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View article: The SPHERE infrared survey for exoplanets (SHINE)
The SPHERE infrared survey for exoplanets (SHINE) Open
Context. Over the past decade, large surveys with state-of-the-art planet-finder instruments such as Spectro-Polarimetric High-contrast Exoplanet REsearch on board Very Large Telescope (SPHERE@VLT), coupled with coronagraphic devices and e…
View article: The SPHERE infrared survey for exoplanets (SHINE). V. Complete observations, data reduction and analysis, detection performances, and final results
The SPHERE infrared survey for exoplanets (SHINE). V. Complete observations, data reduction and analysis, detection performances, and final results Open
During the past decade, state-of-the-art planet-finder instruments like SPHERE@VLT, coupling coronagraphic devices and extreme adaptive optics systems, unveiled, thanks to large surveys, around 20 planetary mass companions at semi-major ax…
View article: Associating LOFAR Galactic Faraday structures with the warm neutral medium
Associating LOFAR Galactic Faraday structures with the warm neutral medium Open
Faraday tomography observations with the Low Frequency Array (LOFAR) have unveiled a remarkable network of structures in polarized synchrotron emission at high Galactic latitudes. The observed correlation between LOFAR structures, dust pol…
View article: EMIR, the near-infrared camera and multi-object spectrograph for the GTC
EMIR, the near-infrared camera and multi-object spectrograph for the GTC Open
We present EMIR, a powerful near-infrared (NIR) camera and multi-object spectrograph (MOS) installed at the Nasmyth focus of the 10.4 m GTC. EMIR was commissioned in mid-2016 and is offered as a common-user instrument. It provides spectral…
View article: The SPHERE infrared survey for exoplanets (SHINE): II. Observations, data reduction and analysis, detection performances, and initial results
The SPHERE infrared survey for exoplanets (SHINE): II. Observations, data reduction and analysis, detection performances, and initial results Open
Context. In recent decades, direct imaging has confirmed the existence of substellar companions (exoplanets or brown dwarfs) on wide orbits (>10 au) around their host stars. In striving to understand their formation and evolution mechanism…
View article: The SPHERE infrared survey for exoplanets (SHINE)
The SPHERE infrared survey for exoplanets (SHINE) Open
Context. In recent decades, direct imaging has confirmed the existence of substellar companions (exoplanets or brown dwarfs) on wide orbits (>10 au) around their host stars. In striving to understand their formation and evolution mechanism…
View article: The SPHERE infrared survey for exoplanets (SHINE)
The SPHERE infrared survey for exoplanets (SHINE) Open
The SpHere INfrared Exoplanet (SHINE) project is a 500-star survey performed with SPHERE on the Very Large Telescope for the purpose of directly detecting new substellar companions and understanding their formation and early evolution. Her…
View article: The Composition, Excitation, and Physical State of Atomic Gas in the Debris Disk Surrounding 51 Oph<sup>∗</sup>
The Composition, Excitation, and Physical State of Atomic Gas in the Debris Disk Surrounding 51 Oph<sup>∗</sup> Open
We measured 304 absorption features in the ultraviolet and visible spectra of the star 51 Oph, which is known to have a debris disk with a high inclination. We analyzed the relative populations of atoms in excited fine-structure and metast…
View article: The Composition, Excitation, and Physical State of Atomic Gas in the Debris Disk Surrounding 51 Oph
The Composition, Excitation, and Physical State of Atomic Gas in the Debris Disk Surrounding 51 Oph Open
We measured 304 absorption features in the ultraviolet and visible spectra of the star 51 Oph, which is known to have a debris disk with a high inclination. We analyzed the relative populations of atoms in excited fine-structure and metast…
View article: SPHERE: the exoplanet imager for the Very Large Telescope
SPHERE: the exoplanet imager for the Very Large Telescope Open
Observations of circumstellar environments that look for the direct signal of exoplanets and the scattered light from disks have significant instrumental implications. In the past 15 years, major developments in adaptive optics, coronagrap…
View article: Precision measurement of magnetic field from near to far, from fine to large scales in ISM
Precision measurement of magnetic field from near to far, from fine to large scales in ISM Open
Magnetic fields have important or dominant effects in many areas of astrophysics, but have been very difficult to quantify. Spectropolarimetry from Ground State Alignment (GSA) has been suggested as a direct tracer of magnetic field in int…
View article: Astro2020 Science White Paper: ISM and CGM in external galaxies
Astro2020 Science White Paper: ISM and CGM in external galaxies Open
The wavelength range 912-2000A (hereafter far-UV) provides access to absorption lines of the interstellar medium (ISM), circumgalactic medium (CGM), and intergalactic medium (IGM) in phases spanning a wide range of ionization, density, tem…
View article: Far to near UV spectroscopy of the interstellar medium at very high resolution and very high signal-to-noise ratio
