Everyone Loves Fomalhaut

Astronomers have gotten pictures of an extrasolar planet! It's also nice to know that my warm feelings about Fomalhaut are widely shared.

Dr. Marois is the leader of a team that recorded three planets circling a star known as HR 8799 that is 130 light-years away in the constellation Pegasus. The other team, led by Paul Kalas of the University of California, Berkeley, found a planet orbiting the star Fomalhaut, only 25 light-years from Earth, in the constellation Piscis Austrinus....

The new planetary systems are anchored by young bright stars more massive than our own Sun and swaddled in large disks of dust, the raw material of worlds.

The three planets orbiting HR 8799 are roughly 10, 9 and 6 times the mass of Jupiter and orbit their star in periods of 450, 180 and 100 years respectively, all counterclockwise.

The Fomalhaut planet is about three times as massive as Jupiter, according to Dr. Kalas’s calculations, and is on the inner edge of a huge band of dust, taking roughly 872 years to complete a revolution of its star.

Both systems appear to be scaled-up versions of our own solar system, with giant planets in the outer reaches, leaving plenty of room for smaller planets to lurk undetected in the warmer inner regions. Dust rings lie even farther out, like the Kuiper belt of icy debris extending beyond the orbit of Neptune.

“This is a window into what our own solar system might have looked like when it was 60 million years old,” Dr. Marois said.

Sara Seager, a planetary theorist at the Massachusetts Institute of Technology, said it was significant that the planets in both cases seemed to be associated with disks of dust, particularly Fomalhaut, one of the brightest and closest stars known to be host to a massive disk.

“Fomalhaut is like a Hollywood star to astronomers, so we have some personal excitement here,” Dr. Seager said. “It feels like finding out that one of your four closest friends just won the lottery big time”

Something's a little off with using both those similes at once, but we get the idea.

Comments

[Jake]

Holy Crap! It appears they've also found the eye of Sauron!

[LizardBreath]

Hey, I heard this story and instantly thought that someone should write a song about it for you.

[Doug]

So we've only got to wait around a coupla billion years to see if life sprouts. Cool. Should we listen to Steely Dan the whole time?