Publications (59)
Carbon monoxide gas produced by a giant impact in the inner region of a young system
Tajana Schneiderman, Luca MatrÃ, Alan P. Jackson +7
Models of terrestrial planet formation predict that the final stages of planetary assembly, lasting tens of millions of years beyond the dispersal of young protoplanetary disks, ar…
Scattering of exocomets by a planet chain: exozodi levels and the delivery of cometary material to inner planets
Sebastian Marino, Amy Bonsor, Mark C. Wyatt +1
Exocomets scattered by planets have been invoked to explain observations in multiple contexts, including the frequently found near- and mid-infrared excess around nearby stars aris…
Exoplanet recycling in massive white-dwarf debris discs
Rik van Lieshout, Quentin Kral, Sébastien Charnoz +2
Several tens of white dwarfs are known to host circumstellar discs of dusty debris, thought to arise from the tidal disruption of rocky bodies originating in the star's remnant pla…
The vertical structure of debris disks and the impact of gas
Johan Olofsson, Philippe Thébault, Quentin Kral +10
The vertical structure of debris disks provides clues about their dynamical evolution and the collision rate of the unseen planetesimals. Thanks to the ever-increasing angular reso…
An ALMA Survey of M-dwarfs in the Beta Pictoris Moving Group with Two New Debris Disc Detections
Patrick F. Cronin-Coltsmann, Grant M. Kennedy, Quentin Kral +4
Previous surveys in the far-infrared have found very few, if any, M-dwarf debris discs among their samples. It has been questioned whether M-dwarf discs are simply less common than…
Exozodiacal clouds: Hot and warm dust around main sequence stars
Quentin Kral, Alexander V. Krivov, Denis Defrere +7
A warm/hot dust component (at temperature 300K) has been detected around 20% of stars. This component is called "exozodiacal dust" as it presents similarities with the z…
First resolved observations of a highly asymmetric debris disc around HD 160305 with VLT/SPHERE
Clément Perrot, Philippe Thebault, Anne-Marie Lagrange +36
Context. Direct imaging of debris discs gives important information about their nature, their global morphology, and allows us to identify specific structures possibly in connectio…
Using warm dust to constrain unseen planets
Amy Bonsor, Mark C. Wyatt, Quentin Kral +3
Cold outer debris belts orbit a significant fraction of stars, many of which are planet-hosts. Radiative forces from the star lead to dust particles leaving the outer belts and spi…
Star and Planet Formation with the Single Aperture Large Telescope for Universe Studies (SALTUS) Space Observatory
Kamber Schwarz, Alexander Tielens, Joan Najita +10
The Single Aperture Large Telescope for Universe Studies (SALTUS) is a far-infrared space mission concept with unprecedented spatial and spectral resolution. Saltus consists of a 1…
A multi-wavelength study of the debris disc around 49 Cet
Nicole Pawellek, Attila Moór, Julien Milli +17
In a multi-wavelength study of thermal emission and scattered light images we analyse the dust properties and structure of the debris disc around the A1-type main sequence star 49~…
Exocomets from a Solar System Perspective
Paul A. Strøm, Dennis Bodewits, Matthew M. Knight +24
Exocomets are small bodies releasing gas and dust which orbit stars other than the Sun. Their existence was first inferred from the detection of variable absorption features in ste…
A re-investigation of debris disc halos
Philippe Thebault, Johan Olofsson, Quentin Kral
A significant fraction of debris discs consist of a bright ring beyond which extends a wide halo. Such a halo should be made of small grains produced in the ring of parent bodies (…
Revealing asymmetrical dust distribution in the inner regions of HD 141569
Garima Singh, Trisha Bhowmik, Anthony Boccaletti +42
We obtained polarimetric differential imaging of a gas-rich debris disk around HD 141569A with SPHERE in the H-band to compare the scattering properties of the innermost ring at 44…
Stellar winds can affect gas dynamics in debris disks and create observable belt winds
Quentin Kral, James Pringle, Luca Matrà +1
Context: Gas is now detected in many extrasolar systems around mature stars aged between 10 Myr to 1 Gyr with planetesimal belts. Gas in these mature disks is thought to be…
A roadmap for the atmospheric characterization of terrestrial exoplanets with JWST
TRAPPIST-1 JWST Community Initiative, :, Julien de Wit +80
Ultra-cool dwarf stars are abundant, long-lived, and uniquely suited to enable the atmospheric study of transiting terrestrial companions with JWST. Amongst them, the most prominen…
A low-mass stellar companion to the young variable star RZ Psc
Grant M. Kennedy, Christian Ginski, Matthew A. Kenworthy +10
RZ Psc is a young Sun-like star with a bright and warm infrared excess that is occasionally dimmed significantly by circumstellar dust structures. Optical depth arguments suggest t…
Understanding the trans-Neptunian Solar system: Reconciling the results of serendipitous stellar occultations and the inferences from the cratering record
Andrew Shannon, Alain Doressoundiram, Françoise Roques +2
The most pristine remnants of the Solar system's planet formation epoch orbit the Sun beyond Neptune, the small bodies of the trans-Neptunian object populations. The bulk of the ma…
Planet Formation Imager (PFI): science vision and key requirements
Stefan Kraus, John D. Monnier, Michael J. Ireland +75
The Planet Formation Imager (PFI) project aims to provide a strong scientific vision for ground-based optical astronomy beyond the upcoming generation of Extremely Large Telescopes…
Maximum Kolmogorov-Sinai entropy vs minimum mixing time in Markov chains
Martin Mihelich, Berengere Dubrulle, Didier Paillard +2
Many modern techniques employed in physics, such a computation of path integrals, rely on random walks on graphs that can be represented as Markov chains. Traditionally, estimates…
Dynamics of cold circumstellar gas in debris disks
Can Cui, Sebastian Marino, Quentin Kral +1
Mounting observational evidence indicates that cold circumstellar gas is present in debris disk systems. This work focuses on various dynamical processes that debris-disk gas may u…
Environmental transition: overview of actions to reduce the environmental footprint of astronomy
Lucie Leboulleux, Faustine Cantalloube, Marie-Alice Foujols +15
To keep current global warming below 1.5°C compared with the pre-industrial era, measures must be taken as quickly as possible in all spheres of society. Astronomy must also make…
Water gas discs in exo-asteroid belts
Paul Huet, Quentin Kral, Louis Manchon
The paper models how water ice sublimates in exo‑asteroid belts to form water vapour discs, explores their evolution and the amount of water that can be delivered to inner planets,…
Exocometary Science
Luca MatrÃ, Quentin Kral, Kate Su +20
Evidence for exocomets, icy bodies in extrasolar planetary systems, has rapidly increased over the past decade. Volatiles are detected through the gas that exocomets release as the…
Polarization from Aligned Dust Grains in the Pic Debris Disk
Charles L. H. Hull, Haifeng Yang, Paulo C. Cortés +8
We present 870 m ALMA polarization observations of thermal dust emission from the iconic, edge-on debris disk Pic. While the spatially resolved map does not exhibit detect…
An impact-free mechanism to deliver water to terrestrial planets and exoplanets
Quentin Kral, Paul Huet, Camille Bergez-Casalou +3
To date, the most widespread scenario is that the Earth originated without water and was brought to the planet mainly due to impacts by wet asteroids coming from further out in spa…
Circumstellar discs: What will be next?
Quentin Kral, Cathie Clarke, Mark Wyatt
This prospective chapter gives our view on the evolution of the study of circumstellar discs within the next 20 years from both observational and theoretical sides. We first presen…
Late gas released in the young Kuiper belt could have significantly contributed to the carbon enrichment of the atmospheres of Neptune and Uranus
Paul Huet, Quentin Kral, Tristan Guillot
Exo-Kuiper belts have been observed for decades, but the recent detection of gas in some of them may change our view of the Solar System's youth. Late gas produced by the sublimati…
Cometary impactors on the TRAPPIST-1 planets can destroy all planetary atmospheres and rebuild secondary atmospheres on planets f, g, h
Quentin Kral, Mark C. Wyatt, Amaury H. M. J. Triaud +3
The TRAPPIST-1 system is unique in that it has a chain of seven terrestrial Earth-like planets located close to or in its habitable zone. In this paper, we study the effect of pote…
ALMA Observations of the HD~110058 debris disk
Antonio S. Hales, SebastiÃn Marino, Patrick D. Sheehan +7
We present Atacama Large Millimeter Array (ALMA) observations of the young, gas-rich debris disk around HD110058 at 0.3-0.6\arcsec resolution. The disk is detected in the 0.85 and…
Debris discs in binaries: morphology and photometric signatures
Philippe Thebault, Quentin Kral, Johan Olofsson
We aim to see whether debris belts evolving in between two stars may be impacted by the presence of the companion and whether this leaves any detectable signature that could be obs…
The beta Pictoris system: Setting constraints on the planet and the disk structures at mid-IR wavelengths with NEAR
Nour Skaf, Anthony Boccaletti, Eric Pantin +26
[abridged] We analyzed mid-infrared high-contrast coronagraphic images of the beta Pictoris system, taking advantage of the NEAR experiment using the VLT/VISIR instrument. The goal…
Morphology of the gas-rich debris disk around HD 121617 with SPHERE observations in polarized light
Clément Perrot, Johan Olofsson, Quentin Kral +7
Debris disks are the signposts of collisionally eroding planetesimal circumstellar belts, whose study can put important constraints on the structure of extrasolar planetary systems…
Transient events in bright debris discs: Collisional avalanches revisited
Philippe Thebault, Quentin Kral
A collisional avalanche is set off by the breakup of a large planetesimal, releasing small unbound grains that enter a debris disc located further away from the star, triggering th…
Predictions for the secondary CO, C and O gas content of debris discs from the destruction of volatile-rich planetesimals
Quentin Kral, Luca Matra, Mark Wyatt +1
This paper uses observations of dusty debris discs, including a growing number of gas detections in these systems, to test our understanding of the origin and evolution of this gas…
New millimeter CO observations of the gas-rich debris disks 49 Cet and HD 32297
Attila Moór, Quentin Kral, Péter Ãbrahám +7
Previous observations revealed the existence of CO gas at nearly protoplanetary level in several dust-rich debris disks around young A-type stars. Here we used the ALMA 7m-array to…
The magnetorotational instability in debris-disc gas
Quentin Kral, Henrik Latter
Debris discs are commonly swathed in gas which can be observed in UV, in fine structure lines in FIR, and in resolved maps of CO emission. Carbon and oxygen are overabundant in suc…
Stirred but not shaken: a multi-wavelength view of HD 16743's debris disc
Jonathan P. Marshall, Julien Milli, Elodie Choquet +6
Planetesimals -- asteroids and comets -- are the building blocks of planets in protoplanetary discs and the source of dust, ice and gas in debris discs. Along with planets they com…
Secondary gas in debris discs released following the decay of long-lived radioactive nuclides, catastrophic or resurfacing collisions
Amy Bonsor, Mark C. Wyatt, Sebastian Marino +3
Kuiper-like belts of planetesimals orbiting stars other than the Sun are most commonly detected from the thermal emission of small dust produced in collisions. Emission from gas, m…
Planet Signatures in Collisionally Active Debris Discs: scattered light images
Philippe Thebault, Quentin Kral, Steve Ertel
Planet perturbations are often invoked as a potential explanation for many spatial structures that have been imaged in debris discs. So far this issue has been mostly investigated…
A molecular wind blows out of the Kuiper belt
Quentin Kral, J. E. Pringle, Aurélie Guilbert-Lepoutre +9
Gas has been detected in many exoplanetary systems (10 Myr), thought to be released in the destruction of volatile-rich planetesimals orbiting in exo-Kuiper belts. In this lette…
Evolution of protoplanetary disks from their taxonomy in scattered light: spirals, rings, cavities, and shadows
Antonio Garufi, Myriam Benisty, Paola Pinilla +11
The variety of observed protoplanetary disks in polarimetric light motivates a taxonomical study to constrain their evolution and establish the current framework of this type of ob…
Near-infrared scattered light properties of the HR4796A dust ring: a measured scattering phase function from 13.6deg to 166.6deg
Julien Milli, Arthur Vigan, David. Mouillet +27
HR4796A is surrounded by a debris disc, observed in scattered light as an inclined ring. Past observations raised several questions. First, a strong brightness asymmetry detected i…
Signatures of massive collisions in debris discs
Quentin Kral, Philippe Thebault, Jean-Charles Augereau +2
Violent stochastic collisional events have been invoked as a possible explanation for some debris discs displaying pronounced asymmetries or having a great luminosity excess. So fa…
Effects of disc asymmetries on astrometric measurements - Can they mimic planets?
