Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: What is the mass of alpha Cen B b?   We investigate the possibility of constraining the sin i degeneracy of alpha
Cen B b -- with orbital period P=3.24 d; a = 0.042 AU; msini = 1.1 M_earth --
to estimate the true mass of the newly reported terrestrial exoplanet in the
nearest stellar system to our Sun. We present detailed numerical simulations of
the dynamical stability of the exoplanet in the alpha Cen AB binary system for
a range of initial inclinations, eccentricities, and semi-major axes. The
system represents a benchmark case for the interplay of the Kozai mechanism,
general relativistic and tidal forces. From our simulations, there is only a
small boundary in initial inclinations and initial semi-major axes that result
in the migration via the Kozai mechanism of alpha Cen B b to its present
location. Inside this boundary, the planet orbit is stable for up to 1 Gyr
against the Kozai mechanism, and outside this boundary the planet collides with
alpha Cen B or is ejected. In our three simulations where the planet migrates
in towards the star via the Kozai mechanism, the final inclination is 46-53
degrees relative to the AB orbital plane, lower than the initial inclination of
75 degrees in each case. We discuss inclination constraints from the formation
of alpha Cen B b in situ at its present location, migration in a
proto-planetary disk, or migration in resonance with additional planets. We
conclude that alpha Cen B b probably has a mass of less than 2.7 M_earth,
implying a likely terrestrial composition warranting future confirmation.

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The categories of this paper are: q-fin
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The categories of this paper are: math
22
The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: nlin
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: econ
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The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph