Kepler News and Results (Thread 2)

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Re: Kepler News and Results (Thread 2)

Post by Edasich on 21st August 2013, 1:43 pm

Now Kepler is rivalling SuperWASP with confirmed planetary systems count.
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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 21st August 2013, 2:26 pm

Comments: Accepted to ApJS. 17 pages, 11 figures, 3 tables. KOI 869 is replaced with KOI 2038. Kepler numbers are assigned
So what happened to KOI-869?
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Re: Kepler News and Results (Thread 2)

Post by Edasich on 21st August 2013, 5:23 pm

Lazarus wrote:
Comments: Accepted to ApJS. 17 pages, 11 figures, 3 tables. KOI 869 is replaced with KOI 2038. Kepler numbers are assigned
So what happened to KOI-869?
Independent confirmation and synonymy, I guess.
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Re: Kepler News and Results (Thread 2)

Post by Led_Zep on 31st August 2013, 12:30 pm

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Re: Kepler News and Results (Thread 2)

Post by Led_Zep on 3rd September 2013, 3:32 am

http://arxiv.org/abs/1309.0009

Habitable Planets Around White Dwarfs: an Alternate Mission for the Kepler Spacecraft

A large fraction of white dwarfs (WDs) may host planets in their habitable zones. These planets may provide our best chance to detect bio-markers on a transiting exoplanet, thanks to the diminished contrast ratio between the Earth-sized WD and its Earth-sized planets. The JWST is capable of obtaining the first spectroscopic measurements of such planets, yet there are no known planets around WDs. Here we propose to take advantage of the unique capability of the Kepler spacecraft in the 2-Wheels mode to perform a transit survey that is capable of identifying the first planets in the habitable zone of a WD. We propose to obtain Kepler time-series photometry of 10,000 WDs in the SDSS imaging area to search for planets in the habitable zone. Thanks to the large field of view of Kepler, for the first time in history, a large number of WDs can be observed at the same time, which is essential for discovering transits. Our proposed survey requires a total of 200 days of observing time, and will find up to 100 planets in the WD habitable zone. This survey will maintain Kepler's spirit of searching for habitable Earths, but near new hosts. With few-day observations and minute-cadences per field, it will also open up a completely unexplored discovery space. In addition to planets, this survey is sensitive to pulsating WDs, as well as eclipsing short period stellar and substellar companions. These have important implications for constraining the double WD merger rate and their contribution to Type Ia supernovae and the gravitational wave foreground. Given the relatively low number density of our targets, this program can be combined with other projects that would benefit from high cadence and many-fields observations with Kepler, e.g. a transit survey of a magnitude-limited, complete sample of nearby M dwarfs or asteroseismology of variable stars (e.g. RR Lyrae) in the same fields
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Re: Kepler News and Results (Thread 2)

Post by Edasich on 3rd September 2013, 9:39 am

So far only a large-separation, imaged exoplanet has been detected around a white dwarfs (WD 0806-661 b) plus a controversial timing-detected Jovian planet at GD66 (... and I expect it to be confirmed sooner or later rather retracted). Most of stellar remnants have revealed "tricky" in exoplanet search, except few notable cases.

Good luck... Rolling Eyes
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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 3rd September 2013, 1:47 pm

Why would you expect GD 66b to be confirmed? Last I heard, the different pulsation modes vary in antiphase, which is bad news for the planetary hypothesis.

Are the KOI-55 planets expected to survive the helium-burning lifetime of the sdB star? (The intense heating is rather discouraging for the planets retaining much in the way of volatiles by the time the star becomes a white dwarf.)
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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 4th September 2013, 8:21 pm

KOI-127 == Kepler-77.
http://arxiv.org/abs/1305.3891

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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 5th September 2013, 2:54 am

Another brown dwarf in the KOI list:

SOPHIE velocimetry of Kepler transit candidates IX. KOI-415 b: a long-period, eccentric transiting brown dwarf to an evolved Sun
http://arxiv.org/abs/1309.0905
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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 10th September 2013, 8:24 pm

Transit Timing Variation of Near-Resonance Planetary Pairs. II. Confirmation of 30 planets in 15 Multiple Planet Systems
http://arxiv.org/abs/1309.2329

A Discovery of a Candidate Companion to a Transiting System KOI-94: A Direct Imaging Study for a Possibility of a False Positive
http://arxiv.org/abs/1309.2559

Looks like the evidence suggests all four planet candidates are real.

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Re: Kepler News and Results (Thread 2)

Post by Edasich on 15th September 2013, 3:43 am

Sirius_Alpha wrote:Transit Timing Variation of Near-Resonance Planetary Pairs. II. Confirmation of 30 planets in 15 Multiple Planet Systems
http://arxiv.org/abs/1309.2329

A Discovery of a Candidate Companion to a Transiting System KOI-94: A Direct Imaging Study for a Possibility of a False Positive
http://arxiv.org/abs/1309.2559

Looks like the evidence suggests all four planet candidates are real.
 
