Astronomy and Astrophysics – Astrophysics – Earth and Planetary Astrophysics
Scientific paper
2009-03-20
Astronomy and Astrophysics
Astrophysics
Earth and Planetary Astrophysics
11 pages, 2 figures, accepted to Astrophysical Journal letters
Scientific paper
10.1088/0004-637X/695/2/L181
We study the dynamical stability of an additional, potentially habitable planet in the HD 47186 planetary system. Two planets are currently known in this system: a "hot Neptune" with a period of 4.08 days and a Saturn-mass planet with a period of 3.7 years. Here we consider the possibility that one or more undetected planets exist between the two known planets and possibly within the habitable zone in this system. Given the relatively low masses of the known planets, additional planets could have masses $\lsim 10 \mearth$, and hence be terrestrial-like and further improving potential habitability. We perform $N$-body simulations to identify the stable zone between planets $b$ and $c$ and find that much of the inner habitable zone can harbor a $10 \mearth$ planet. With the current radial-velocity threshold of $\sim 1$ m/s, an additional planet should be detectable if it lies at the inner edge of the habitable zone at 0.8 AU. We also show that the stable zone could contain two additional planets of $10 \mearth$ each if their eccentricities are lower than $\sim 0.3$.
Barnes Rory
Kopparapu Ravi Kumar
Raymond Sean N.
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