Long Period Jovian at GJ 328

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Long Period Jovian at GJ 328

Post by Sirius_Alpha on 29th July 2013, 8:26 pm

Secretly Eccentric: The Giant Planet and Activity Cycle of GJ 328

We announce the discovery of a ~2 Jupiter-mass planet in an eccentric 11-year orbit around the K7/M0 dwarf GJ 328. Our result is based on 10 years' worth of radial velocity (RV) data from the Hobby-Eberly and Harlan J. Smith telescopes at McDonald Observatory, and from the Keck Telescope at Mauna Kea. Our analysis of GJ 328's magnetic activity via the Na I D features reveals a long-period stellar activity cycle, which creates an additional signal in the star's RV curve with amplitude 6-10 m/s. After correcting for this stellar RV contribution, we see that the orbit of the planet is more eccentric than suggested by the raw RV data. GJ 328b is currently the most massive, longest-period planet discovered around a low-mass dwarf.

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Re: Long Period Jovian at GJ 328

Post by Lazarus on 30th July 2013, 6:05 pm

More hints that there's a lot of interesting stuff going on in planetary systems beyond the ice line to a few tens of AU, where it is frustratingly difficult to detect planets.

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