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Spectrally resolved helium absorption from the extended atmosphere of a warm Neptune-mass exoplanet
R. Allart, V. Bourrier, C. Lovis +7
Stellar heating causes atmospheres of close-in exoplanets to expand and escape. These extended atmospheres are difficult to observe because their main spectral signature - neutral…
WASP-166b: a bloated super-Neptune transiting a V = 9 star
Coel Hellier, D. R. Anderson, A. H. M. J. Triaud +21
We report the discovery of WASP-166b, a super-Neptune planet with a mass of 0.1 Mjup (1.9 Mnep) and a bloated radius of 0.63 Rjup. It transits a V = 9.36, F9V star in a 5.44-d orbi…
Atomic iron and titanium in the atmosphere of the exoplanet KELT-9b
H. Jens Hoeijmakers, David Ehrenreich, Kevin Heng +10
The chemical composition of an exoplanet is a key ingredient in constraining its formation history. Iron is the most abundant transition metal, but has never been directly detected…
Helium in the eroding atmosphere of an exoplanet
J. J. Spake, D. K. Sing, T. M. Evans +20
Helium is the second-most abundant element in the Universe after hydrogen and is one of the main constituents of gas-giant planets in our Solar System. Early theoretical models pre…
The HARPS search for southern extra-solar planets. XLIII. A compact system of four super-Earth planets orbiting HD 215152
J. -B. Delisle, D. Ségransan, X. Dumusque +22
We report the discovery of four super-Earth planets around HD 215152, with orbital periods of 5.76, 7.28, 10.86, and 25.2 d, and minimum masses of 1.8, 1.7, 2.8, and 2.9 M_Earth re…