Pith. sign in

REVIEW 4 cited by

Improved GRAVITY astrometric accuracy from modeling of optical aberrations

Not yet reviewed by Pith; the record is open.

Re-run · record.json Download PDF Read on arXiv ↗

This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.

SPECIMEN: schema-true, not a live event

T0 review · schema-true

One-sentence machine reading of the paper's core claim.

pith:XXXXXXXX · record.json · timestamp

arxiv 2101.12098 v1 pith:L4QSSXLC submitted 2021-01-28 astro-ph.GA astro-ph.IM

GRAVITY Collaboration , R. Abuter , A. Amorim , M. Bauböck , J.P. Berger , H. Bonnet , W. Brandner , Y. Clénet
show 55 more authors
R. Davies P.T. de Zeeuw J. Dexter Y. Dallilar A. Drescher A. Eckart F. Eisenhauer N.M. Förster Schreiber P. Garcia F. Gao E. Gendron R. Genzel S. Gillessen M. Habibi X. Haubois G. Hei{ss}el T. Henning S. Hippler M. Horrobin A. Jiménez-Rosales L. Jochum L. Jocou A. Kaufer P. Kervella S. Lacour V. Lapeyrère J.-B. Le Bouquin P. Léna D. Lutz M. Nowak T. Ott T. Paumard K. Perraut G. Perrin O. Pfuhl S. Rabien G. Rodríguez-Coira J. Shangguan T. Shimizu S. Scheithauer J. Stadler O. Straub C. Straubmeier E. Sturm L.J. Tacconi F. Vincent S. von Fellenberg I. Waisberg F. Widmann E. Wieprecht E. Wiezorrek J. Woillez S. Yazici A. Young G. Zins{i}nst{9}
This is my paper · ORCID
classification astro-ph.GAastro-ph.IM
keywords aberrationsgravityaffectedastrometrycentereffectsgalacticlevel
verification ladder T0 review T1 audit T2 compute T3 formal
0 comments
abstract

The GRAVITY instrument on the ESO VLTI pioneers the field of high-precision near-infrared interferometry by providing astrometry at the $10 - 100\,\mu$as level. Measurements at such high precision crucially depend on the control of systematic effects. Here, 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 impact of such 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 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 of less 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 reported previously.

Discussion (0). Continue with ORCID to comment.

Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Ubiquitous Corotation of Dark Matter Halos: Implications for Direct Detection

    hep-ph 2026-07 conditional novelty 6.0 of 10

    Dark matter in simulated Milky Way analogues preferentially corotates with the baryonic disk, suppressing predicted direct-detection rates for light WIMPs, reducing directional modulation, and producing a 21% astrophy...

  2. Binary disruptions driven by massive disks around massive black holes

    astro-ph.GA 2026-07 conditional novelty 6.0 of 10

    Disk torques can drive stellar binaries around a massive black hole to tidal disruption, and the Milky Way's young stellar disk likely caused ~10^2 such events ~5 Myr ago.

  3. Unlocking Gravity and Gravitational Waves with Radio Pulsars: Advances and Challenges

    astro-ph.HE 2025-07 conditional novelty 4.0 of 10

    This review summarizes pulsar-based gravity tests and updates simulations predicting that the Double Pulsar will yield a neutron star moment of inertia measurement to about 5% by 2038.

  4. Probing Neutron Star Interiors and the Properties of Cold Ultra-dense Matter with the SKAO

    astro-ph.HE 2026-07 accept novelty 3.5 of 10

    SKAO's sensitivity, surveys and sub-arraying will deliver tighter NS mass, MoI, spin, glitch and precession constraints that, with X-ray and GW data, probe cold ultra-dense matter.

Pith tools