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Detection of relativistic effects on the S2 orbit with GRAVITY

Published online by Cambridge University Press:  09 February 2017

Marion Grould ,
Frédéric H. Vincent ,
Thibaut Paumard  and
Guy Perrin
Marion Grould
Affiliation:
LESIA, Observatoire de Paris, PSL Research University, CNRS UMR 8109, Université Pierre et Marie Curie, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France email: marion.grould@obspm.fr email: frederic.vincent@obspm.fr email: thibaut.paumard@obspm.fr email: guy.perrin@obspm.fr
Frédéric H. Vincent
Affiliation:
LESIA, Observatoire de Paris, PSL Research University, CNRS UMR 8109, Université Pierre et Marie Curie, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France email: marion.grould@obspm.fr email: frederic.vincent@obspm.fr email: thibaut.paumard@obspm.fr email: guy.perrin@obspm.fr
Thibaut Paumard
Affiliation:
LESIA, Observatoire de Paris, PSL Research University, CNRS UMR 8109, Université Pierre et Marie Curie, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France email: marion.grould@obspm.fr email: frederic.vincent@obspm.fr email: thibaut.paumard@obspm.fr email: guy.perrin@obspm.fr
Guy Perrin
Affiliation:
LESIA, Observatoire de Paris, PSL Research University, CNRS UMR 8109, Université Pierre et Marie Curie, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France email: marion.grould@obspm.fr email: frederic.vincent@obspm.fr email: thibaut.paumard@obspm.fr email: guy.perrin@obspm.fr
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Abstract

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The second generation instrument of the VLTI, GRAVITY, is expected to reach an astrometric accuracy of about 10 μas. It will thus possible to probe the spacetime close to the compact source Sagittarius A* (Sgr A*) at the Galactic Center by using accurate astrometric observations of the second closest star to the Galactic Center, S2. In particular, we show that combining GRAVITY and spectrograph instruments will allow us to detect several relativistic effects such as pericenter advance or the Lense-Thirring effect.

Keywords

Galactic CenterBlack HoleGeneral RelativityS2

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