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 Unlimited -- Most Recent Daily Episodes

Episode Date

Airborne-Monday

Airborne-Tuesday

Airborne-Wednesday Airborne-Thursday

Airborne-Friday

Airborne On YouTube

Airborne-Unlimited-04.22.24

Airborne-Unlimited-04.16.24

Airborne-FlightTraining-04.17.24 Airborne-AffordableFlyers-04.18.24

Airborne-Unlimited-04.19.24

Join Us At 0900ET, Friday, 4/10, for the LIVE Morning Brief.
Watch It LIVE at
www.airborne-live.net

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

Airbus Racer Helicopter Demonstrator First Flight Part of Clean Sky 2 Initiative

Airbus Racer Demonstrator Makes Inaugural Flight Airbus Helicopters' ambitious Racer demonstrator has achieved its inaugural flight as part of the Clean Sky 2 initiative, a corners>[...]

Diamond's Electric DA40 Finds Fans at Dübendorf

A little Bit Quieter, Said Testers, But in the End it's Still a DA40 Diamond Aircraft recently completed a little pilot project with Lufthansa Aviation Training, putting a pair of >[...]

ANN's Daily Aero-Term (04.23.24): Line Up And Wait (LUAW)

Line Up And Wait (LUAW) Used by ATC to inform a pilot to taxi onto the departure runway to line up and wait. It is not authorization for takeoff. It is used when takeoff clearance >[...]

NTSB Final Report: Extra Flugzeugbau GMBH EA300/L

Contributing To The Accident Was The Pilot’s Use Of Methamphetamine... Analysis: The pilot departed on a local flight to perform low-altitude maneuvers in a nearby desert val>[...]

Classic Aero-TV: 'Never Give Up' - Advice From Two of FedEx's Female Captains

From 2015 (YouTube Version): Overcoming Obstacles To Achieve Their Dreams… At EAA AirVenture 2015, FedEx arrived with one of their Airbus freight-hauling aircraft and placed>[...]

blog comments powered by Disqus



Advertisement

Advertisement

Podcasts

Advertisement

© 2007 - 2024 Web Development & Design by Pauli Systems, LC