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The orbital motion, absolute mass and high-altitude winds of exoplanet HD 209458b
High-dispersion ground-based spectroscopy of a transit of the extrasolar planet HD 209458b sees a significant wavelength shift in absorption lines from carbon monoxide in the planet’s atmosphere, which is concluded arises from a change in the radial component of the planet's orbital velocity.
An asteroseismic view of the radius valley: stripped cores, not born rocky
- V. V. Eylen, Camilla Agentoft, I. Snellen
- Geology, PhysicsMonthly Notices of the Royal Astronomical Society
- 15 October 2017
Various theoretical models treating the effect of stellar irradiation on planetary envelopes predict the presence of a radius valley, i.e. a bimodal distribution of planet radii, with super-Earths…
The PLATO 2.0 mission
PLATO 2.0 has recently been selected for ESA’s M3 launch opportunity (2022/24). Providing accurate key planet parameters (radius, mass, density and age) in statistical numbers, it addresses…
The signature of orbital motion from the dayside of the planet τ Boötis b
The detection of carbon monoxide absorption in the thermal dayside spectrum of τ Boötis b supports the hypothesis that the absorbing compounds believed to cause such atmospheric inversions are destroyed in τ Bo Ötis b by the ultraviolet emission from the active host star.
Ground-based detection of sodium in the transmission spectrum of exoplanet HD209458b
Context. The first detection of an atmosphere around an extrasolar planet was presented by Charbonneau and collaborators in 2002. In the optical transmission spectrum of the transiting exoplanet HD…
The fast spin-rotation of a young extrasolar planet
The spin-rotation of a planet arises from the accretion of angular momentum during its formation, but the details of this process are still unclear. In the solar system, the equatorial rotation…
Optical to near-infrared transit observations of super-Earth GJ 1214b: water-world or mini-Neptune?
Context. GJ1214b, the 6.55 Earth-mass transiting planet recently discovered by the MEarth team, has a mean density of∼35% of that of the Earth. It is thought that this planet is either a mini-N…
Misaligned spin and orbital axes cause the anomalous precession of DI Herculis
It is reported that both stars of DI Herculis rotate with their spin axes nearly perpendicular to the orbital axis, which causes precession in the direction opposite to that of relativistic precession, thereby reconciling the theoretical and observed rates.
Combining high-dispersion spectroscopy with high contrast imaging : Probing rocky planets around our nearest neighbors
Context. Ground-based high-dispersion (R 100,000) spectroscopy (HDS) is proving to be a powerful technique with which to characterize extrasolar planets. The planet signal is distilled from the…
The changing phases of extrasolar planet CoRoT-1b
Optical photometric data obtained over 36 planetary orbits of the transiting hot Jupiter CoRoT-1b are consistent with the nightside hemisphere of the planet being entirely black, with the dayside flux dominating the optical phase curve.