Kepler News and Results (Thread 2)

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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 10th October 2013, 9:10 pm

KOI-152's planets are extremely low in density. KOI-152 d specifically looks like a lower-density analogue of Kepler-87c.
http://arxiv.org/abs/1310.2642

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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 11th October 2013, 2:19 am

NASAWatch: Confusion Over NASA's Policies That Ban Certain People

What a mess.
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Re: Kepler News and Results (Thread 2)

Post by Edasich on 11th October 2013, 4:43 am

Sirius_Alpha wrote:KOI-152's planets are extremely low in density. KOI-152 d specifically looks like a lower-density analogue of Kepler-87c.
http://arxiv.org/abs/1310.2642
http://talk.planethunters.org/discussions/DPH101z4nz

KOI-152 = Kepler-79.

They seem confirmed since aeons, but they aren't listed anywhere as such.
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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 11th October 2013, 5:46 pm

Low-density planets in tightly-packed systems seems to be a recurring theme.

Where are the terrestrials hiding? Detection biases or are they actually relatively rare?
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Re: Kepler News and Results (Thread 2)

Post by tommi59 on 12th October 2013, 4:24 am

Well, all of the low density planets discovered or confirmed recently have radii well over 3 earths look at kepler 20 c is dense considering its radius 3.1 earth.Hd 97658 b is smaller but significantly heavier than those planets.I would not be surprise if planets with radii less than 2 earth have similar massess like koi 152 planets.
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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 13th October 2013, 10:33 am

NASAWatch: Now The Shutdown Is to Blame for Kepler Meeting Problems

We have just learned that the efforts of NASA's Ames Research Center to ensure that our Chinese astronomer colleagues will be able to attend the Second Kepler Science Conference have been halted by the fact these approvals must be entered into a computer system at NASA HQ in Washington DC. Because of the ongoing federal government shutdown, there is no one at NASA HQ who can complete the approval process. Of course, if the federal shutdown continues much longer, the conference will not be able to begin as scheduled on November 3, 2013. We fear that the meeting may have to be cancelled as a result, or delayed. The ability of scientists to attend an open scientific meeting about the spectacular results produced by NASA's Kepler Space Telescope is another likely fatality of the failure of the U.S. Congress to enact a federal budget for FY2014. Alan Boss, SOC Co-Chair, KSC II
Isn't politics wonderful?
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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 14th October 2013, 6:01 am

Kepler Finds First Signs of Other Earths

Looks like a few Earth analogues are starting to come out of the data.

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Re: Kepler News and Results (Thread 2)

Post by Stalker on 16th October 2013, 5:35 am

[url="http://carnegiescience.edu/news/found_planets_skimming_star%E2%80%99s_surface"]Planets Skimming a Star’s Surface[/url]

On litterature: http://arxiv.org/pdf/1308.1379v1.pdf


Last edited by Stalker on 16th October 2013, 1:48 pm; edited 1 time in total

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Re: Kepler News and Results (Thread 2)

Post by Edasich on 16th October 2013, 6:45 am

Edited URL
 
 
Found: Planets Skimming a Star’s Surface

But "found" what? I don't think they've been confirmed. Or are they? Question 
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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 16th October 2013, 7:05 am

No. Fourth paragraph:
If confirmed...

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Re: Kepler News and Results (Thread 2)

Post by Edasich on 16th October 2013, 10:57 am

Sirius_Alpha wrote:No. Fourth paragraph:
If confirmed...
As I thought. I don't get the reason for such press releases. Rolling Eyes
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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 16th October 2013, 11:02 am

Since the false positive probability is low, and the fact that we already have an example of such a planet, it may be reasonable to state that they have been found.

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Re: Kepler News and Results (Thread 2)

Post by PlutonianEmpire on 17th October 2013, 12:49 am

Late at night here, but the media outlets reported the shutdown finally ended tonight.

So hopefully R&D can resume soon. Smile

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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 17th October 2013, 2:42 pm

KOI-142 = Kepler-88.
Reference:
http://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=KOI+142+b&type=CONFIRMED_PLANET

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Re: Kepler News and Results (Thread 2)

Post by tommi59 on 17th October 2013, 4:31 pm

http://www.sciencedaily.com/releases/2013/10/131017144410.htm
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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 22nd October 2013, 9:31 pm

A seventh planet candidate at KOI-351.

Planet Hunters VI: The First Kepler Seven Planet Candidate System and 13 Other Planet Candidates from the Kepler Archival Data
http://arxiv.org/abs/1310.5912
We report the discovery of 14 new transiting planet candidates in the Kepler field from the Planet Hunters citizen science program. None of these candidates overlap with Kepler Objects of Interest (KOIs), and five of the candidates were missed by the Kepler Transit Planet Search (TPS) algorithm. The new candidates have periods ranging from 124-904 days, eight residing in their host star's habitable zone (HZ) and two (now) in multiple planet systems. We report the discovery of one more addition to the six planet candidate system around KOI-351, marking the first seven planet candidate system from Kepler

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Re: Kepler News and Results (Thread 2)

Post by tommi59 on 23rd October 2013, 4:12 am

Nice.I knew they will find 7 transiting planets, maybe is more(non transiting) between 9 days and 59 or beyond currently farthest in this system
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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 23rd October 2013, 1:27 pm

A planet candidate only slightly larger than Earth in a 757-day orbit... around an A-type star! Even if it is too hot to be habitable, that's impressive if it can be confirmed.
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Re: Kepler News and Results (Thread 2)

Post by Kodas on 24th October 2013, 3:48 pm

tommi59 wrote:Nice.I knew they will find 7 transiting planets, maybe is more(non transiting) between 9 days and 59  or beyond currently farthest  in this system
Indeed rumours are there may be and ttvs are being scrutinised, but can't say more for now.

