Not all free-floating planets were thrown out of existing planetary systems but they can also be born free,
according to new observations made by a team of astronomers from Sweden and Finland using
Chalmers University of Technology telescopes.
Until now scientists have believed that such “rogue planets”, which don’t orbit around a
star, must have been ejected from existing planetary systems.
New observations of tiny dark clouds in space point out another possibility: that some free-floating
planets formed on their own.
Click on image to enlarge
Astronomers have found that tiny, round, dark clouds called globulettes have the right
characteristics to form free-floating planets. The graph shows the spectrum of one of the globulettes taken at
the 20-metre telescope at Onsala Space Observatory. Radio waves from molecules of carbon monoxide (13CO) give
information on the mass and structure of these clouds. ESO/M. MäkeläCredits: http://www.chalmers.se
A team of astronomers from Sweden and Finland have observed the Rosette Nebula, a huge
cloud of gas and dust 4600 light years from Earth in the constellation Monoceros (the Unicorn).
They collected observations in radio waves with the 20-metre telescope at Onsala Space Observatory in Sweden,
in submillimetre waves with APEX in Chile, and in infrared light with the New Technology Telescope (NTT) at
ESO’s La Silla Observatory in Chile.
”The Rosette Nebula is home to more than a hundred of these tiny clouds – we call them globulettes”, says
Gösta Gahm, astronomer at Stockholm University, who led the project.
“They are very small, each with diameter less than 50 times the distance between the Sun and Neptune.
Previously we were able to estimate that most of them are of planetary mass, less than 13 times Jupiter’s
"Now we have much more reliable measures of mass and density for a large number of these objects, and
we have also precisely measured how fast they are moving relative to their environment”, he says.
“We found that the globulettes are very dense and compact, and many of them have very dense cores. That
tells us that many of them will collapse under their own weight and form free-floating planets. The most massive
of them can form so-called brown dwarfs”, says team member Carina Persson, astronomer at Chalmers University of
Brown dwarfs, sometimes called failed stars, are bodies whose mass lies between that of planets and stars.
The study shows that the tiny clouds are moving outwards through the Rosette Nebula at high speed, about
80 000 kilometres per hour.
Click on image to enlarge
”We think that these small, round clouds have broken off from tall, dusty pillars of gas which were sculpted
by the intense radiation from young stars. They have been accelerated out from the centre of the nebula thanks
to pressure from radiation from the hot stars in its centre”, explains Minja Mäkelä, astronomer at the University
According to Gösta Gahm and his team, the tiny dark clouds are being thrown out of the Rosette Nebula. During the
history of the Milky Way, countless millions of nebulae like the Rosette have bloomed and faded away. In all of
these, many globulettes would have formed.
“If these tiny, round clouds form planets and brown dwarfs, they must be shot out like bullets into the depths
of the Milky Way”, says Gösta Gahm.
“There are so many of them that they could be a significant source of the free-floating planets that have been
discovered in recent years”, he says.
Scientists have estimated that the number of free-floating planets in our galaxy may exceed 200 billion.
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