Extrasolar Visions II
Would you like to react to this message? Create an account in a few clicks or log in to continue.

Extrasolar Visions II

Extrasolar Planets.
 
HomeHome  SearchSearch  Latest imagesLatest images  RegisterRegister  Planet TablePlanet Table  Log in  

 

 KOI-94 - Four transiting Planets

Go down 
5 posters
AuthorMessage
Sirius_Alpha
Admin
Admin
Sirius_Alpha


Number of posts : 4319
Location : Earth
Registration date : 2008-04-06

KOI-94 - Four transiting Planets Empty
PostSubject: Re: KOI-94 - Four transiting Planets   KOI-94 - Four transiting Planets Empty21st September 2012, 12:30 am


_________________
Caps Lock: Cruise control for 'Cool'!
Back to top Go down
https://solar-flux.forumotion.com/
Lazarus
dF star
dF star



Number of posts : 3337
Registration date : 2008-06-12

KOI-94 - Four transiting Planets Empty
PostSubject: Re: KOI-94 - Four transiting Planets   KOI-94 - Four transiting Planets Empty21st September 2012, 6:07 pm

A planet-planet eclipse? Very nice. Not sure that has been observed in any of the other multi-transit systems.
Back to top Go down
Sirius_Alpha
Admin
Admin
Sirius_Alpha


Number of posts : 4319
Location : Earth
Registration date : 2008-04-06

KOI-94 - Four transiting Planets Empty
PostSubject: Re: KOI-94 - Four transiting Planets   KOI-94 - Four transiting Planets Empty21st September 2012, 9:26 pm

I don't believe it has.

_________________
Caps Lock: Cruise control for 'Cool'!
Back to top Go down
https://solar-flux.forumotion.com/
tommi59
Jovian
Jovian
tommi59


Number of posts : 593
Age : 46
Location : Baile Atha Cliath
Registration date : 2010-07-31

KOI-94 - Four transiting Planets Empty
PostSubject: Re: KOI-94 - Four transiting Planets   KOI-94 - Four transiting Planets Empty22nd September 2012, 4:27 am

Why you do not believe?
Back to top Go down
Edasich
dK star
dK star
Edasich


Number of posts : 2267
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

KOI-94 - Four transiting Planets Empty
PostSubject: Re: KOI-94 - Four transiting Planets   KOI-94 - Four transiting Planets Empty22nd September 2012, 10:30 am

tommi59 wrote:
Why you do not believe?

I suppose Sirius isn't sure the planet-planet eclipse has been observed before KOI-94's case. Rolling Eyes
Back to top Go down
tommi59
Jovian
Jovian
tommi59


Number of posts : 593
Age : 46
Location : Baile Atha Cliath
Registration date : 2010-07-31

KOI-94 - Four transiting Planets Empty
PostSubject: Re: KOI-94 - Four transiting Planets   KOI-94 - Four transiting Planets Empty22nd September 2012, 12:29 pm

Was not observed but might be this case
Back to top Go down
Sirius_Alpha
Admin
Admin
Sirius_Alpha


Number of posts : 4319
Location : Earth
Registration date : 2008-04-06

KOI-94 - Four transiting Planets Empty
PostSubject: Re: KOI-94 - Four transiting Planets   KOI-94 - Four transiting Planets Empty22nd September 2012, 4:59 pm

Lazarus was stating
Quote :
Not sure that has been observed in any of the other multi-transit systems.
And I was agreeing with him, to the best extent of my memory.

_________________
Caps Lock: Cruise control for 'Cool'!
Back to top Go down
https://solar-flux.forumotion.com/
pochimax
Planetary Embryo
Planetary Embryo
pochimax


Number of posts : 89
Location : Torrejon, Spain
Registration date : 2011-09-09

KOI-94 - Four transiting Planets Empty
PostSubject: KOI-94 - Four transiting Planets   KOI-94 - Four transiting Planets Empty23rd September 2012, 3:42 am

And the paper shows that the farther from the star the easier to detect the rossiter effect (well, in comparison with the orbital RV). good news to confirm superearth planets in the HZ.
Back to top Go down
Sirius_Alpha
Admin
Admin
Sirius_Alpha


