Latest Doppler spectroscopy Stories
Three undergraduate students have discovered an extrasolar planet. The extraordinary find, which turned up during their research project, is about five times as massive as Jupiter.
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.
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.
By Deborah Zabarenko WASHINGTON (Reuters) - What
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. How will scientists find the answer this mystery?
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 finding, reported in this week's issue of Nature, suggests that planets are more robust than previously believed.
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.
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.
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.
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