Constraints on 14 Her c

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Constraints on 14 Her c

Post by Sirius_Alpha on 21st February 2011, 3:26 am

Direct Imaging Constraints on the Putative Exoplanet 14 Her c
http://arxiv.org/list/astro-ph.EP/new

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...

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Re: Constraints on 14 Her c

Post by Lazarus on 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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Re: Constraints on 14 Her c

Post by Sirius_Alpha on 22nd February 2011, 7:28 pm

14 Her c, ε Eri b to name a couple, are there any others?

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Re: Constraints on 14 Her c

Post by Edasich on 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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Re: Constraints on 14 Her c

Post by Sirius_Alpha on 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.

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Re: Constraints on 14 Her c

Post by Lazarus on 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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Re: Constraints on 14 Her c

Post by Sirius_Alpha on 23rd February 2011, 3:04 pm

It looks like 47 UMa d has a fair shot, too.

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