# Proxima’s orbit around α Centauri

@article{Kervella2016ProximasOA,
title={Proxima’s orbit around $\alpha$ Centauri},
author={Pierre Kervella and Fr{\'e}d{\'e}ric Th{\'e}venin and Christophe Lovis},
journal={Astronomy and Astrophysics},
year={2016},
volume={598}
}
• Published 2016
• Physics
• Astronomy and Astrophysics
Proxima and α Centauri AB have almost identical distances and proper motions with respect to the Sun. Although the probability of such similar parameters is, in principle, very low, the question as to whether they actually form a single gravitationally bound triple system has been open since the discovery of Proxima one century ago. Owing to HARPS high-precision absolute radial velocity measurements and the recent revision of the parameters of the α Cen pair, we show that Proxima and α Cen are… Expand
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#### References

SHOWING 1-10 OF 61 REFERENCES
The orbit of Proxima Centauri: a MOND versus standard Newtonian distinction
Possible orbits for the motion of Proxima Centauri about α-Centauri A/B are derived according to standard Newtonian conditions and under the Modified Newtonian Dynamics (MOND) paradigm. Likely orbitsExpand
Are Proxima and α Centauri Gravitationally Bound
• Physics
• 2006
Using the most recent kinematic and radial velocity data in the literature, we calculate the binding energy of Proxima Centauri relative to the center of mass of the α Centauri system. When we adoptExpand
A terrestrial planet candidate in a temperate orbit around Proxima Centauri
Observations reveal the presence of a small planet with a minimum mass of about 1.3 Earth masses orbiting Proxima with a period of approximately 11.2 days at a semi-major-axis distance of around 0.05 astronomical units. Expand
The habitability of Proxima Centauri b. I. Irradiation, rotation and volatile inventory from formation to the present
Proxima b is a planet with a minimum mass of 1.3 MEarth orbiting within the habitable zone (HZ) of Proxima Centauri, a very low-mass, active star and the Sun's closest neighbor. Here we investigate aExpand
Dynamic status of the wide multiple system α Centauri + Proxima
• Physics
• 2014
We study the dynamics of a wide multiple system α Centauri + Proxima. The total energy of the system was estimated according to the available observational data on masses, coordinates, properExpand
Effects of Proxima Centauri on Planet Formation in Alpha Centauri
• Physics
• 2016
Proxima Centauri is an M dwarf approximately 15,000 AU from the Alpha Centauri binary, comoving and likely in a loosely bound orbit. Dynamic simulations show this configuration can form from a moreExpand
Close stellar conjunctions of α Centauri A and B until 2050 - An mK = 7.8 star may enter the Einstein ring of α Cen A in 2028
• Physics
• 2016
The rapid proper motion of the α Cen pair (≈ 3.7 arcsec yr −1) and its location close to the galactic plane on a rich stellar background combine constructively to make them excellent candidates forExpand
Possible Internal Structures and Compositions of Proxima Centauri b
• Physics
• 2016
We explore the possible Proxima Centauri b's interiors assuming the planet belongs to the class of dense solid planets (rocky with possible addition of water) and derive the corresponding radii. ToExpand
Proxima Centauri: a transitional modified Newtonian dynamics controlled orbital candidate?
The triple-system candidacy of Proxima Centauri with α Centauri A/B is reviewed in terms of its potential to demonstrate an orbit controlled according to modified Newtonian dynamics (MOND). It isExpand
Parallax and masses of α Centauri revisited
• Physics
• 2016
Context. Despite the thorough work of van Leeuwen (2007), the parallax of alpha Centauri is still far from being carved in stone. Any derivation of the individual masses is therefore uncertain, ifExpand