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Water found in hot planet's orbit
By Julian Siddle
Science Reporter, BBC News

Scientists say they have found evidence for water vapour in the atmosphere of a 
planet 63 light-years from Earth.

The "hot Jupiter" planet's surface temperatures exceed 900C.

Writing in the journal Nature, the scientists say their discovery may help find 
planets that can support life.

In a separate study, the US space agency (Nasa) said that it had found carbon 
dioxide (CO2) in the atmosphere of the same planet.

Molten core

The planet known as HD 189733b is classed as a hot Jupiter due to its fiery 
molten centre and heavily gaseous atmosphere, which mimics the atmosphere of 
Jupiter, the gas giant in our own solar system.

The generation of heat by the planet's core provides the key to why scientists 
have been able to identify water vapour in its atmosphere.

Gases in the planet's atmosphere modify the wavelengths of heat radiation 
coming from the planet's hot surface. These wavelengths can be detected by 
space telescopes such as Hubble or the Sun-orbiting Spitzer telescope used in 
this study.

The type of gas present in the planet's atmosphere can be determined by looking 
at the spread of infrared radiation reaching the telescope, each gas producing 
a different wavelength.

Dr Drake Deming from Nasa's Goddard Space Flight Center, Maryland, US, has 
looked for signs of water on similar gas giants in the past. He says water 
vapour in the atmosphere leaves an unmistakeable signal.

"It produces a unique fingerprint, water vapour modulates the shape of the 
radiation in a very characteristic way," he said.

As the planet is so far away it is hard to determine how much of the radiation 
detected by the telescope comes from this gas giant and how much from the star 
it orbits.

The scientists solved this problem by studying its orbit.

"There is a time when we know the planet is not visible, so we know the light 
comes only from the star," says Dr Carl Grillmair from the Spitzer Science 
Center at the California Institute of Technology, who led the research.

They found HD 1897733b goes round its star every 2.2 days, by taking 
measurements over several orbiting cycles and deducting the radiation produced 
during the time when they couldn't see the planet - when it was behind its star 
- they were able to see how much radiation the planet emitted on its own.

"The key to these measurements is the eclipse geometry, we have a unique moment 
in which to observe the star in isolation," said Dr Deming.

Carbon Dioxide

The scientists were puzzled by earlier observations of HD 189733b and similar 
gas giants. They expected to see water vapour, but the telescopes did not 
detect any.

"We concluded there was no water a couple of years ago, the theoreticians were 
upset, they'd predicted it would be there. We didn't understand it. We looked 
much harder we watched it for over 120 hours, and sure enough there was the 
signature matching brilliantly with the models," said Dr Grillmair.

He suggests the planet's proximity to the star means its atmosphere is 
constantly changing.

"With planets this close to their star, the star covers perhaps half the 
planet, you're going to get enormous heat loads that create storms, perhaps 
clouds one year and none the next - this thing is changing right before our 
eyes" said Dr Grillmair.

The scientists suggest high clouds created by the storms may have hidden the 
water vapour in the earlier observations, they are confident that the latest 
findings are correct.

"What's new about this is it's unequivocal," says Dr Deming.

In a separate development, Nasa says the Hubble space telescope has detected 
carbon dioxide in HD189733's atmosphere.

Although the agency is keen to stress the planet is far too hot to support 
life, it says the finding represents an important proof of concept, showing 
that it is possible to detect CO2 in the atmospheres of distant planets 
orbiting other stars, and that the same method could be used to look at planets 
which might support life.

"The very fact we are able to detect it and estimate its abundance is 
significant for the long-term effort of characterising planets to find out what 
they are made of and if they could be a possible host for life," said Mark 
Swain, a research scientist at Nasa's Jet Propulsion Laboratory in Pasadena, 
California, who analysed the Hubble images.
Story from BBC NEWS:

Published: 2008/12/10 19:52:15 GMT


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