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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., Author
Amorim, A., Author
Bauböck, M.1, Author           
Berger, J. P., Author
Bonnet, H., Author
Brandner, W., Author
Clénet, Y., Author
Davies, R.1, Author           
de Zeeuw, P. T.1, Author           
Dexter, J.1, Author           
Dallilar, Y.1, Author           
Drescher, A.1, Author           
Eckart, A., Author
Eisenhauer, F.1, Author           
Förster Schreiber, N. M.1, Author           
Garcia, P., Author
Gao, F.1, Author           
Gendron, E., Author
Genzel, R.1, Author           
Gillessen, S.1, Author           
Habibi, M.1, Author           Haubois, X., AuthorHeißel, G., AuthorHenning, T., AuthorHippler, S., AuthorHorrobin, M., AuthorJiménez-Rosales, A.1, Author           Jochum, L., AuthorJocou, L., AuthorKaufer, A., AuthorKervella, P., AuthorLacour, S., AuthorLapeyrère, V., AuthorLe Bouquin, J.-B., AuthorLéna, P., AuthorLutz, D.1, Author           Nowak, M., AuthorOtt, T.1, Author           Paumard, T., AuthorPerraut, K., AuthorPerrin, G., AuthorPfuhl, O.1, Author           Rabien, S.1, Author           Rodríguez-Coira, G., AuthorShangguan, J.1, Author           Shimizu, T.1, Author           Scheithauer, S., AuthorStadler, J., AuthorStraub, O.1, Author           Straubmeier, C., AuthorSturm, E.1, Author           Tacconi, L. J.1, Author           Vincent, F., AuthorFellenberg, S. von1, Author           Waisberg, I.1, Author           Widmann, F.1, Author           Wieprecht, E.1, Author           Wiezorrek, E.1, Author           Woillez, J., AuthorYazici, S.1, Author           Young, A.1, Author           Zins, G., Author more..
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 Abstract: 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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Language(s): eng - English
 Dates: 2021-03-09
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1051/0004-6361/202040208
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 647 Sequence Number: A59 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1