Search Publications
The simultaneous low state spectral energy distribution of 1ES 2344+514 from radio to very high energies
Maraschi, L.; Covino, S.; Antonelli, L. A. +193 more
Context. BL Lacertae objects are variable at all energy bands on time scales down to minutes. To construct and interpret their spectral energy distribution (SED), simultaneous broad-band observations are mandatory. Up to now, the number of objects studied during such campaigns is very limited and biased towards high flux states.
Aims: We pres…
Heavy water stratification in a low-mass protostar
Ceccarelli, C.; Caux, E.; Vastel, C. +6 more
Context. Despite the low elemental deuterium abundance in the Galaxy, enhanced molecular deuterium fractionation has been found in the environments of low-mass star-forming regions and, in particular, the Class 0 protostar IRAS 16293-2422.
Aims: The key program Chemical HErschel Surveys of Star forming regions (CHESS) aims at studying the mol…
Vertical flows and mass flux balance of sunspot umbral dots
Solanki, S. K.; van Noort, M.; Riethmüller, T. L. +1 more
A new Stokes inversion technique that greatly reduces the effect of the spatial point spread function of the telescope is used to constrain the physical properties of umbral dots (UDs). The depth-dependent inversion of the Stokes parameters from a sunspot umbra recorded with Hinode SOT/SP revealed significant temperature enhancements and magnetic …
A Herschel PACS survey of the dust and gas in Upper Scorpius disks
Duchêne, Gaspard; Ménard, François; Pinte, Christophe +2 more
We present results of far-infrared photometric observations with Herschel PACS of a sample of Upper Scorpius stars, with a detection rate of previously known disk-bearing K and M stars at 70, 100, and 160 µm of 71%, 56%, and 50%, respectively. We fit power-law disk models to the spectral energy distributions of K & M stars with infrared …
On the shape of the mass-function of dense clumps in the Hi-GAL fields . I. Spectral energy distribution determination and global properties of the mass-functions
Smith, M. D.; Montier, L.; Ristorcelli, I. +11 more
Context. Stars form in dense, dusty clumps of molecular clouds, but little is known about their origin and evolution. In particular, the relationship between the mass distribution of these clumps (also known as the clump mass function or CMF) and the stellar initial mass function (IMF), is still poorly understood.
Aims: To discern the "true" …
The northwestern ejecta knot in SN 1006
Miceli, M.; Bocchino, F.; Decourchelle, A. +3 more
Aims: We want to probe the physics of fast collision-less shocks in supernova remnants. We are interested in the non-equilibration of temperatures and particle acceleration. Specifically, we aim to measure the oxygen temperature with regards to the electron temperature. In addition, we search for synchrotron emission in the northwestern therm…
A coordinated optical and X-ray spectroscopic campaign on HD 179949: searching for planet-induced chromospheric and coronal activity
Moutou, C.; Donati, J. -F.; Scandariato, G. +10 more
Context.
Correlation of spectral solar irradiance with solar activity as measured by VIRGO
Schmutz, W.; Shapiro, A. I.; Wehrli, C.
Context. The variability of solar spectral irradiance (SSI) over the rotational period and its trend over the solar activity cycle are important for understanding the Sun-Earth connection as well as for observational constraints for solar models. Recently the Spectral Irradiance Monitor (SIM) experiment on the Solar Radiation and Climate Experimen…
Gas and dust cooling along the major axis of M 33 (HerM33es). ISO/LWS [C ii] observations
Boquien, M.; Braine, J.; van der Werf, P. +12 more
Aims: We aim to better understand the heating of gas by observing the prominent gas cooling line [C ii] at 158 µm in the low-metallicity environment of the Local Group spiral galaxy M 33 on scales of 280 pc. In particular, we describe the variation of the photoelectric heating efficiency with the galactic environment.
Methods: In t…
The HARPS search for southern extra-solar planets . XXXII. New multi-planet systems in the HARPS volume limited sample: a super-Earth and a Neptune in the habitable zone
Bouchy, F.; Moutou, C.; Queloz, D. +10 more
The vast diversity of planetary systems detected to date is defying our capability of understanding their formation and evolution. Well-defined volume-limited surveys are the best tool at our disposal to tackle the problem, via the acquisition of robust statistics of the orbital elements. We are using the HARPS spectrograph to conduct our survey o…