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  Improved GRAVITY astrometric accuracy from modeling optical aberrations

Abuter, R., Amorim, A., Bauböck, M., Berger, J. P., Bonnet, H., Brandner, W., et al. (2021). Improved GRAVITY astrometric accuracy from modeling optical aberrations. Astronomy and Astrophysics, 647: A59. doi:10.1051/0004-6361/202040208.

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Abuter, R., Autor
Amorim, A., Autor
Bauböck, M.1, Autor           
Berger, J. P., Autor
Bonnet, H., Autor
Brandner, W., Autor
Clénet, Y., Autor
Davies, R.1, Autor           
de Zeeuw, P. T.1, Autor           
Dexter, J.1, Autor           
Dallilar, Y.1, Autor           
Drescher, A.1, Autor           
Eckart, A., Autor
Eisenhauer, F.1, Autor           
Förster Schreiber, N. M.1, Autor           
Garcia, P., Autor
Gao, F.1, Autor           
Gendron, E., Autor
Genzel, R.1, Autor           
Gillessen, S.1, Autor           
Habibi, M.1, Autor           Haubois, X., AutorHeißel, G., AutorHenning, T., AutorHippler, S., AutorHorrobin, M., AutorJiménez-Rosales, A.1, Autor           Jochum, L., AutorJocou, L., AutorKaufer, A., AutorKervella, P., AutorLacour, S., AutorLapeyrère, V., AutorLe Bouquin, J.-B., AutorLéna, P., AutorLutz, D.1, Autor           Nowak, M., AutorOtt, T.1, Autor           Paumard, T., AutorPerraut, K., AutorPerrin, G., AutorPfuhl, O.1, Autor           Rabien, S.1, Autor           Rodríguez-Coira, G., AutorShangguan, J.1, Autor           Shimizu, T.1, Autor           Scheithauer, S., AutorStadler, J., AutorStraub, O.1, Autor           Straubmeier, C., AutorSturm, E.1, Autor           Tacconi, L. J.1, Autor           Vincent, F., AutorFellenberg, S. von1, Autor           Waisberg, I.1, Autor           Widmann, F.1, Autor           Wieprecht, E.1, Autor           Wiezorrek, E.1, Autor           Woillez, J., AutorYazici, S.1, Autor           Young, A.1, Autor           Zins, G., Autor mehr..
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 Zusammenfassung: The GRAVITY instrument on the ESO VLTI pioneers the field of high-precision near-infrared interferometry by providing astrometry at the 10−100 μas level. Measurements at this high precision crucially depend on the control of systematic effects. We investigate how aberrations introduced by small optical imperfections along the path from the telescope to the detector affect the astrometry. We develop an analytical model that describes the effect of these aberrations on the measurement of complex visibilities. Our formalism accounts for pupil-plane and focal-plane aberrations, as well as for the interplay between static and turbulent aberrations, and it successfully reproduces calibration measurements of a binary star. The Galactic Center observations with GRAVITY in 2017 and 2018, when both Sgr A* and the star S2 were targeted in a single fiber pointing, are affected by these aberrations at a level lower than 0.5 mas. Removal of these effects brings the measurement in harmony with the dual-beam observations of 2019 and 2020, which are not affected by these aberrations. This also resolves the small systematic discrepancies between the derived distance R0 to the Galactic Center that were reported previously.

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Sprache(n): eng - English
 Datum: 2021-03-09
 Publikationsstatus: Online veröffentlicht
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 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1051/0004-6361/202040208
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Titel: Astronomy and Astrophysics
  Andere : Astron. Astrophys.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: France : EDP Sciences S A
Seiten: - Band / Heft: 647 Artikelnummer: A59 Start- / Endseite: - Identifikator: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1