Scalar field effects on the orbit of S2 star

Amorim, A.; Bauböck, M.; Benisty, M.; Berger, J.-P.; Clénet, Y.; du Forest, V. Coudé; Zeeuw, T.; Dexter, J.; Duvert, G.; Eckart, A.; Eisenhauer, F.; Ferreira, Miguel C.; Gao, F.; Garcia, Paulo J. V.; Gendron, E.; Genzel, R.; Gillessen, S.; Gordo, P.; Habibi, M.; Horrobin, M.; Jimenez Rosales, A.; Jocou, L.; Kervella, P.; Lacour, S.; Le Bouquin, J.-B.; Léna, P.; Ott, T.; Pössel, M.; Paumard, T.; Perraut, K.; Perrin, G.; Pfuhl, O.; Coira, G. Rodriguez; Rousset, G.; Straub, O.; Straubmeier, C.; Sturm, E.; Vincent, F.; Fellenberg, S. von; Waisberg, I.; Widmann, F.

doi:10.1093/mnras/stz2300

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Scalar field effects on the orbit of S2 star

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Bauböck, M.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons225865

Zeeuw, T.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons146381

Dexter, J.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4766

Eisenhauer, F.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons214427

Gao, F.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4590

Genzel, R.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4768

Gillessen, S.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons181377

Habibi, M.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons216133

Jimenez Rosales, A.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons231012

Lacour, S.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons16190

Ott, T.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4782

Pfuhl, O.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons232635

Straub, O.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4650

Sturm, E.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons206120

Fellenberg, S. von
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons188252

Waisberg, I.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons214431

Widmann, F.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Amorim, A., Bauböck, M., Benisty, M., Berger, J.-P., Clénet, Y., du Forest, V. C., et al. (2019). Scalar field effects on the orbit of S2 star. Monthly Notices of the Royal Astronomical Society, 489(4), 4606-4621. doi:10.1093/mnras/stz2300.

Cite as: https://hdl.handle.net/21.11116/0000-0005-4DF8-E

Abstract

Precise measurements of the S-stars orbiting SgrA* have set strong constraints on the nature of the compact object at the centre of the Milky Way. The presence of a black hole in that region is well established, but its neighbouring environment is still an open debate. In that respect, the existence of dark matter in that central region may be detectable due to its strong signatures on the orbits of stars: the main effect is a Newtonian precession which will affect the overall pericentre shift of S2, the latter being a target measurement of the GRAVITY instrument. The exact nature of this dark matter (e.g. stellar dark remnants or diffuse dark matter) is unknown. This article assumes it to be a scalar field of toroidal distribution, associated with ultralight dark matter particles, surrounding the Kerr black hole. Such a field is a form of ‘hair’ expected in the context of superradiance, a mechanism that extracts rotational energy from the black hole. Orbital signatures for the S2 star are computed and shown to be detectable by GRAVITY. The scalar field can be constrained because the variation of orbital elements depends both on the relative mass of the scalar field to the black hole and on the field mass coupling parameter.