Category: University of Arizona

Researchers have created a new giant dual-laser that could control the weather

On By A.P.In Da Brayn, laser, Nature Photonics, Science, Technology, University of Arizona, University of Central Florida, Weather, weather controlLeave a comment

Zeus, God of the Sky, may be out of work, as scientists at the University of Central Florida believe they’ve developed a technique — which involves pointing a high powered laser at the sky — to induce clouds to drop rain and hurl thunderbolts.

Scientists have known that water condensation and lightning activity in storm clouds are associated with large amounts of static charged particles. In theory, stimulating those particles with a laser is the key to harnessing Zeus-like powers.

The hard part, scientists say, is creating a laser beam with the right combination of range, precision and strength.

“When a laser beam becomes intense enough, it behaves differently than usual — it collapses inward on itself,” explained Matthew Mills, a graduate student in the UCF Center for Research and Education in Optics and Lasers. “The collapse becomes so intense that electrons in the air’s oxygen and nitrogen are ripped off creating plasma — basically a soup of electrons.”

But students at UCF’s College of Optics & Photonics have collaborated with researchers at the University of Arizona to create a “dressed laser” that they think might be up for the challenge of controlling the weather.

The dressed laser is a high-power laser beam surrounded by a second beam, which acts as a refueling agent, sustaining the strength and accuracy of the central beam over longer distances.

“Since we have control over the length of a filament with our method, one could seed the conditions needed for a rainstorm from afar,” said Mills. “Ultimately, you could artificially control the rain and lightning over a large expanse with such ideas.”

The students recently published their research findings in the journal Nature Photonics. Their efforts were supported by a $7.5 million grant from the Department of Defense.

Read more: http://www.upi.com/Science_News/2014/04/19/Giant-lasers-could-control-the-weather/1691397928851/#ixzz2zRZl9YTP

Thanks to Da Brayn for bringing this to the attention of the It’s Interesting community.

Enormous alien planet discovered in most distant orbit ever seen

On By A.P.In astronomy, Exoplanets, HD 106906 b, Jupiter, Space and Time, University of Arizona, Vanessa BaileyLeave a comment

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An enormous alien planet — one that is 11 times more massive than Jupiter — was discovered in the most distant orbit yet found around a single parent star.

The newfound exoplanet, dubbed HD 106906 b, dwarfs any planetary body in the solar system, and circles its star at a distance that is 650 times the average distance between the Earth and the sun. The existence of such a massive and distantly orbiting planet raises new questions about how these bizarre worlds are formed, the researchers said.

“This system is especially fascinating because no model of either planet or star formation fully explains what we see,” study lead researcher Vanessa Bailey, a fifth-year graduate student in the University of Arizona’s department of astronomy, said in a statement.

In the most commonly accepted theories of planet formation, it is thought that planets that orbit close to their parent star, such as Earth, began as small, asteroid-type bodies that clumped together in the primordial disk of gas and dust around the burgeoning star. Yet, this process operates too slowly to explain how giant planets form far away from their star, the researcher said.

Alternative hypotheses have suggested that distant giant planets may form in ways similar to mini binary star systems, Bailey said.

“A binary star system can be formed when two adjacent clumps of gas collapse more or less independently to form stars, and these stars are close enough to each other to exert a mutual gravitation attraction and bind them together in an orbit,” she explained.

In the HD 106906 system, the star and planet may have collapsed independently, but the materials that clumped together to form the planet were insufficient for it to grow large enough to ignite into a new star, Bailey said.

But, there are still problems with this scenario. For one, difference between the masses of two stars in a binary system is typically no more than a ratio of 10 to 1.

“In our case, the mass ratio is more than 100-to-1,” Bailey said. “This extreme mass ratio is not predicted from binary star formation theories — just like planet formation theory predicts that we cannot form planets so far from the host star.”

Researchers are also keen to study the new planet, because leftover material from when the planet and star formed can still be detected.

“Systems like this one, where we have additional information about the environment in which the planet resides, have the potential to help us disentangle the various formation models,” Bailey said. “Future observations of the planet’s orbital motion and the primary star’s debris disk may help answer that question.”

The planet HD 106906 b is only 13 million years old, and is still glowing from the residual heat from its formation,” the researchers said. By comparison, Earth formed 4.5 billion years ago, which makes it roughly 350 times older than the newfound exoplanet.

The planet was found using a thermal infrared camera mounted on the Magellan telescope in the Atacama Desert in Chile. The researchers used data from the Hubble Space Telescope to confirm their discovery.

The study, which has been accepted for publication in a future issue of The Astrophysical Journal Letters, could lead to a better understanding of distantly orbiting exoplanets.

“Every new directly detected planet pushes our understanding of how and where planets can form,” study co-investigator Tiffany Meshkat, a graduate student at Leiden Observatory in the Netherlands, said in a statement. “Discoveries like HD 106906 b provide us with a deeper understanding of the diversity of other planetary systems.”

http://www.nbcnews.com/science/enormous-alien-planet-discovered-most-distant-orbit-ever-seen-2D11703497

Thanks to Dr. D for bringing this to the attention of the It’s Interesting community.