Search Publications
Spitzer View of Young Massive Stars in the Large Magellanic Cloud H II Complexes. II. N 159
Meixner, Margaret; Chu, You-Hua; Sewilo, Marta +6 more
The H II complex N 159 in the Large Magellanic Cloud is used to study massive star formation in different environments, as it contains three giant molecular clouds (GMCs) that have similar sizes and masses but exhibit different intensities of star formation. We identify candidate massive young stellar objects (YSOs) using infrared photometry, and …
A study of interstellar gas and stars in the gravitationally lensed galaxy `the Cosmic Eye' from rest-frame ultraviolet spectroscopy
Pettini, Max; Shapley, Alice E.; Steidel, Charles C. +2 more
We report the results of a study of the rest-frame ultraviolet (UV) spectrum of the Cosmic Eye (J213512.73-010143), a luminous (L ~ 2L*) Lyman break galaxy at zsys = 3.07331 magnified by a factor of ~25 via gravitational lensing by foreground mass concentrations at z = 0.73 and 0.33. The spectrum, recorded at high resolution and signal-…
AKARI and BLAST Observations of the Cassiopeia A Supernova Remnant and Surrounding Interstellar Medium
Ade, P. A. R.; Bock, J. J.; Martin, P. G. +30 more
We use new large area far infrared maps ranging from 65 to 500 µm obtained with the AKARI and the Balloon-borne Large Aperture Submillimeter Telescope missions to characterize the dust emission toward the Cassiopeia A supernova remnant (SNR). Using the AKARI high-resolution data we find a new "tepid" dust grain population at a temperature of…
Unveiling the Three-dimensional Structure of Galaxy Clusters: Resolving the Discrepancy Between X-ray and Lensing Masses
Limousin, Marceau; Morandi, Andrea; Pedersen, Kristian
We present the first determination of the intrinsic three-dimensional (3D) shapes and the physical parameters of both dark matter (DM) and intracluster medium (ICM) in a triaxial galaxy cluster. While most previous studies rely on the standard spherical modeling, our approach allows us to infer the properties of the non-spherical intracluster gas …
Transiting exoplanets from the CoRoT space mission. X. CoRoT-10b: a giant planet in a 13.24 day eccentric orbit
Mazeh, T.; Aigrain, S.; Alonso, R. +47 more
Context. The space telescope CoRoT searches for transiting extrasolar planets by continuously monitoring the optical flux of thousands of stars in several fields of view.
Aims: We report the discovery of CoRoT-10b, a giant planet on a highly eccentric orbit (e = 0.53 ± 0.04) revolving in 13.24 days around a faint (V = 15.22) metal-rich K1V st…
Transiting exoplanets from the CoRoT space mission. XIV. CoRoT-11b: a transiting massive ``hot-Jupiter'' in a prograde orbit around a rapidly rotating F-type star
Mazeh, T.; Aigrain, S.; Alonso, R. +52 more
The CoRoT exoplanet science team announces the discovery of CoRoT-11b, a fairly massive hot-Jupiter transiting a V = 12.9 mag F6 dwarf star (M_* = 1.27±0.05 M⊙, R_* = 1.37±0.03 R⊙, Teff = 6440±120 K), with an orbital period of P = 2.994329±0.000011 days and semi-major axis a = 0.0436±0.005 AU. The detection of part…
A Detailed Spectropolarimetric Analysis of the Planet-hosting Star WASP-12
Fossati, L.; Hebb, L.; Kochukhov, O. +9 more
The knowledge of accurate stellar parameters is paramount in several fields of stellar astrophysics, particularly in the study of extrasolar planets, where often the star is the only visible component and therefore used to infer the planet's fundamental parameters. Another important aspect of the analysis of planetary systems is the stellar activi…
Active shoreline of Ontario Lacus, Titan: A morphological study of the lake and its surroundings
Stofan, E.; Le Gall, A.; Mitchell, K. +18 more
Of more than 400 filled lakes now identified on Titan, the first and largest reported in the southern latitudes is Ontario Lacus, which is dark in both infrared and microwave. Here we describe recent observations including synthetic aperture radar (SAR) images by Cassini's radar instrument (λ = 2 cm) and show morphological evidence for active mate…
Metal transport by gas sloshing in M87
Böhringer, H.; Simionescu, A.; Churazov, E. +5 more
We present the results of an XMM-Newton mosaic covering the central ~200kpc of the nearby Virgo cluster. We focus on a strong surface brightness discontinuity in the outskirts of the brightest cluster galaxy (BCG), M87. Using both XMM-Newton and Suzaku, we derive accurate temperature and metallicity profiles across this feature and show that it is…
High-resolution imaging of Galactic massive stars with AstraLux. I. 138 fields with δ > - 25°
Maíz Apellániz, J.
Context. Massive stars have high-multiplicity fractions, and many of them have still undetected components, thus hampering the study of their properties.
Aims: I study a sample of massive stars with high angular resolution to better characterize their multiplicity.
Methods: I observed 138 fields that include at least one massive star wit…