Sebastiaan Krijt
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View article: Dust and water in V883 Ori: Relics of a retreating snowline
Dust and water in V883 Ori: Relics of a retreating snowline Open
V883 Ori is an FU-Orionis-type outburst system characterized by a shoulder at 50–70 au in its ALMA band 6 and 7 intensity profiles. Previously, this feature was attributed to dust pile-up from pebble disintegration at the water snowline. H…
View article: Dust and Water in V883 Ori: Relics of a Retreating Snowline
Dust and Water in V883 Ori: Relics of a Retreating Snowline Open
V883 Ori is an FU-Orionis-type outburst system characterized by a shoulder at 50-70 au in its ALMA band 6 and 7 intensity profiles. Previously, this feature was attributed to dust pile-up from pebble disintegration at the water snowline. H…
View article: Locked in ice: how pebble drift and volatile entrapment can significantly impact carbon and oxygen ratios in evolving protoplanetary discs
Locked in ice: how pebble drift and volatile entrapment can significantly impact carbon and oxygen ratios in evolving protoplanetary discs Open
The complex interplay between the growth, drift, and sublimation of ice-covered pebbles can strongly influence the volatile distribution and evolution of disc composition, and therefore impact the composition of forming planets. Classic pe…
View article: Locked In Ice: how Pebble Drift and Volatile Entrapment can Significantly Impact Carbon and Oxygen Ratios in Evolving Protoplanetary Discs
Locked In Ice: how Pebble Drift and Volatile Entrapment can Significantly Impact Carbon and Oxygen Ratios in Evolving Protoplanetary Discs Open
The complex interplay between the growth, drift, and sublimation of ice-covered pebbles can strongly influence the volatile distribution and evolution of disc composition, and therefore impact the composition of forming planets. Classic pe…
View article: JWST-MIRI Observations of the Irradiated Chemistry in the Inner Disk Cavity of GM Aur
JWST-MIRI Observations of the Irradiated Chemistry in the Inner Disk Cavity of GM Aur Open
We present a spectroscopic analysis of the GM Aur disk using JWST MIRI-MRS, as part of the JWST Disk Infrared Spectral Chemistry Survey (JDISCS). The 1D spectrum exhibits faint dust continuum emission and is relatively poor in molecular ga…
View article: Cosmic Cascades: How Disk Substructure Regulates the Flow of Water to Inner Planetary Systems
Cosmic Cascades: How Disk Substructure Regulates the Flow of Water to Inner Planetary Systems Open
The influx of icy pebbles to the inner regions of protoplanetary disks constitutes a fundamental ingredient in most planet formation theories. The observational determination of the magnitude of this pebble flux and its dependence on disk …
View article: The JDISC Survey: Linking the Physics and Chemistry of Inner and Outer Protoplanetary Disk Zones
The JDISC Survey: Linking the Physics and Chemistry of Inner and Outer Protoplanetary Disk Zones Open
Mid-infrared spectroscopy of protoplanetary disks provides a chemical inventory of gas within a few astronomical unit, where planets are readily detected around older stars. With the James Webb Space Telescope (JWST) Disk Infrared Spectral…
View article: Coordinated Space- and Ground-based Monitoring of Accretion Bursts in a Protoplanetary Disk: Establishing Mid-infrared Hydrogen Lines as Accretion Diagnostics for JWST/MIRI
Coordinated Space- and Ground-based Monitoring of Accretion Bursts in a Protoplanetary Disk: Establishing Mid-infrared Hydrogen Lines as Accretion Diagnostics for JWST/MIRI Open
In this paper, we establish and calibrate mid-infrared (MIR) hydrogen recombination lines observed with the James Webb Space Telescope as accretion tracers for pre-main-sequence stars that accrete from circumstellar disks. This work is par…
View article: Class I/II Jets with JWST: Mass-loss Rates, Asymmetries, and Binary-induced Wigglings
Class I/II Jets with JWST: Mass-loss Rates, Asymmetries, and Binary-induced Wigglings Open
We present JWST NIRSpec spectroimaging observations of jets from four edge-on protoplanetary disks that exhibit clear signatures of MHD disk winds. Bipolar jets are detected and spatially resolved in over 30 shock-excited forbidden lines, …
View article: Coordinated Space and Ground-Based Monitoring of Accretion Bursts in a Protoplanetary Disk: Establishing Mid-Infrared Hydrogen Lines as Accretion Diagnostics for JWST-MIRI
Coordinated Space and Ground-Based Monitoring of Accretion Bursts in a Protoplanetary Disk: Establishing Mid-Infrared Hydrogen Lines as Accretion Diagnostics for JWST-MIRI Open
