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Latest Doppler spectroscopy Stories

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2008-12-04 08:00:00

Three undergraduate students, from Leiden University in the Netherlands, have discovered an extrasolar planet. The extraordinary find, which turned up during their research project, is about five times as massive as Jupiter. This is also the first planet discovered orbiting a fast-rotating hot star.The students were testing a method of investigating the light fluctuations of thousands of stars in the OGLE database in an automated way. The brightness of one of the stars was found to decrease...

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2007-07-11 12:10:00

Astronomers who used powerful telescopes in Arizona and Chile in a survey for planets around nearby stars have discovered that extrasolar planets more massive than Jupiter are extremely rare in other outer solar systems. University of Arizona astronomers and their collaborators from the European Southern Observatory, Max Planck Institute for Astronomy at Heidelberg, Italy's Arcetri Observatory, the W.M. Keck Observatory and the Harvard-Smithsonian Center for Astrophysics just concluded a...

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2007-05-29 00:00:00

Honolulu, Hawaii -- The world's largest and most prolific team of planet hunters announced Monday the discovery of 28 new planets outside our solar system, increasing to 236 the total number of known exoplanets. University of California, Berkeley, post-doctoral fellow Jason T. Wright and newly minted Ph.D. John Asher Johnson reported the new exoplanets at a noon media briefing at the semi-annual meeting of the American Astronomical Society (AAS) in Honolulu. The findings are a result of...

2006-02-06 10:22:47

By Deborah Zabarenko WASHINGTON (Reuters) - What if ET isn't cute? What if extraterrestrial life doesn't even touch the surface of a faraway planet, but instead floats above its hostile surface like a hot-air balloon? Scientists say this is possible, based on data they have about the big gassy planets detected around stars other than our sun, but no one has actually seen this. To make this data come to life, astronomers turn to Lynette Cook, space artist extraordinaire. Since...

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2005-08-22 14:15:00

NASA -- A JPL scientist and his team are preparing to bring to the study of extrasolar planets what George Lucas brought to "Star Wars": the prequel. Most extrasolar planets discovered so far are "hot Jupiters," gas giants orbiting close to their parent stars. But according to current theory, such planets should form much farther from their stars, where temperatures are cold enough for water and other volatiles to freeze. Finding these planets close to their stars is like finding snowmen...

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2005-07-14 00:15:00

NASA -- A NASA-funded astronomer has discovered a world where the sun sets over the horizon, followed by a second sun and then a third. The new planet, called HD 188753 Ab, is the first known to reside in a classic triple-star system. "The sky view from this planet would be spectacular, with an occasional triple sunset," said Dr. Maciej Konacki (MATCH-ee Konn-ATZ-kee) of the California Institute of Technology, Pasadena, Calif., who found the planet using the Keck I telescope atop Mauna Kea...

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2005-07-11 14:37:58

In the past decade, more than 130 extrasolar planets have been discovered. Almost all have been found using a technique that measures tiny changes in a star's radial velocity, the speed of its motion relative to Earth. Astronomer Alan Boss tells the story how the first of these discoveries came about. Astrobiology Magazine -- More than 130 extrasolar planets have been discovered to date. Most of these have been found using a technique that measures tiny changes in a star's radial velocity,...

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2005-04-14 00:15:00

EVANSTON, Ill. -- Except for the fact that we call it home, for centuries astronomers didn't have any particular reason to believe that our solar system was anything special in the universe. But, beginning with the discovery 10 years ago of the first planet outside our solar system, evidence suggests that, as far as planetary systems go, the solar system might be special indeed. Instead of the nice circular orbits our nine planets enjoy, most of the more than 160 extrasolar planets detected...

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2005-02-17 07:30:00

NASA -- The past four weeks have been heady ones in the planet-finding world: Three teams of astronomers announced the discovery of 12 previously unknown worlds, bringing the total count of planets outside our solar system to 145. Just a decade ago, scientists knew of only the nine planets - those in our local solar system. In 1995, improved detection techniques produced the first solid evidence of a planet circling another star. A proliferation of discoveries followed, and now dozens of...