Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Distant starlight reveals alien atmosphere

28.11.2001


Is there anybody out there?
© NASA


Hubble spots atmosphere on planet 150 light years away.

Astronomers have glimpsed the atmosphere of a planet in a solar system other than our own for the first time. The feat is a first step towards detecting planets capable of supporting life elsewhere in the Universe.

David Charbonneau, of the California Institute of Technology, Pasadena, and colleagues, pointed the Hubble space telescope at the planet, which lies 150 light years away in the constellation Pegasus. Of the 74 extrasolar planets discovered so far, this is the only one whose orbit passes between its star and the Earth, allowing the researchers to catch the signs of starlight shining through its atmosphere.



"It’s a very exciting discovery," says astronomer Phil Armitage of St Andrews University, Scotland. "We knew that these planets had atmospheres, but we didn’t know whether they would be detectable. It’s an astonishing technical achievement."

There is little chance that this particular planet supports life. It is a giant ball of gas about the same size as Jupiter, and lies closer to its star than Mercury does to our Sun. One year lasts a mere four Earth days, and it is fearsomely hot - about 1,100 °C.

Each element and compound in the planet’s atmosphere absorbs and scatters starlight of a tell-tale colour. The researchers fine-tuned Hubble to hunt for the signature of sodium, because this element gives a particularly strong signal: "a little goes a really long way," says Charbonneau.

In fact, they saw less sodium in the atmosphere than theoretical models had predicted, perhaps, suspects Charbonneau, because clouds in the planet’s atmosphere blot out some of the starlight.

Next, the team hopes to find potassium, methane and water vapour. While the planet is almost certainly too hot and reactive to contain any of the oxygen that would be the give-away of a potentially inhabited world, Charbonneau isn’t discouraged. The discovery of Earth-like planets is "much closer than most people imagine," he says.

Two space telescopes currently on the drawing board - NASA’s Kepler and the European Space Agency’s Eddington, should have the power to find Earth-sized planets orbiting distant stars at more hospitable distances, and analyse their atmospheres. Kepler could be finding worlds like our own by 2010.

JOHN WHITFIELD | © Nature News Service
Further information:
http://www.nature.com/nsu/011129/011129-11.html

More articles from Physics and Astronomy:

nachricht Space radiation won't stop NASA's human exploration
18.10.2017 | NASA/Johnson Space Center

nachricht Study shows how water could have flowed on 'cold and icy' ancient Mars
18.10.2017 | Brown University

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Neutron star merger directly observed for the first time

University of Maryland researchers contribute to historic detection of gravitational waves and light created by event

On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...

Im Focus: Breaking: the first light from two neutron stars merging

Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.

Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....

Im Focus: Smart sensors for efficient processes

Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).

When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...

Im Focus: Cold molecules on collision course

Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.

How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...

Im Focus: Shrinking the proton again!

Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.

It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ASEAN Member States discuss the future role of renewable energy

17.10.2017 | Event News

World Health Summit 2017: International experts set the course for the future of Global Health

10.10.2017 | Event News

Climate Engineering Conference 2017 Opens in Berlin

10.10.2017 | Event News

 
Latest News

Osaka university researchers make the slipperiest surfaces adhesive

18.10.2017 | Materials Sciences

Space radiation won't stop NASA's human exploration

18.10.2017 | Physics and Astronomy

Los Alamos researchers and supercomputers help interpret the latest LIGO findings

18.10.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>