First circumbinary planets orbiting Main Sequence stars?

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First circumbinary planets orbiting Main Sequence stars?

Post by Borislav on 28th August 2010, 5:53 am

http://www4.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/cadcbin/gsa/wdbi.cgi/gsa/gsa_science_program/more/GN-2010A-DD-6

With near-infrared photometry and spectra, we propose to observe a close pair of candidate planetary mass companions orbiting a binary A-star. If spectroscopically confirmed as L-type objects, these companions would be the first circumbinary planets orbiting Main Sequence stars. Comparison of the absolute K-band magnitudes with evolutionary models suggests masses of ~5Mjup and ~6Mjup, among the lowest mass planets imaged to date. The companions were detected as part of our volume-limited survey of A-stars within 75pc (GN-2008B-Q-119, PI: Patience) and second epoch observations were recently obtained (GN-2010A-Q-99, PI: De Rosa), indicating that the companions have a proper motion more consistent with the primary than a background object. The youth of the system, 30Myr, combined with the ~4?.5 separation of the companions enabled the detection of these intriguing objects in our snaphot survey. If confirmed, the entire system presents a very interesting case study in the diversity of planetary architectures: the host star is in an eccentric 11-day orbit and is surrounded by a debris disk estimated to be ~30AU in radius, and, at a projected separation of ~250AU, are a pair of planetary mass companions separated from each other by ~10AU.

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Re: First circumbinary planets orbiting Main Sequence stars?

Post by Sirius_Alpha on 28th August 2010, 6:15 am

Would also be the first example of a binary planet, as well. Though of course, these objects probably formed in the same mechanism responsible for brown dwarfs.

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Re: First circumbinary planets orbiting Main Sequence stars?

Post by Borislav on 28th August 2010, 9:07 am


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Re: First circumbinary planets orbiting Main Sequence stars?

Post by Edasich on 28th August 2010, 11:31 am


Man, it was more immediate typing Iota Delphini. So we're also dealing with a notable star. cyclops
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Re: First circumbinary planets orbiting Main Sequence stars?

Post by Edasich on 28th August 2010, 3:01 pm

Plus outer limit of hill radius for the first planet lies within 25 AUs (with a 2 Msun star at 250 AUs). Though we'd be dealing with binary planet either Trojan exoplanets.
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