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Reducing ground-based astrometric errors with Gaia and Gaussian processes | | W. F. Fortino
; G. M. Bernstein
; P. H. Bernardinelli
; M. Aguena
; S. Allam
; J. Annis
; D. Bacon
; K. Bechtol
; S. Bhargava
; D. Brooks
; D. L. Burke
; J. Carretero
; A. Choi
; M. Costanzi
; L. N. da Costa
; M. E. S. Pereira
; J. De Vicente
; S. Desai
; P. Doel
; A. Drlica-Wagner
; K. Eckert
; T. F. Eifler
; A. E. Evrard
; I. Ferrero
; J. Frieman
; J. García-Bellido
; E. Gaztanaga
; D. W. Gerdes
; R. A. Gruendl
; J. Gschwend
; G. Gutierrez
; W. G. Hartley
; S. R. Hinton
; D. L. Hollowood
; K. Honscheid
; D. J. James
; M. Jarvis
; S. Kent
; K. Kuehn
; N. Kuropatkin
; M. A. G. Maia
; J. L. Marshall
; F. Menanteau
; R. Miquel
; R. Morgan
; J. Myles
; R. L. C. Ogando
; A. Palmese
; F. Paz-Chinchón
; A. A. Plazas
; A. Roodman
; E. S. Rykoff
; E. Sanchez
; B. Santiago
; V. Scarpine
; M. Schubnell
; S. Serrano
; I. Sevilla-Noarbe
; M. Smith
; E. Suchyta
; G. Tarle
; C. To
; D. L. Tucker
; T. N. Varga
; A. R. Walker
; J. Weller
; W. Wester
; | | Date: |
26 Oct 2020 | | Abstract: | Stochastic field distortions caused by atmospheric turbulence are a
fundamental limitation to the astrometric accuracy of ground-based imaging.
This distortion field is measurable at the locations of stars with accurate
positions provided by the Gaia DR2 catalog; we develop the use of Gaussian
process regression (GPR) to interpolate the distortion field to arbitrary
locations in each exposure. We introduce an extension to standard GPR
techniques that exploits the knowledge that the 2-dimensional distortion field
is curl-free. Applied to several hundred 90-second exposures from the Dark
Energy Survey as a testbed, we find that the GPR correction reduces the
variance of the turbulent distortions $approx12 imes$, on average, with
better performance in denser regions of the Gaia catalog. The RMS
per-coordinate distortion in the $riz$ bands is typically $approx7$ mas before
any correction, and $approx2$ mas after application of the GPR model. The GPR
astrometric corrections are validated by the observation that their use
reduces, from 10 to 5 mas RMS, the residuals to an orbit fit to $riz$-band
observations over 5 years of the $r=18.5$ trans-Neptunian object Eris. We also
propose a GPR method, not yet implemented, for simultaneously estimating the
turbulence fields and the 5-dimensional stellar solutions in a stack of
overlapping exposures, which should yield further turbulence reductions in
future deep surveys. | | Source: | arXiv, 2010.13742 | | Services: | Forum | Review | PDF | Favorites | |
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