Kepler News and Results (Thread 2)

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Re: Kepler News and Results (Thread 2)

Post by Edasich on 3rd November 2013, 12:33 pm

I also note that PH1 b has been merged with previous KIC identifier at last, although the catalog entry sounds a bit "awkward":

http://exoplanet.eu/catalog/ph1_b_equal_kepler-64_b/
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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 4th November 2013, 4:08 pm

22±8% of sun-like stars have an Earth-sized planet in the habitable zone.
http://www.ifa.hawaii.edu/info/press-releases/HabitablePlanetsCommon/

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Re: Kepler News and Results (Thread 2)

Post by Led_Zep on 4th November 2013, 4:13 pm

http://arxiv.org/abs/1311.0248

Detection of Potential Transit Signals in Sixteen Quarters of Kepler Mission Data

We present the results of a search for potential transit signals in four years of photometry data acquired by the Kepler Mission. The targets of the search include 111,800 stars which were observed for the entire interval and 85,522 stars which were observed for a subset of the interval. We observed that 9,743 targets contained at least one signal consistent with the signature of a transiting planet, where the criteria for detection are periodicity of the detected transits, adequate signal-to-noise ratio, and acceptance by a number of tests which reject false positive detections. When targets that had produced a signal were searched repeatedly, an additional 6,542 signals were detected on 3,223 target stars, for a total of 16,285 potential transiting planet signatures. Comparison of the set of detected signals with a set of known and vetted transit events in the Kepler field of view shows that the recovery rate for these signals is 97.0%. The ensemble properties of the detected signals are reviewed

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Re: Kepler News and Results (Thread 2)

Post by pochimax on 5th November 2013, 8:23 am

Sirius_Alpha wrote:22±8% of sun-like stars have an Earth-sized planet in the habitable zone.
http://www.ifa.hawaii.edu/info/press-releases/HabitablePlanetsCommon/
Lots of big news in the newspapers.

The problem is that truly earths, in a conservative point of view, are only earth size plus or minus 20% in diameter. Superearths are not earths, at least for the moment.

Also very broad, the irradiance calculation. Sure you boys have a differente point of view, about this claim.

In my point of view, the true occurrence of earth analogs will be only 2-4 percent, in FGK stars, from the published results.
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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 5th November 2013, 4:47 pm

From the UC Berkeley website
The team’s definition of habitable is that a planet receives between four times and one-quarter the amount of light that Earth receives from the sun.
I would be interested to know what motivated this choice of HZ definition - hopefully the paper gives a good justification for it. Or is it to get a pleasingly large number for the headlines? Rolling Eyes
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Re: Kepler News and Results (Thread 2)

Post by tommi59 on 6th November 2013, 4:24 am

4 times earth can not be habitable unless highly advancrd spieces live there


Last edited by tommi59 on 9th November 2013, 5:46 pm; edited 2 times in total
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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 9th November 2013, 4:48 pm

Ah ha, the PNAS link appears to be working now. Paper is currently available for free download:

Petigura et al. (2013) "Prevalence of Earth-size planets orbiting Sun-like stars"
http://www.pnas.org/content/early/2013/10/31/1319909110.abstract

It looks like the factor of 4 is a compromise position between the extreme inner-edge prediction of Zsom et al. (2013), under which Mercury would be skirting the inner edge of the HZ, and the extreme outer edge prediction of Pierrehumbert and Gaidos (2011), under which the outer edge would be located out near Saturn.

Regarding these predictions, I find the inner edge extension for dry terrestrial planets to be somewhat dubious (it can support water by virtue of not having water... er, great), and the outer extension is for planets with hydrogen-rich atmospheres, which perhaps is in conflict with the upper radius cut of the planets considered.

Occurrence rate for the Kopparapu et al. (2013) HZ is 8.6%, and for the classic Kasting et al. (1993) HZ it is 5.8%
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Re: Kepler News and Results (Thread 2)

Post by pochimax on 11th November 2013, 12:29 pm

Lazarus wrote:and for the classic Kasting et al. (1993) HZ it is 5.8%
But this is for planets size 1-2 earth radius. ¿what about earth sizes plus or minus 25%?

Maybe true earth analogs have a 1% occurrence, in the Kasting et. al HZ and earth size.
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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 11th November 2013, 2:31 pm

Of course you can make the figure as low as you want by restricting the range more and more, depending on how pessimistically you want to spin the statistics.