Quentin Kral, Jean Schneider, Grant Kennedy +1
Astrometry covers a parameter space that cannot be reached by RV or transit methods to detect terrestrial planets on wide orbits. In addition, high accuracy astrometric measurement…
A self-consistent model for the evolution of the gas produced in the debris disc of Pictoris
Quentin Kral, Mark Wyatt, Robert Carswell +3
This paper presents a self-consistent model for the evolution of gas produced in the debris disc of Pictoris. Our model proposes that atomic carbon and oxygen are created from…
Abundance analysis of stars hosting gas-rich debris disks
Sandipan P. D. Borthakur, Mihkel Kama, Luca Fossati +4
Accretion from protoplanetary or debris disks can contaminate the stellar photosphere, which is detectable in stars with radiative envelopes due to relatively slower photospheric m…
Imaging [CI] around HD 131835: reinterpreting young debris discs with protoplanetary disc levels of CO gas as shielded secondary discs
Quentin Kral, Sebastian Marino, Mark C. Wyatt +2
Despite being Myr, there are 10 debris discs with as much CO gas as in protoplanetary discs. Such discs have been assumed to be "hybrid", i.e., with secondary dust but p…
The trail of water and the delivery of volatiles to habitable planets
Klaus M. Pontoppidan, Andrea Banzatti, Edwin Bergin +16
Water is fundamental to our understanding of the evolution of planetary systems and the delivery of volatiles to the surfaces of potentially habitable planets. Yet, we currently ha…
Survey of planetesimal belts with ALMA: gas detected around the Sun-like star HD 129590
Quentin Kral, Luca Matra, Grant Kennedy +2
Gas detection around main sequence stars is becoming more common with around 20 systems showing the presence of CO. However, more detections are needed, especially around later spe…
Is there more than meets the eye? Presence and role of submicron grains in debris discs
Philippe Thebault, Quentin Kral
The presence of submicron grains has been inferred in several debris discs, despite the fact that these particles should be blown out by stellar radiation pressure on very short ti…
Grain Size segregation in debris discs
Philippe Thebault, Quentin Kral, Jean-Charles Augereau
In most debris discs, dust grain dynamics is strongly affected by stellar radiation pressure. As this mechanism is size-dependent, we expect dust grains to be spatially segregated…
LIDT-DD: A new self-consistent debris disc model including radiation pressure and coupling collisional and dynamical evolution
Quentin Kral, Philippe Thébault, Sébastien Charnoz
In most current debris disc models, the dynamical and the collisional evolutions are studied separately, with N-body and statistical codes, respectively, because of stringent compu…
The Disk Gas Mass and the Far-IR Revolution
Edwin A. Bergin, Klaus M. Pontoppidan, Charles M. Bradford +13
The gaseous mass of protoplanetary disks is a fundamental quantity in planet formation. The presence of gas is necessary to assemble planetesimals, it determines timescales of gian…
Primordial or Secondary? Testing models of debris disk gas with ALMA
Gianni Cataldi, Yuri Aikawa, Kazunari Iwasaki +13
The origin and evolution of gas in debris disks is still not well understood. Secondary gas production from cometary material or a primordial origin have been proposed. So far, obs…
ALMA's view of the M-dwarf GSC 07396-00759's edge-on debris disc: AU Mic's coeval twin
Patrick F. Cronin-Coltsmann, Grant M. Kennedy, Christian Adam +7
We present new ALMA Band 7 observations of the edge-on debris disc around the M1V star GSC 07396-00759. At ~20 Myr old and in the beta Pictoris Moving Group along with AU Mic, GSC…
Review of gas and dust in debris discs
Quentin Kral
This proceeding summarises a talk given on the state-of-the-art of debris disc modelling. We first review the basics of debris disc physics, which is followed by a short overview o…
The unseen planets of double belt debris disk systems
Andrew Shannon, Amy Bonsor, Quentin Kral +1
The gap between two component debris disks is often taken to be carved by intervening planets scattering away the remnant planetesimals. We employ N-body simulations to determine h…
Formation of secondary atmospheres on terrestrial planets by late disk accretion
Quentin Kral, Jeanne Davoult, Benjamin Charnay
Recently, gas disks have been discovered around main sequence stars well beyond the usual protoplanetary disk lifetimes (i.e., > 10 Myrs), when planets have already formed. These g…
Deep ALMA Search for CO Gas in the HD 95086 Debris Disc
Mark Booth, Luca MatrÃ, Kate Y. L. Su +7
One of the defining properties of debris discs compared to protoplanetary discs used to be their lack of gas, yet small amounts of gas have been found around an increasing number o…