A crowded multi-planet system around HD 34445

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A crowded multi-planet system around HD 34445

Post by Edasich on 13th October 2017, 4:46 am

Just incredible!  Very Happy

A Six-planet System around the Star HD 34445

We present a new precision radial velocity (RV) data set that reveals a multi-planet system orbiting the G0V star HD 34445. Our 18-year span consists of 333 precision RV observations, 56 of which were previously published and 277 of which are new data from the Keck Observatory, Magellan at Las Campanas Observatory, and the Automated Planet Finder at Lick Observatory. These data indicate the presence of six planet candidates in Keplerian motion about the host star with periods of 1057, 215, 118, 49, 677, and 5700 days, and minimum masses of 0.63, 0.17, 0.1, 0.05, 0.12, and 0.38 M J, respectively. The HD 34445 planetary system, with its high degree of multiplicity, its long orbital periods, and its induced stellar RV half-amplitudes in the range 2 m s−1 lesssim K lesssim 5 m s−1 is fundamentally unlike either our own solar system (in which only Jupiter and Saturn induce significant reflex velocities for the Sun), or the Kepler multiple-transiting systems (which tend to have much more compact orbital configurations).
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Re: A crowded multi-planet system around HD 34445

Post by Sirius_Alpha on 13th October 2017, 6:22 am

Wow!

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Re: A crowded multi-planet system around HD 34445

Post by Tabby on 13th October 2017, 1:14 pm

Interesting!
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Re: A crowded multi-planet system around HD 34445

Post by Lazarus on 21st October 2017, 1:58 pm

I guess the estimated eccentricity of HD 34445 b will end up decreasing. Hopefully the long-period signal doesn't turn out to be an activity cycle.
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Re: A crowded multi-planet system around HD 34445

Post by Sirius_Alpha Yesterday at 10:16 pm


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Re: A crowded multi-planet system around HD 34445

Post by Edasich Today at 6:44 am

I see, but lately EPE is taking very long to update exoplanet list and up to date there are tens of missing confirmed/validated exoplanets. Rolling Eyes
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Re: A crowded multi-planet system around HD 34445

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