E. F. van Dishoeck
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View article: MINDS: The molecule-rich disc of the Herbig star HD 35929 revealed with JWST/MIRI
MINDS: The molecule-rich disc of the Herbig star HD 35929 revealed with JWST/MIRI Open
Our knowledge of the chemical composition of the gas in the inner disc of intermediate-mass young stars is limited, due to the lack of suitable instrumentation. The launch of JWST has provided a significant improvement in our ability to pr…
View article: The ExoGRAVITY survey: A K-band spectral library of giant exoplanet and brown dwarf companions
The ExoGRAVITY survey: A K-band spectral library of giant exoplanet and brown dwarf companions Open
Direct observations of exoplanet and brown dwarf companions with near-infrared interferometry, first enabled by the dual-field mode of VLTI/GRAVITY, provide unique measurements of the objects' orbital motions and atmospheric compositions. …
View article: MINDS: The very low-mass star and brown dwarf sample
MINDS: The very low-mass star and brown dwarf sample Open
Context . Disks around very low-mass stars (VLMSs) provide environments for the formation of Earth-like planets. Mid-infrared observations have revealed that these disks often exhibit weak silicate features and prominent hydrocarbon emissi…
View article: Sulfur oxides tracing streamers and shocks at low-mass protostellar disk–envelope interfaces
Sulfur oxides tracing streamers and shocks at low-mass protostellar disk–envelope interfaces Open
Accretion shocks are thought to play a crucial role in the early stages of star and planet formation, but direct observational evidence of them remains elusive, particularly regarding the molecular tracers of these processes. In this work,…
View article: MINDS: Detection of an Inner Gas Disk Caused by Evaporating Bodies around HD 172555
MINDS: Detection of an Inner Gas Disk Caused by Evaporating Bodies around HD 172555 Open
Mechanisms such as collisions of rocky bodies or cometary activity give rise to dusty debris disks. Debris disks trace the leftover building blocks of planets, and thus also planetary composition. HD 172555, a stellar twin of β Pic, hosts …
View article: Direct imaging discovery of a young giant planet orbiting on Solar System scales
Direct imaging discovery of a young giant planet orbiting on Solar System scales Open
HD 135344 AB is a young visual binary system that is best known for the protoplanetary disk around the secondary star. The circumstellar environment of the A0-type primary star, on the other hand, is already depleted. HD 135344 A is theref…
View article: Direct imaging discovery of a young giant planet orbiting on Solar System scales
Direct imaging discovery of a young giant planet orbiting on Solar System scales Open
Context . HD 135344 AB is a young visual binary system that is best known for the protoplanetary disk around the secondary star. The circumstellar environment of the A0-type primary star, on the other hand, is already depleted. HD 135344 A…
View article: Orbit and atmosphere of HIP 99770 b through the eyes of VLTI/GRAVITY
Orbit and atmosphere of HIP 99770 b through the eyes of VLTI/GRAVITY Open
Context: Inferring the likely formation channel of giant exoplanets and brown dwarf companions from orbital and atmospheric observables remains a formidable challenge. Further and more precise directly measured dynamical masses of these co…
View article: Orbit and atmosphere of HIP 99770 b through the eyes of VLTI/GRAVITY
Orbit and atmosphere of HIP 99770 b through the eyes of VLTI/GRAVITY Open
Context . Inferring the likely formation channel of giant exoplanets and brown dwarf companions from orbital and atmospheric observables remains a formidable challenge. Further and more precise directly measured dynamical masses of these c…
View article: HDO Ice Detected toward an Isolated Low-mass Protostar with JWST
