| Kepler News and Results (Thread 2) | |
|
+15PlutonianEmpire matthew27 ciceron ThinkerX Mongo Kodas Galzi Daniel jyril pochimax Led_Zep Shellface Sunchaser Stalker Lazarus 19 posters |
|
Author | Message |
---|
Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: Re: Kepler News and Results (Thread 2) 6th March 2019, 2:50 am | |
| | |
|
| |
Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: Re: Kepler News and Results (Thread 2) 7th March 2019, 6:56 pm | |
| Dalba & Tamburo "Spitzer Detection of the Transiting Jupiter-analog Exoplanet Kepler-167e" https://arxiv.org/abs/1903.01478Still no TTVs, which makes possible follow-up with the ever-delayed JWST a possibility. | |
|
| |
Sirius_Alpha Admin
Number of posts : 4319 Location : Earth Registration date : 2008-04-06
| Subject: Re: Kepler News and Results (Thread 2) 18th 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.
_________________ Caps Lock: Cruise control for 'Cool'!
| |
|
| |
Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: Re: Kepler News and Results (Thread 2) 12th 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/1904.04980Hints that Neptune-sized planets are at least as common as Jupiter-sized ones at the orbital periods studied. | |
|
| |
Sirius_Alpha Admin
Number of posts : 4319 Location : Earth Registration date : 2008-04-06
| Subject: Re: Kepler News and Results (Thread 2) 13th April 2019, 6:57 pm | |
| _________________ Caps Lock: Cruise control for 'Cool'!
| |
|
| |
Led_Zep SuperJovian
Number of posts : 721 Location : France Registration date : 2011-09-09
| Subject: Re: Kepler News and Results (Thread 2) 16th 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 ! 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. | |
|
| |
Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: Re: Kepler News and Results (Thread 2) 16th April 2019, 2:10 pm | |
| Awesome! Hopefully the paper will be on the arXiv in the near future. | |
|
| |
Sirius_Alpha Admin
Number of posts : 4319 Location : Earth Registration date : 2008-04-06
| Subject: Re: Kepler News and Results (Thread 2) 16th April 2019, 8:47 pm | |
| _________________ Caps Lock: Cruise control for 'Cool'!
| |
|
| |
Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: Re: Kepler News and Results (Thread 2) 11th 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/1906.03321The 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. | |
|
| |
Sirius_Alpha Admin
Number of posts : 4319 Location : Earth Registration date : 2008-04-06
| Subject: Re: Kepler News and Results (Thread 2) 10th 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 _________________ Caps Lock: Cruise control for 'Cool'!
| |
|
| |
Sirius_Alpha Admin
Number of posts : 4319 Location : Earth Registration date : 2008-04-06
| Subject: Re: Kepler News and Results (Thread 2) 15th 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. _________________ Caps Lock: Cruise control for 'Cool'!
| |
|
| |
Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: Re: Kepler News and Results (Thread 2) 16th 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.
| |
|
| |
Led_Zep SuperJovian
Number of posts : 721 Location : France Registration date : 2011-09-09
| |
| |
Sirius_Alpha Admin
Number of posts : 4319 Location : Earth Registration date : 2008-04-06
| Subject: Re: Kepler News and Results (Thread 2) 25th 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.
_________________ Caps Lock: Cruise control for 'Cool'!
| |
|
| |
tommi59 Jovian
Number of posts : 593 Age : 46 Location : Baile Atha Cliath Registration date : 2010-07-31
| Subject: Re: Kepler News and Results (Thread 2) 26th 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 | |
|
| |
Sirius_Alpha Admin
Number of posts : 4319 Location : Earth Registration date : 2008-04-06
| Subject: Re: Kepler News and Results (Thread 2) 5th 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 _________________ Caps Lock: Cruise control for 'Cool'!
| |
|
| |
Sirius_Alpha Admin
Number of posts : 4319 Location : Earth Registration date : 2008-04-06
| Subject: Re: Kepler News and Results (Thread 2) 8th 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.
_________________ Caps Lock: Cruise control for 'Cool'!
| |
|
| |
Sirius_Alpha Admin
Number of posts : 4319 Location : Earth Registration date : 2008-04-06
| Subject: Re: Kepler News and Results (Thread 2) 21st October 2019, 2:55 pm | |
| _________________ Caps Lock: Cruise control for 'Cool'!
| |
|
| |
PlutonianEmpire Planetesimal
Number of posts : 139 Age : 39 Location : Minnesota Registration date : 2012-01-29
| Subject: Re: Kepler News and Results (Thread 2) 5th November 2019, 4:52 am | |
| - Led_Zep wrote:
- New circumbinary planets !! (ExSS4)
Any extra info on these? _________________ Circumbinary sunset! | |
|
| |
Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: Re: Kepler News and Results (Thread 2) 24th 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/1912.10278The 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! | |
|
| |
Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: Re: Kepler News and Results (Thread 2) 24th December 2019, 2:17 pm | |
| | |
|
| |
Led_Zep SuperJovian
Number of posts : 721 Location : France Registration date : 2011-09-09
| |
| |
Sirius_Alpha Admin
Number of posts : 4319 Location : Earth Registration date : 2008-04-06
| Subject: Re: Kepler News and Results (Thread 2) 10th 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 _________________ Caps Lock: Cruise control for 'Cool'!
| |
|
| |
Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: Re: Kepler News and Results (Thread 2) 27th 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/2001.08362PSR 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? | |
|
| |
tommi59 Jovian
Number of posts : 593 Age : 46 Location : Baile Atha Cliath Registration date : 2010-07-31
| Subject: Re: Kepler News and Results (Thread 2) 13th February 2020, 9:20 am | |
| | |
|
| |
Sponsored content
| Subject: Re: Kepler News and Results (Thread 2) | |
| |
|
| |
| Kepler News and Results (Thread 2) | |
|