Lazarus wrote:A planet candidate only slightly larger than Earth in a 757-day orbit... around an A-type star! Even if it is too hot to be habitable, that's impressive if it can be confirmed.
Yeah that's one of the ones I found Very Happy , very sneaky indeed as it was hidden in poorly-calibrated data. Clear in the raw data though.

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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 30th October 2013, 8:19 pm

Densities and Eccentricities of 163 Kepler Planets from Transit Time Variations
http://arxiv.org/abs/1310.7942

We extract densities and eccentricities of 163 sub-Jovian planets by analyzing transit time variations (TTVs) obtained by the {\it Kepler} mission through Quarter 12. We partially circumvent the degeneracies that plague TTV inversion with the help of an analytical formula for the TTV. From the observed TTV phases, we find that most of these planets have eccentricities of order a few percent. More precisely, the r.m.s. eccentricity is 0.018+0.004−0.008, and planets smaller than 3R⊕ are around three times as eccentric as those bigger than 3R⊕. We also find a best-fit density-radius relationship ρ≈2.2 g/cm3×(R/3R⊕)−1.8 for the 64 planets that likely have small eccentricity and hence small statistical correction to their masses. Planets larger than 3R⊕ are mostly less dense than water, implying that their radii are largely set by a massive hydrogen atmosphere.
Looks like there's several planets in the 20 - 50 Earth-mass range that have densities greater than pure iron. Chthonian planets?

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Re: Kepler News and Results (Thread 2)

Post by Shellface on 30th October 2013, 10:27 pm

Does this paper have… any detection criteria? Because there are a lot of 1σ (as in, the error is the same as the value) TTV values listed… which dutifully provide meaningless values for masses. I think that explains those rather outlandish densities.

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Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 31st October 2013, 4:10 pm

NASA Hosts Media Briefing To Discuss Kepler Results
http://www.nasa.gov/press/2013/october/nasa-hosts-media-briefing-to-discuss-kepler-results/#.UnK5AflwqSo

NASA will video stream a news briefing at 10:15 a.m. PST (1:15 p.m. EST) Monday, Nov. 4, to announce new results from the agency's Kepler mission. The briefing, taking place during the Kepler Science Conference, will be in building 152 at NASA Research Park in Moffett Field, Calif.

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Re: Kepler News and Results (Thread 2)

Post by Lazarus on 31st October 2013, 4:17 pm

Shellface wrote:Does this paper have… any detection criteria? Because there are a lot of 1σ (as in, the error is the same as the value) TTV values listed… which dutifully provide meaningless values for masses. I think that explains those rather outlandish densities.
Bonus points for omitting the error values from the machine-readable table.

And converting between the given nominal masses and true masses depends on the eccentricity:
If planets in a pair have very low eccentricities (e ≪ |∆|), the nominal masses are the true masses, whereas if the eccentricities are much higher than that (e ≫ |∆|), the nominal masses are overestimates of the true masses. For intermediate eccentricities (e ~ |∆|), the nominal and true masses differ by an order unity factor—they can be either smaller or larger depending on the phase of Zfree. Note that, as shown in Section 3.1, many systems have intermediate eccentricities.
At least the planets in the high-density region of figure 3 are represented by the diamond symbols that indicate the nominal densities are overestimates of the true density.
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Re: Kepler News and Results (Thread 2)

Post by Edasich on 2nd November 2013, 4:44 am

New Kepler designation for confirmed Kepler Objects of Interests (KOIs): Kepler-89 for KOI-94 and Kepler-90 for KOI-351 systems.
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Re: Kepler News and Results (Thread 2)

Post by Stalker on 3rd November 2013, 12:08 pm

Sirius_Alpha wrote:Densities and Eccentricities of 163 Kepler Planets from Transit Time Variations
http://arxiv.org/abs/1310.7942

We extract densities and eccentricities of 163 sub-Jovian planets by analyzing transit time variations (TTVs) obtained by the {\it Kepler} mission through Quarter 12. We partially circumvent the degeneracies that plague TTV inversion with the help of an analytical formula for the TTV. From the observed TTV phases, we find that most of these planets have eccentricities of order a few percent. More precisely, the r.m.s. eccentricity is 0.018+0.004−0.008, and planets smaller than 3R⊕ are around three times as eccentric as those bigger than 3R⊕. We also find a best-fit density-radius relationship ρ≈2.2 g/cm3×(R/3R⊕)−1.8 for the 64 planets that likely have small eccentricity and hence small statistical correction to their masses. Planets larger than 3R⊕ are mostly less dense than water, implying that their radii are largely set by a massive hydrogen atmosphere.
Looks like there's several planets in the 20 - 50 Earth-mass range that have densities greater than pure iron. Chthonian planets?
Several of this planets are now on EPE.

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Re: Kepler News and Results (Thread 2)

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