Imaging technique may help discover Earth-like planets
by Staff Writers
Melbourne FL (SPX) Feb 24, 2016
One of the biggest quests in astrophysics is to find Earth-like planets around other stars - places where life may exist. Regular telescopes are not good at directly imaging such small objects because a host star's light generally drowns out the relatively dimmer light of a potential planet. But a new development in space imaging may solve that vexing problem.
A study led by Florida Institute of Technology astrophysicist Daniel Batcheldor has demonstrated that a charge injection device, or CID, has the ability to capture light from objects tens of millions of times fainter than another object in the same picture. An exoplanet next to bright star is one such example. This ability is a result of how the CID is used as a type of camera: each individual pixel works independently and uses a special indexing system. Very bright pixels get addressed very quickly, while the faint pixels are allowed to carry on gathering the fainter light.
"If this technology can be added to future space missions, it may help us make some profound discoveries regarding our place in the universe," Batcheldor said.
The study's findings were reported in the Jan. 18, 2016, edition of the Publications of the Astronomical Society of the Pacific.
To study exoplanets in detail, scientists are forced to make observations of these very faint objects next to bright stars. The situation is often described as the candle-next-to-the-lighthouse problem, though in reality is thousands of times worse. "Current instrument technology is very complex and expensive and still a ways off from achieving direct images of Earth-like planets," Batcheldor said.
With a grant from the American Astronomical Society, Batcheldor and several graduate students in the Physics and Space Sciences Department led the study using a CID on Florida Tech's 0.8-meter Ortega telescope. They were able to pick out objects 70 million times fainter through the glare of Sirius, the brightest star in our night sky. That's over one thousand times better than an off-the-shelf astronomical camera.
The fact that a faint object could be accurately detected through the less-than-ideal, thick Florida atmosphere makes the observations made by the CID more exciting. Batcheldor plans to test the CID later this year at a telescope on the Canary Islands, and a prototype for a CID is slated for testing on the International Space Station later this year. In both cases, the CIDs are being built by Thermo-Fisher Scientific.
Batcheldor's solution is of potential interest to scientists because it is relatively inexpensive compared to other ideas, such as an external occulter like a star shade, which would require multiple, complicated components working in tandem in space for getting a glimpse of just a few small, Earth-sized exoplanets.
"Personally, I like very simple, straightforward solutions, especially when there is a complex problem," he said. "The CID is able to look at a very bright source next to a very faint source and not experience much of the image degradation you would normally experience with a typical camera."
Florida Institute of Technology
Lands Beyond Beyond - extra solar planets - news and science
Life Beyond Earth
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2024 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. General Data Protection Regulation (GDPR) Statement Our advertisers use various cookies and the like to deliver the best ad banner available at one time. All network advertising suppliers have GDPR policies (Legitimate Interest) that conform with EU regulations for data collection. By using our websites you consent to cookie based advertising. If you do not agree with this then you must stop using the websites from May 25, 2018. Privacy Statement. Additional information can be found here at About Us.