Статья

Improved GRAVITY astrometric accuracy from modeling optical aberrations

R. AbuterEuropean Southern Observatory, Karl-Schwarzschild-Strae 2, 85748 Garching, GermanyA. AmorimCENTRA -Centro de Astrofsica e Gravitao, IST, Universidade de Lisboa, 1049-001 Lisboa, PortugalM. BauböckJ. P. BergerEuropean Southern Observatory, Karl-Schwarzschild-Strae 2, 85748 Garching, GermanyH. BonnetEuropean Southern Observatory, Karl-Schwarzschild-Strae 2, 85748 Garching, GermanyW. BrandnerMax Planck Institute for Astronomy, Knigstuhl 17, 69117 Heidel-berg, GermanyY. ClénetR. DaviesP. T. de ZeeuwJ. DexterDepartment of Astrophysical & Planetary Sciences, JILA, Duane Physics Bldg., 2000 Colorado Ave,Y. DallilarA. DrescherDepartment of Physics, Technical University Munich, James-Franck-Strae 1, 85748 Garching, GermanyA. Eckart1st Institute of Physics, University of Cologne, Zlpicher Strae 77, 50937 Cologne, GermanyF. EisenhauerN. M. Förster SchreiberP. GarciaCENTRA -Centro de Astrofsica e Gravitao, IST, Universidade de Lisboa, 1049-001 Lisboa, PortugalF. GaoE. GendronLESIA, Observatoire de Paris, Universit PSL, CNRS, Sorbonne Universit, Universit de Paris, 5 place Jules Janssen, 92195 Meudon, FranceR. GenzelDepartments of Physics and Astronomy, Le Conte Hall, University of California, Berkeley, CA 94720, USAS. GillessenM. HabibiX. HauboisEuropean Southern Observatory, Casilla 19001, Santiago 19, ChileG. HeißelLESIA, Observatoire de Paris, Universit PSL, CNRS, Sorbonne Universit, Universit de Paris, 5 place Jules Janssen, 92195 Meudon, FranceT. HenningMax Planck Institute for Astronomy, Knigstuhl 17, 69117 Heidel-berg, GermanyS. HipplerMax Planck Institute for Astronomy, Knigstuhl 17, 69117 Heidel-berg, GermanyM. Horrobin1st Institute of Physics, University of Cologne, Zlpicher Strae 77, 50937 Cologne, GermanyA. Jiménez-RosalesL. JochumEuropean Southern Observatory, Casilla 19001, Santiago 19, ChileL. JocouUniv. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, FranceA. KauferEuropean Southern Observatory, Casilla 19001, Santiago 19, ChileP. KervellaLESIA, Observatoire de Paris, Universit PSL, CNRS, Sorbonne Universit, Universit de Paris, 5 place Jules Janssen, 92195 Meudon, FranceS. LacourLESIA, Observatoire de Paris, Universit PSL, CNRS, Sorbonne Universit, Universit de Paris, 5 place Jules Janssen, 92195 Meudon, FranceV. LapeyrèreJ.-B. Le BouquinUniv. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, FranceP. LénaD. LutzM. NowakInstitute of Astronomy, Madingley Road, Cambridge CB3 0HA, UKT. OttT. PaumardLESIA, Observatoire de Paris, Universit PSL, CNRS, Sorbonne Universit, Universit de Paris, 5 place Jules Janssen, 92195 Meudon, FranceK. PerrautUniv. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, FranceG. PerrinLESIA, Observatoire de Paris, Universit PSL, CNRS, Sorbonne Universit, Universit de Paris, 5 place Jules Janssen, 92195 Meudon, FranceO. PfuhlEuropean Southern Observatory, Karl-Schwarzschild-Strae 2, 85748 Garching, GermanyS. RabienG. Rodríguez-CoiraJ. ShangguanT. ShimizuS. ScheithauerMax Planck Institute for Astronomy, Knigstuhl 17, 69117 Heidel-berg, GermanyJ. StadlerO. StraubC. Straubmeier1st Institute of Physics, University of Cologne, Zlpicher Strae 77, 50937 Cologne, GermanyE. SturmL. J. TacconiF. VincentLESIA, Observatoire de Paris, Universit PSL, CNRS, Sorbonne Universit, Universit de Paris, 5 place Jules Janssen, 92195 Meudon, FranceS. von FellenbergI. WaisbergF. WidmannE. WieprechtE. WiezorrekJ. WoillezEuropean Southern Observatory, Karl-Schwarzschild-Strae 2, 85748 Garching, GermanyS. Yazici1st Institute of Physics, University of Cologne, Zlpicher Strae 77, 50937 Cologne, GermanyA. YoungG. ZinsEuropean Southern Observatory, Casilla 19001, Santiago 19, Chile

2021en

ABI

Аннотация

The GRAVITY instrument on the ESO VLTI pioneers the field of high-precision near-infrared interferometry by providing astrometry at the 10−100 μ as 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 R 0 to the Galactic Center that were reported previously.

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Идентификаторы

DOI: 10.1051/0004-6361/202040208

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar