Astronomers Discover Beginnings of 'Mini' Solar System | Aero-News Network
Aero-News Network
RSS icon RSS feed
podcast icon MP3 podcast
Subscribe Aero-News e-mail Newsletter Subscribe

** Airborne 09.29.14 ** HD iPad-Friendly -- Airborne 09.29.14**
** Airborne 09.26.14 ** HD iPad-Friendly -- Airborne 09.26.14 **
** Airborne 09.24.14 ** HD iPad-Friendly -- Airborne 09.24.14 **

Thu, Feb 10, 2005

Astronomers Discover Beginnings of 'Mini' Solar System

Planets Circling Other Planets?

Moons circle planets, and planets circle stars. Now, astronomers have learned that planets may also circle celestial bodies almost as small as planets.

NASA's Spitzer Space Telescope has spotted a dusty disc of planet-building material around an extraordinarily low-mass brown dwarf, or "failed star." The brown dwarf, called OTS 44, is only 15 times the mass of Jupiter. Previously, the smallest brown dwarf known to host a planet-forming disc was 25 to 30 times more massive than Jupiter.

The finding will ultimately help astronomers better understand how and where planets – including rocky ones resembling our own – form.

"There may be a host of miniature solar systems out there, in which planets orbit brown dwarfs," said Dr. Kevin Luhman, lead author of the new study from the Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass. "This leads to all sorts of new questions, like 'Could life exist on such planets?' or 'What do you call a planet circling a planet-sized body? A moon or a planet?'"

Brown dwarfs are something of misfits in the astronomy world. These cool orbs of gas have been called both failed stars and super planets. Like planets, they lack the mass to ignite and produce starlight. Like stars, they are often found alone in space, with no parent body to orbit.

"In this case, we are seeing the ingredients for planets around a brown dwarf near the dividing line between planets and stars. This raises the tantalizing possibility of planet formation around objects that themselves have planetary masses," said Dr. Giovanni Fazio, an astronomer at the Harvard Smithsonian Center for Astrophysics and a co-author of the new study.

The results were presented today at the Planet Formation and Detection meeting at the Aspen Center for Physics, Aspen, CO, and will be published in the Feb. 10th issue of The Astrophysical Journal Letters.

Planet-forming, or protoplanetary, discs are the precursors to planets. Astronomers speculate that the disc circling OTS 44 has enough mass to make a small gas giant planet and a few Earth-sized, rocky ones. This begs the question: Could a habitable planet like Earth sustain life around a brown dwarf?

"If life did exist in this system, it would have to constantly adjust to the dwindling temperatures of a brown dwarf," said Luhman. "For liquid water to be present, the planet would have to be much closer to the brown dwarf than Earth is to our Sun."

"It's exciting to speculate about the possibilities for life in such as system, of course at this point we are only beginning to understand the unusual circumstances under which planets arise," he added.

Brown dwarfs are rare and difficult to study due to their dim light. Though astronomers recently reported what may be the first-ever image of a planet around a brown dwarf called 2M1207, not much is understood about the planet-formation process around these odd balls of gas. Less is understood about low-mass brown dwarfs, of which only a handful are known.

OTS 44 was first discovered about six months ago by Luhman and his colleagues using the Gemini Observatory in Chile. The object is located 500 light-years away in the Chamaeleon constellation. Later, the team used Spitzer's highly sensitive infrared eyes to see the dim glow of OTS 44's dusty disc. These observations took only 20 seconds. Longer searches with Spitzer could reveal discs around brown dwarfs below10 Jupiter masses.

Other authors of this study include Dr. Paola D'Alessia of the Universidad Nacional Autonoma de Mexico; and Drs. Nuria Calvet, Lori Allen, Lee Hartmann, Thomas Megeath and Philip Myers of the Harvard-Smithsonian Center for Astrophysics.

FMI: www.spitzer.caltech.edu

Advertisement

More News

Airborne 09.29.14: Young Eagle Tragedy, Overdue Hoover Honors, Paperplane Record

Also: Low-Flying F16, UAVs For The Movie, Aerobatic Pilot Bails Out, Bombardier Safety Stand Down, MVP Takes On The World We are sad to report that a Young Eagle flight went down o>[...]

Airborne 09.29.14: Young Eagle Tragedy, Overdue Hoover Honors, Paperplane Record

Also: Low-Flying F16, UAVs For The Movie, Aerobatic Pilot Bails Out, Bombardier Safety Stand Down, MVP Takes On The World We are sad to report that a Young Eagle flight went down o>[...]

Airborne 09.26.14: A320neo First Flight, Aspen ESV Trial, Garmin Flies G5000

Also: Sea Lynx Grounding, AEA's Ric Peri On FAR 145, Union v Allegiant, Wingboarding--Anyone? Things went off as planned in Toulouse, France yesterday morning when the A320neo made>[...]

ANN's Daily Aero-Linx (09.30.14)

DOT Rule for Passengers Traveling with Lithium Batteries The issue has come to the forefront as more people may soon begin traveling with small UAVs, most of which are powered by t>[...]

ANN's Daily Aero-Term (09.30.14): Filed En Route Delay

Any of the following preplanned delays at points/areas along the route of flight which require special flight plan filing and handling techniques.>[...]

blog comments powered by Disqus



Advertisement

Advertisement

Podcasts

Advertisement

© 2007 - 2014 Web Development & Design by Pauli Systems, LC