Image of the day

From the
ATWB Customer Gallery

North American & Pelican Nebulae

My Account

New to Astromart?

Register an account...

Need Help?

NASA's Kepler Marks 1000th Verified Exoplanet Discovery

01/07/2015 08:19AM

NASA's Kepler Marks 1000th Verified Exoplanet Discovery
How many stars like our sun host planets like our Earth? NASA's Kepler Space Telescope continuously monitored more than 150,000 stars beyond our solar system, and to date has offered scientists an assortment of more than 4000 candidate planets for further study -- the 1000th of which was recently verified.

Using Kepler data, scientists reached this 1000-point milestone after validating that eight more candidates spotted by the planet-hunting telescope are, in fact, planets. The Kepler team also has added another 554 candidates to the roll of potential planets, six of which are near-Earth size and orbit in the habitable zone of stars similar to our sun.

Three of the newly validated planets are located in their distant suns' habitable zone, the range of distances from the host star where liquid water might exist on the surface of an orbiting planet. Of the three, two are likely made of rock, like Earth.

"Each result from the planet hunting Kepler mission's treasure trove of data takes us another step closer to answering the question of whether we are alone in the Universe," said John Grunsfeld, associate administrator of NASA's Science Mission Directorate in Washington. "The Kepler team and its science community continue to produce impressive results with the data from this venerable explorer."

To determine whether a planet is made of rock, water, or gas, scientists must know its size and mass. When its mass can't be directly determined, scientists can infer what the planet is made of based on its size.

Two of the newly validated planets, Kepler-438b and Kepler-442b, are less than 1.5 times the diameter of Earth. Kepler-438b, which is 475 light years away, is 12 percent bigger than Earth and orbits its star once every 35.2 days. Kepler-442b, which is 1100 light years away, is 33 percent bigger than Earth and orbits its star once every 112 days.

Both Kepler-438b and Kepler-442b orbit stars smaller and cooler than our sun, making the habitable zone closer to their parent star, which is located near the constellation Lyra.

"With each new discovery of these small, possibly rocky worlds, our confidence strengthens in the determination of the true frequency of planets like Earth," said Doug Caldwell, SETI Institute Kepler scientist at NASA's Ames Research Center in California. "The day is on the horizon when we'll know how common temperate, rocky planets like Earth are."

With the detection of 554 more planet candidates from Kepler observations conducted from May 2009 to April 2013, the Kepler team has raised the candidate count to 4175. Eight of these new candidates are between one to two times the size of Earth, and orbit in their sun's habitable zone. Of these eight, six orbit stars that are similar to our sun in size and temperature. All candidates require follow-up observations and analysis to verify that they are actual planets.

"Kepler collected data for four years -- long enough that we can now tease out the Earth size candidates in one Earth-year orbits," said Fergal Mullally, SETI Institute Kepler scientist at Ames who led the analysis of a new candidate catalog. "We're closer than we've ever been to finding Earth twins around other sun-like stars. These are the planets we're looking for."

Work is underway to translate these recent discoveries into estimates of how often rocky planets appear in the habitable zones of stars like our sun, a key step toward NASA's goal of understanding our place in the universe.




Destination Innovation - Kepler (Video Credit: NASA)


Scientists also are working on the next catalog release of Kepler's four year data set. The analysis will include the final month of data collected by the mission and also will be conducted using sophisticated software that is more sensitive to the tiny telltale signatures of small Earth-size planets than software used in the past.


For more information:

http://www.nasa.gov/press/2015/january/nasa-s-kepler-marks-1000th-exoplanet-discovery-uncovers-more-small-worlds-in/index.html#.VK1PdCxH5c8

http://www.astromart.com/news/news.asp?news_id=1412

http://www.astromart.com/news/news.asp?news_id=1320

http://www.astromart.com/news/news.asp?news_id=1108

http://www.astromart.com/news/news.asp?news_id=1025

http://www.astromart.com/news/news.asp?news_id=926

http://www.astromart.com/news/news.asp?news_id=852


AstroMart News Archive:

http://www.astromart.com/news/search.asp?search=.+