HDO Ice Detected toward an Isolated Low-mass Protostar with JWST Open
Water is detected in environments representing every stage of star and solar system formation, but its chemical evolution throughout these stages remains poorly constrained. Deuterium ratios offer a means of probing chemical links between …
View article: Unveiling Two Deeply Embedded Young Protostars in the S68N Class 0 Protostellar Core with JWST/NIRSpec
Unveiling Two Deeply Embedded Young Protostars in the S68N Class 0 Protostellar Core with JWST/NIRSpec Open
The near-infrared (NIR) emission of the youngest protostars still needs to be characterized to better understand the evolution of their accretion and ejection activity. We analyze James Webb Space Telescope NIRSpec 1.7–5.3 μ m observations…
View article: MINDS. Water reservoirs of compact planet-forming dust disk: A diversity of H$_2$O distributions
MINDS. Water reservoirs of compact planet-forming dust disk: A diversity of H$_2$O distributions Open
Millimetre-compact dust disks are thought to have efficient radial drift of icy dust pebbles, which has been hypothesised to produce an enhanced cold ($T<$400 K) H$_2$O reservoir in their inner disks. Mid-infrared spectral surveys, now wit…
View article: MINDS: The Very Low-mass Star and Brown Dwarf Sample Hidden Water in Carbon-dominated Protoplanetary Disks
MINDS: The Very Low-mass Star and Brown Dwarf Sample Hidden Water in Carbon-dominated Protoplanetary Disks Open
Infrared observations of the inner disks around very low-mass stars (VLMS; <0.3 M ⊙ ) have revealed a carbon-rich gas composition in the terrestrial planet-forming regions. Contrary to the typically water-rich T Tauri disk spectra, only tw…
View article: MINDS. Anatomy of a water-rich, inclined, brown dwarf disk: lack of abundant hydrocarbons
MINDS. Anatomy of a water-rich, inclined, brown dwarf disk: lack of abundant hydrocarbons Open
2MASS J04381486+2611399 (or J0438) is one of the few young brown dwarfs (BD) with a highly inclined ($i\!\sim\!70^\circ$) disk. Here we report results from JWST-MIRI MRS, HST-ACS and ALMA Band 7 observations. Despite its late spectral type…
View article: Extended source fringe flats for the JWST MIRI Medium Resolution Spectrometer
Extended source fringe flats for the JWST MIRI Medium Resolution Spectrometer Open
Context . The detectors of the JWST Mid-Infrared Instrument (MIRI) Medium Resolution Spectrometer (MRS) form low-finesse resonating cavities that cause periodic count rate modulations (fringes) with peak amplitudes of up to 15% for sources…
View article: JWST-IPA: Chemical Inventory and Spatial Mapping of Ices in the Protostar HOPS 370—Evidence for an Opacity Hole and Thermal Processing of Ices
JWST-IPA: Chemical Inventory and Spatial Mapping of Ices in the Protostar HOPS 370—Evidence for an Opacity Hole and Thermal Processing of Ices Open
The composition of protoplanetary disks, and hence the initial conditions of planet formation, may be strongly influenced by the infall and thermal processing of material during the protostellar phase. The composition of dust and ice in pr…
View article: MIRI-LRS Spectrum of a Cold Exoplanet around a White Dwarf: Water, Ammonia, and Methane Measurements
MIRI-LRS Spectrum of a Cold Exoplanet around a White Dwarf: Water, Ammonia, and Methane Measurements Open
The study of the atmosphere of exoplanets orbiting white dwarfs is a largely unexplored field. With WD 0806-661 b, we present the first deep dive into the atmospheric physics and chemistry of a cold exoplanet around a white dwarf. We obser…
View article: CoCCoA: Complex Chemistry in hot Cores with ALMA
CoCCoA: Complex Chemistry in hot Cores with ALMA Open
Context. Acetone (CH 3 COCH 3 ) is one of the most abundant three-carbon oxygen-bearing complex organic molecules (O-COMs) that have been detected in space. The previous detections were made in the gas phase toward star-forming regions tha…
