Proxima’s orbit around α Centauri

@article{Kervella2016ProximasOA,
  title={Proxima’s orbit around $\alpha$ Centauri},
  author={Pierre Kervella and F. Th{\'e}venin and Christophe Lovis},
  journal={Astronomy and Astrophysics},
  year={2016},
  volume={598}
}
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… 

Figures and Tables from this paper

Directly testing gravity with Proxima Centauri

  • I. BanikP. Kroupa
  • Physics, Geology
    Monthly Notices of the Royal Astronomical Society
  • 2019
The wide binary orbit of Proxima Centauri around α Centauri A and B differs significantly between Newtonian and Milgromian dynamics (MOND). By combining previous calculations of this effect with

A low-mass planet candidate orbiting Proxima Centauri at a distance of 1.5 AU

TLDR
It is shown that the existence of the planet can be ascertained, and its true mass can be determined with high accuracy, by combining Gaia astrometry and radial velocities, and the candidate planet represents a challenge for the models of super-Earth formation and evolution.

Deceleration of High-velocity Interstellar Photon Sails into Bound Orbits at α Centauri

At a distance of about 4.22 ly, it would take about 100,000 years for humans to visit our closest stellar neighbor Proxima Centauri using modern chemical thrusters. New technologies are now being

ALMA Discovery of Dust Belts around Proxima Centauri

Proxima Centauri, the star closest to our Sun, is known to host at least one terrestrial planet candidate in a temperate orbit. Here we report the Atacama Large Millimeter/submillimeter Array (ALMA)

The gravitational mass of Proxima Centauri measured with SPHERE from a microlensing event

Proxima Centauri, our closest stellar neighbour, is a low-mass M5 dwarf orbiting in a triple system. An Earth-mass planet with an 11 day period has been discovered around this star. The star's mass

Was Proxima captured by Alpha Centauri A and B

The nearest stellar system consists of the stars Proxima, alpha Centauri A and B and at least one planet Proxima b. The habitability of Proxima b and any other planets are likely to be significantly

Searching for the Transit of the Earth-mass Exoplanet Proxima Centauri b in Antarctica: Preliminary Result

Proxima Centauri is known as the closest star to the Sun. Recently, radial velocity (RV) observations revealed the existence of an Earth-mass planet around it. With an orbital period of ∼11 days,

Characterizing the possible interior structures of the nearby Exoplanets Proxima Centauri b and Ross-128 b

We developed a new numerical model to constrain the interior structure of rocky Exoplanets, and applied it to the nearby planets Proxima Centauri b and Ross-128 b. The recently measured elemental

Searching for the near-infrared counterpart of Proxima c using multi-epoch high-contrast SPHERE data at VLT

Context. Proxima Centauri is the closest star to the Sun and it is known to host an Earth-like planet in its habitable zone; very recently a second candidate planet was proposed based on radial

The chemical composition of α Centauri AB revisited

  • T. Morel
  • Physics, Geology
    Astronomy & Astrophysics
  • 2018
The two solar-like stars α Cen A and B have long served as cornerstones for stellar physics in virtue of their immediate proximity, association in a visual binary, and masses that bracket that of the
...

References

SHOWING 1-10 OF 61 REFERENCES

Are Proxima and α Centauri Gravitationally Bound

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 adopt

A terrestrial planet candidate in a temperate orbit around Proxima Centauri

TLDR
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.

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 a

EFFECTS OF PROXIMA CENTAURI ON PLANET FORMATION IN ALPHA CENTAURI

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 that this configuration can form from a

Dynamic status of the wide multiple system α Centauri + Proxima

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, proper

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

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 for

Possible Internal Structures and Compositions of Proxima Centauri b

We explore the possible interiors of Proxima Centauri b, assuming that the planet belongs to the class of dense solid planets (rocky with possible addition of water) and derive the corresponding

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 is

Parallax and masses of α Centauri revisited

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, if

Is Proxima really in orbit about α Cen A/B?

Despite the widespread acceptance that Proxima is in a bound orbit about α Cen A/B, widely quoted kinematic data for these stars do not support such a conclusion. We set radial velocity limits for
...