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Astronomers discover a rare “black widow” binary, with the shortest orbit yet（图）
“黑寡妇”双星 恒星 伴星环 银河系
2023/6/9
The flashing of a nearby star has drawn MIT astronomers to a new and mysterious system 3,000 light years from Earth. The stellar oddity appears to be a new “black widow binary” — a rapidly spinning ne...
Nonlinear Dynamical Friction of a Circular-Orbit Perturber in a Gaseous Medium
Galaxy Astrophysics (astro-ph.GA)
2010/12/28
We use three-dimensional hydrodynamic simulations to investigate the nonlinear gravitational responses of gas to, and the resulting drag forces on, very massive perturbers moving on circular orbits.
The Japanese Space Agency, JAXA, has launched an investigation into a failed attempt to put a craft into orbit around Venus. Akatsuki, which blasted off in May, was due to study Venus's violent atmosp...
Collision of an innermost stable circular orbit particle around a Kerr black hole
innermost stable circular orbit particle Kerr black hole
2011/1/13
We derive a general formula for the center-of-mass (CM) energy for the near-horizon collision of two particles of the same rest mass on the equatorial plane around a Kerr black hole. We then apply thi...
Spectra disentangling applied to the Hyades binary Theta^2 Tau AB: new orbit, orbital parallax and component properties
the Hyades binary Theta^2 Tau AB orbital parallax component properties
2011/1/11
Theta^2 Tauri is a detached and single-lined interferometric-spectroscopic binary as well as the most massive binary system of the Hyades cluster. The system revolves in an eccentric orbit with a peri...
The spin and orbit of the newly discovered pulsar IGR J17480-2446
the newly discovered pulsar IGR J17480-2446
2011/1/10
We present an analysis of the spin and orbital properties of the newly discovered accreting pulsar IGR J17480-2446, located in the globular cluster Terzan 5. Considering the pulses detected by the Ros...
The Banana Project. III. Spin-orbit Alignment in the Long-period Eclipsing Binary NY Cephei
techniques spectroscopic|stars kinematics and dynamics|stars early-type stars rotation|stars formation
2010/11/9
Binaries are not always neatly aligned. Previous observations of the DI Her system showed that the spin axes of both stars are highly inclined with respect to one another and the orbital axis. Here we...
A campaign of 35 epochs of milli-arcsecond resolution VLBAobservations of the archetype collidingwind WR+O star binary system WR140 show the wind-collision region (WCR) as a bow-shaped arc of emission...
The barycentric motion of exoplanet host stars: tests of solar spin-orbit coupling
Earth and Planetary Astrophysics (astro-ph.EP)
2010/12/24
Empirical evidence suggests a tantalising but unproven link between various indicators of solar activity and the barycentric motion of the Sun. The latter is exemplified by transitions between regular...
WASP-38b: A Transiting Exoplanet in an Eccentric, 6.87d Period Orbit
Earth and Planetary Astrophysics (astro-ph.EP)
2010/12/24
We report the discovery of WASP-38b, a long period transiting planet in an eccentric 6.871815 day orbit. The transit epoch is 2455335.92050 +/- 0.00074 (HJD) and the transit duration is 4.663 hours. W...
Orbit, masses and spectral analysis of the visual binary a 2329
Orbit masses visual binary a 2329
2009/7/9
Orbit, masses and spectral analysis of the visual binary a 2329。
The spectroscopic orbit of cygni, a system with two Late-type giants
spectroscopic orbit cygni two Late-type giants
2009/6/16
The spectroscopic orbit of cygni, a system with two Late-type giants。
Energy Dependence of Near-relativistic Electron Spectrum at Geostationary Orbit during the SEP Events of 2005
SEP events shocks geostationary orbit REDs REEs
2009/5/6
In view of the renewed interest in the study of energetic particles
in the outer radiation belt of the earth, we feel it will be helpful in
looking for the energy dependence of the electron energy s...
ORBIT OF BINARY STAR ADS 16904, A 643。
VISUAL BINARY ORBIT DETERMINATION. ONE POSSIBLE APPROACH
BINARY ORBIT ONE POSSIBLE APPROACH
2009/4/8
VISUAL BINARY ORBIT DETERMINATION. ONE POSSIBLE APPROACH。