View article: HCN and C<sub>2</sub>H<sub>2</sub> in the Atmosphere of a T8.5+T9 Brown Dwarf Binary
HCN and C<sub>2</sub>H<sub>2</sub> in the Atmosphere of a T8.5+T9 Brown Dwarf Binary Open
T-type brown dwarfs present an opportunity to explore atmospheres teeming with molecules such as H 2 O, CH 4 , and NH 3 , which exhibit a wealth of absorption features in the mid-infrared. With JWST, we can finally explore this chemistry i…
View article: MIRI Deep Imaging Survey (MIDIS) of the Hubble Ultra Deep Field
MIRI Deep Imaging Survey (MIDIS) of the Hubble Ultra Deep Field Open
Context. The recently launched James Webb Space Telescope (JWST) is opening new observing windows on the distant Universe. Among JWST’s instruments, the Mid Infrared Instrument (MIRI) offers the unique capability of imaging observations at…
View article: HCN and C2H2 in the atmosphere of a T8.5+T9 brown dwarf binary
HCN and C2H2 in the atmosphere of a T8.5+T9 brown dwarf binary Open
T-type brown dwarfs present an opportunity to explore atmospheres teeming with molecules such as H2O, CH4 and NH3, which exhibit a wealth of absorption features in the mid-infrared. With JWST, we can finally explore this chemistry in detai…
View article: The Rich JWST Spectrum of the Western Nucleus of Arp 220: Shocked Hot Core Chemistry Dominates the Inner Disk
The Rich JWST Spectrum of the Western Nucleus of Arp 220: Shocked Hot Core Chemistry Dominates the Inner Disk Open
We present full 3-28 $\mathrm{μm}$ JWST MIRI/MRS and NIRSpec/IFU spectra of the western nucleus of Arp 220, the nearest ultraluminous infrared galaxy. This nucleus has long been suggested to possibly host an embedded Compton-thick AGN. Mil…
View article: MINDS. JWST-MIRI Observations of a Spatially Resolved Atomic Jet and Polychromatic Molecular Wind toward SY Cha
MINDS. JWST-MIRI Observations of a Spatially Resolved Atomic Jet and Polychromatic Molecular Wind toward SY Cha Open
The removal of angular momentum from protostellar systems drives accretion onto the central star and may drive the dispersal of the protoplanetary disk. Winds and jets can contribute to removing angular momentum from the disk, though the d…
View article: Vertical CO surfaces as a probe for protoplanetary disk mass and carbon depletion
Vertical CO surfaces as a probe for protoplanetary disk mass and carbon depletion Open
As the sample of mid-inclination disks with measured CO emission surfaces grows, a fundamental unanswered question is how these vertical profiles connect to their host properties. This project aims to relate the vertical extent of protopla…
View article: MINDS
MINDS Open
Context . The Atacama Large Millimeter/submillimeter Array (ALMA) has revealed that the millimetre dust structures of protoplanetary discs are extremely diverse, ranging from small and compact dust discs to large discs with multiple rings …
View article: MINDS. The influence of outer dust disc structure on the volatile delivery to the inner disc
MINDS. The influence of outer dust disc structure on the volatile delivery to the inner disc Open
ALMA has revealed that the millimetre dust structures of protoplanetary discs are extremely diverse. It has been proposed that the strength of H$_2$O emission in the inner disc particularly depends on the influx of icy pebbles from the out…
View article: MINDS: JWST/NIRCam imaging of the protoplanetary disk PDS 70
MINDS: JWST/NIRCam imaging of the protoplanetary disk PDS 70 Open
Contains fulltext : 316490.pdf (Publisher’s version ) (Open Access)
View article: JOYS: The [D/H] abundance derived from protostellar outflows across the Galactic disk measured with JWST
JOYS: The [D/H] abundance derived from protostellar outflows across the Galactic disk measured with JWST Open
The total deuterium abundance [D/H] in the universe is set by just two processes: the creation of deuterium in Big Bang Nucleosynthesis at an abundance of [D/H]$=2.58\pm0.13\times10^{-5}$, and its destruction within stellar interiors. Meas…