Subscribe free to our newsletters via your
. 24/7 Space News .




EXO WORLDS
Seeing ExoPlanet Atmospheres From The Ground
by Staff Writers
Moffett Field CA (SPX) Feb 10, 2010


The NASA Infrared Telescope Facility - at the summit of Mauna Kea, Hawaii. Credit: NASA/University of Hawaii

NASA astronomers have demonstrated that a David of a telescope can tackle Goliath-size questions in the quest to study Earth-like planets around other stars. Their work, reported in the journal Nature, provides a new tool for ground-based observatories, promising to accelerate by years the search for prebiotic, or life-related, molecules on planets orbiting stars beyond our solar system.

The scientists reported on a new technique used with a relatively small Earth-based telescope to identify an organic molecule in the atmosphere of a Jupiter-size planet nearly 63 light-years away. The measurement revealed details of the exoplanet's atmospheric composition and conditions, an unprecedented achievement from an Earth-based observatory.

The surprising new finding comes from a venerable 30-year-old, 3-meter-diameter (10-foot) telescope that ranks 40th among ground-based telescopes - NASA's Infrared Telescope Facility atop Mauna Kea, Hawaii.

The new technique promises to further speed the work of studying planet atmospheres by enabling studies from the ground that were previously possible only through a few very high-performance space telescopes.

"Given favorable observing conditions, this work suggests we may be able to detect organic molecules in the atmospheres of terrestrial planets with existing instruments," said lead author Mark Swain, an astronomer at NASA's Jet Propulsion Laboratory, Pasadena, Calif. This can allow fast and economical advances in focused studies of exoplanet atmospheres, accelerating our understanding of the growing stable of exoplanets.

"The fact that we have used a relatively small, ground-based telescope is exciting because it implies that the largest telescopes on the ground, using this technique, may be able to characterize terrestrial exoplanet targets," Swain said.

Currently, more than 400 exoplanets are known. Most are gaseous like Jupiter, but some "super-Earths" are thought to be large terrestrial, or rocky, worlds.

A true Earth-like planet, with the same size as our planet and distance from its star, has yet to be discovered. NASA's Kepler mission is searching from space now, and is expected to find several of these earthly worlds by the end of its three-and-a-half-year prime mission.

On Aug. 11, 2007, Swain and his team turned the infrared telescope to the hot, Jupiter-size planet HD 189733b in the constellation Vulpecula.

Every 2.2 days, the planet orbits a K-type main sequence star slightly cooler and smaller than our Sun. HD189733b had already yielded breakthrough advances in exoplanet science, including detections of water vapor, methane and carbon dioxide, using space telescopes.

Using the new technique, the astronomers successfully detected carbon dioxide and methane in the atmosphere of HD 189733b with a spectrograph, which splits light into its components to reveal the distinctive spectral signatures of different chemicals.

Their key work was development of a novel calibration method to remove systematic observation errors caused by the variability of Earth's atmosphere and instability due to the movement of the telescope system as it tracks its target.

"As a consequence of this work, we now have the exciting prospect that other suitably equipped yet relatively small ground-based telescopes should be capable of characterizing exoplanets," said John Rayner, the NASA Infrared Telescope Facility support scientist who built the SpeX spectrograph used for these measurements.

"On some days we can't even see the Sun with the telescope, and the fact that on other days we can now obtain a spectrum of an exoplanet 63 light-years away is astonishing."

In the course of their observations, the team found unexpected bright infrared emission from methane that stands out on the day side of HD 198733b, indicating some kind of activity in the planet's atmosphere.

Swain said this puzzling feature could be related to the effect of ultraviolet radiation from the planet's parent star hitting the planet's upper atmosphere, but more detailed study is needed. "This feature indicates the surprises that await us as we study exoplanet atmospheres," he added.

"An immediate goal for using this technique is to more fully characterize the atmosphere of this and other exoplanets, including detection of organic and possibly prebiotic molecules" like those that preceded the evolution of life on Earth, said Swain.

"We're ready to undertake that task." Some early targets will be the super-Earths. Used in synergy with observations from NASA's Hubble, Spitzer and the future James Webb Space Telescope, the new technique "will give us an absolutely brilliant way to characterize super-Earths," Swain said.

.


Related Links
Jet Propulsion Laboratory
Lands Beyond Beyond - extra solar planets - news and science
Life Beyond Earth






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





EXO WORLDS
New technique helps search for another Earth
Paris (AFP) Feb 3, 2010
The quest to find another world that sustains life has been boosted by a technique that should let less expensive ground-based telescopes join the search, a study said on Wednesday. So far, more than 400 so-called exoplanets - planets that orbit stars other than the Sun - have been spotted since 1995, although none has been a rocky, watery world like our own. The key to finding the hab ... read more


EXO WORLDS
Moon Exploration is Not Dead

Seed Bank For The Moon

Obama to propose abandoning US return to Moon: report

NASA Adds Israeli Technical Expertise To Lunar Science Research

EXO WORLDS
Craters Young And Old In Sirenum Fossae

Spirit Prepares for Winter

A Stationary Spirit

Spirit Bogged In Sand: Now A Stationary Research Platform

EXO WORLDS
The Shoulders Of Giants

Businessman to fly African flags on space trip

Orbital Sciences Happy While Lockheed Is Sad

Dragon Spacecraft Completes Cargo Loading Milestone

EXO WORLDS
UK's First China Space Race Exhibition Launched

No Spacewalk From Tiangong-1

China's Mystery Spacelab

China launches orbiter for navigation system: state media

EXO WORLDS
Panoramic Dome On Its Way To ISS

US shuttle to deliver panoramic dome to space lab

Progress Docks With ISS

ISS Primed For New Era Of Scientific Discoveries

EXO WORLDS
Russia Prepares To Launch US Telecoms Satellite

Solar Dynamics Observatory At Launch Pad

Arianespace Heads Into Another Busy Year

Arianespace Wins ESA Contract

EXO WORLDS
Seeing ExoPlanet Atmospheres From The Ground

New Technique For Detecting Earth-Like Planets

New technique helps search for another Earth

NASA's Rosetta "Alice" Spectrometer Reveals Earth's UV Fingerprint

EXO WORLDS
Optical Refrigeration Expected To Enhance Airborne And Spaceborne Apps

Ball Aerospace Tests Landsat Operational Land Imager

Iran To Unveil Five Space Projects

US book publishers smiling again as Kindle rivals emerge




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal 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. 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. Privacy Statement