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 Kepler News and Results (Thread 2)

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PlutonianEmpire
matthew27
ciceron
ThinkerX
Mongo
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Daniel
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Led_Zep
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Lazarus
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Kepler News and Results (Thread 2) - Page 21 Empty
PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty6th March 2019, 2:50 am

I'd seen KOI-4 in the abstracts list for the Kepler & K2 Science Conference V

Paper now on arXiv:

Chontos et al. "The Curious Case of KOI 4: Confirming Kepler's First Exoplanet"
https://arxiv.org/abs/1903.01591
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Lazarus
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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty7th March 2019, 6:56 pm

Dalba & Tamburo "Spitzer Detection of the Transiting Jupiter-analog Exoplanet Kepler-167e"
https://arxiv.org/abs/1903.01478

Still no TTVs, which makes possible follow-up with the ever-delayed JWST a possibility.
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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty18th March 2019, 8:51 pm

Long-Period Giant Companions to Three Compact, Multiplanet Systems
https://arxiv.org/abs/1903.07186

Quote :
Understanding the relationship between long-period giant planets and multiple smaller short-period planets is critical for formulating a complete picture of planet formation. This work characterizes three such systems. We present Kepler-65, a system with an eccentric (e=0.28+/-0.07) giant planet companion discovered via radial velocities (RVs) exterior to a compact, multiply-transiting system of sub-Neptune planets. We also use precision RVs to improve mass and radius constraints on two other systems with similar architectures, Kepler-25 and Kepler-68. In Kepler-68 we propose a second exterior giant planet candidate. Finally, we consider the implications of these systems for planet formation models, particularly that the moderate eccentricity in Kepler-65's exterior giant planet did not disrupt its inner system.

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Lazarus
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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty12th April 2019, 3:27 pm

A catalogue of transiting planet candidates with orbital periods longer than 2 years detected by the Kepler mission.

Kawahare & Masuda "Transiting Planets near the Snow Line from Kepler. I. Catalog"
https://arxiv.org/abs/1904.04980

Hints that Neptune-sized planets are at least as common as Jupiter-sized ones at the orbital periods studied.
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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty13th April 2019, 6:57 pm

Quote :
Kawahare & Masuda "Transiting Planets near the Snow Line from Kepler. I. Catalog"
https://arxiv.org/abs/1904.04980
Worth noting that KIC 4772953 = HD 226237 (V=11.76), KIC 6804821 = HD 226454 (V=10.51), and KIC 8410697 = Kepler-1654.

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Led_Zep
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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty16th April 2019, 12:53 pm

Lazarus wrote:
Led_Zep wrote:
Have you a link for the third planet in K-47 system ?
They're all in the abstracts booklet tommi59 linked in this post

As far as I'm aware, no discovery paper has yet been released, although it has been cited as "forthcoming" or "in prep" a couple of times.

Never too late ! Very Happy

http://www.ifa.hawaii.edu/info/press-releases/Kepler47d/

A team of astronomers, including Nader Haghighipour from the Institute for Astronomy at the University of Hawaiʻi at Mānoa, have discovered a third planet in the circumbinary planetary system Kepler-47.
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Lazarus
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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty16th April 2019, 2:10 pm

Awesome! Hopefully the paper will be on the arXiv in the near future.
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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty16th April 2019, 8:47 pm

Lazarus wrote:
Hopefully the paper will be on the arXiv in the near future.
Here it is! https://arxiv.org/abs/1904.07255

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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty11th June 2019, 2:32 pm

More nails in the coffin for planets orbiting sdB stars, studying KIC 10001893 (Kepler-429) and KIC 5807616 (Kepler-70).

Blokesz et al. "Analysis of putative exoplanetary signatures found in light curves of two sdBV stars observed by Kepler"
https://arxiv.org/abs/1906.03321

The signals for Kepler-429b and c are regarded as non-detectable/spurious. The signal for Kepler-429d is either an artefact of the data or a beating frequency of stellar pulsations.

The signals for Kepler-70b and c exhibit frequency variations that are not expected for orbiting planets. They are classified as beating frequencies from stellar g-modes.
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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty10th July 2019, 11:23 pm

New transit observations of Kepler-29b, Kepler-36c, Kepler-177c and KOI-1783.01 to constrain their masses from TTVs. They confirm the planetary nature of KOI-1783.01. Kepler-177 c appears to be the most massive example of the "super-puff" population to date.

