Bill
2005-07-15 08:00:22 UTC
Planet with three suns challenges astronomers
Thu Jul 14, 1:27 PM ET
In a scenario out of "Star Wars," astronomers have detected a planet outside
our solar system with not one, but three suns, a finding that challenges
astronomers' theories of planetary formation.
The planet, a gas giant slightly larger than Jupiter, orbits the main star of
a triple-star system known as HD 188753 in the constellation Cygnus ("The
Swan").
The stellar trio and its planet are about 149 light-years from Earth and about
as close to each other as our sun is to Saturn, U.S. scientists reported on
Thursday in the current edition of the journal Nature.
A light-year is about 6 trillion miles, the distance light travels in a year.
If you stood on the planet's surface, you would see three suns in sky,
although its orbit centers around the main yellow star among the trio. The
larger of the other two suns would be orange and the smaller would be red,
astronomers at California Institute of Technology said in a statement.
An artists' rendering of the planet and three stars, as seen from a
hypothetical moon, is available at
Loading Image...
.
The new finding could upset existing theories that planets usually form out of
gas and dust circling a single star, and could lead scientists to look in new
places for planets.
"The implication is that there are more planets out there than we thought,"
the commentary said.
Caltech astronomer Maciej Konacki, who wrote the research article, refers to
the new type of planets as "Tatooine planets," because of the similarity to
Luke Skywalker's view of his home planet by the same name, with its multiple
suns, in the original "Star Wars" film.
The fact that a planet can even exist in a multiple-star system is amazing in
itself, according to Konacki. Binary and multiple stars are quite common in
the solar neighborhood, and in fact outnumber single stars by some 20 percent.
But so far, most extrasolar planets -- those discovered outside our planetary
system -- have been detected by watching for a characteristic wobble in the
stars their orbit, reflecting the gravitation pull the planets exert on their
suns.
This method is less effective for binary and multiple star systems, and
existing theories said planets were unlikely to form in this kind of
environment.
Konacki found a new way to identify planets by measuring velocities of all
bodies in a binary or multiple star system.
Thu Jul 14, 1:27 PM ET
In a scenario out of "Star Wars," astronomers have detected a planet outside
our solar system with not one, but three suns, a finding that challenges
astronomers' theories of planetary formation.
The planet, a gas giant slightly larger than Jupiter, orbits the main star of
a triple-star system known as HD 188753 in the constellation Cygnus ("The
Swan").
The stellar trio and its planet are about 149 light-years from Earth and about
as close to each other as our sun is to Saturn, U.S. scientists reported on
Thursday in the current edition of the journal Nature.
A light-year is about 6 trillion miles, the distance light travels in a year.
If you stood on the planet's surface, you would see three suns in sky,
although its orbit centers around the main yellow star among the trio. The
larger of the other two suns would be orange and the smaller would be red,
astronomers at California Institute of Technology said in a statement.
An artists' rendering of the planet and three stars, as seen from a
hypothetical moon, is available at
Loading Image...
.The new finding could upset existing theories that planets usually form out of
gas and dust circling a single star, and could lead scientists to look in new
places for planets.
"The implication is that there are more planets out there than we thought,"
the commentary said.
Caltech astronomer Maciej Konacki, who wrote the research article, refers to
the new type of planets as "Tatooine planets," because of the similarity to
Luke Skywalker's view of his home planet by the same name, with its multiple
suns, in the original "Star Wars" film.
The fact that a planet can even exist in a multiple-star system is amazing in
itself, according to Konacki. Binary and multiple stars are quite common in
the solar neighborhood, and in fact outnumber single stars by some 20 percent.
But so far, most extrasolar planets -- those discovered outside our planetary
system -- have been detected by watching for a characteristic wobble in the
stars their orbit, reflecting the gravitation pull the planets exert on their
suns.
This method is less effective for binary and multiple star systems, and
existing theories said planets were unlikely to form in this kind of
environment.
Konacki found a new way to identify planets by measuring velocities of all
bodies in a binary or multiple star system.