Number of posts : 4319
Location : Earth
Registration date : 2008-04-06

KOI-94 - Four transiting Planets Empty
PostSubject: Re: KOI-94 - Four transiting Planets   KOI-94 - Four transiting Planets Empty11th March 2013, 8:37 pm

The Mass of KOI-94d and a Relation for Planet Radius, Mass, and Incident Flux
http://arxiv.org/abs/1303.2150

Quote :
We measure the mass of a modestly irradiated giant planet, KOI-94d. We wish to determine whether this planet, which is in a 22-day orbit and receives 2700 times as much incident flux as Jupiter, is as dense as Jupiter or rarefied like inflated hot Jupiters. KOI-94 also hosts 3 smaller transiting planets, all of which were detected by the Kepler Mission. With 26 radial velocities of KOI-94 from the W. M. Keck Observatory and a simultaneous fit to the Kepler light curve, we measure the mass of the giant planet and determine that it is not inflated. Support for the planetary interpretation of the other three candidates comes from gravitational interactions through transit timing variations, the statistical robustness of multi-planet systems against false positives, and several lines of evidence that no other star resides within the photometric aperture. The radial velocity analyses of KOI-94b and KOI-94e offer marginal (>2\sigma) mass detections, whereas the observations of KOI-94c offer only an upper limit to its mass. Using the KOI-94 system and other planets with published values for both mass and radius (138 exoplanets total, including 35 with M < 150 Earth masses), we establish two fundamental planes for exoplanets that relate their mass, incident flux, and radius from a few Earth masses up to ten Jupiter masses. These equations can be used to predict the radius or mass of a planet.

_________________
Caps Lock: Cruise control for 'Cool'!
Back to top Go down
https://solar-flux.forumotion.com/
Lazarus
dF star
dF star



Number of posts : 3337
Registration date : 2008-06-12

KOI-94 - Four transiting Planets Empty
PostSubject: Re: KOI-94 - Four transiting Planets   KOI-94 - Four transiting Planets Empty12th March 2013, 2:13 pm

KOI-94b looks like it could be quite a dense planet (though the error bar is large, as noted the mass detection is marginal). Haven't checked where the proposed parameters lie on the composition diagram though.
Back to top Go down
Lazarus
dF star
dF star



Number of posts : 3337
Registration date : 2008-06-12

KOI-94 - Four transiting Planets Empty
PostSubject: Re: KOI-94 - Four transiting Planets   KOI-94 - Four transiting Planets Empty23rd October 2013, 1:23 pm

Also relevant to KOI-94: this post

Characterization of the KOI-94 System with Transit Timing Variation Analysis: Implication for the Planet-Planet Eclipse
http://arxiv.org/abs/1310.5771

Some points from the conclusion:
Quote :
  1. Although the RV analysis results in a fairly large eccentricity for KOI-94c (ec = 0.43 ± 0.23), the TTVs indicate a significantly smaller value. In fact, the stability analysis of the system favors the TTV result.
  2. The TTV best-fit value of md differs from the RV result md = 106 ± 11M by ∼ 4σ level. If the TTV value is correct, KOI-94d may be inflated, in contrast to the conclusion obtained by Weiss et al. (2013).
  3. The TTV of the outermost planet KOI-94e is not well reproduced in the current modeling with the three planets. This might suggest the presence of additional planets and/or minor bodies that have evaded the detection so far.
Next planet-planet eclipse is predicted to occur in April 2026.
Back to top Go down
Sponsored content





KOI-94 - Four transiting Planets Empty
PostSubject: Re: KOI-94 - Four transiting Planets   KOI-94 - Four transiting Planets Empty

Back to top Go down
 
KOI-94 - Four transiting Planets
Back to top 
Page 1 of 1
 Similar topics
-
» Two populations of transiting planets?
» Limits on moons to transiting planets
» New Book on Transiting Planets
» Transiting planets in NGC 6253?
» Looking for transiting planets in the HZ of GJ 1214

Permissions in this forum:You cannot reply to topics in this forum
Extrasolar Visions II :: Extrasolar Visions :: Extrasolar News and Discoveries-
Jump to: