Posted on 07/18/2016 10:38:40 AM PDT by Red Badger
Image montage showing the Maunakea Observatories, Kepler Space Telescope, and night sky with K2 Fields and discovered planetary systems (dots) overlaid. An international team of scientists discovered more than 100 planets based on images from Kepler operating in the 'K2 Mission'. The team confirmed and characterized the planets using a suite of telescopes worldwide, including four on Maunakea (the twin telescopes of Keck Observatory, the GeminiNorth Telescope, and the Infrared Telescope Facility). The planet image on the right is an artist's impression of a representative planet. Credit: Karen Teramura (UHIfA) based on night sky image of the ecliptic plane by MiloslavDruckmüller and Shadia Habbal, and Kepler Telescope and planet images by NASA.
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An international team of astronomers have discovered and confirmed a treasure trove of new worlds. The researchers achieved this extraordinary discovery of exoplanets by combining NASA's K2 mission data with follow-up observations by Earth-based telescopes including the W. M. Keck Observatory on Maunakea, the twin Gemini telescopes on Maunakea and in Chile, the Automated Planet Finder of the University of California Observatories and the Large Binocular Telescope operated by the University of Arizona. The team confirmed more than 100 planets, including the first planetary system comprising four planets potentially similar to Earth. The discoveries are published online in The Astrophysical Journal Supplement Series.
Ironically, the bounty was made possible when the Kepler space telescope's pointing system broke.
In its initial mission, Kepler surveyed a specific patch of sky in the northern hemisphere, measuring the frequency with which planets whose sizes and temperatures are similar to Earth occur around stars like our sun. But when it lost its ability to precisely stare at its original target area in 2013, engineers created a second life for the telescope that is proving remarkably fruitful.
The new mission, dubbed K2, has provided the capability of observing a series of independent target fields in the ecliptic plane with greater opportunities for Earth-based observatories in both the northern and southern hemispheres. Additionally, in contrast to the Kepler mission, K2 is an entirely community-driven mission with all targets proposed for by the scientific community. K2 now looks at a larger fraction of cooler, smaller, red dwarf-type stars, which are much more common in our Milky Way than sun-like stars.
"Kepler's original mission observed a small patch of sky as it was designed to conduct a demographic survey of the different types of planets," said Ian Crossfield, a Sagan Fellow at the University of Arizona's Lunar and Planetary Laboratory, who led the research effort. "This approach effectively meant that relatively few of the brightest, closest red dwarfs were included in Kepler's survey. The K2 mission allows us to increase the number of small, red stars by a factor of 20 for further study."
One of the most interesting set of planets discovered in this study is a system of four potentially rocky planets, between 20 and 50 percent larger than Earth, orbiting a star less than half the size and with less light output than the Sun. Their orbital periods range from five-and-a-half to 24 days, and two of them may experience radiation levels from their star comparable to those on Earth.
Despite their tight orbits—closer than Mercury's orbit around the sun—the possibility that life could arise on a planet around such a star cannot be ruled out, according to Crossfield.
"Because these smaller stars are so common in the Milky Way, it could be that life occurs much more frequently on planets orbiting cool, red stars rather than planets around stars like our sun," Crossfield said.
To validate candidate planets identified by K2, the researchers obtained high-resolution images of the planet-hosting stars from Keck Observatory's near infrared camera (NIRC2), the Gemini and Large Binocular Telescope (among others) as well as high-resolution optical spectroscopy using Keck Observatory's high resolution spectrograph (HIRES) instrument and the AUtomated Planet Finder. By dispersing the starlight, the spectrographs allowed the researchers to measure the physical properties of a star—such as mass, radius and temperature—and infer the properties of any planets orbiting it.
"Our analysis shows that by the end of the K2 mission, we expect to double or triple the number of relatively small planets orbiting nearby, bright stars," Crossfield said. "And because these planets orbit brighter stars, we'll be able to more easily study everything possible about them, whether it's measuring their masses with Doppler spectroscopy—already underway at Keck Observatory and APF—or measuring their atmospheric makeup with the James Webb Space Telescope in just a few years."
