Kepler finds red giants with rapidly spinning cores.
"An international team of astronomers led by PhD student Paul Beck from Leuven University in Belgium have managed to look deep inside some old stars and discovered that their cores spin at least ten times as fast as their surfaces. The result appeared today in the journal Nature.
It has been known for a long time that the surfaces of these stars spin slowly, taking about a whole year to complete one rotation. The team has now discovered that the cores at the heart of the stars spin much faster with about one rotation per month. The discovery was made possible because of the ultra high precision of the data from NASA's Kepler space telescope."
I just found this site that launched 4 days ago. The address is http://exoplanetarchive.ipac.caltech.edu/.
What is the NASA Exoplanet Archive?
The NASA Exoplanet Archive collects and serves public data to support the search for and characterization of extra-solar planets (exoplanets) and their host stars. The data include published light curves, images, spectra and parameters, and time-series data from surveys that aim to discover transiting exoplanets. Tools are provided to work with the data, particularly the display and analysis of transit data sets from Kepler and CoRoT. All data are validated by the Exoplanet Archive science staff and traced to their sources. The Exoplanet Archive is the U.S. data portal for the CoRoT mission.
It used to be the NASA Star and Exoplanet Database (NStED), it's just been overhauled to provide improved facility.
Has it been anounced at what time we will get the next results from the Kepler search? AFAIK the current search only includes the findings until summer of 2011 since the rest needs more processing time.
Neither of these rang a bell with me, but they illustrate the point.Really? Do you have a link for this? I've always found it interesting since i believe we some time in the future will find more moons with life than planets.
TrES-2b: Pushing Exomoon Limits
That's a good one, and here's a couple other good ones.Great site, thanks! Really didn't think anyone would release data on candidates since no one ever talked about their caractaristics other than the amount of candidates like the newly 1,000+ released candidates.
Kepler Planet Candidate Data Explorer
The Extrasolar Planets Encyclopaedia
Catalog of Exoplanets from the Planetary Society
Thanks for the links. Can't see where to find the candidates of the exoplanets though if that was what i was suppose to find it the provided links.
And confirmed planets just jumped from 28 to 33. All 5 orbit the same star, Kepler 20, G-type, with a system of 5 planets. They include Kepler 20 E and F, Earth-sized but probably uninhabitable. One is only 3% larger than Earth, the other smaller than both Earth and Venus. They don't have the means to measure the masses of these planets via radial velocity - yet. They are hopeful for the near future.
Last edited by Scriitor; 2011-Dec-20 at 06:26 PM.
Planets proceeding outwards from Kepler 20 are "Neptune-like, rocky, Neptune, rocky, Neptune", all very close. Within a Mercury orbit, I think was said, but I might have misheard. They're proposing this challenges all planet-formation theories. They're challenging the astronomical community to come up with a way how this alternating planetary sequence might have come about.
Last edited by Scriitor; 2011-Dec-20 at 06:43 PM.
Kepler 20F, closest to Earth-sized, is too hot to have water now, but apparently might have held it for "several billion years" previously. They are hopeful of finding a true Earth-twin within a year or two, but it might take an extended mission of 4-5 years, as sensitivity improves.
And yes, they are hopeful of detecting moons, but via gravity "wobble", not the visual transit method, except for possibly the smaller stars.
Last edited by Scriitor; 2011-Dec-20 at 06:57 PM.
At night the stars put on a show for free (Carole King)
All moderation in purple - The rules
I do not understand why no one remembered pulsar planets? i looked everywhere - forums, space portals, news, and nowhere this issue it talked about. So lets say this: "first ever planet smaller than Earth discovered in history" or other statements like this are pure **.
Two papers on Transit Timing Variations from the Kepler team:
arXiv:1201.1892 - Transit Timing Observations from Kepler: VI. Transit Timing Variation Candidates in the First Seventeen Months from Polynomial Models
arXiv:1201.1873 - Transit Timing Observations from Kepler: VII. Potentially interesting candidate systems from Fourier-based statistical tests
NASA's Kepler Mission Finds Three Smallest Exoplanets
Astronomers using data from NASA's Kepler mission have discovered the three smallest planets yet detected orbiting a star beyond our sun. The planets orbit a single star, called KOI-961, and are 0.78, 0.73 and 0.57 times the radius of Earth. The smallest is about the size of Mars.
All three planets are thought to be rocky like Earth but orbit close to their star, making them too hot to be in the habitable zone, which is the region where liquid water could exist. Of the more than 700 planets confirmed to orbit other stars, called exoplanets, only a handful are known to be rocky.
"Astronomers are just beginning to confirm the thousands of planet candidates uncovered by Kepler so far," said Doug Hudgins, Kepler program scientist at NASA Headquarters in Washington. "Finding one as small as Mars is amazing, and hints that there may be a bounty of rocky planets all around us."
Everything I need to know I learned through Googling.
I suppose given the duration so far of the Kepler mission that the earth sized(or smaller) planets detected are almost bound to be close to their stars?
AFAIK Kepler was supposed to be able to detect earth-sized planet in habitable zone of sun-like star within primary mission time, so not that close to star.
But there is one problem. Stars osciliate too much, more than expected, making measurements harder. So successfully confirmed detection of this kind of planet require mission extension.