M. C. Wyatt
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View article: The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. VI. Evidence for Radially Evolving Icy Grains in the HD 141569A Disk via NIRCam Coronagraphic Imaging
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. VI. Evidence for Radially Evolving Icy Grains in the HD 141569A Disk via NIRCam Coronagraphic Imaging Open
We present JWST NIRCam coronagraphic observations of the HD 141569A circumstellar disk, obtained as part of the JWST Early Release Science program. The observations recover the multi-ringed structure seen in previous shorter-wavelength obs…
View article: Re-accretion of giant impact ejecta can drive significant atmospheric erosion on terrestrial planets
Re-accretion of giant impact ejecta can drive significant atmospheric erosion on terrestrial planets Open
Giant impacts, the collisions between planetary embryos, play a crucial role in sculpting the planets and their orbital architectures. Numerical simulations have advanced our understanding of these events, enabling estimations of mass and …
View article: The MIRI Excesses around Degenerates (MEAD) Survey I: A candidate cold brown dwarf in orbit around the nearby white dwarf 2MASS J09424023-4637176
The MIRI Excesses around Degenerates (MEAD) Survey I: A candidate cold brown dwarf in orbit around the nearby white dwarf 2MASS J09424023-4637176 Open
The MIRI Excesses Around Degenerates Survey is a Cycle 2 James Webb Space Telescope (JWST) Survey program designed to image nearby white dwarfs in the mid-IR with the MIRI imaging mode. Only a handful of white dwarfs have previously been o…
View article: Theory of Exozodi Sources and Dust Evolution
Theory of Exozodi Sources and Dust Evolution Open
Exozodiacal dust disks (exozodis) are populations of warm (∼300 K) or hot (∼1000 K) dust, located in or interior to a star’s habitable zone, detected around ∼25% of main-sequence stars as excess emission over the stellar photosphere at mid…
View article: The vertical structure of debris discs and the role of disc gravity: a primer using a simplified model
The vertical structure of debris discs and the role of disc gravity: a primer using a simplified model Open
Debris discs provide valuable insights into the formation and evolution of exoplanetary systems. Their structures are commonly attributed to planetary perturbations, serving as probes of as-yet-undetected planets. However, most studies of …
View article: High Resolution ALMA Data of the Fomalhaut Debris Disk Confirms Apsidal Width Variation
High Resolution ALMA Data of the Fomalhaut Debris Disk Confirms Apsidal Width Variation Open
We present long-baseline observations of the Fomalhaut outer debris disk at 223 GHz (1.3 mm) from Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 5, which we use along with archival short-baseline observations to produce a 0 …
View article: ALMA Reveals an Eccentricity Gradient in the Fomalhaut Debris Disk
ALMA Reveals an Eccentricity Gradient in the Fomalhaut Debris Disk Open
We present evidence of a negative eccentricity gradient in the debris disk of the nearby A-type main-sequence star, Fomalhaut. Fitting to the high-resolution, archival ALMA 1.32 mm continuum data for Fomalhaut (with a synthesized angular r…
View article: Activity in white dwarf debris discs I: <i>Spitzer</i> legacy reveals variability incompatible with the canonical model
Activity in white dwarf debris discs I: <i>Spitzer</i> legacy reveals variability incompatible with the canonical model Open
This study presents all available multi-epoch 3.6 and 4.5 $\mu$m photometry from Spitzer Space Telescope observations of white dwarf debris discs, including weekly cadence observations of 16 relatively bright systems, and 5 h staring-mode …
View article: Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of <i>α</i> Centauri A. I. Observations, Orbital and Physical Properties, and Exozodi Upper Limits
Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of <i>α</i> Centauri A. I. Observations, Orbital and Physical Properties, and Exozodi Upper Limits Open
We report on coronagraphic observations of the nearest solar-type star, α Centauri A ( α Cen A), using the MIRI instrument on the James Webb Space Telescope. The proximity of α Cen (1.33 pc) means that the star’s habitable zone is spatiall…
View article: Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of <i>α</i> Centauri A. II. Binary Star Modeling, Planet and Exozodi Search, and Sensitivity Analysis
Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of <i>α</i> Centauri A. II. Binary Star Modeling, Planet and Exozodi Search, and Sensitivity Analysis Open
The James Webb Space Telescope (JWST) observed our closest solar twin, α Centauri A ( α Cen A), with the Mid-Infrared Instrument in the F1550C (15.5 μ m) coronagraphic imaging mode at three distinct epochs between 2024 August and 2025 Apri…
View article: Discovery of Volatile Gas in the Giant Impact Disk Around the 150 Myr Old HD 23514
Discovery of Volatile Gas in the Giant Impact Disk Around the 150 Myr Old HD 23514 Open
We report the discovery of CO 2 gas emission around HD 23514, an F5V star in the ∼150 Myr old Pleiades cluster, hosting one of the rare giant-impact disks with unique mineralogy dominated by silica dust. We show that the dust feature remai…