30 (+2) Kepler planets have been added to EPE. The most massive planet update in aeons... Laughing
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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 15th September 2013, 3:45 pm

The Kepler website has had a rather major overhaul. Seems also that the discoveries table has disappeared?
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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 29th September 2013, 8:16 pm

Influence of Stellar Multiplicity On Planet Formation. I. An Insight From $Kepler$ Multiple Planet Candidate Systems
http://arxiv.org/abs/1309.7097

The planet occurrence rate for multiple stars is important in two aspects. First, almost half of stellar systems in the solar neighborhood are multiple systems. Second, the comparison of the planet occurrence rate for multiple stars to that for single stars sheds light on the influence of stellar multiplicity on planet formation and evolution. We develop a method of distinguishing planet occurrence rate for single and multiple stars. From a sample of 138 bright (K$_P$$<$13.5) $Kepler$ multi-planet candidate systems, we compare the stellar multiplicity rate of these planet host stars to that of field stars. Using dynamical stability analyses and archival Doppler measurements, we find that the stellar multiplicity rate of planet host stars is significantly lower than field stars for semi-major axes less than 10 AU, suggesting that planet formation and evolution are suppressed by the presence of a close-in companion star at these separations. The influence of stellar multiplicity at larger separations is uncertain because of search incompleteness due to a limited Doppler observation time baseline and a lack of high resolution imaging observation. We validate the planet nature for KOI 82.01, KOI 115.01, KOI 282.01 and KOI 1781.02. This sample of bright $Kepler$ multi-planet candidates with refined stellar and orbital parameters, planet confidence estimation, and nearby stellar companion identification offers a well-characterized sample for future theoretical and observational study.

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Re: Kepler News and Results (Thread 2)

Post by tommi59 on 30th September 2013, 4:29 am

Some correction of radii of stars. Kepler 36 for example have slightly different size especially c 8.26 earth radii??b even smaller?1.36?
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Re: Kepler News and Results (Thread 2)

Post by Edasich on 30th September 2013, 9:02 am

Added to EPE:
 
http://exoplanet.eu/catalog/koi-82_b/
http://exoplanet.eu/catalog/koi-115_b/
http://exoplanet.eu/catalog/koi-282_b/
http://exoplanet.eu/catalog/koi-1781_b/
 
However there are two planets too much in the catalog, accounting Kap And b to be removed (as being no more a planet but a brown dwarf) and PH1 to be merged with KIC 4862625 b (and renamed as Kepler-64 too).
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Re: Kepler News and Results (Thread 2)

Post by Edasich on 1st October 2013, 3:57 am

New entry at Kepler website (reloaded): http://kepler.nasa.gov/Mission/discoveries/

Kepler-86 (KOI-3663) b, which matches with PH-2 b...
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Re: Kepler News and Results (Thread 2)

Post by Stalker on 1st October 2013, 4:31 am

And Kepler-77 alias KOI-127, still missing in the Kepler website:
http://www.aanda.org/articles/aa/abs/2013/09/aa21901-13/aa21901-13.html
There is still Kepler-72 and 73 to find.

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Re: Kepler News and Results (Thread 2)

Post by Edasich on 1st October 2013, 12:26 pm

Is it just a glitch of my browser or so do you have a message like "Due to the lapse in federal government funding, this website is not available" when you access to Kepler website?
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Re: Kepler News and Results (Thread 2)

Post by PlutonianEmpire on 1st October 2013, 1:21 pm

It is, sadly, not a glitch. The US government actually shut down overnight, because of partisan politics.

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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 1st October 2013, 1:51 pm



Last edited by Lazarus on 1st October 2013, 5:20 pm; edited 1 time in total
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Re: Kepler News and Results (Thread 2)

Post by Edasich on 1st October 2013, 2:42 pm

So the updates of mine and Stalker's are... the freshest. Laughing
 
Surfing around the net I reckon it'll be a matter of 4 weeks or so. Everything shall solve somehow.

But don't touch arXiv!! Evil or Very Mad 
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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 2nd October 2013, 1:56 pm

So far, Kepler Science Conference II is still planned to go ahead.

Hopefully it will, there seem to be some pretty interesting discoveries in the pipeline...
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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 5th October 2013, 6:31 am

More with regards to politics and the Kepler Science Conference II

The Guardian: US scientists boycott Nasa conference over China ban

Federal laws have been put in place that make it illegal for NASA to host Chinese citizens. As KSC2 is on NASA property, this means that they are excluded by law from attending the conference.

The law is part of a broad and aggressive move initiated by congressman Frank Wolf, chair of the House appropriations committee, which has jurisdiction over Nasa. It aims to restrict the foreign nationals' access to Nasa facilities, ostensibly to counter espionage.
The scientists are not happy (to say the least) about this and there seem to be quite a few people pulling out of the conference, including several of the big names in exoplanet research:

Geoff Marcy, an astronomy professor at the University of California, Berkeley, who has been tipped to win a Nobel prize for his pioneering work on exoplanets, or planets outside the solar system, called the ban "completely shameful and unethical".

In an email sent to the conference organisers, Marcy said: "In good conscience, I cannot attend a meeting that discriminates in this way. The meeting is about planets located trillions of miles away, with no national security implications," he wrote.

"It is completely unethical for the United States of America to exclude certain countries from pure science research," Marcy told the Guardian. "It's an ethical breach that is unacceptable. You have to draw the line."
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Re: Kepler News and Results (Thread 2)

Post by PlutonianEmpire on 5th October 2013, 2:03 pm

Boycotts don't work. Never have.

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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 9th October 2013, 2:50 pm

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Re: Kepler News and Results (Thread 2)

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