Sirius_Alpha Admin
Number of posts : 4320 Location : Earth Registration date : 2008-04-06
| Subject: Constraints on 14 Her c 21st February 2011, 3:26 am | |
| Direct Imaging Constraints on the Putative Exoplanet 14 Her c http://arxiv.org/list/astro-ph.EP/new - Quote :
- We present results of deep direct imaging of the radial velocity (RV) planet-host star 14 Her (=GJ 614, HD 145675), obtained in the \lprime ~band with the Clio-2 camera and the MMT adaptive optics system. This star has one confirmed planet and an unconfirmed outer companion, suggested by residuals in the RV data. The orbital parameters of the unconfirmed object are not well constrained since many mass/semimajor axis configurations can fit the available data. The star has been directly imaged several times, but none of the campaigns has ruled out sub-stellar companions. With \about 2.5 hrs of integration, we rule out at 5$\sigma$ confidence $\gtrsim$ 18 \mj ~companions beyond \about 25 AU, based on the \cite{baraffe} COND mass-luminosity models. Combining our detection limits with fits to the RV data and analytic dynamical analysis, we constrain the orbital parameters of 14 Her c to be: $3 \lesssim m/$\mj ~$\lesssim 42$, $7 \lesssim a/$AU $\lesssim 25$, and $e \lesssim 0.5$. A wealth of information can be obtained from RV/direct imaging overlap, especially with deep imaging as this work shows. The collaboration between RV and direct imaging will become more important in the coming years as the phase space probed by each technique converges. Future studies involving RV/imaging overlap should be sure to consider the effects of a potential planet's projected separation, as quoting limits assuming face-on orientation will be misleading.
It can't stay unconfirmed forever... _________________ Caps Lock: Cruise control for 'Cool'!
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Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: Re: Constraints on 14 Her c 22nd February 2011, 6:42 pm | |
| Have to wonder when the first image of an RV-detected planet will be. There are several possibilities which seem tantalisingly close to detection... | |
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Sirius_Alpha Admin
Number of posts : 4320 Location : Earth Registration date : 2008-04-06
| Subject: Re: Constraints on 14 Her c 22nd February 2011, 7:28 pm | |
| 14 Her c, ε Eri b to name a couple, are there any others? _________________ Caps Lock: Cruise control for 'Cool'!
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Edasich dK star
Number of posts : 2288 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: Re: Constraints on 14 Her c 23rd February 2011, 5:05 am | |
| - Sirius_Alpha wrote:
- 14 Her c, ε Eri b to name a couple, are there any others?
HD 69830? Very challenging... | |
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Sirius_Alpha Admin
Number of posts : 4320 Location : Earth Registration date : 2008-04-06
| Subject: Re: Constraints on 14 Her c 23rd February 2011, 5:14 am | |
| - Edasich wrote:
- Sirius_Alpha wrote:
- 14 Her c, ε Eri b to name a couple, are there any others?
HD 69830? Very challenging... The outermost confirmed planet is less than 1 AU from the star. I doubt it's a candidate for direct imaging any time soon. _________________ Caps Lock: Cruise control for 'Cool'!
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Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: Re: Constraints on 14 Her c 23rd February 2011, 2:48 pm | |
| GJ 849b has been suggested as a potential candidate for direct imaging.
Might also be a few possibilities with other wide-orbit planets (55 Cnc Ad perhaps?) | |
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Sirius_Alpha Admin
Number of posts : 4320 Location : Earth Registration date : 2008-04-06
| Subject: Re: Constraints on 14 Her c 23rd February 2011, 3:04 pm | |
| It looks like 47 UMa d has a fair shot, too. _________________ Caps Lock: Cruise control for 'Cool'!
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