COROT exoplanet hunt update (Forwarded)

ESA News
http://www.esa.int

21 May 2008

Exoplanet hunt update

Two new exoplanets and an unknown celestial object are the latest findings
of the COROT mission. These discoveries mean that the mission has now
found a total of four new exoplanets.

These results were presented this week at the IAU symposium 253 in
Massachusetts, USA.

COROT has now been operating for 510 days, and the mission started
observations of its sixth star field at the beginning of May this year.
During this observation phase, which will last 5 months, the spacecraft
will simultaneously observe 12 000 stars.

The two new planets are gas giants of the hot Jupiter type, which orbit
very close to their parent star and tend to have extensive atmospheres
because heat from the nearby star gives them energy to expand.

In addition, an oddity dubbed 'COROT-exo-3b' has raised particular
interest among astronomers. It appears to be something between a brown
dwarf, a sub-stellar object without nuclear fusion at its core but with
some stellar characteristics, and a planet. Its radius is too small for it
to be a super-planet.

If it is a star, it would be among the smallest ever detected. Follow-up
observations from the ground have pinned it at 20 Jupiter massses. This
makes it twice as dense as the metal Platinum.

Scientists suspect that with the detection of COROT-exo-3b, they might
just have discovered the missing link between stars and planets.

COROT has also detected extremely faint signals that, if confirmed, could
indicate the existence of another exoplanet, as small as 1.7 times Earth's
radius.

This is an encouraging sign in the delicate and difficult search for
small, rocky exoplanets that COROT has been designed for.

Note for editors:

COROT was launched atop the Soyuz from the Baikonour cosmodrome in
Kazakhstan on 27 December 2006. Settled in its almost-circular polar orbit
ranging between 895 and 906 km above Earth's surface, the spacecraft was
first powered on 2 January 2007 and started its science observations on 3
February of the same year.

COROT is a CNES project with ESA participation. The other major partners
in this mission are Austria, Belgium, Brazil, Germany and Spain.

For more information:

Malcolm Fridlund, ESA COROT Project Scientist
Email: Malcolm.Fridlund @ esa.int

[NOTE: Images and weblinks supporting this release are available at
http://www.esa.int/esaSC/SEM9E91YUFF_index_1.html ]


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