Far to near UV spectroscopy of the interstellar medium at very high resolution and very high signal-to-noise ratio Open
A comprehensive study of interstellar medium phases and the nature of their boundaries or connections requires comparing abundances and velocity profiles from tracers of the different phases. In the UV, studies of a wealth of absorption fe…
View article: Post-conjunction detection of <i>β</i> Pictoris b with VLT/SPHERE
Post-conjunction detection of <i>β</i> Pictoris b with VLT/SPHERE Open
Context. With an orbital distance comparable to that of Saturn in the solar system, β Pictoris b is the closest (semi-major axis ≃9 au) exoplanet that has been imaged to orbit a star. Thus it offers unique opportunities for detailed studie…
View article: Discovery of a planetary-mass companion within the gap of the transition disk around PDS 70★★★
Discovery of a planetary-mass companion within the gap of the transition disk around PDS 70★★★ Open
Context. Young circumstellar disks are the birthplaces of planets. Their study is of prime interest to understand the physical and chemical conditions under which planet formation takes place. Only very few detections of planet candidates …
View article: The science case for POLLUX, a high-resolution UV spectropolarimeter onboard LUVOIR
The science case for POLLUX, a high-resolution UV spectropolarimeter onboard LUVOIR Open
POLLUX is a high-resolution, UV spectropolarimeter proposed for the 15-meter\nprimary mirror option of LUVOIR. The instrument Phase 0 study is supported by\nthe French Space Agency (CNES) and performed by a consortium of European\nscientis…
View article: Observations of fast-moving features in the debris disk of AU Mic on a three-year timescale: Confirmation and new discoveries★★★
Observations of fast-moving features in the debris disk of AU Mic on a three-year timescale: Confirmation and new discoveries★★★ Open
Context. The nearby and young M star AU Mic is surrounded by a debris disk in which we previously identified a series of large-scale arch-like structures that have never been seen before in any other debris disk and that move outward at hi…
View article: The science case for POLLUX, a high-resolution UV spectropolarimeter onboard LUVOIR
The science case for POLLUX, a high-resolution UV spectropolarimeter onboard LUVOIR Open
POLLUX is a high-resolution, UV spectropolarimeter proposed for the 15-meter primary mirror option of LUVOIR. The instrument Phase 0 study is supported by the French Space Agency (CNES) and performed by a consortium of European scientists.…
View article: H<sub>2</sub> formation on interstellar dust grains: The viewpoints of theory, experiments, models and observations
H<sub>2</sub> formation on interstellar dust grains: The viewpoints of theory, experiments, models and observations Open
Molecular hydrogen is the most abundant molecule in the universe. It is the first one to form and survive photo-dissociation in tenuous environments. Its formation involves catalytic reactions on the surface of interstellar grains. The mic…
View article: Investigation of the inner structures around HD 169142 with VLT/SPHERE
Investigation of the inner structures around HD 169142 with VLT/SPHERE Open
We present observations of the Herbig Ae star HD 169142 with the VLT/SPHERE instruments InfraRed Dual-band Imager and Spectrograph (IRDIS) (K1K2 and H2H3 bands) and the Integral Field Spectrograph (IFS) (Y, J and H bands). We detect severa…
View article: Orbiting a binary
Orbiting a binary Open
Aims. In this paper we present the results of the SPHERE observation of the HD 284149 system, aimed at a more detailed characterisation of both the primary and its brown dwarf companion. Methods. We observed HD 284149 in the near-infrared …
View article: Orbiting a binary: SPHERE characterisation of the HD 284149 system
Orbiting a binary: SPHERE characterisation of the HD 284149 system Open
In this paper we present the results of the SPHERE observation of the HD 284149 system, aimed at a more detailed characterisation of both the primary and its brown dwarf companion. We observed HD 284149 in the near-infrared with SPHERE, us…
View article: The nearby interstellar medium toward α Leo. UV observations and modeling of a warm cloud within hot gas
The nearby interstellar medium toward α Leo. UV observations and modeling of a warm cloud within hot gas Open
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View article: The nearby interstellar medium toward <i>α</i> Leo
The nearby interstellar medium toward <i>α</i> Leo Open
Aims. Our aim is to characterize the conditions in the nearest interstellar cloud. Methods. We analyze interstellar absorption features in the full UV spectrum of the nearby ( d = 24 pc) B8 IVn star α Leo (Regulus). Observations were obtai…
View article: The nearby interstellar medium towards alpha Leo -- UV observations and modeling of a warm cloud within hot gas
The nearby interstellar medium towards alpha Leo -- UV observations and modeling of a warm cloud within hot gas Open
We analyze interstellar absorption features in the full UV spectrum of the nearby (d = 24 pc) B8 IVn star alpha Leo (Regulus) obtained at high resolution and high S/N by the HST ASTRAL Treasury program. We derive column densities for many …