+/-25% in radius seems to me too conservative... IIRC from the Kepler results the mini-Neptune/rocky transition is around 1.5 Earth radii, and 0.5 Earth radii gets you roughly to Mars, which at least has some evidence of being able to support oceans.
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Re: Kepler News and Results (Thread 2)

Post by tommi59 on 19th November 2013, 4:12 am

Independent confirmation of kepler 88c(koi142)by radial velocity.Mass of a planet is higher than determined by ttv again, this time about 20%
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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 19th November 2013, 4:59 am

tommi59 wrote:Independent confirmation of kepler 88c(koi142)by radial velocity.Mass of a planet is higher than determined by ttv again, this time about 20%
Link.
http://arxiv.org/abs/1311.4335

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Re: Kepler News and Results (Thread 2)

Post by Led_Zep on 19th November 2013, 9:52 am

Exclamation 
It's not a little thing :
"...Therefore, this is the first radial velocities confirmation of non-transiting planet discovered with transit timing variations, providing an independent validation of the TTVs technique..."
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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 8th December 2013, 9:24 am

Here's an interesting website that has several KOIs and a transit timing analysis and short discussion for each system. Some of their results are particularly interesting.
http://exoplanet-science.com/Home.html

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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 18th December 2013, 9:46 pm

Robotic Laser-Adaptive-Optics Imaging of 715 Kepler Exoplanet Candidates using Robo-AO
http://arxiv.org/abs/1312.4958

The Robo-AO Kepler Planetary Candidate Survey is designed to observe every Kepler planet candidate host star with laser adaptive optics imaging to search for blended nearby stars, which may be physically associated companions and/or responsible for transit false positives. In this paper we present the results from the 2012 observing season, searching for stars close to 715 representative Kepler planet candidate hosts. We find 53 companions, 44 of which are new discoveries. We detail the Robo-AO survey data reduction methods including a method of using the large ensemble of target observations as mutual point-spread-function references, along with a new automated companion-detection algorithm designed for large adaptive optics surveys. Our survey is sensitive to objects from 0.15" to 2.5" separation, with contrast ratios up to delta-m~6. We measure an overall nearby-star-probability for Kepler planet candidates of 7.4% +/- 1.0%, and calculate the effects of each detected nearby star on the Kepler-measured planetary radius. We discuss several KOIs of particular interest, including KOI-191 and KOI-1151, which are both multi-planet systems with detected stellar companions whose unusual planetary system architecture might be best explained if they are ''coincident multiple'' systems, with several transiting planets shared between the two stars. Finally, we detect 2.6-sigma evidence for <15d-period giant planets being 2-3 times more likely be found in wide stellar binaries than smaller close-in planets and all sizes of further-out planets.

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Re: Kepler News and Results (Thread 2)

Post by Shellface on 19th December 2013, 12:20 pm

Finally, we detect 2.6-sigma evidence for <15d-period giant planets being 2-3 times more likely be found in wide stellar binaries than smaller close-in planets and all sizes of further-out planets.
Well, that's interesting. If the result of Kozai oscillations, then this can be interpreted as Hot Jupiters forming at several AU (as expected) and smaller planets forming closer in (as suggested) and probably migrating independently. Under the assumption that giant planet formation rates are identical for multiples and non-multiples, this also implies that there should be less wide-separation giants in multiple star systems, which would be interesting to test.

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Re: Kepler News and Results (Thread 2)

Post by Led_Zep on 19th December 2013, 5:07 pm

Sirius_Alpha wrote:
tommi59 wrote:Independent confirmation of kepler 88c(koi142)by radial velocity.Mass of a planet is higher than determined by ttv again, this time about 20%
Link.
http://arxiv.org/abs/1311.4335

http://www.spacedaily.com/reports/First_detection_of_a_predicted_unseen_exoplanet_999.html
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Re: Kepler News and Results (Thread 2)

Post by Mongo on 19th December 2013, 9:54 pm

Planetary Candidates Observed by Kepler IV: Planet Sample From Q1-Q8 (22 Months)

