Astronomers discover new planet in Pisces constellation
A team led by SF State astronomer Stephen Kane has discovered a new
giant planet located in a star system within the Pisces constellation.
The planet, perhaps twice the mass of Jupiter, could help researchers
learn more about how extrasolar planets are formed.
The star system harbouring the new planet contains only one star, as
do the other three systems with extrasolar planets analysed by Kane, an
assistant professor of physics and astronomy, and his colleagues. It is
a surprising finding, given the high rate of multiple-star systems in
our solar neighbourhood.
"There is a great interest in these stars that are known to host
planets," Kane said, since astronomers suspect that planet formation in
a multi-star system would be very different from planet formation in a
single-star system like our own. Kane presented his findings at the
annual conference of the American Astronomical Society.
A multiple-star system "might have not one but two planetary disks"
where planets form, he said. "Or it could be that having an extra star
would be disruptive, and its gravity could cause any protoplanets to
pull apart."
Relatively few extrasolar planets have been found in multiple-star
systems, "but we know that they are there," Kane said.
In the four systems studied by the researchers, using optical imaging
data collected at the Gemini North observatory in Hawaii, there were
some intriguing signs that perhaps a second star - or something else -
was present.
In each system, the extrasolar planets were discovered by the radial
velocity technique, pioneered at SF State by astronomer Geoffrey Marcy,
now at the University of California, Berkeley. The radial velocity
technique measures variations in the speed at which a star moves away
and toward Earth, perturbed or "wobbled" by the gravitational pull of a
nearby cosmic body. Depending on the radial velocity signature,
astronomers can calculate whether the wobble is coming from a planet or
star.
In the star systems studied by Kane and his colleagues, there was a
part of the radial velocity data that couldn't be explained entirely by
the pull of an orbiting planet. And at the same time, the planets that
had already been discovered in these systems followed eccentric orbits,
swinging away from their stars in a less circular and more elliptical
fashion, "more like that of a comet," Kane said.
With these two clues, the researchers wondered if the radial velocity
and eccentric orbits might be explained by the presence of another star
in the system. But when they took a closer look at the systems, they
were able to rule out the possibility that another star was perturbing
the system.
- New Scientist |