NASA's Kepler Discovers Multiple Planets Orbiting A Pair Of Stars | Aero-News Network
Aero-News Network
RSS icon RSS feed
podcast icon MP3 podcast
Subscribe Aero-News e-mail Newsletter Subscribe

** Airborne/NBAA2014 10.24.14 ** HD iPad-Friendly -- Airborne/NBAA2014 10.24.14 **
** Airborne/NBAA2014 10.22.14 ** HD iPad-Friendly -- Airborne/NBAA2014 10.22.14 **
** Airborne/NBAA2014 10.21.14 ** HD iPad-Friendly -- Airborne/NBAA2014 10.21.14 **
** Airborne/NBAA2014 10.20.14 ** HD iPad-Friendly -- Airborne/NBAA2014 10.20.14 **

Tue, Sep 04, 2012

NASA's Kepler Discovers Multiple Planets Orbiting A Pair Of Stars

First Time Planets 'Seen' Orbiting Two Suns

NASA's Kepler mission has discovered multiple transiting planets orbiting two suns for the first time. The system, known as a circumbinary planetary system, is 4,900 light-years from Earth in the constellation Cygnus. Coming less than a year after the announcement of the first circumbinary planet, Kepler-16b, this discovery proves that more than one planet can form and persist in the stressful realm of a binary star. The discovery demonstrates the diversity of planetary systems in our galaxy.

Astronomers detected two planets in the Kepler-47 system, a pair of orbiting stars that eclipse each other every 7.5 days from our vantage point on Earth. One star is similar to the sun in size, but only 84 percent as bright. The second star is diminutive, measuring only one-third the size of the sun and less than 1 percent as bright. "In contrast to a single planet orbiting a single star, the planet in a circumbinary system must transit a 'moving target.' As a consequence, time intervals between the transits and their durations can vary substantially, sometimes short, other times long," said Jerome Orosz, associate professor of astronomy at San Diego State University and lead author of the paper. "The intervals were the telltale sign these planets are in circumbinary orbits."

The inner planet, Kepler-47b, orbits the pair of stars in less than 50 days. While it cannot be directly viewed, it is thought to be a sweltering world, where the destruction of methane in its super-heated atmosphere might lead to a thick haze that could blanket the planet. At three times the radius of Earth, Kepler-47b is the smallest known transiting circumbinary planet. The outer planet, Kepler-47c, orbits its host pair every 303 days, placing it in the so-called "habitable zone," the region in a planetary system where liquid water might exist on the surface of a planet. While not a world hospitable for life, Kepler-47c is thought to be a gaseous giant slightly larger than Neptune, where an atmosphere of thick bright water-vapor clouds might exist.

"Unlike our sun, many stars are part of multiple-star systems where two or more stars orbit one another. The question always has been -- do they have planets and planetary systems? This Kepler discovery proves that they do," said William Borucki, Kepler mission principal investigator at NASA's Ames Research Center in Moffett Field, Calif. "In our search for habitable planets, we have found more opportunities for life to exist."

To search for transiting planets, the research team used data from the Kepler space telescope, which measures dips in the brightness of more than 150,000 stars. Additional ground-based spectroscopic observations using telescopes at the McDonald Observatory at the University of Texas at Austin helped characterize the stellar properties. The findings are published in the journal Science. "The presence of a full-fledged circumbinary planetary system orbiting Kepler-47 is an amazing discovery," said Greg Laughlin, professor of Astrophysics and Planetary Science at the University of California in Santa Cruz. "These planets are very difficult to form using the currently accepted paradigm, and I believe that theorists, myself included, will be going back to the drawing board to try to improve our understanding of how planets are assembled in dusty circumbinary disks."

(NASA image)

FMI: www.nasa.gov/kepler

Advertisement

More News

Airborne 10.24.14: AML's Innovations, NASA Preps For Mars, LightHawk Saves

Also: AW609 Pilots Honored, Airbus' VIP Cabin, FreeFlight's FTX-200, Quicksilver S-LSA Milestone During our visit this week to NBAA 2014, Jim Campbell had a chance to talk with Mar>[...]

Airborne at NBAA-10.22.14: Legacy 500, Universal InSight, BendixKing AeroWave

Also: GE Honda, Sagem's Active SideStick, Syberjet Update, Techno Aerospace Knows How to Party The FAA handed over certification papers for Embraer's Legacy 500 executive jet durin>[...]

Airborne 10.24.14: AML's Innovations, NASA Preps For Mars, LightHawk Saves

Also: AW609 Pilots Honored, Airbus' VIP Cabin, FreeFlight's FTX-200, Quicksilver S-LSA Milestone During our visit this week to NBAA 2014, Jim Campbell had a chance to talk with Mar>[...]

AD: Pacific Aerospace Limited Airplanes

AD NUMBER: 2014-21-02 PRODUCT: Pacific Aerospace Limited Model FU24-954 and FU24A-954 airplanes.>[...]

ANN's Daily Aero-Linx (10.25.14)

The Canard Zone An online forum by and for owners and builders of canard aircraft.>[...]

blog comments powered by Disqus



Advertisement

Advertisement

Podcasts

Advertisement

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