this star suddenly entered the astronomical "Hall of Fame" when HD 209458b was seen passing in front of the star and partly eclipsing it.
	spaceflightnow.com /news/n0303/12planet (1083 words)

	The Hindu : Evaporating planet
		The planet, called HD 209458b, orbits 4 million miles (7 million km) from its yellow, Sun-like star.
		Like HD 209458b, they are not usually found much closer than 4 million miles.
		HD 209458b has a diameter 1.3 times that of Jupiter, and two-thirds the mass.
	www.hindu.com /thehindu/seta/2003/03/20/stories/2003032000080200.htm (508 words)

	NASA - Dying Planet Leaks Carbon-Oxygen
		Using the NASA/ESA Hubble Space Telescope, scientists have observed the planet (officially known as HD 209458b) passing in front of its parent star, and found oxygen and carbon surrounding the planet in an extended ellipsoidal envelope - the shape of a rugby-ball.
		Osiris is the Egyptian god who lost part of his body - like HD 209458b - after his brother killed and cut him into pieces to prevent his return to life.
		Astronomers estimate the amount of hydrogen gas escaping HD 209458b to be at least 10,000 tonnes per second.
	www.nasa.gov /vision/universe/newworlds/Osiris_leaks_prt.htm (1354 words)

	the atmosphere of an extrasolar planet boiling off into space?
		Taking centre stage is the star HD 209458, the spitting image of our own Sun, and a planet orbiting it — called HD 209458b — which is 0.7 times the mass of Jupiter.
		Planet HD 209458b is located very close to its star (less than 7 million kilometres away, whereas the Earth is 150 million kilometres from the Sun) and it makes a complete orbit in 3.5 days.
		Planet HD 209458b is orbiting literally just above the flames of the star that gave birth to it.
	www.cite-sciences.fr /francais/ala_cite/science_actualites/sitesactu/question_actu.php?id_article=723&langue=an (747 words)

	HD 209458 b - Wikipedia, the free encyclopedia
		HD 209458 b was the first transiting extrasolar planet discovered, the first extrasolar planet known to have an atmosphere, the first extrasolar planet observed to have an evaporating hydrogen atmosphere, and the first extrasolar planet found to have an atmosphere containing oxygen and carbon.
		This would suggest that HD 209458B may not be covered with clouds (which are in general quite reflective), against all expectations.
		It is thought that HD 209458b's days are the same length as its years, that is, it rotates about its axis every time it rotates around its star, similar to how the moon orbits the earth.
	en.wikipedia.org /wiki/HD_209458b (1046 words)

	Грани.Ру // Наука :: "Хаббл" обнаружил испаряющуюся планету
		Орбита опаляемой светилом планеты, названной HD 209458b (поскольку, соответственно, кружится возле звезды HD 209458), всего лишь на 7 млн км удалена от беспощадного соседа - желтого карлика (это составляет 1/8 от размера орбиты Меркурия, обращающегося вокруг Солнца).
		HD 209458b вращается по своей маленькой орбите столь стремительно, что делает оборот за 3,5 земных дней.
		HD 209458b расположена слишком близко к звезде, чтобы ее можно было бы различить в ее свете, однако удается наблюдать планету косвенными методами, так как она заслоняет свет от небольшой части звезды во время своего прохождения по светящемуся диску, такое уменьшение светимости и удается измерить.
	grani.ru /Society/Science/m.25783.html (534 words)

	First light from exoplanets (March 2005) - News - PhysicsWeb
		Drake Deming of NASA's Goddard Space Flight Center and colleagues detected infrared radiation from HD 209458b, a planet that is orbiting a star some 153 light years from Earth in the constellation Pegasus.
		HD 209458b and TrES-1 were previously discovered using indirect methods: HD 209458b by measuring the "wobble" it causes in the star it orbits around and TrES-1 by so the so-called transit method -- where a planet causes its host star to "blink" as it passes in front it.
		The results should also help explain why some hot Jupiters like HD 209458b are oversized for their mass and age, while others such as TrES-1 are closer to the expected size for Jupiter-like planets.
	physicsweb.org /articles/news/9/3/15/1 (438 words)

	HEIC0301: EMBARGOED UNTIL: 12:00 (CET) 20 February, 2003
		Scientists using the NASA/ESA Hubble Space Telescope have observed the famous extrasolar planet HD 209458b passing in front of its parent star, and found an extended envelope of oxygen and carbon surrounding it believed to have the shape of a rugby-ball.
		On HD 209458b the fact that they are visible confirms that atmospheric ‘blow off’ is occurring.
		Astronomers estimate the amount of hydrogen gas escaping HD 209458b to be at least 10 000 tonnes per second.
	www2.iap.fr /exoplanetes/heic0403_4.html (1114 words)

	SkyTonight.com - News from SkyTonight - Planet Going Up in Smoke
		The planet that transits across the face of the star HD 209458 is shedding a huge cloud of hydrogen.
		HD 209458b, a gas giant racing closely around its star every 3.5 days, is losing at least 10,000 tons of hydrogen per second.
		HD 209458b was the first exoplanet found to be transiting across its star, a near twin of the Sun 150 light-years distant in Pegasus known as HD 209458.
	skytonight.com /news/3307386.html?page=1&c=y (524 words)

	EXOPLANET TRANSITS
		HD 209458 is 174 light years away in the constellation Pegasus.
		The planet, called HD 209458b, has a mass of about 0.69 Jupiter masses and a diameter about 1.43 times Jupiter's diameter.
		The atmosphere of exoplanet HD 209458b is "boiled" away by its nearby parent star.
	faculty.rmwc.edu /tmichalik/exoplanettransits.htm (565 words)

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