Kepler News and Results (Thread 2)

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Re: Kepler News and Results (Thread 2)

Post by Led_Zep on 4th June 2013, 11:47 am

Iím not agree !! I talk about planetary candidates

http://arxiv.org/abs/1006.2799

Look at page 21 : appendix. List of planetary candidates
KOIs are all planetary candidates !!
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Re: Kepler News and Results (Thread 2)

Post by pochimax on 4th June 2013, 12:40 pm

Led_Zep wrote:Iím not agree !! I talk about planetary candidates
Look at page 21 : appendix. List of planetary candidates
KOIs are all planetary candidates !!
Please, read carefully and realize that they talk about 706 candidates but the list at page 21 includes KOI numbers up to 896.... so there were some KOIs that weren' t planet candidates (in fact they were false positives).

I don' t find any change. Only they have changed the reporting phylosophy.
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Re: Kepler News and Results (Thread 2)

Post by Led_Zep on 4th June 2013, 2:04 pm

Yes I know (I use to not distinguish "KOIs" and "planetary candidates, it's my fault)
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Re: Kepler News and Results (Thread 2)

Post by Led_Zep on 4th June 2013, 2:26 pm

http://www.astronomy.com/en/News-Observing/News/2013/06/Kepler%20stars%20and%20planets%20are%20bigger%20than%20previously%20thought.aspx

Kepler stars and planets are bigger than previously thought
The results of a new study reduce the number of candidate Earth-sized exoplanets detected by the plant-hunting mission
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Re: Kepler News and Results (Thread 2)

Post by pochimax on 8th June 2013, 4:00 am

503 new planet candidates from the recent 1.924 KOI' s

http://www.nasa.gov/mission_pages/kepler/news/keplerm-20130607.html

And that planets that migrate to inner orbits don' t end inside of its star thanks to tidal circularization of orbits

http://www.nasa.gov/mission_pages/kepler/news/kepler20130606.html

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Re: Kepler News and Results (Thread 2)

Post by Led_Zep on 8th June 2013, 4:40 am

Now it's clear : Wink

"... These newly announced planet candidates bring the current count of Kepler planet candidates to 3,216..."
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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 11th June 2013, 9:58 am

The Hunt for Exomoons with Kepler (HEK): III. The First Search for an Exomoon around a Habitable-Zone Planet
http://arxiv.org/abs/1306.1530

Moons above 0.54 Earth masses are excluded around Kepler-22b to 95% confidence. Also presents somewhat tighter constraints on the planetary mass.
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Re: Kepler News and Results (Thread 2)

Post by Led_Zep on 12th June 2013, 4:32 am

http://arxiv.org/abs/1306.2308

Kepler Microlens Planets and Parallaxes

Kepler's quest for other Earths need not end just yet: it remains capable of characterizing cool Earth-mass planets by microlensing, even given its degraded pointing control. If Kepler were pointed at the Galactic bulge, it could conduct a search for microlensing planets that would be virtually non-overlapping with ground-based surveys. More important, by combining Kepler observations with current ground-based surveys, one could measure the "microlens parallax" \pi_E for a large fraction of the known microlensing events. Such parallax measurements would yield mass and distance determinations for the great majority of microlensing planets, enabling much more precise study of the planet distributions as functions of planet and host mass, planet-host separation, and Galactic position (particularly bulge vs. disk). In addition, rare systems (such as planets orbiting brown dwarfs or black holes) that are presently lost in the noise would be clearly identified. In contrast to Kepler's current primary hunting ground of close-in planets, its microlensing planets would be in the cool outer parts of solar systems, generally beyond the snow line. The same survey would yield a spectacular catalog of brown-dwarf binaries, probe the stellar mass function in a unique way, and still have plenty of time available for asteroseismology targets.
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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 16th June 2013, 5:14 pm

Interesting idea, and I'd always wondered if Kepler would by chance see a microlensing event even if it were not aimed at the best field of view for such things.

Wonder what the Kepler team has to say about this idea. From the mission manager update pochimax posted earlier, it looks like they are still trying with the reaction wheels.
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Re: Kepler News and Results (Thread 2)

Post by Led_Zep on 4th July 2013, 4:38 pm

http://www.nasa.gov/content/kepler-mission-manager-update-preparing-for-recovery/

Kepler Mission Manager Update: Preparing for Recovery

- The team continues to disposition Kepler Objects of Interest (KOIs) found by searching the observational data from Quarters 1 to Quarter 12. With 63 more planet candidates added since the last report, the count now stands at 3,277.
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Re: Kepler News and Results (Thread 2)

Post by Led_Zep on 18th July 2013, 12:22 pm

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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 24th July 2013, 6:05 pm

Initial results of recovery.
http://www.nasa.gov/content/kepler-mission-manager-update-initial-recovery-tests/#.UfBOXY2yLjI

Looks like some motion in both wheels. They're working to see what steps to take now.

