Sökning: WFRF:(Fabricius P. E) >
Gaia Data Release 3...
Gaia Data Release 3 : Gaia scan-angle-dependent signals and spurious periods
-
- Holl, B. (författare)
- University of Geneva
-
- Fabricius, C. (författare)
- University of Barcelona,CSIC Institut de Ciènces de l’Espai (IEEC)
-
- Portell, J. (författare)
- CSIC Institut de Ciènces de l’Espai (IEEC),University of Barcelona
-
visa fler...
-
- Lindegren, L. (författare)
- Lund University,Lunds universitet,Astrofysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Astrophysics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
-
- Panuzzo, P. (författare)
- Paris Observatory
-
- Bernet, M. (författare)
- CSIC Institut de Ciènces de l’Espai (IEEC),University of Barcelona
-
- Castañeda, J. (författare)
- CSIC Institut de Ciènces de l’Espai (IEEC),University of Barcelona
-
- Jevardat De Fombelle, G. (författare)
- University of Geneva
-
- Audard, M. (författare)
- University of Geneva
-
- Ducourant, C. (författare)
- Bordeaux Observatory
-
- Harrison, D. L. (författare)
- University of Cambridge
-
- Evans, D. W. (författare)
- University of Cambridge
-
- Busso, G. (författare)
- University of Cambridge
-
- Sozzetti, A. (författare)
- INAF-Osservatorio Astronomico di Roma
-
- Gosset, E. (författare)
- Belgian National Fund For Scientific Research (FNRS),University of Liège
-
- Arenou, F. (författare)
- Paris Observatory
-
- De Angeli, F. (författare)
- University of Cambridge
-
- Riello, M. (författare)
- University of Cambridge
-
- Eyer, L. (författare)
- University of Geneva
-
- Rimoldini, L. (författare)
- University of Geneva
-
- Gavras, P. (författare)
- European Space Agency (ESA)
-
- Mowlavi, N. (författare)
- University of Geneva
-
- Nienartowicz, K. (författare)
- University of Geneva
-
- Lecoeur-Taïbi, I. (författare)
- University of Geneva
-
- García-Lario, P. (författare)
- European Space Astronomy Centre
-
- Pourbaix, D. (författare)
- Belgian National Fund For Scientific Research (FNRS),Université Libre de Bruxelles (ULB)
-
visa färre...
-
(creator_code:org_t)
- 2023-03-23
- 2023
- Engelska.
-
Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 674
- Relaterad länk:
-
http://dx.doi.org/10... (free)
-
visa fler...
-
https://lup.lub.lu.s...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- Context. Gaia Data Release 3 (Gaia DR3) time series data may contain spurious signals related to the time-dependent scan angle. Aims. We aim to explain the origin of scan-angle-dependent signals and how they can lead to spurious periods, provide statistics to identify them in the data, and suggest how to deal with them in Gaia DR3 data and in future releases. Methods. Using real Gaia (DR3) data alongside numerical and analytical models, we visualise and explain the features observed in the data. Results. We demonstrated with Gaia (DR3) data that source structure (multiplicity or extendedness) or pollution from close-by bright objects can cause biases in the image parameter determination from which photometric, astrometric, and (indirectly) radial velocity time series are derived. These biases are a function of the time-dependent scan direction of the instrument and thus can introduce scan-angle-dependent signals, which due to the scanning-law-induced sampling of Gaia can result in specific spurious periodic signals. Numerical simulations in which a period search is performed on Gaia time series with a scan-angle-dependent signal qualitatively reproduce the general structure observed in the spurious period distribution of photometry and astrometry, and the associated spatial distributions on the sky. A variety of statistics allows for the deeper understanding and identification of affected sources. Conclusions. The origin of the scan-angle-dependent signals and subsequent spurious periods is well understood and is mostly caused by fixed-orientation optical pairs with a separation < 0.5'' (including binaries with P ≈ 5 y) and (cores of) distant galaxies. Although most of the sources with affected derived parameters have been filtered out from the Gaia archive nss-two-body-orbit and several vari-tables, Gaia DR3 data remain that should be treated with care (no sources were filtered from gaia-source). Finally, the various statistics discussed in the paper can be used to identify and filter affected sources and also reveal new information about them that is not available through other means, especially in terms of binarity on sub-arcsecond scale.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Astrometry
- Methods: data analysis
- Methods: numerical
- Techniques: photometric
- Techniques: radial velocities
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
Hitta via bibliotek
Till lärosätets databas
- Av författaren/redakt...
-
Holl, B.
-
Fabricius, C.
-
Portell, J.
-
Lindegren, L.
-
Panuzzo, P.
-
Bernet, M.
-
visa fler...
-
Castañeda, J.
-
Jevardat De Fomb ...
-
Audard, M.
-
Ducourant, C.
-
Harrison, D. L.
-
Evans, D. W.
-
Busso, G.
-
Sozzetti, A.
-
Gosset, E.
-
Arenou, F.
-
De Angeli, F.
-
Riello, M.
-
Eyer, L.
-
Rimoldini, L.
-
Gavras, P.
-
Mowlavi, N.
-
Nienartowicz, K.
-
Lecoeur-Taïbi, I ...
-
García-Lario, P.
-
Pourbaix, D.
-
visa färre...
- Om ämnet
-
- NATURVETENSKAP
-
NATURVETENSKAP
-
och Fysik
-
och Astronomi astrof ...
- Artiklar i publikationen
-
Astronomy and As ...
- Av lärosätet
-
Lunds universitet