Jun 19 2017
From The Space Library
RELEASE 17-056 NASA Releases Kepler Survey Catalog with Hundreds of New Planet Candidates
NASA’s Kepler space telescope team has released a mission catalog of planet candidates that introduces 219 new planet candidates, 10 of which are near-Earth size and orbiting in their star's habitable zone, which is the range of distance from a star where liquid water could pool on the surface of a rocky planet.
This is the most comprehensive and detailed catalog release of candidate exoplanets, which are planets outside our solar system, from Kepler’s first four years of data. It’s also the final catalog from the spacecraft’s view of the patch of sky in the Cygnus constellation.
With the release of this catalog, derived from data publically available on the NASA Exoplanet Archive, there are now 4,034 planet candidates identified by Kepler. Of which, 2,335 have been verified as exoplanets. Of roughly 50 near-Earth size habitable zone candidates detected by Kepler, more than 30 have been verified.
Additionally, results using Kepler data suggest two distinct size groupings of small planets. Both results have significant implications for the search for life. The final Kepler catalog will serve as the foundation for more study to determine the prevalence and demographics of planets in the galaxy, while the discovery of the two distinct planetary populations shows that about half the planets we know of in the galaxy either have no surface, or lie beneath a deep, crushing atmosphere – an environment unlikely to host life.
The findings were presented at a news conference Monday at NASA's Ames Research Center in California's Silicon Valley.
“The Kepler data set is unique, as it is the only one containing a population of these near Earth-analogs – planets with roughly the same size and orbit as Earth,” said Mario Perez, Kepler program scientist in the Astrophysics Division of NASA’s Science Mission Directorate. “Understanding their frequency in the galaxy will help inform the design of future NASA missions to directly image another Earth.”
The Kepler space telescope hunts for planets by detecting the miniscule drop in a star’s brightness that occurs when a planet crosses in front of it, called a transit.
This is the eighth release of the Kepler candidate catalog, gathered by reprocessing the entire set of data from Kepler’s observations during the first four years of its primary mission. This data will enable scientists to determine what planetary populations – from rocky bodies the size of Earth, to gas giants the size of Jupiter – make up the galaxy’s planetary demographics.
To ensure a lot of planets weren’t missed, the team introduced their own simulated planet transit signals into the data set and determined how many were correctly identified as planets. Then, they added data that appear to come from a planet, but were actually false signals, and checked how often the analysis mistook these for planet candidates. This work told them which types of planets were overcounted and which were undercounted by the Kepler team’s data processing methods.
“This carefully-measured catalog is the foundation for directly answering one of astronomy’s most compelling questions – how many planets like our Earth are in the galaxy?” said Susan Thompson, Kepler research scientist for the SETI Institute in Mountain View, California, and lead author of the catalog study.
One research group took advantage of the Kepler data to make precise measurements of thousands of planets, revealing two distinct groups of small planets. The team found a clean division in the sizes of rocky, Earth-size planets and gaseous planets smaller than Neptune. Few planets were found between those groupings.
Using the W. M. Keck Observatory in Hawaii, the group measured the sizes of 1,300 stars in the Kepler field of view to determine the radii of 2,000 Kepler planets with exquisite precision.
“We like to think of this study as classifying planets in the same way that biologists identify new species of animals,” said Benjamin Fulton, doctoral candidate at the University of Hawaii in Manoa, and lead author of the second study. “Finding two distinct groups of exoplanets is like discovering mammals and lizards make up distinct branches of a family tree.”
It seems that nature commonly makes rocky planets up to about 75 percent bigger than Earth. For reasons scientists don't yet understand, about half of those planets take on a small amount of hydrogen and helium that dramatically swells their size, allowing them to "jump the gap" and join the population closer to Neptune’s size.
The Kepler spacecraft continues to make observations in new patches of sky in its extended mission, searching for planets and studying a variety of interesting astronomical objects, from distant star clusters to objects such as the TRAPPIST-1 system of seven Earth-size planets, closer to home.
Ames manages the Kepler missions for NASA’s Science Mission Directorate. NASA's Jet Propulsion Laboratory in Pasadena, California, managed Kepler mission development. Ball Aerospace & Technologies Corporation operates the flight system with support from the Laboratory for Atmospheric and Space Physics at the University of Colorado in Boulder.
M17-074 Media Invited to Learn about NASA’s Project to Streamline Air Travel
Media are invited to watch a virtual presentation and briefing on NASA’s Airspace Technology Demonstration 2 (ATD-2) Integrated Arrival / Departure / Surface Metroplex Traffic Management System at 11:30 a.m. EDT on Thursday, June 22. The project aims to streamline the arrival and departure of aircraft and improve surface operations to increase safety and efficiency and reduce fuel use in our nation’s aviation system.
NASA, working with the Federal Aviation Administration (FAA) and private industry, is developing the technologies necessary to increase predictability of the air traffic systems, enhance operational efficiency, and improve travel across national, regional and local traffic management systems. ATD-2 will provide coordinated schedules between the ramp, tower, terminal and center control facilities, giving air traffic managers the tools necessary to make better decisions to reduce congestion.
In June 2016, NASA and its partners officially opened an ATD-2 laboratory at Charlotte Douglas International Airport as part of a five-year test project. NASA engineers have since used this laboratory to collaborate with FAA, air carrier and airport partners to prepare for the ATD-2 field demonstration scheduled to begin in October. At this time, the ATD-2 laboratory cannot support media visits, so the ATD-2 leadership has arranged this virtual opportunity to see the same data and tools that will be used in the field demonstration.
The virtual tour and presentation will take approximately 1.5 to 2 hours and will include a question and answer session. To participate, media should send an RSVP to J.D.Harrington@nasa.gov to receive log-in specifics.
ATD-2 will combine multiple concepts and technologies leveraging previous investments by NASA, the FAA and industry, including the FAA's three major operational decision support system technologies: Traffic Flow Management System, Time Based Flow Management and Terminal Flight Data Management.