In this paper, we establish and calibrate mid-infrared hydrogen recombination lines observed with JWST as accretion tracers for pre-main-sequence stars that accrete from circumstellar disks. This work is part of a coordinated, multi-observ…
View article: Water in Protoplanetary Disks with JWST-MIRI: Spectral Excitation Atlas and Radial Distribution from Temperature Diagnostic Diagrams and Doppler Mapping
Water in Protoplanetary Disks with JWST-MIRI: Spectral Excitation Atlas and Radial Distribution from Temperature Diagnostic Diagrams and Doppler Mapping Open
This work aims at providing fundamental general tools for the analysis of water spectra as observed in protoplanetary disks with JWST-MIRI. We analyze 25 high-quality spectra from the JDISC Survey reduced with asteroid calibrators as prese…
View article: The CO-fuelled Time Machine: tracing birth conditions and Terrestrial Planet Formation Outcomes in HD 163296 through Pebble Drift-induced CO Enhancements
The CO-fuelled Time Machine: tracing birth conditions and Terrestrial Planet Formation Outcomes in HD 163296 through Pebble Drift-induced CO Enhancements Open
The architecture and composition of planetary systems are thought to be strongly influenced by the transport and delivery of dust and volatiles via ices on pebbles during the planet formation phase in protoplanetary discs. Understanding th…
View article: Smuggling unnoticed: towards a 2D view of water and dust delivery to the inner regions of protoplanetary discs
Smuggling unnoticed: towards a 2D view of water and dust delivery to the inner regions of protoplanetary discs Open
Infrared spectroscopy, e.g. with JWST, provides a glimpse into the chemical inventory of the innermost region of protoplanetary discs, where terrestrial planets eventually form. The chemical make-up of regions inside snowlines is connected…
View article: Smuggling unnoticed: Towards a 2D view of water and dust delivery to the inner regions of protoplanetary discs
Smuggling unnoticed: Towards a 2D view of water and dust delivery to the inner regions of protoplanetary discs Open
Infrared spectroscopy, e.g., with JWST, provides a glimpse into the chemical inventory of the innermost region of protoplanetary discs, where terrestrial planets eventually form. The chemical make-up of regions inside snowlines is connecte…
View article: The CO-Fuelled Time Machine: Tracing Birth Conditions and Terrestrial Planet Formation Outcomes in HD 163296 through Pebble Drift-induced CO Enhancements
The CO-Fuelled Time Machine: Tracing Birth Conditions and Terrestrial Planet Formation Outcomes in HD 163296 through Pebble Drift-induced CO Enhancements Open
The architecture and composition of planetary systems are thought to be strongly influenced by the transport and delivery of dust and volatiles via ices on pebbles during the planet formation phase in protoplanetary discs. Understanding th…
View article: The First JWST View of a 30-Myr-old Protoplanetary Disk Reveals a Late-stage Carbon-rich Phase
The First JWST View of a 30-Myr-old Protoplanetary Disk Reveals a Late-stage Carbon-rich Phase Open
We present a JWST MIRI/MRS spectrum of the inner disk of WISE J044634.16–262756.1B (hereafter J0446B), an old (∼34 Myr) M4.5 star but with hints of ongoing accretion. The spectrum is molecule-rich and dominated by hydrocarbons. We detect 1…
View article: The First JWST View of a 30-Myr-old Protoplanetary Disk Reveals a Late-stage Carbon-rich Phase
The First JWST View of a 30-Myr-old Protoplanetary Disk Reveals a Late-stage Carbon-rich Phase Open
We present a JWST MIRI/MRS spectrum of the inner disk of WISE J044634.16$-$262756.1B (hereafter J0446B), an old ($\sim$34 Myr) M4.5 star but with hints of ongoing accretion. The spectrum is molecule-rich and dominated by hydrocarbons. We d…
View article: JWST/MIRI Detection of a Carbon-rich Chemistry in the Disk of a Solar Nebula Analog
JWST/MIRI Detection of a Carbon-rich Chemistry in the Disk of a Solar Nebula Analog Open
It has been proposed, and confirmed by multiple observations, that disks around low-mass stars display a molecule-rich emission and carbon-rich disk chemistry as compared to their hotter, more massive solar counterparts. In this work, we p…
View article: Retrieval of Thermally Resolved Water Vapor Distributions in Disks Observed with JWST-MIRI
Retrieval of Thermally Resolved Water Vapor Distributions in Disks Observed with JWST-MIRI Open
The mid-infrared water vapor emission spectrum provides a novel way to characterize the delivery of icy pebbles toward the innermost (<5 au) regions of planet-forming disks. Recently, JWST MIRI-MRS showed that compact disks exhibit an exce…
View article: JWST/MIRI detection of a carbon-rich chemistry in a solar nebula analog
JWST/MIRI detection of a carbon-rich chemistry in a solar nebula analog Open