Diffuser-Assisted Infrared Transit Photometry for Four Dynamically Interacting \textit{Kepler} Systems
https://arxiv.org/abs/1907.04445

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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty15th July 2019, 9:05 pm

Kepler Object of Interest Network III. Kepler-82f: A new non-transiting 21M⨁ planet from photodynamical modelling
https://arxiv.org/abs/1907.06534

Quote :
Context. The Kepler Object of Interest Network (KOINet) is a multi-site network of telescopes around the globe organised for follow-up observations of transiting planet candidate Kepler objects of interest (KOIs) with large transit timing variations (TTVs). The main goal of KOINet is the completion of their TTV curves as the Kepler telescope stopped observing the original Kepler field in 2013.
Aims. We ensure a comprehensive characterisation of the investigated systems by analysing Kepler data combined with new ground-based transit data using a photodynamical model. This method is applied to the Kepler-82 system leading to its first dynamic analysis.
Methods. In order to provide a coherent description of all observations simultaneously, we combine the numerical integration of the gravitational dynamics of a system over the time span of observations with a transit light curve model. To explore the model parameter space, this photodynamical model is coupled with a Markov chain Monte Carlo algorithm.
Results. The Kepler-82b/c system shows sinusoidal TTVs due to their near 2:1 resonance dynamical interaction. An additional chopping effect in the TTVs of Kepler-82c hints to a further planet near the 3:2 or 3:1 resonance. We photodynamically analysed Kepler long- and short-cadence data and three new transit observations obtained by KOINet between 2014 and 2018. Our result reveals a non-transiting outer planet with a mass of mf=20.9±1.0M⨁ near the 3:2 resonance to the outermost known planet, Kepler-82c. Furthermore, we determined the densities of planets b and c to the significantly more precise values ρb=0.98+0.10−0.14g cm−3 and ρc=0.494+0.066−0.077g cm−3.

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Lazarus
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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty16th July 2019, 4:24 pm

Titius-Bode fails again!
Quote :
Bovaird et al. (2015) predicted two additional planets in the Kepler-82 system with periods of 11.8 ± 2.0 days and 120 ± 20 days based on the Titius-Bode relation. Neither the new planet proposed here near the 3:2 resonance to Kepler-82c, nor the less viable option with a planet near the 3:1 resonance, matches the position of one of the predicted planets. The predicted outer planet is in between the two possibilities within 3σ distance to each of them.
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Led_Zep
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Kepler News and Results (Thread 2) - Page 21 Empty
PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty22nd August 2019, 2:36 pm

New circumbinary planets !! (ExSS4)

Kepler News and Results (Thread 2) - Page 21 8d28341305863104
Kepler News and Results (Thread 2) - Page 21 2b58fe1305863204
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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty25th August 2019, 9:11 pm

An 11 Earth-Mass, Long-Period Sub-Neptune Orbiting a Sun-like Star
https://arxiv.org/abs/1908.08585

Quote :
Although several thousands of exoplanets have now been detected and characterized, observational biases have led to a paucity of long-period, low-mass exoplanets with measured masses and a corresponding lag in our understanding of such planets. In this paper we report the mass estimation and characterization of the long-period exoplanet Kepler-538b. This planet orbits a Sun-like star (V = 11.27) with M_* = 0.892 +/- (0.051, 0.035) M_sun and R_* = 0.8717 +/- (0.0064, 0.0061) R_sun. Kepler-538b is a 2.215 +/- (0.040, 0.034) R_earth sub-Neptune with a period of P = 81.73778 +/- 0.00013 d. It is the only known planet in the system. We collected radial velocity (RV) observations with HIRES on Keck I and HARPS-N on the TNG. We characterized stellar activity by a Gaussian process with a quasi-periodic kernel applied to our RV and cross correlation function full width at half maximum (FWHM) observations. By simultaneously modeling Kepler photometry, RV, and FWHM observations, we found a semi-amplitude of K = 1.68 +/- (0.39, 0.38) m s^-1 and a planet mass of M_p = 10.6 +/- (2.5, 2.4) M_earth. Kepler-538b is the smallest planet beyond P = 50 d with an RV mass measurement. The planet likely consists of a significant fraction of ices (dominated by water ice), in addition to rocks/metals, and a small amount of gas. Sophisticated modeling techniques such as those used in this paper, combined with future spectrographs with ultra high-precision and stability will be vital for yielding more mass measurements in this poorly understood exoplanet regime. This in turn will improve our understanding of the relationship between planet composition and insolation flux and how the rocky to gaseous transition depends on planetary equilibrium temperature.

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tommi59
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Kepler News and Results (Thread 2) - Page 21 Empty
PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty26th August 2019, 2:44 am

Interesting case as usually planets with radii larger than 1.6 earth and cooler than 700 degrees
have low density
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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty5th September 2019, 9:56 pm

Discovery of a third planet at Kepler-88, an eccentric long-period giant planet.

