Search
Now showing items 441-450 of 450
Evidence for nine planets in the HD 10180 system
(2012-07-01)
Aims. We re-analyse the HARPS radial velocities of HD 10180 and calculate the probabilities of models with differing numbers of periodic signals in the data. We test the significance of the seven signals, corresponding to ...
Volcanic ash over Scandinavia originating from the Grímsvötn eruptions in May 2011
(2012-05-16)
A volcanic ash plume that originated from the eruptions of Iceland's Grímsvötn volcano in May 2011 was observed over the Nordic countries using a combination of satellite observations and ground-based measurements. The ...
Astrometric and photometric initial mass functions from the UKIDSS Galactic Clusters Survey - I. The Pleiades
(2012-05-01)
We present the results of a deep wide-field near-infrared survey of the entire Pleiades cluster recently released as part of the UKIRT Infrared Deep Sky Survey (UKIDSS) Galactic Clusters Survey (GCS) Data Release 9 (DR9). ...
Ice formation in ash-influenced clouds after the eruption of the Eyjafjallajkull volcano in April 2010
(2011-10-27)
The influence of volcanic ash on heterogeneous ice nucleation in tropospheric clouds is investigated on the basis of 90 observed cloud cases. The clouds were observed with polarization lidars at the two central-European ...
Ash and fine-mode particle mass profiles from EARLINET-AERONET observations over central Europe after the eruptions of the Eyjafjallajökull volcano in 2010
(2011-01-01)
A combined lidar-photometer method that permits the retrieval of vertical profiles of ash and non-ash (fine-mode) particle mass concentrations is presented. By using a polarization lidar, the contributions of non-ash and ...
Bayesian analysis of the radial velocities of HD 11506 reveals another planetary companion
(2009-03-01)
Aims. We aim to demonstrate the efficiency of a Bayesian approach in analysing radial velocity data by reanalysing a set of radial velocity measurements. Methods. We present Bayesian analysis of a recently published set ...
The complementarity of astrometrie and radial velocity exoplanet observations: : Determining exoplanet mass with astrometric snapshots
(2009-02)
Aims. It is commonly assumed that the two indirect exoplanet detection methods, the radial velocity method and astrometric method, require observational periods exceeding the orbital period to produce positive results. ...
A wide deep infrared look at the Pleiades with UKIDSS : New constraints on the substellar binary fraction and the low-mass initial mass function
(2007-09-01)
We present the results of a deep wide-field near-infrared survey of 12 deg2 of the Pleiades conducted as part of the United Kingdom Infrared Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS) Galactic Cluster Survey (GCS). ...
Air mass modification over the Europe : EARLINET aerosol observations from Wales to Belarus
(2004-12-27)
For the first time, the vertically resolved aerosol optical properties of western and central/eastern European haze are investigated as a function of air mass transport. Special emphasis is put on clean maritime air masses ...
European pollution outbreaks during ACE 2 : Microphysical particle properties and single-scattering albedo inferred from multiwavelength lidar observations
(2002-08-06)
We present vertically resolved physical particle properties and the single-scattering albedo at 532 nm of pollution plumes advected from the European continent out over the Atlantic Ocean. The parameters follow from the ...