Letteratura scientifica selezionata sul tema "Astrometry (Hipparcos. Gaia)"
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Articoli di riviste sul tema "Astrometry (Hipparcos. Gaia)":
Høg, Erik. "GIER: A Danish computer from 1961 with a role in the modern revolution of astronomy - II". Proceedings of the International Astronomical Union 12, S330 (aprile 2017): 92–93. http://dx.doi.org/10.1017/s1743921317005336.
Zacharias, Norbert, Valeri V. Makarov, Charles T. Finch, Hugh C. Harris, Jeffrey A. Munn e John P. Subasavage. "USNO Bright Star Catalog, Version 1". Astronomical Journal 164, n. 2 (5 luglio 2022): 36. http://dx.doi.org/10.3847/1538-3881/ac686d.
Brandt, G. Mirek, Daniel Michalik, Timothy D. Brandt, Yiting Li, Trent J. Dupuy e Yunlin Zeng. "htof: A New Open-source Tool for Analyzing Hipparcos, Gaia, and Future Astrometric Missions". Astronomical Journal 162, n. 6 (5 novembre 2021): 230. http://dx.doi.org/10.3847/1538-3881/ac12d0.
Chilcote, Jeffrey, Taylor Tobin, Thayne Currie, Timothy D. Brandt, Tyler D. Groff, Masayuki Kuzuhara, Olivier Guyon et al. "SCExAO/CHARIS Direct Imaging of A Low-mass Companion At A Saturn-like Separation from an Accelerating Young A7 Star". Astronomical Journal 162, n. 6 (19 novembre 2021): 251. http://dx.doi.org/10.3847/1538-3881/ac29ba.
Lindegren, L., e M. A. C. Perryman. "Microarcsec Astrometry: The Gaia Mission". Highlights of Astronomy 11, n. 1 (1998): 581–82. http://dx.doi.org/10.1017/s1539299600022401.
Sabu, Nidhi, Thomaskutty Francis, Arun Roy e Sreeja S. Kartha. "Gaia: Surveying Heavens". Mapana - Journal of Sciences 17, n. 1 (1 gennaio 2018): 11–23. http://dx.doi.org/10.12723/mjs.44.2.
Bernstein, H. H. "Derivation of orbital parameters of very low mass companions in double stars from radial velocities and observations of space astrometry missions like HIPPARCOS, DIVA and GAIA". International Astronomical Union Colloquium 170 (1999): 410–15. http://dx.doi.org/10.1017/s0252921100048843.
Scholz, R. D., S. Drew Chojnowski e S. Hubrig. "Strongly magnetic Ap stars in the Gaia DR2 Hertzsprung-Russell diagram". Astronomy & Astrophysics 628 (agosto 2019): A81. http://dx.doi.org/10.1051/0004-6361/201935752.
Röser, S., U. Bastian, K. S. de Boer, E. Høg, E. Schilbach, CH de Vegt e S. Wagner. "Diva - A Small Satellite for Global Astrometry and Photometry". Highlights of Astronomy 11, n. 1 (1998): 583. http://dx.doi.org/10.1017/s1539299600022413.
Lindegren, Lennart, e Dainis Dravins. "Astrometric radial velocities for nearby stars". Astronomy & Astrophysics 652 (agosto 2021): A45. http://dx.doi.org/10.1051/0004-6361/202141344.
Tesi sul tema "Astrometry (Hipparcos. Gaia)":
Pourbaix, Dimitri. "Space astrometry of unresolved binaries: from Hipparcos to Gaia". Doctoral thesis, Universite Libre de Bruxelles, 2007. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210649.
This manuscript illustrates how some chunks of the foreseen Gaia data reduction pipeline can be trained and assessed using the Hipparcos observations. This is especially true for unresolved binaries because they pop up so far down in the Gaia pipeline that, by the time they get there, there is essentially no difference between Hipparcos and Gaia data. Only the number of such binaries is different, going from two thousand to ten million.