It has been proposed, and confirmed by multiple observations, that disks around low mass stars display a molecule-rich emission and carbon-rich disk chemistry as compared to their hotter, more massive solar counterparts. In this work, we p…
View article: The nested morphology of disk winds from young stars revealed by JWST/NIRSpec observations
The nested morphology of disk winds from young stars revealed by JWST/NIRSpec observations Open
View article: A closer look at individual collisions of dust aggregates: material mixing and exchange on microscopic scales
A closer look at individual collisions of dust aggregates: material mixing and exchange on microscopic scales Open
Collisions between aggregates with different histories and compositions are expected to be commonplace in dynamically active protoplanetary discs. None the less, relatively little is known about how collisions themselves may contribute to …
View article: A closer look at individual collisions of dust aggregates: Material mixing and exchange on microscopic scales
A closer look at individual collisions of dust aggregates: Material mixing and exchange on microscopic scales Open
Collisions between aggregates with different histories and compositions are expected to be commonplace in dynamically active protoplanetary discs. Nonetheless, relatively little is known about how collisions themselves may contribute to th…
View article: Water in protoplanetary disks with JWST-MIRI: spectral excitation atlas and radial distribution from temperature diagnostic diagrams and Doppler mapping
Water in protoplanetary disks with JWST-MIRI: spectral excitation atlas and radial distribution from temperature diagnostic diagrams and Doppler mapping Open
This work aims at providing fundamental general tools for the analysis of water spectra as observed in protoplanetary disks with JWST-MIRI. We analyze 25 high-quality spectra from the JDISC Survey reduced with asteroid calibrators as prese…
View article: Retrieval of Thermally-Resolved Water Vapor Distributions in Disks Observed with JWST-MIRI
Retrieval of Thermally-Resolved Water Vapor Distributions in Disks Observed with JWST-MIRI Open
The mid-infrared water vapor emission spectrum provides a novel way to characterize the delivery of icy pebbles towards the innermost ($<5$ au) regions of planet-forming disks. Recently, JWST MIRI-MRS showed that compact disks exhibit an e…
View article: High-contrast JWST-MIRI Spectroscopy of Planet-forming Disks for the JDISC Survey
High-contrast JWST-MIRI Spectroscopy of Planet-forming Disks for the JDISC Survey Open
The JWST Disk Infrared Spectral Chemistry Survey (JDISCS) aims to understand the evolution of the chemistry of inner protoplanetary disks using the Mid-InfraRed Instrument (MIRI) on the James Webb Space Telescope (JWST). With a growing sam…
View article: Surviving the heat: multiwavelength analysis of V883 Ori reveals that dust aggregates survive the sublimation of their ice mantles
Surviving the heat: multiwavelength analysis of V883 Ori reveals that dust aggregates survive the sublimation of their ice mantles Open
Investigating the response of icy dust aggregates to water ice sublimation is essential for understanding the formation and properties of planetesimals in protoplanetary discs. However, their fate remains unclear, as previous studies sugge…
View article: Surviving the Heat: multi-wavelength analysis of V883 Ori reveals that dust aggregates survive the sublimation of their ice mantles
Surviving the Heat: multi-wavelength analysis of V883 Ori reveals that dust aggregates survive the sublimation of their ice mantles Open
Investigating the response of icy dust aggregates to water ice sublimation is essential for understanding the formation and properties of planetesimals in protoplanetary discs. However, their fate remains unclear, as previous studies sugge…
View article: Water-rich Disks around Late M Stars Unveiled: Exploring the Remarkable Case of Sz 114
Water-rich Disks around Late M Stars Unveiled: Exploring the Remarkable Case of Sz 114 Open
We present an analysis of the JDISCS JWST/MIRI-MRS spectrum of Sz 114, an accreting M5 star surrounded by a large dust disk with a shallow gap at ∼39 au. The spectrum is molecule-rich; we report the detection of water, CO, CO 2 , HCN, C 2 …
View article: JWST Reveals Excess Cool Water near the Snow Line in Compact Disks, Consistent with Pebble Drift
JWST Reveals Excess Cool Water near the Snow Line in Compact Disks, Consistent with Pebble Drift Open
Previous analyses of mid-infrared water spectra from young protoplanetary disks observed with the Spitzer-IRS found an anticorrelation between water luminosity and the millimeter dust disk radius observed with ALMA. This trend was suggeste…