Search Publications
Polarimetric imaging mode of VLT/SPHERE/IRDIS. II. Characterization and correction of instrumental polarization effects
Ménard, F.; Henning, T.; Fantinel, D. +31 more
Context. Circumstellar disks and self-luminous giant exoplanets or companion brown dwarfs can be characterized through direct-imaging polarimetry at near-infrared wavelengths. SPHERE/IRDIS at the Very Large Telescope has the capabilities to perform such measurements, but uncalibrated instrumental polarization effects limit the attainable polarimet…
The Solar Orbiter Radio and Plasma Waves (RPW) instrument
Hellinger, P.; André, M.; Maksimovic, M. +103 more
The Radio and Plasma Waves (RPW) instrument on the ESA Solar Orbiter mission is described in this paper. This instrument is designed to measure in-situ magnetic and electric fields and waves from the continuous to a few hundreds of kHz. RPW will also observe solar radio emissions up to 16 MHz. The RPW instrument is of primary importance to the Sol…
The Solar Orbiter SPICE instrument. An extreme UV imaging spectrometer
Vial, J. -C.; Williams, D.; Peter, H. +87 more
Aims: The Spectral Imaging of the Coronal Environment (SPICE) instrument is a high-resolution imaging spectrometer operating at extreme ultraviolet wavelengths. In this paper, we present the concept, design, and pre-launch performance of this facility instrument on the ESA/NASA Solar Orbiter mission.
Methods: The goal of this paper is to…
High-precision abundances of elements in solar-type stars. Evidence of two distinct sequences in abundance-age relations
Christensen-Dalsgaard, J.; Spitoni, E.; Nissen, P. E. +3 more
Aims: Previous high-precision studies of abundances of elements in solar twin stars are extended to a wider metallicity range to see how the trends of element ratios with stellar age depend on [Fe/H].
Methods: HARPS spectra with signal-to-noise ratios S/N ≳ 600 at λ ∼ 6000 Å were analysed with MARCS model atmospheres to obtain 1D LTE abu…
Photometric detection of internal gravity waves in upper main-sequence stars. II. Combined TESS photometry and high-resolution spectroscopy
Simón-Díaz, S.; Aerts, C.; Bowman, D. M. +5 more
Context. Massive stars are predicted to excite internal gravity waves (IGWs) by turbulent core convection and from turbulent pressure fluctuations in their near-surface layers. These IGWs are extremely efficient at transporting angular momentum and chemical species within stellar interiors, but they remain largely unconstrained observationally.
Galactic cirri in deep optical imaging
Trujillo, Ignacio; Román, Javier; Montes, Mireia
The ubiquitous presence of Galactic cirri in deep optical images represents a major obstacle to study the low surface brightness features of extragalactic sources. To address this issue, we have explored the optical properties of cirri using g, r, i, and z bands in the Sloan Digital Sky Survey (SDSS) Stripe82 region. Using state-of-the-art, custom…
Properties of the dense core population in Orion B as seen by the Herschel Gould Belt survey
White, G. J.; André, Ph.; Arzoumanian, D. +15 more
We present a detailed study of the Orion B molecular cloud complex (d ~ 400 pc), which was imaged with the PACS and SPIRE photometric cameras at wavelengths from 70 to 500 µm as part of the Herschel Gould Belt survey (HGBS). We release new high-resolution maps of column density and dust temperature for the whole complex, derived in the same …
Expected performances of the Characterising Exoplanet Satellite (CHEOPS). III. Data reduction pipeline: architecture and simulated performances
Guterman, P.; Deleuil, M.; Benz, W. +4 more
The CHaracterizing ExOPlanet Satellite (CHEOPS) is set to be launched in December 2019 and will detect and characterize small size exoplanets via ultra high precision photometry during transits. CHEOPS is designed as a follow-up telescope and therefore it will monitor a single target at a time. The scientific users will retrieve science-ready ligh…
A naked-eye triple system with a nonaccreting black hole in the inner binary
Rivinius, Th.; Baade, D.; Klement, R. +2 more
Several dozen optical echelle spectra demonstrate that
Observational constraints on the optical and near-infrared emission from the neutron star-black hole binary merger candidate S190814bv
Covino, S.; D'Avanzo, P.; Campana, S. +151 more
Context. Gravitational wave (GW) astronomy has rapidly reached maturity, becoming a fundamental observing window for modern astrophysics. The coalescences of a few tens of black hole (BH) binaries have been detected, while the number of events possibly including a neutron star (NS) is still limited to a few. On 2019 August 14, the LIGO and Virgo i…