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Re: Kepler News and Results (Thread 2)

Post by tommi59 on 2nd August 2013, 2:13 am

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Re: Kepler News and Results (Thread 2)

Post by PlutonianEmpire on 2nd August 2013, 11:26 am

Left out the quote box to add to the suspense, huh? Razz

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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 5th August 2013, 9:06 pm

Four more two-planet systems from TTV analysis.
http://arxiv.org/abs/1308.0996

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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 6th August 2013, 9:50 pm

A Survey for Very Short-Period Planets in the Kepler Data
http://arxiv.org/abs/1308.1379

Looks like they found planet candidates in periods as short as 3.3 hr.

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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 12th August 2013, 8:20 pm

KeSeF - Kepler Self Follow-up Mission
http://arxiv.org/abs/1308.2252

Proposes a way to correct for the drift of stars on the CCD using short-cadence photometry.
We also outline the modifications needed to flight software in order allow for such observations to take place, aiming to provide ample non-photometric data that should allow post-processing to recover most of the pre-failure photometric performance. In total, the KeSeF Mission will allow Kepler to follow up it's own previous discoveries in a way that is not otherwise possible. By doing so it will enable to continue pursuing nearly all the science goals that made the original mission choose staring at a single field of view in the first place.

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Re: Kepler News and Results (Thread 2)

Post by Stalker on 13th August 2013, 2:45 am

Kesef=money in hebrew What a Face

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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 15th August 2013, 3:37 am

Teleconference today about the status of the Kepler spacecraft.
http://www.nasa.gov/content/nasa-hosts-kepler-spacecraft-status-teleconference/

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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 15th August 2013, 2:04 pm

"We do not believe we can recover three-wheel operations for original mission." Now studying two-wheel ops. Science and engineering study due in fall to assess usability and science output for Kepler. Will evaluate whether it's worth the funds to keep it going.

Now moving onto data analysis phase.

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Re: Kepler News and Results (Thread 2)

Post by Stalker on 20th August 2013, 4:11 am

Frequency of Close Companions among Kepler Planets - a TTV study
A transiting planet exhibits sinusoidal transit-time-variations (TTV) if perturbed by a companion near a mean-motion-resonance (MMR). Among the low-mass Kepler planets, the fraction of transiting planets that show TTV can be taken as a proxy for the intrinsic frequency of companions orbiting close to and inward of the 2:1 MMR.
We search for sinusoidal TTVs in more than 2600 Kepler candidates, using the publicly available Kepler light-curves (Q0-Q12). We find that the TTV fractions rise strikingly with the transit multiplicity. Systems where four or more planets transit enjoy four times higher TTV fraction than those where a single planet transits, and about twice higher than those for doubles and triples. In contrast, models in which all transiting planets arise from similar dynamical configurations predict comparable TTV fractions among these different systems. Our results therefore suggest that there are at least two different classes of Kepler systems, one closely packed and one more sparsely populated.

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Re: Kepler News and Results (Thread 2)

Post by Stalker on 21st August 2013, 1:27 am

Stalker wrote:Frequency of Close Companions among Kepler Planets - a TTV study
A transiting planet exhibits sinusoidal transit-time-variations (TTV) if perturbed by a companion near a mean-motion-resonance (MMR). Among the low-mass Kepler planets, the fraction of transiting planets that show TTV can be taken as a proxy for the intrinsic frequency of companions orbiting close to and inward of the 2:1 MMR.
We search for sinusoidal TTVs in more than 2600 Kepler candidates, using the publicly available Kepler light-curves (Q0-Q12). We find that the TTV fractions rise strikingly with the transit multiplicity. Systems where four or more planets transit enjoy four times higher TTV fraction than those where a single planet transits, and about twice higher than those for doubles and triples. In contrast, models in which all transiting planets arise from similar dynamical configurations predict comparable TTV fractions among these different systems. Our results therefore suggest that there are at least two different classes of Kepler systems, one closely packed and one more sparsely populated.
Here is the plots for Xie et al. 2013 TTV candidates. Can we consider this 67 figures as confirmation of 67 new validated/confirmed KOIs?

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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 21st August 2013, 7:28 am

That seems reasonable. Not sure though.

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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 21st August 2013, 10:18 am

http://arxiv.org/abs/1208.3312
KOI-148 = Kepler-48.
KOI-152 = Kepler-79.
KOI-248 = Kepler-49.
KOI-500 = Kepler-80.
KOI-829 = Kepler-53.
KOI-877 = Kepler-81.
KOI-880 = Kepler-82.
KOI-898 = Kepler-83.
KOI-1270 = Kepler-57.
KOI-1336 = Kepler-58.
KOI-1589 = Kepler-84.
KOI-2038 = Kepler-85.

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Re: Kepler News and Results (Thread 2)

Post by Stalker on 21st August 2013, 11:03 am

Finally...

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Re: Kepler News and Results (Thread 2)

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