Kepler News and Results (Thread 2)

Page 20 of 20 Previous  1 ... 11 ... 18, 19, 20

Go down

Re: Kepler News and Results (Thread 2)

Post by Lazarus on 14th May 2018, 3:26 pm

Do you like phase curves? If so, here's some good news!

Kipping, Sandford & Janesen "Two Thousand Kepler Phase Curves from Phasma"
https://arxiv.org/abs/1805.04121

Gallery is here.
avatar
Lazarus
dF star
dF star

Number of posts : 3017
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Kepler News and Results (Thread 2)

Post by Lazarus on 24th May 2018, 2:04 pm

Kepler-503 turns out to be a subgiant rather than a solar-type dwarf star as previously thought. The companion Kepler-503b is at the hydrogen-burning limit.

Cañas et al. "Kepler-503b: An Object at the Hydrogen Burning Mass Limit Orbiting a Subgiant Star"
https://arxiv.org/abs/1805.08820
avatar
Lazarus
dF star
dF star

Number of posts : 3017
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 13th June 2018, 9:09 pm

Update on the exomoon candidate at Kepler-1625b (do we not have a thread for this?)

Reanalysis of data favors the planet-moon model over the single-planet, but the significance of the evidence depends pretty strongly on how you detrend the data. The evidence is not convincing enough at this point to positively claim a detection, though this could be remedied with more data.

Revisiting the exomoon candidate signal around Kepler-1625b
https://arxiv.org/abs/1806.04672

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3709
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: Kepler News and Results (Thread 2)

Post by Lazarus on 14th June 2018, 5:48 pm

Sirius_Alpha wrote:Update on the exomoon candidate at Kepler-1625b (do we not have a thread for this?)

Reanalysis of data favors the planet-moon model over the single-planet, but the significance of the evidence depends pretty strongly on how you detrend the data. The evidence is not convincing enough at this point to positively claim a detection, though this could be remedied with more data.

Revisiting the exomoon candidate signal around Kepler-1625b
https://arxiv.org/abs/1806.04672
David Kipping posted a response on Twitter here

Will be interesting to see what the HST data brings to this.
avatar
Lazarus
dF star
dF star

Number of posts : 3017
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 2nd July 2018, 9:00 pm

The orbital eccentricity of small planet systems
https://arxiv.org/abs/1807.00549

We determine the orbital eccentricities of individual small Kepler planets, through a combination of asteroseismology and transit light-curve analysis. We are able to constrain the eccentricities of 51 systems with a single transiting planet, which supplement our previous measurements of 66 planets in multi-planet systems. Through a Bayesian hierarchical analysis, we find evidence that systems with only one detected transiting planet have a different eccentricity distribution than systems with multiple detected transiting planets. The eccentricity distribution of the single-transiting systems is well described by the positive half of a zero-mean Gaussian distribution with a dispersion σe=0.32±0.06, while the multiple-transit systems are consistent with σe=0.083+0.015−0.020. A mixture model suggests a fraction of 0.76+0.21−0.12 of single-transiting systems have a moderate eccentricity, represented by a Rayleigh distribution that peaks at 0.26+0.04−0.06. This finding may reflect differences in the formation pathways of systems with different numbers of transiting planets. We investigate the possibility that eccentricities are "self-excited" in closely packed planetary systems, as well as the influence of long-period giant companion planets. We find that both mechanisms can qualitatively explain the observations. We do not find any evidence for a correlation between eccentricity and stellar metallicity, as has been seen for giant planets. Neither do we find any evidence that orbital eccentricity is linked to the detection of a companion star. Along with this paper we make available all of the parameters and uncertainties in the eccentricity distributions, as well as the properties of individual systems, for use in future studies.

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3709
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 8th July 2018, 8:43 pm

TTV-determined Masses for Warm Jupiters and their Close Planetary Companions
https://arxiv.org/abs/1807.02217

Although the formation and the properties of hot Jupiters (with orbital periods P<10d) have attracted a great deal of attention, the origins of warm Jupiters (10<P<100d) are less well-studied. Using a transit timing analysis, we present the orbital parameters of five planetary systems containing warm Jupiters, Kepler 30, Kepler 117, Kepler 302, Kepler 487 and Kepler 418. Three of them, Kepler-30 c(Mp=549.4±5.6M⊕), Kepler-117 c(Mp=702±63M⊕) and Kepler 302 c(Mp=933±527M⊕), are confirmed to be real warm Jupiters based on their mass. Insights drawn from the radius-temperature relationship lead to the inference that hot Jupiters and warm Jupiters can be roughly separated by Teff,c=1123.7±3.3 K. Also, Teff,c provides a good separation for Jupiters with companion fraction consistent with zero(Teff>Teff,c) and those with companion fraction significantly different from zero (Teff<Teff,c).

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3709
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: Kepler News and Results (Thread 2)

Post by Lazarus on 12th September 2018, 4:02 pm

I don't think this one's hit the arXiv so far...

Brady et al. (2018) "Kepler-1656b: A Dense Sub-Saturn with an Extreme Eccentricity"
http://iopscience.iop.org/article/10.3847/1538-3881/aad773/meta

32-day orbital period, eccentricity 0.84
avatar
Lazarus
dF star
dF star

Number of posts : 3017
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 24th September 2018, 9:26 pm

Now on arXiv.

Kepler-1656b: a Dense Sub-Saturn With an Extreme Eccentricity
https://arxiv.org/abs/1809.08436


_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3709
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: Kepler News and Results (Thread 2)

Post by Sponsored content


Sponsored content


Back to top Go down

Page 20 of 20 Previous  1 ... 11 ... 18, 19, 20

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum