Kepler News and Results (Thread 2)

Page 19 of 19 Previous  1 ... 11 ... 17, 18, 19

View previous topic View next topic Go down

Re: Kepler News and Results (Thread 2)

Post by Edasich on 16th June 2017, 4:06 am

Additional companions to Kepler-448 and Kepler-693 from TTV. The latter turns out hosting both a Hot Jupiter both a close, eccentric stellar companion (mB = 0.143 MSol a = 2.8 or 5.8 AUs e =0.47), so that Kepler-693 b becomes Kepler-693 Ab.

Eccentric Companions to Kepler-448b and Kepler-693b: Clues to the Formation of Warm Jupiters

I report the discovery of non-transiting close companions to two transiting warm Jupiters (WJs), Kepler-448/KOI-12b (orbital period P=17.9days, radius Rp=1.23+0.06−0.05RJup) and Kepler-693/KOI-824b (P=15.4days, Rp=0.91±0.05RJup), via dynamical modeling of their transit timing and duration variations (TTVs and TDVs). The companions have masses of 22+7−5MJup (Kepler-448c) and 150+60−40MJup (Kepler-693c), and both are on eccentric orbits (e=0.65+0.13−0.09 for Kepler-448c and e=0.47+0.11−0.06 for Kepler-693c) with periastron distances of 1.5au. Moderate eccentricities are detected for the inner orbits as well (e=0.34+0.08−0.07 for Kepler-448b and e=0.2+0.2−0.1 for Kepler-693b). In the Kepler-693 system, a large mutual inclination between the inner and outer orbits (53+7−9deg or 134+11−10deg) is also revealed by the TDVs. This is likely to induce a secular oscillation of the inner WJ's eccentricity that brings its periastron close enough to the host star for tidal star-planet interactions to be significant. In the Kepler-448 system, the mutual inclination is weakly constrained and such an eccentricity oscillation is possible for a fraction of the solutions. Thus these WJs may be undergoing tidal migration to become hot Jupiters (HJs), although the migration via this process from beyond the snow line is disfavored by the close-in and massive nature of the companions. This may indicate that WJs can be formed in situ and could even evolve into HJs via high-eccentricity migration inside the snow line.
avatar
Edasich
dM star
dM star

Number of posts : 1509
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Kepler News and Results (Thread 2)

Post by Daniel on 19th June 2017, 1:05 pm



THe final Kepler catalog 2017
avatar
Daniel
SuperEarth
SuperEarth

Number of posts : 238
Registration date : 2009-11-14

View user profile

Back to top Go down

Re: Kepler News and Results (Thread 2)

Post by Daniel on 19th June 2017, 1:24 pm



The New planets candidates in the HZ in the final catalog KOI-8012.01 seems similar in someway with TRAPPIST-1 planets.
avatar
Daniel
SuperEarth
SuperEarth

Number of posts : 238
Registration date : 2009-11-14

View user profile

Back to top Go down

Re: Kepler News and Results (Thread 2)

Post by Led_Zep on 20th June 2017, 4:58 am

NASA press release and briefing materials :

https://www.nasa.gov/press-release/nasa-releases-kepler-survey-catalog-with-hundreds-of-new-planet-candidates


https://www.nasa.gov/ames/kepler/briefing-materials-final-kepler-survey-catalog-of-planet-candidates-in-the-cygnus-field
avatar
Led_Zep
Jovian
Jovian

Number of posts : 516
Location : France
Registration date : 2011-09-09

View user profile

Back to top Go down

Re: Kepler News and Results (Thread 2)

Post by Led_Zep on 11th July 2017, 3:15 pm

https://www.nasa.gov/feature/jpl/hidden-stars-may-make-planets-appear-smaller

Hidden Stars May Make Planets Appear Smaller

« …In the new study, Furlan and Howell focused on 50 planets in the Kepler observatory's field of view whose masses and radii were previously estimated. These planets all orbit stars that have stellar companions within about 1,700 astronomical units. For 43 of the 50 planets, previous reports of their sizes did not take into account the contribution of light from a second star. That means a revision to their reported sizes is necessary.
In most cases, the change to the planets' reported sizes would be small. Previous research showed that 24 of the 50 planets orbit the bigger, brighter star in a binary pair. Moreover, Furlan and Howell determined that 11 of these planets would be too large to be planets if they orbited the fainter companion star. So, for 35 of the 50 planets, the published sizes will not change substantially.
But for 15 of the planets, they could not determine whether they orbit the fainter or the brighter star in a binary pair. For five of the 15 planets, the stars in question are of roughly equal brightness, so their densities will decrease substantially regardless of which star they orbit… »
avatar
Led_Zep
Jovian
Jovian

Number of posts : 516
Location : France
Registration date : 2011-09-09

View user profile

Back to top Go down

Re: Kepler News and Results (Thread 2)

Post by Sirius_Alpha on 13th July 2017, 3:29 pm

Is there a list of the 219 new planet candidates?
Also I'm a bit concerned about some of the planetary radii being reported in the newest update to the KOI catalogue -- some of the planets have reported radii above that of the Sun.

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

Number of posts : 3456
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 19 of 19 Previous  1 ... 11 ... 17, 18, 19

View previous topic View next topic Back to top


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