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Record Nine-Planet Star System Discovered?
Alien star likely has more planets than the sun, astronomers say.
An artist’s conception of the planetary system around HD 10180.Illustration courtesy of L. Calçada, European Southern Observatory
A star about 127 light-years from Earth may have even more planets than the sun, which would make the planetary system the most populated yet found.
According to a new study, HD 10180—a sunlike star in the southern constellation Hydrus—may have as many as nine orbiting planets, besting the eight official planets in our solar system.
The star first made headlines in 2010 with the announcement of five confirmed planets and two more planetary candidates.
Now, reanalysis of nearly a decade’s worth of data has not only confirmed the existence of the two possible planets but also uncovered the telltale signals of two additional planets possibly circling the star, bringing the total to nine.
“There certainly is, according to my results, strong evidence that this is the most populous planetary system detected—possibly even richer than the solar system,” said study leader Mikko Tuomi, an astronomer at the University of Hertfordshire in the U.K.
“But the two new planetary signals I report exceed the detection threshold only just.”
Early indications are that both newly detected worlds are super-Earths—planets slightly larger than Earth with rocky surfaces—but more measurements will be needed to confirm their existence.
Scorching Super-Earths
The planetary system around HD 10180 is too far from Earth for us to see directly. (Related: “First Pictures of Alien Planet System Revealed.”)
Instead, astronomers detected the planets by measuring their gravitational tugs on the host star using the High Accuracy Planet Searcher (HARPS) instrument on the European Southern Observatory’s 3.6-meter telescope at La Silla, Chile.
The five established planets are between 12 and 25 times the mass of Earth and are all around the sizes of Uranus or Neptune, meaning the worlds are most likely icy gas giants.
Of the two newly confirmed planets, one is about 65 times the mass of Earth, and it orbits farther beyond the main group. The other planet is a super-Earth 1.3 times the mass of our home world that circles very close to the host star.
(Related: “New Planet System Found—May Have Hidden ‘Super Earth’.”)
The two new, unconfirmed planets also have tight orbits: A planet thought to be 1.9 times the mass of Earth completes its orbit in 10 days, while the other world is likely 5.1 Earth masses with an orbit lasting 68 days.
That means, if the planets do exist, they’d be unlikely candidates to host life.
“They are likely hot planets without dense, gaseous atmospheres, because they are just so close to their star,” Tuomi said.
The astronomer now hopes to take more measurements and verify the planets are really there.
Tuomi also hopes to scan the skies for other crowded planetary systems like HD 10180. (Also see “‘Solar Systems’ Common Across the Galaxy, NASA Probe Hints.”)
“We have only just started to detect planets, and the known exoplanet systems are but a tip of the iceberg,” he said.
“So [our] solar system is only one example among a spectrum of different planetary systems we will find in the near future and [is] definitely not unique.”](http://24.media.tumblr.com/tumblr_m3l09aTU5B1qcb72ro1_500.jpg)
Record Nine-Planet Star System Discovered?
Alien star likely has more planets than the sun, astronomers say.
An artist’s conception of the planetary system around HD 10180.
Illustration courtesy of L. Calçada, European Southern ObservatoryA star about 127 light-years from Earth may have even more planets than the sun, which would make the planetary system the most populated yet found.
According to a new study, HD 10180—a sunlike star in the southern constellation Hydrus—may have as many as nine orbiting planets, besting the eight official planets in our solar system.
The star first made headlines in 2010 with the announcement of five confirmed planets and two more planetary candidates.
Now, reanalysis of nearly a decade’s worth of data has not only confirmed the existence of the two possible planets but also uncovered the telltale signals of two additional planets possibly circling the star, bringing the total to nine.
“There certainly is, according to my results, strong evidence that this is the most populous planetary system detected—possibly even richer than the solar system,” said study leader Mikko Tuomi, an astronomer at the University of Hertfordshire in the U.K.
“But the two new planetary signals I report exceed the detection threshold only just.”
Early indications are that both newly detected worlds are super-Earths—planets slightly larger than Earth with rocky surfaces—but more measurements will be needed to confirm their existence.
Scorching Super-Earths
The planetary system around HD 10180 is too far from Earth for us to see directly. (Related: “First Pictures of Alien Planet System Revealed.”)
Instead, astronomers detected the planets by measuring their gravitational tugs on the host star using the High Accuracy Planet Searcher (HARPS) instrument on the European Southern Observatory’s 3.6-meter telescope at La Silla, Chile.
The five established planets are between 12 and 25 times the mass of Earth and are all around the sizes of Uranus or Neptune, meaning the worlds are most likely icy gas giants.
Of the two newly confirmed planets, one is about 65 times the mass of Earth, and it orbits farther beyond the main group. The other planet is a super-Earth 1.3 times the mass of our home world that circles very close to the host star.
(Related: “New Planet System Found—May Have Hidden ‘Super Earth’.”)
The two new, unconfirmed planets also have tight orbits: A planet thought to be 1.9 times the mass of Earth completes its orbit in 10 days, while the other world is likely 5.1 Earth masses with an orbit lasting 68 days.
That means, if the planets do exist, they’d be unlikely candidates to host life.
“They are likely hot planets without dense, gaseous atmospheres, because they are just so close to their star,” Tuomi said.
The astronomer now hopes to take more measurements and verify the planets are really there.
Tuomi also hopes to scan the skies for other crowded planetary systems like HD 10180. (Also see “‘Solar Systems’ Common Across the Galaxy, NASA Probe Hints.”)
“We have only just started to detect planets, and the known exoplanet systems are but a tip of the iceberg,” he said.
“So [our] solar system is only one example among a spectrum of different planetary systems we will find in the near future and [is] definitely not unique.”
The famous one’
Super Moon, as seen from Lima, Peru.
05 MAY 2012
(Source: joywithoutfear)
Giant black hole is seen gobbling up a star
A star in another galaxy was ripped apart by the black hole’s intense gravity 2 billion years ago and recently witnessed by scientists. ‘It turned into this really thin piece of spaghetti,’ one said.
Back when single-celled organisms ruled Earth, a gigantic black hole lurking quietly at the center of a distant galaxy dismantled and devoured a star.
On Wednesday, astronomers reported that they watched the whole thing unfold over a period of 15 months starting in 2010, the first time such an event had been witnessed in great detail from start to finish.
“The star got so close that it was ripped apart by the gravitational force of the black hole,” said Johns Hopkins University astronomer Suvi Gezari, lead author of a paper about the observations that was published online by the journal Nature.
Studying the radiation that escaped the catastrophe — signals that took about 2 billion years to reach Earth — Gezari and her colleagues were able to determine the size and composition of the ill-fated star and suss out the characteristics of the black hole that destroyed it.
Astronomers call these star-obliterating events tidal disruptions. The process is similar to — but far more violent than — tides on Earth, which are created by the moon’s gravitational tug on the planet and its oceans.
Estimated to occur only about once every 10,000 or so years in each galaxy, tidal disruptions are extremely difficult to spot. But astronomers seek them out because they make black holes visible, and therefore possible to study.
M106 (NGC 4258): a Seyfert active galaxy, powered by matter falling into a massive central black hole
reflection nebulae M78 (center) and NGC 2071 (lower left)
(located in the Orion Molecular Cloud Complex)
(Source: inrogue)
