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Planetesimal Accretion in Binary Systems: Could Planets Form Around Alpha Centauri B ?

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arxiv 1001.2614 v1 pith:QXXXHBBC submitted 2010-01-15 astro-ph.EP astro-ph.HE

Ji-Wei Xie , Ji-Lin Zhou , Jian Ge This is my paper · ORCID
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keywords accretionbinaryalphaplanetesimalsplanetsaroundcenbearth-like
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Stellar perturbations affect planet-formation in binary systems. Recent studies show that the planet-formation stage of mutual accretion of km-sized planetesimals is most sensitive to binary effects. In this paper, the condition for planetesimal accretion is investigated around Alpha CenB, which is believed to be an ideal candidate for detection of an Earth-like planet in or near its habitable zone(0.5-0.9 AU). A simplified scaling method is developed to estimate the accretion timescale of the planetesimals embedded in a protoplanetary disk. Twenty-four cases with different binary inclinations(i_B=0, 0.1, 1.0, and 10 deg), gas densities(0.3,1,and 3 times of the Minimum Mass of Solar Nebula, MMSN hereafter), and with and without gas depletion, are simulated. We find: (1)...(2)...(3)...(4)...(see the paper for details). In other words, our results suggest that formation of Earth-like planets through accretion of km-sized planetesimals is possible in Alpha CenB, while formation of gaseous giant planets is not favorable.

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  1. Planet formation and long-term stability in a very eccentric stellar binary

    astro-ph.EP 2025-01 accept novelty 6.0 of 10

    Long-term N-body simulations indicate that the mini-Neptune TOI 4633c is only stable over the system's 1.3 Gyr age if its orbit is retrograde relative to the highly eccentric stellar binary.

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