We provide updates to the Kepler planet candidate sample based upon nearly two years of high-precision photometry (i.e., Q1-Q8). From an initial list of nearly 13,400 Threshold Crossing Events (TCEs), 480 new host stars are identified from their flux time series as consistent with hosting transiting planets. Potential transit signals are subjected to further analysis using the pixel-level data, which allows background eclipsing binaries to be identified through small image position shifts during transit. We also re-evaluate Kepler Objects of Interest (KOI) 1-1609, which were identified early in the mission, using substantially more data to test for background false positives and to find additional multiple systems. Combining the new and previous KOI samples, we provide updated parameters for 2,738 Kepler planet candidates distributed across 2,017 host stars. From the combined Kepler planet candidates, 472 are new from the Q1-Q8 data examined in this study. The new Kepler planet candidates represent ~40% of the sample with Rp~1 Rearth and represent ~40% of the low equilibrium temperature (Teq<300 K) sample. We review the known biases in the current sample of Kepler planet candidates relevant to evaluating planet population statistics with the current Kepler planet candidate sample.

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Re: Kepler News and Results (Thread 2)

Post by Edasich on 20th December 2013, 3:59 am

New Kepler designations for KOIs in NASA Exoplanet Archive:

•More than 1,089 new KOIs from the Q1-16 release are now available in the KOI interactive table. More information is in the documentation. Also, BJD has been added to the KOI and TCE tables.

•We've added 34 new planets—32 of them from Kepler! ◦They are, in no particular order: HD 106906 b, OGLE-2012-BLG-0406L b, KOI-156.01 (Kepler-114 c), KOI-156.03 (Kepler-114 d), KOI-274.01 (Kepler-128 b), KOI-274.02 (Kepler-128 c), KOI-285.01 (Kepler-92 b), KOI-285.02 (Kepler-92 c), KOI-370.02 (Kepler-145 b), KOI-370.01 (Kepler-145 c), KOI-523.02 (Kepler-177 b), KOI-523.01 (Kepler-177 c), KOI-834.01 (Kepler-238 e), KOI-834.05 (Kepler-238 f), KOI-1203.01 (Kepler-276 c), KOI-1203.03 (Kepler-276 d), KOI-1215.01 (Kepler-277 b), KOI-1215.02 (Kepler-277 c), KOI-1236.01 (Kepler-279 c), KOI-1236.03 (Kepler-279 d), KOI-1278.01 (Kepler-282 d), KOI-1278.02 (Kepler-282 e), KOI-1563.01 (Kepler-305 b), KOI-1563.02 (Kepler-305 c), KOI-1576.01 (Kepler-307 b), KOI-1576.02 (Kepler-307 c), KOI-1873.02 (Kepler-328 b), KOI-1873.01 (Kepler-328 c), KOI-2025.01 (Kepler-350 c), KOI-2025.02 (Kepler-350 d), KOI-2672.02 (Kepler-396 b), KOI-2672.01 (Kepler-396 c), Kepler-91 b (KOI-2133.01) and Kepler-410 A b (KOI-42.01).

◦Please note that Kepler numbers are assigned on request and added to the archive when the publication is available to the community. Some Kepler numbers may appear non-sequential until all papers are released.
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Re: Kepler News and Results (Thread 2)

Post by tommi59 on 20th December 2013, 4:19 am

Any link edasich?
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Re: Kepler News and Results (Thread 2)

Post by Stalker on 20th December 2013, 8:16 am

O_o Il will work hard this week-end to update my databse!

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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 20th December 2013, 1:34 pm

tommi59: The NASA Exoplanet Archive is at http://exoplanetarchive.ipac.caltech.edu/
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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 20th December 2013, 8:08 pm

Well so much for naming planets in order of their confirmation.
O_o Il will work hard this week-end to update my databse!
Took me just ten minutes. All I had to do was change names. Almost all of those planets were on arXiv already.

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Re: Kepler News and Results (Thread 2)

Post by Stalker on 21st December 2013, 2:25 am

None of this KOI are in my confirmed list.

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Re: Kepler News and Results (Thread 2)

Post by Edasich on 21st December 2013, 4:36 am

Stalker wrote:None of this KOI are in my confirmed list.

I bet now they are Wink
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Re: Kepler News and Results (Thread 2)

Post by tommi59 on 21st December 2013, 10:45 am

They are not in kepler confirmed planets?
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Re: Kepler News and Results (Thread 2)

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