منابع مشابه
ORBITAL ORIENTATIONS OF EXOPLANETS: HAT-P-4b IS PROGRADE AND HAT-P-14b IS RETROGRADE
We present observations of the Rossiter-McLaughlin effect for two exoplanetary systems, revealing the orientations of their orbits relative to the rotation axes of their parent stars. HAT-P-4b is prograde, with a sky-projected spin-orbit angle of λ = −4.9 ± 11.9 degrees. In contrast, HAT-P-14b is retrograde, with λ = 189.1± 5.1 degrees. These results conform with a previously noted pattern amon...
متن کاملAn improved orbital ephemeris for Cygnus X - 1
By accumulating all available radial velocity data and combining it with our own spectroscopy we present a new and improved ephemeris for Cygnus X-1 (V1357 Cygni/HDE226868). We initially calculate an orbital period of 5.599847 ± 0.000018 days and then, by including the more recent radial velocities of LaSala et al. (1998) and Sowers et al. (1998) we refine this to 5.599829 ± 0.000016 days. Usin...
متن کاملSpinors as a tool to compute orbital ephemeris
In this paper, the Spinors of the physical 3-D Euclidean spaces of Geometric Algebras over a finite dimensional vector space are defined. Action of Spinors on Euclidean spaces is discussed. The technique for the calculation of ephemeris using Spinors is illustrated. In this process sequences of Spinors in their half angle form as well as their matrix form are used and compared. It is shown that...
متن کاملHAT-P-44b, HAT-P-45b, AND HAT-P-46b: THREE TRANSITING HOT JUPITERS IN POSSIBLE MULTI- PLANET SYSTEMS
We report the discovery by the HATNet survey of three new transiting extrasolar planets orbiting moderately bright (V=13.2, 12.8 and 11.9) stars. The planets have orbital periods of 4.3012, 3.1290, and 4.4631 days, masses of 0.39, 0.89, and 0.49MJ, and radii of 1.28, 1.43, and 1.28RJ. The stellar hosts have masses of 0.94, 1.26, and 1.28M⊙. Each system shows significant systematic variations in...
متن کاملWARM SPITZER PHOTOMETRY OF THREE HOT JUPITERS: HAT-P-3b, HAT-P-4b AND HAT-P-12b
We present Warm Spitzer/IRAC secondary eclipse time series photometry of three short-period transiting exoplanets, HAT-P-3b, HAT-P-4b and HAT-P-12b, in both the available 3.6 and 4.5μm bands. HAT-P-3b and HAT-P-4b are Jupiter-mass, objects orbiting an early K and an early G dwarf stars, respectively. For HAT-P-3b we find eclipse depths of 0.112% −0.030% (3.6μm) and 0.094% +0.016% −0.009% (4.5μm...
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ژورنال
عنوان ژورنال: New Astronomy
سال: 2012
ISSN: 1384-1076
DOI: 10.1016/j.newast.2011.10.003