The W. M. Keck Observatory operates the largest, most scientifically productive telescopes on Earth. The two, 10-meter optical/infrared telescopes near the summit of Maunakea on the Island of Hawaii feature a suite of advanced instruments including imagers, multi-object spectrographs, high-resolution spectrographs, integral-field spectrographs and world-leading laser guide star adaptive optics systems.
NIRC2 (the Near-Infrared Camera, second generation) works in combination with the Keck II adaptive optics system to obtain very sharp images at near-infrared wavelengths, achieving spatial resolutions comparable to or better than those achieved by the Hubble Space Telescope at optical wavelengths. NIRC2 is probably best known for helping to provide definitive proof of a central massive black hole at the center of our galaxy. Astronomers also use NIRC2 to map surface features of solar system bodies, detect planets orbiting other stars, and study detailed morphology of distant galaxies.
HIRES (the High-Resolution Echelle Spectrometer) produces spectra of single objects at very high spectral resolution, yet covering a wide wavelength range. It does this by separating the light into many "stripes" of spectra stacked across a mosaic of three large CCD detectors. HIRES is famous for finding planets orbiting other stars. Astronomers also use HIRES to study distant galaxies and quasars, finding clues to the Big Bang.
Explore further: Scientists directly image brown dwarf for the first time at Keck Observatory
More information: "197 Candidates and 104 Validated Planets in K2's First Five Fields," www.lpl.arizona.edu/~ianc/docs/crossfield_K2s_new_planets.pdf
X-O-Planet Ping!.........................
“Ironically, the bounty was made possible when the Kepler space telescope’s pointing system broke.
In its initial mission, Kepler surveyed a specific patch of sky in the northern hemisphere, measuring the frequency with which planets whose sizes and temperatures are similar to Earth occur around stars like our sun. But when it lost its ability to precisely stare at its original target area in 2013, engineers created a second life for the telescope that is proving remarkably fruitful. “
Awesome!
I always hated that it was designed to only point in one direction. It seemed like it was a potential waste to not just find as many as possible in other parts of the sky.
Anyone not surprised?
Me............................
cool
Shiny
Science has brought nothing but a series of demotions.
No reason to expect otherwise.
And tidy.
Unfortunately, the original problem still stands... how do we reach them?
To me this process seems pointless when we aren’t devoting enough time to space travel. The spirit of European explorers and American pioneers needs to be tapped into again so we can get people out there traveling to see what is really out there instead of just theorizing and making a best guess.
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"Demotions"? Of whom? Ego-powered primitives who want to insist that they are the central (if not only) intelligent organisms in the universe?
Such hubris literally begs for "demotion"...
Those observatories look like they are filming Mystery Science Theatre 3000.
Freegards
The explorers had to plan over decades. To reach other stars we will have to plan over hundreds and maybe thousands of years minimum, multi generationally. Hard to imagine when you think about the changes that have only occurred in the last 200 years. Some think we will launch something to somewhere and 100 years in halfway to target it will be just passed or picked up by something newer and much faster that we just sent.
Freegards
Unless and until there is found a way around the Speed Limit of the Universe, AKA the Speed of Light, space travel will remain the stuff of Sci-Fi novels and movies.
Not saying is impossible, just difficult....................
Mystery Science Theater 2016........................
demotions from what?...................
This explains how the planets were arranged. Really........
https://www.youtube.com/watch?v=yo9eSzqn2yI
At one time we thought:
The world ended at the horizon.
The sun orbited our planet.
We had a monopoly on intelligence.
Planets only orbited the sun.
There is only one galaxy.
etc.
As for the speed of light:
There’s a proposal to use existing technology to send objects away at 0.3C So our children may get to see some of these planets up close.
However, if we want a desirable place to “raise” the kids, other than right here; we will have to build it ourselves, within this solar system.
If warp drive was invented tomorrow, by next week people would leave to get away from our crappy government...
The ones who could afford to leave mostly ARE our crappy government.
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