Super-Earth at HD 97658, Neptune at GJ 785

View previous topic View next topic Go down

Super-Earth at HD 97658, Neptune at GJ 785

Post by Sirius_Alpha on 1st November 2010, 8:27 pm

The NASA-UC Eta-Earth Program: III. A Super-Earth orbiting HD 97658 and a Neptune-mass planet orbiting Gl 785
http://arxiv.org/abs/1011.0414

We report the discovery of planets orbiting two bright, nearby early K dwarf stars, HD 97658 and Gl 785. These planets were detected by Keplerian modelling of radial velocities measured with Keck-HIRES for the NASA-UC Eta-Earth Survey. HD 97658 b is a close-in super-Earth with minimum mass Msini = 8.2 +/- 1.2 M_Earth, orbital period P = 9.494 +/- 0.005 d, and an orbit that is consistent with circular. Gl 785 b is a Neptune-mass planet with Msini = 21.6 +/- 2.0 M_Earth, P = 74.39 +/- 0.12 d, and orbital eccentricity 0.30 +/- 0.09. Photometric observations with the T12 0.8 m automatic photometric telescope at Fairborn Observatory show that HD 97658 is photometrically constant at the radial velocity period to 0.09 mmag, supporting the existence of the planet.

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

Number of posts : 3528
Location : Earth
Registration date : 2008-04-06

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

Back to top Go down

Re: Super-Earth at HD 97658, Neptune at GJ 785

Post by Edasich on 2nd November 2010, 6:07 am

Finally a Neptune planet around a Solar neighbour (HR 7722)! Very Happy

That star was so lacking of any exoplanet hints. Research papers only concerning metallicity
avatar
Edasich
dM star
dM star

Number of posts : 1530
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Super-Earth at HD 97658, Neptune at GJ 785

Post by Lazarus on 2nd November 2010, 2:15 pm

So we've found out the identities of Candidates 3 and 7 from the recent Eta Earth planet frequency announcement. Two down, ten more to go...

So it looks like there are lots of planets in the region of parameter space where there are supposed to be very few objects. I suspect this may be because the formation models predict the results of planet formation for single-planet systems, while low-mass planets have a tendency to be in multi-planet systems.
avatar
Lazarus
dG star
dG star

Number of posts : 2894
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Super-Earth at HD 97658, Neptune at GJ 785

Post by Edasich on 2nd November 2010, 4:15 pm

Maybe Sigma Draconis will be one of the next Smile
avatar
Edasich
dM star
dM star

Number of posts : 1530
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

View user profile

Back to top Go down

Re: Super-Earth at HD 97658, Neptune at GJ 785

Post by Sponsored content


Sponsored content


Back to top Go down

View previous topic View next topic Back to top


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