Kepler News and Results

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Re: Kepler News and Results

Post by Stalker on 14th November 2012, 2:33 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 14th November 2012, 3:51 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 14th November 2012, 3:52 pm

Is it the smallest of all exoplanets?

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Re: Kepler News and Results

Post by Sirius_Alpha on 14th November 2012, 4:03 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 14th November 2012, 4:13 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 14th November 2012, 5:23 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 15th November 2012, 3:53 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 15th November 2012, 4:43 am

NASA's Kepler Wraps Prime Mission, Begins Extension

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Re: Kepler News and Results

Post by Sirius_Alpha on 15th November 2012, 11:21 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 15th November 2012, 1:51 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 15th November 2012, 6:47 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 16th November 2012, 2:50 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 11th December 2012, 2:30 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 15th December 2012, 5:07 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 15th December 2012, 3:08 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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Re: Kepler News and Results

Post by pochimax on 16th December 2012, 5:18 pm

Sirius_Alpha wrote:
Not quite. Transiting planet signals are individual transits. That number is a total number of transits detected, not individual transiting planets.

From this set of targets [stars] we find a total of 11,087 targets which contain at least one signal[...] When targets with multiple detections are considered, a total of 18,406 potential transiting planet signals are found

They are clearly talking about transiting planet candidates (more than 18 thousand in more than 11 thousand stars).

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Re: Kepler News and Results

Post by Kodas on 16th December 2012, 5:40 pm

There is a big difference between a potential planet signal and a published candidate. The identification of TCEs is the first step of the Kepler pipeline validation process, you cannot compare them with previously announced numbers of well-studied candidates.

The previous paper, http://arxiv.org/abs/1201.1048 , covered some of the earlier data and similarly there were thousands of TCEs but there were far fewer official candidates published from this period.

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Re: Kepler News and Results

Post by jyril on 17th December 2012, 4:32 am

That spurious spike around one year period is bad, really couldn't be in a worse position.

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Re: Kepler News and Results

Post by jyril on 17th December 2012, 4:36 am

According to the abstracts, the first two quarters yielded 5,392 TCEs and three years 18,406 TCEs. The number of detections have really slowed down, just as expected. Curious to know what the eventually published longer period candidates will turn out to be.

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Re: Kepler News and Results

Post by Lazarus on 21st December 2012, 7:37 pm

Fast rise of "Neptune-size" planets (4−8R) from P~10 to ~250 days Statistics of Kepler Planet Candidates up to ~0.75 AU
http://arxiv.org/abs/1212.4853

Frequency of Neptunes seems to increase rapidly out to longer orbital periods, in contrast to smaller planets ("super-Earths").

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Re: Kepler News and Results

Post by Daniel on 25th December 2012, 2:18 pm

Did anyone here know about this planetary System:

KIC 4862625

EPE entry: http://exoplanet.eu/catalog/kic_4862625_b/

A Gas Giant Circumbinary Planet Transiting an Evolved F Star Primary of the Eclipsing Binary Star KIC 4862625 and the Independent Discovery and Characterization of the two transiting planets in the Kepler-47 System

http://arxiv.org/pdf/1210.3850v1.pdf

Eyebrow

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Re: Kepler News and Results

Post by Sirius_Alpha on 25th December 2012, 2:29 pm

Daniel wrote:Did anyone here know about this planetary System:
Yes.

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Re: Kepler News and Results

Post by Daniel on 25th December 2012, 2:29 pm

Oh I got it this is the PH1=Kepler-64b

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Re: Kepler News and Results

Post by Daniel on 25th December 2012, 3:01 pm

I found this interesting video:

Exoplanet Characterization by Proxy for Kepler-61b: How a Nearby Star
Bumped a Planet Out of the Habitable Zone

https://webcast.astrosci.ca/1/watch/273.aspx

As we can see Kepler-61b is KOI 1361.01 but turn out the host star is not M dwarf,but K dwarf Star with similar spectrum of Groombridge 1618,them the planet is not in Habitable zone of Kepler-61

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Re: Kepler News and Results

Post by Led_Zep on 30th December 2012, 5:30 pm

The AAS 221 th meeting is coming soon (06-10 january)
These abstracts are listed as embarged -- Sirius Alpha

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Re: Kepler News and Results

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