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Monday, September 29, 2014

Did Wild Weather — Or A Companion — Cause Eerie Infrared Glow From This Baby Star?

Did Wild Weather — Or A Companion — Cause Eerie Infrared Glow From This Baby Star?:

Artist’s impression AS 205 N, which is a T Tauri star, and a smaller partner. Credit: P. Marenfeld (NOAO/AURA/NSF)

Watch out! Carbon monoxide gas is likely fleeing the disk of a young star like our Sun, producing an unusual signature in infrared. This could be the first time winds have been confirmed in association with a T Tauri star, or something else might be going on.

Because the observed signature of the star (called AS 205 N) didn’t meet what models of similar stars predicted, astronomers say it’s possible it’s not winds after all, but a companion tugging away at the gas.

“The material in the disk of a T Tauri star usually, but not always, emits infrared radiation with a predictable energy distribution,” stated Colette Salyk, an astronomer with the National Optical Astronomical Observatory who led the research. “Some T Tauri stars, however, like to act up by emitting infrared radiation in unexpected ways.”

View of the Atacama Large Millimeter/submillimeter Array (ALMA) site, which is 5,000 meters (16,400 feet) on the Chajnantor Plateau in the Atacama Desert of northern Chile. Credit: A. Marinkovic/X-Cam/ALMA (ESO/NAOJ/NRAO)

T Tauri stars are still young enough to be surrounded by dust and gas that could eventually form planets. Winds in the vicinity, however, could make it difficult for enough gas to stick around to form Jupiter-sized gas giants — or could change where planets are formed altogether.

While it’s still unclear what’s going on in AS 205 N, the astronomers plan to follow up their work with observing other T Tauri stars. Maybe with more observations, they reason, they can better understand what these signatures are telling us.

The weird environment was spotted by astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA), a set of 66 radio telescopes in Chile. A paper based on the research was published in the Astrophysical Journal and is also available in preprint version on Arxiv.

Source: National Radio Astronomy Observatory

Tagged as: ALMA, as 205 n, T Tauri

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The National Aeronautics and Space Administration (NASA) is the United States government agency responsible for the civilian space program as well as aeronautics and aerospace research. President Dwight D. Eisenhower established the National Aeronautics and Space Administration (NASA) in 1958 with a distinctly civilian (rather than military) orientation encouraging peaceful applications in space science. The National Aeronautics and Space Act was passed on July 29, 1958, disestablishing NASA's predecessor, the National Advisory Committee for Aeronautics (NACA). The new agency became operational on October 1, 1958.

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