The μ Arae Planetary System: Radial Velocities and Astrometry
Article
Article Title | The μ Arae Planetary System: Radial Velocities and Astrometry |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Benedict, G. F. (Author), McArthur, B. E. (Author), Nelan, E. P. (Author), Wittenmyer, R. (Author), Barnes, R. (Author), Smotherman, H. (Author) and Horner, J. (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 163 (6), pp. 1-16 |
Article Number | 295 |
Number of Pages | 16 |
Year | 2022 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ac6ac8 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ac6ac8 |
Abstract | With Hubble Space Telescope Fine Guidance Sensor astrometry and published and previously unpublished radial velocity measures, we explore the exoplanetary system μ Arae. Our modeling of the radial velocities results in improved orbital elements for the four previously known components. Our astrometry contains no evidence for any known companion but provides upper limits for three companion masses. A final summary of all past Fine Guidance Sensor exoplanet astrometry results uncovers a bias toward small inclinations (more face-on than edge-on). This bias remains unexplained by small number statistics, modeling technique, Fine Guidance Sensor mechanical issues, or orbit modeling of noise-dominated data. A numerical analysis using our refined orbital elements suggests that planet d renders the μ Arae system dynamically unstable on a timescale of 105 yr, in broad agreement with previous work. |
Keywords | Exoplanets; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
510102. Astronomical instrumentation | |
Byline Affiliations | University of Texas at Austin, United States |
University of Texas, United States | |
Space Telescope Science Institute, United States | |
Centre for Astrophysics | |
University of Washington, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q77vq/the-arae-planetary-system-radial-velocities-and-astrometry
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