منابع مشابه
Screening the Hipparcos-based astrometric orbits of sub-stellar objects
The combination of Hipparcos astrometric data with the spectroscopic data of putative extrasolar planets seems to indicate that a significant fraction of these low-mass companions could be brown or M dwarfs (Han et al. 2001). We show that this is due to the adopted reduction procedure, and consequently that the Hipparcos data do not reject the planetary mass hypothesis in all but one cases. Add...
متن کاملUnconstrained Astrometric Orbits for Hipparcos Stars with Stochastic Solutions
A considerable number of astrometric binaries whose positions on the sky do not obey the standard model of mean position, parallax, and linear proper motion were observed by the Hipparcos satellite. Some of them remain undiscovered, and their observational data have not been properly processed with the more adequate astrometric model that includes nonlinear orbital motion. We develop an automat...
متن کاملAstrometric Monitoring of Stellar Orbits at the Galactic Center with a Next Generation Large Telescope
We show that with a Next Generation Large Telescope one can detect the accelerated motions of ∼ 100 stars orbiting the massive black hole at the Galactic center. The positions and velocities of these stars will be measured to astrometric and spectroscopic precision several times better than currently attainable enabling detailed measurements of the gravitational potential in the neighborhood of...
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The astrometric and radial velocity techniques of extra-solar planet detection attempt to detect the periodic reflex motion of the parent star by extracting this periodic signal from a time-sampled set of observations. The extraction is generally accomplished using periodogram analysis or the functionally equivalent technique of Least Squares fitting of sinusoids. In this paper, we use a Freque...
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Guillaume Lettre1,2, Anne U Jackson3,25, Christian Gieger4,5,25, Fredrick R Schumacher6,7,25, Sonja I Berndt8,25, Serena Sanna3,9,25, Susana Eyheramendy4,5, Benjamin F Voight1,10, Johannah L Butler2, Candace Guiducci1, Thomas Illig4, Rachel Hackett1, Iris M Heid4,5, Kevin B Jacobs11, Valeriya Lyssenko12, Manuela Uda9, The Diabetes Genetics Initiative24, FUSION24, KORA24, The Prostate, Lung Colo...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 1951
ISSN: 0004-6256
DOI: 10.1086/106580