Kepler News and Results

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Re: Kepler News and Results

Post by Stalker on Wed Nov 14, 2012 1:33 pm

I have a question: what is the planet with the smallest transit dept detected by Kepler so far?

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Re: Kepler News and Results

Post by Sirius_Alpha on Wed Nov 14, 2012 2:51 pm

20 ppm according to this list.
http://archive.stsci.edu/kepler/planet_candidates.html

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Re: Kepler News and Results

Post by Stalker on Wed Nov 14, 2012 2:52 pm

Is it the smallest of all exoplanets?

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Re: Kepler News and Results

Post by Sirius_Alpha on Wed Nov 14, 2012 3:03 pm

You can use that site to check, you know. (You can sort by clicking on a column header)

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Re: Kepler News and Results

Post by Stalker on Wed Nov 14, 2012 3:13 pm

But it's not with all exoplanets, just kepler's one, is it?

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Re: Kepler News and Results

Post by Sirius_Alpha on Wed Nov 14, 2012 4:23 pm

Kepler has detected transit depths and planetary radii smaller than any other programme so far. A planet in the PSR B1257+12 system may be smaller, but with no radius measurement, it's hard to say.

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Re: Kepler News and Results

Post by Stalker on Thu Nov 15, 2012 2:53 am

Tanks you, but the one with 20 ppm is an unconfirmed candidate, the Keplers planet with the smallest transit depth seems to be kepler-33b with 61 ppm, no?

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Re: Kepler News and Results

Post by jyril on Thu Nov 15, 2012 3:43 am

NASA's Kepler Wraps Prime Mission, Begins Extension

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Re: Kepler News and Results

Post by Sirius_Alpha on Thu Nov 15, 2012 10:21 am

Stalker wrote:Tanks you, but the one with 20 ppm is an unconfirmed candidate, the Keplers planet with the smallest transit depth seems to be kepler-33b with 61 ppm, no?
That seems correct.

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Re: Kepler News and Results

Post by Lazarus on Thu Nov 15, 2012 12:51 pm

jyril wrote:NASA's Kepler Wraps Prime Mission, Begins Extension
So reading that link, the following stood out...

So far, hundreds of Earth-size planet candidates have been found, as well as candidates that orbit in the habitable zone, the region in a planetary system where liquid water might exist on the surface of a planet.
Interesting way of putting it, given...

Sirius_Alpha wrote:
Borucki at #dps12: there is not a single Earth-sized planet candidate in the habitable zone within the Kepler sample
https://twitter.com/ExoplanetApp

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Re: Kepler News and Results

Post by pochimax on Thu Nov 15, 2012 5:47 pm

Lazarus wrote:
So far, hundreds of Earth-size planet candidates have been found, as well as candidates that orbit in the habitable zone, the region in a planetary system where liquid water might exist on the surface of a planet.
Interesting way of putting it, given...

Sirius_Alpha wrote:
Borucki at #dps12: there is not a single Earth-sized planet candidate in the habitable zone within the Kepler sample
https://twitter.com/ExoplanetApp

NASA:
So far, hundreds of Earth-size planet candidates have been found as well as candidates that orbit in the habitable zone, the region in a planetary system where liquid water might exist on the surface of a planet. None of the candidates is exactly like Earth.

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Re: Kepler News and Results

Post by jyril on Fri Nov 16, 2012 1:50 am

The point was that the PR is somewhat misleading (well, after all it is a press release!): (1) there are hundreds of Earth-sized planets, and (2) there are candidates in the HZ; what they didn't say that these two sets don't overlap...

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Re: Kepler News and Results

Post by Lazarus on Tue Dec 11, 2012 1:30 pm

On The Relative Sizes of Planets Within Kepler Multiple Candidate Systems
http://arxiv.org/abs/1212.1859

More properties of planetary system architecture...

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Re: Kepler News and Results

Post by pochimax on Sat Dec 15, 2012 4:07 am

Detection of Potential Transit Signals in the First Twelve Quarters of Kepler Mission Data

http://arxiv.org/abs/1212.2915

More than 18 thousand candidate planets. Incredible. In my opinion between 25 and 50 percent could be false positives.

The worst, almost 90 percent of candidates within 300-400 days period, will be false positives related to the yearly rotation of the spacecraft (some stars fall in bad pixels yearly frequently)

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Re: Kepler News and Results

Post by Sirius_Alpha on Sat Dec 15, 2012 2:08 pm

pochimax wrote:More than 18 thousand candidate planets. Incredible.
Not quite. Transiting planet signals are individual transits. That number is a total number of transits detected, not individual transiting planets. Specifically, see this sentence from the abstract:
The detected signals are compared to a set of known transit events in the Kepler field of view, many of which were identified by alternative methods; the comparison shows that the current search recovery rate for targets with known transit events is 98.3%.

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