Although the computing time clearly becomes an issue, one cannot sacrifice the robustness and correctness of the reduction pipeline for the sake of speed. However, owing to the requirement that everything must be Gaia-based (no help from ground-based results), the very robustness of the reduction has to be assessed as well. For instance, the underlying assumptions of some statistical tests used to assess the quality of the fits used in the Hipparcos pipeline might no longer hold with Gaia. That may not affect the fit itself but rather the quality indicators usually accompanying those fits. For the final catalogue to be a success, these issues must be addressed as soon as possible.
Agrégation de l'enseignement supérieur, Orientation sciences
info:eu-repo/semantics/nonPublished
Philipot, Florian. "Vers une recherche exhaustive des planètes géantes autour des étoiles proches de type solaire". Electronic Thesis or Diss., Université Paris sciences et lettres, 2023. http://www.theses.fr/2023UPSLO008.
The detection of the first exoplanets in the 1990s opened a new era in the study of planets. Today, thanks to increasingly powerful instruments, several hundred exoplanets (hot Jupiters, Super-Earths, multiple systems...) are discovered every year. Thanks to this wide variety of exoplanets, it is possible to study the distribution (distance, mass, eccentricity...) of these objects in order to better constrain the formation and evolution models of planetary system. Nevertheless, each detection method has its own limitations and detection biases. One aim of this thesis was to identify the limitations of the various detection methods, in particular those related to radial velocities (RV), and to improve the characterization of companions detected by RV.As a first step, I tested the robustness of studies aimed at determining the radial distribution of giant planets. Analysis of RV data from stars hosting long-period planets, the impact of stellar activity and the hypothesis made in completeness calculations, allowed us to demonstrate that statistical RV studies were not robust beyond 7-8 AU. Subsequently, I combined RV data with available absolute and relative astrometry measurements to improve the characterization of long-period sub-stellar companions. This study allowed us to precisely constrain the orbital parameters and, above all, the mass of seven companions detected in RV. It also highlighted the importance of coupling RV data with other measurements to accurately determine the nature of a companion. Finally, I used measurements of stars' proper motion anomalies (PMa), derived from Hipparcos and Gaia absolute astrometry, to search for new sub-stellar companions in the HARPS/VLT spectrograph archive. This analysis enabled me to improve the characterization of 14 sub-stellar companions, and to discover three new brown dwarfs and seven new exoplanets. I also demonstrated the effectiveness of using PMa measurements to optimize the search for sub-stellar companions
Capitoli di libri sul tema "Astrometry (Hipparcos. Gaia)":
Sozzetti, Alessandro, e Jos de Bruijne. "Space Astrometry Missions for Exoplanet Science: Gaia and the Legacy of Hipparcos". In Handbook of Exoplanets, 1–24. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-30648-3_81-1.
Sozzetti, Alessandro, e Jos de Bruijne. "Space Astrometry Missions for Exoplanet Science: Gaia and the Legacy of Hipparcos". In Handbook of Exoplanets, 1205–28. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-55333-7_81.
Turon, C. "FROM HIPPARCOS TO GAIA, AND BEYOND". In GAIA: At the Frontiers of Astrometry, 387–94. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0301-9-044.
Turon, C. "FROM HIPPARCOS TO GAIA, AND BEYOND". In GAIA: At the Frontiers of Astrometry, 387–94. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0301-9.c044.
Detournay, S., e D. Pourbaix. "FURTHER PROCESSING OF THE HIPPARCOS VARIABILITY INDUCED MOVERS". In GAIA: At the Frontiers of Astrometry, 367–70. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0301-9-039.
Detournay, S., e D. Pourbaix. "FURTHER PROCESSING OF THE HIPPARCOS VARIABILITY INDUCED MOVERS". In GAIA: At the Frontiers of Astrometry, 367–70. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0301-9.c039.
Perryman, M. A. C. "Hipparcos and Gaia: the development of space astrometry in Europe". In Payload and Mission Definition in Space Sciences, 219–32. Cambridge University Press, 2005. http://dx.doi.org/10.1017/cbo9780511550591.007.