The Discovery of the Long-Period, Eccentric Planet Kepler-88 d and System Characterization with Radial Velocities and Photodynamical Analysis
https://arxiv.org/abs/1909.02427

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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty8th October 2019, 8:55 pm

Using HARPS-N to characterise the long-period planets in the PH-2 and Kepler-103 systems
https://arxiv.org/abs/1910.03518

Quote :
We present confirmation of the planetary nature of PH-2b, as well as the first mass estimates for the two planets in the Kepler-103 system. PH-2b and Kepler-103c are both long-period and transiting, a sparsely-populated category of exoplanet. We use {\it Kepler} light-curve data to estimate a radius, and then use HARPS-N radial velocities to determine the semi-amplitude of the stellar reflex motion and, hence, the planet mass. For PH-2b we recover a 3.5-σ mass estimate of Mp=109+30−32 M⊕ and a radius of Rp=9.49±0.16 R⊕. This means that PH-2b has a Saturn-like bulk density and is the only planet of this type with an orbital period P>200 days that orbits a single star. We find that Kepler-103b has a mass of Mp,b=11.7+4.31−4.72 M⊕ and Kepler-103c has a mass of Mp,c=58.5+11.2−11.4 M⊕. These are 2.5σ and 5σ results, respectively. With radii of Rp,b=3.49+0.06−0.05 R⊕, and Rp,c=5.45+0.18−0.17 R⊕, these results suggest that Kepler-103b has a Neptune-like density, while Kepler-103c is one of the highest density planets with a period P>100 days. By providing high-precision estimates for the masses of the long-period, intermediate-mass planets PH-2b and Kepler-103c, we increase the sample of long-period planets with known masses and radii, which will improve our understanding of the mass-radius relation across the full range of exoplanet masses and radii.

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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty21st October 2019, 2:55 pm

Further characterization of the Kepler-59 system.

A super-Earth and a mini-Neptune around Kepler-59
https://arxiv.org/abs/1910.08522

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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty5th November 2019, 4:52 am

Led_Zep wrote:
New circumbinary planets !! (ExSS4)

Kepler News and Results (Thread 2) - Page 21 8d28341305863104
Kepler News and Results (Thread 2) - Page 21 2b58fe1305863204
Any extra info on these?

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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty24th December 2019, 11:19 am

Study of two planetary systems around red giant stars:

Jofré et al. "Gemini-GRACES high-quality spectra of Kepler evolved stars with transiting planets I. Detailed characterization of multi-planet systems Kepler-278 and Kepler-391"
https://arxiv.org/abs/1912.10278

The inferred eccentricities of the Kepler-278 planets are very high: the apastron of the inner planet lies beyond the periastron of the outer one. The ω values indicate the orbits are aligned but it would be interesting to know what a dynamical analysis would make of the proposed configuration!
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Lazarus
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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty24th December 2019, 2:17 pm

It does seem to hold up for 10kyr though... https://imgur.com/a/B9Fe87E
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Led_Zep
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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty3rd January 2020, 10:30 pm

PlutonianEmpire wrote:
Led_Zep wrote:
New circumbinary planets !! (ExSS4)

Kepler News and Results (Thread 2) - Page 21 8d28341305863104
Kepler News and Results (Thread 2) - Page 21 2b58fe1305863204
Any extra info on these?

Yes !

Abstract from AAS 235th :

Kepler News and Results (Thread 2) - Page 21 D8622e1329735950
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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty10th January 2020, 12:53 am

The system is now confirmed as Kepler-1661.

Kepler-1661 b: A Neptune-sized Kepler Transiting Circumbinary Planet around a Grazing Eclipsing Binary
https://arxiv.org/abs/2001.02840

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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty27th January 2020, 5:23 pm

More limits on planet occurrence in the globular cluster Messier 4:

Wallace et al. "A Search for Transiting Planets in the Globular Cluster M4 with K2: Candidates and Occurrence Limits"
https://arxiv.org/abs/2001.08362

PSR B1620-26 b remains a lonely planet... though given all the issues with detecting planets by timing binary systems, has anyone checked whether it's still there?
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PostSubject: Re: Kepler News and Results (Thread 2)   Kepler News and Results (Thread 2) - Page 21 Empty13th February 2020, 9:20 am

https://iopscience.iop.org/article/10.3847/1538-3881/ab5e5e
I am not sure if was published
Quite high density for this planet especially it has no high insolation and is far enough to avoid any photoevaporation
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