Search Publications
A solar-like magnetic cycle on the mature K-dwarf 61 Cygni A (HD 201091)
Reiners, A.; Donati, J. -F.; Petit, P. +9 more
Context. The long-term monitoring of magnetic cycles in cool stars is a key diagnostic in understanding how dynamo generation and amplification of magnetic fields occur in stars similar in structure to the Sun.
Aims: We investigated the temporal evolution of a possible magnetic cycle of 61 Cyg A. The magnetic cycle is determined from 61 Cyg A…
Azimuthal asymmetries in the debris disk around HD 61005. A massive collision of planetesimals?
Rouan, D.; Pinte, C.; Quanz, S. P. +30 more
Context. Debris disks offer valuable insights into the latest stages of circumstellar disk evolution, and can possibly help us to trace the outcomes of planetary formation processes. In the age range 10 to 100 Myr, most of the gas is expected to have been removed from the system, giant planets (if any) must have already been formed, and the format…
A narrow, edge-on disk resolved around HD 106906 with SPHERE
Henning, T.; Brandner, W.; Milli, J. +39 more
Context. HD 106906AB is the only young binary system so far around which a planet has been imaged and a debris disk has been shown to exist, thanks to a strong IR excess. As such, it represents a unique opportunity for studying the dynamics of young planetary systems.
Aims: We aim at further investigating the close (tens of au scales) environ…
The far-infrared emitting region in local galaxies and QSOs: Size and scaling relations
Berta, S.; Lutz, D.; Förster Schreiber, N. M. +9 more
We use Herschel 70 to 160 µm images to study the size of the far-infrared emitting region in about 400 local galaxies and quasar (QSO) hosts. The sample includes normal "main-sequence" star-forming galaxies, as well as infrared luminous galaxies and Palomar-Green QSOs, with different levels and structures of star formation. Assuming Gaussian…
The XXL Survey . IV. Mass-temperature relation of the bright cluster sample
Smith, G. P.; Chiappetti, L.; Pierre, M. +18 more
Context. The XXL Survey is the largest survey carried out by XMM-Newton. Covering an area of 50 deg2, the survey contains ~450 galaxy clusters out to a redshift ~2 and to an X-ray flux limit of ~ 5 × 10-15 erg s-1 cm-2. This paper is part of the first release of XXL results focussed on the bright cluster…
Dust properties of Lyman-break galaxies at z ~ 3
Pérez-Fournon, I.; Rodighiero, G.; Ilbert, O. +18 more
Context. Since the mid-1990s, the sample of Lyman-break galaxies (LBGs) has been growing thanks to the increasing sensitivities in the optical and in near-infrared telescopes for objects at z> 2.5. However, the dust properties of the LBGs are poorly known because the samples are small and/or biased against far-infrared (far-IR) or submillimeter…
Systematic comparison of photoionised plasma codes with application to spectroscopic studies of AGN in X-rays
Kaastra, J. S.; Mehdipour, M.; Kallman, T.
Atomic data and plasma models play a crucial role in the diagnosis and interpretation of astrophysical spectra, thus influencing our understanding of the Universe. In this investigation we present a systematic comparison of the leading photoionisation codes to determine how much their intrinsic differences impact X-ray spectroscopic studies of hot…
Stellar parametrization from Gaia RVS spectra
Allende Prieto, C.; Recio-Blanco, A.; de Laverny, P. +7 more
Context. Among the myriad of data collected by the ESA Gaia satellite, about 150 million spectra will be delivered by the Radial Velocity Spectrometer (RVS) for stars as faint as GRVS~ 16. A specific stellar parametrization will be performed on most of these RVS spectra, I.e. those with enough high signal-to-noise ratio (S/N), which sho…
Planck 2015 results. VI. LFI mapmaking
Bernard, J. -P.; Planck Collaboration; Ade, P. A. R. +198 more
This paper describes the mapmaking procedure applied to Planck Low Frequency Instrument (LFI) data. The mapmaking step takes as input the calibrated timelines and pointing information. The main products are sky maps of I, Q, and U Stokes components. For the first time, we present polarization maps at LFI frequencies. The mapmaking algorithm is bas…
Convolution kernels for multi-wavelength imaging
Abergel, A.; Dole, H.; Bocchio, M. +3 more
Astrophysical images issued from different instruments and/or spectral bands often require to be processed together, either for fitting or comparison purposes. However each image is affected by an instrumental response, also known as point-spread function (PSF), that depends on the characteristics of the instrument as well as the wavelength and th…