The HARPS search for southern extra-solar planets - XXXI. The M-dwarf sample
- X. Bonfils, X. Delfosse, J. Bertaux
- Physics, Geology
- 21 November 2011
Searching for planets around stars with different masses helps us to assess the outcome of planetary formation for different initial conditions. The low-mass M dwarfs are also the most frequent stars…
The HARPS search for southern extra-solar planets: XVIII. An Earth-mass planet in the GJ 581 planetary system
- M. Mayor, X. Bonfils, N. Santos
- Physics, Geology
- 15 June 2009
The GJ 581 planetary system was already known to harbour three planets, including two presumably rocky planets which straddle its habitable zone. We report here the detection of an additional planet…
An extrasolar planetary system with three Neptune-mass planets
Simulations show that the system of three Neptune-mass planets orbiting the nearby star HD 69830 is in a dynamically stable configuration and theoretical calculations favour a mainly rocky composition for both inner planets, while the outer planet probably has a significant gaseous envelope surrounding its rocky/icy core.
Deflection of the Interstellar Neutral Hydrogen Flow Across the Heliospheric Interface
- R. Lallement, E. Quémerais, J. Bertaux, S. Ferron, D. Koutroumpa, R. Pellinen
- PhysicsScience
- 4 March 2005
The neutral hydrogen flow is found to be deflected relative to the helium flow by about 4°, the most likely explanation of this deflection is a distortion of the heliosphere under the action of an ambient interstellar magnetic field.
On the nucleus structure and activity of comet 67P/Churyumov-Gerasimenko
- H. Sierks, C. Barbieri, M. Pätzold
- Physics, GeologyScience
- 23 January 2015
Images from the OSIRIS scientific imaging system onboard Rosetta show that the nucleus of 67P/Churyumov-Gerasimenko consists of two lobes connected by a short neck, which raises the question of whether the two Lobes represent a contact binary formed 4.5 billion years ago, or a single body where a gap has evolved via mass loss.
Dust measurements in the coma of comet 67P/Churyumov-Gerasimenko inbound to the Sun
- A. Rotundi, H. Sierks, J. Zarnecki
- Physics, GeologyScience
- 23 January 2015
The largest orbiting clumps are meter-sized, confirming the dust/gas ratio of 3 inferred at perihelion from models of dust comae and trails.
Density and temperatures of the upper Martian atmosphere measured by stellar occultations with Mars Express SPICAM
- F. Forget, F. Montmessin, M. Lopez‐Valverde
- Physics, Environmental Science
- 2009
[1] We present one Martian year of observations of the density and temperature in the upper atmosphere of Mars (between 60 and 130 km) obtained by the Mars Express ultraviolet spectrometer…
The HARPS search for southern extra-solar planets - XIX. Characterization and dynamics of the GJ 876 planetary system
- A. Correia, J. Couetdic, S. Udry
- Physics, Geology
- 26 January 2010
Precise radial-velocity measurements for data acquired with the HARPS spectrograph infer that three planets orbit the M4 dwarf star GJ876. In particular, we confirm the existence of planet d, which…
The HARPS survey for southern extra-solar planets. II. A 14 Earth-masses exoplanet around μ Arae
- N. Santos, F. Bouchy, S. Vauclair
- Physics, Geology
- 25 August 2004
In this letter we present the discovery of a very light planetary companion to the star mu Ara (HD160691). The planet orbits its host once every 9.5days, and induces a sinusoidal radial velocity…
...
...