View article: The HOSTS survey: Suspected variable dust emission and constraints on companions around <i>θ</i> Boo
The HOSTS survey: Suspected variable dust emission and constraints on companions around <i>θ</i> Boo Open
Context . During the Hunt for Observable Signatures of Terrestrial Systems (HOSTS) survey by the Large Binocular Telescope Interferometer (LBTI), an excess emission from the main-sequence star, θ Boo (F7V spectral type, 14.5 pc distance) w…
View article: A Preliminary Search for Planets and Exozodiacal Emission Around <i>α</i> Centauri A with JWST/MIRI
A Preliminary Search for Planets and Exozodiacal Emission Around <i>α</i> Centauri A with JWST/MIRI Open
We present F1550C (15.5 μ m) coronagraphic imaging observations of the nearest solar-type star α Cen A using the James Webb Space Telescope (JWST) Mid-InfraRed Instrument (MIRI). The observations, executed in 2025 February, were compromise…
View article: WISE 12 μm search for exozodi candidates within 10 parsecs
WISE 12 μm search for exozodi candidates within 10 parsecs Open
Context . The discovery of extra-terrestrial life is one of the ultimate goals for future exoplanet-seeking missions. One of the major challenges these missions face is the possible presence of warm dust, referred to as ‘exozodiacal’ dust,…
View article: A PR drag origin for the Fomalhaut disc’s pervasive inner dust: constraints on collisional strengths, icy composition, and embedded planets
A PR drag origin for the Fomalhaut disc’s pervasive inner dust: constraints on collisional strengths, icy composition, and embedded planets Open
Recent JWST observations of the Fomalhaut debris disc have revealed a significant abundance of dust interior to the outer planetesimal belt, raising questions about its origin and maintenance. In this study, we apply an analytical model to…
View article: Exozodiacal dust as a limitation to exoplanet imaging and spectroscopy
Exozodiacal dust as a limitation to exoplanet imaging and spectroscopy Open
In addition to planets and other small bodies, stellar systems will likely also host exozodiacal dust, or exozodi. This warm dust primarily resides in or near the habitable zone of a star, and scatters stellar light in visible to NIR wavel…
View article: Subtle and Spectacular: Diverse White Dwarf Debris Disks Revealed by JWST
Subtle and Spectacular: Diverse White Dwarf Debris Disks Revealed by JWST Open
This Letter reports 12 novel spectroscopic detections of warm circumstellar dust orbiting polluted white dwarfs using the JWST Mid-Infrared Instrument (MIRI). The disks span 2 orders of magnitude in fractional infrared brightness and more …
View article: Recovering the structure of debris discs non-parametrically from images
Recovering the structure of debris discs non-parametrically from images Open
Debris discs common around Sun-like stars carry dynamical imprints in their structure that are key to understanding the formation and evolution history of planetary systems. In this paper, we extend an algorithm (rave) originally developed…
View article: Debris disks around M dwarfs: The <i>Herschel</i> DEBRIS survey
Debris disks around M dwarfs: The <i>Herschel</i> DEBRIS survey Open
The Herschel open-time key program Disc Emission via a Bias-free Reconnaissance in the Infrared and Sub-millimeter (DEBRIS) is an unbiased survey of the nearest ∼100 stars for each stellar type A-M observed with a uniform photometric sensi…
View article: A JWST MIRI MRS View of the η Tel Debris Disk and Its Brown Dwarf Companion
A JWST MIRI MRS View of the η Tel Debris Disk and Its Brown Dwarf Companion Open
We report JWST Mid-Infrared Instrument (MIRI) Medium Resolution Spectrograph (MRS) observations of the β Pic moving-group member, η Tel A, along with its brown dwarf binary companion, η Tel B. Following point-spread-function subtraction, w…
View article: A JWST MIRI MRS View of the η Tel Debris Disk and Its Brown Dwarf Companion
A JWST MIRI MRS View of the η Tel Debris Disk and Its Brown Dwarf Companion Open
We report JWST Mid-Infrared Instrument (MIRI) Medium Resolution Spectrograph (MRS) observations of the β Pic moving-group member, η Tel A, along with its brown dwarf binary companion, η Tel B. Following point-spread-function subtraction, w…
View article: REsolved ALMA and SMA Observations of Nearby Stars (REASONS)
REsolved ALMA and SMA Observations of Nearby Stars (REASONS) Open
Context . Planetesimal belts are ubiquitous around nearby stars, and their spatial properties hold crucial information for planetesimal and planet formation models. Aims . We present resolved dust observations of 74 planetary systems as pa…
View article: Collisional damping in debris discs: Only significant if collision velocities are low
Collisional damping in debris discs: Only significant if collision velocities are low Open
Context . Dusty debris discs around main sequence stars are observed to vary widely in terms of their vertical thickness. Their vertical structure may be affected by damping in inelastic collisions. Although kinetic models have often been …
View article: A Search for Collisions and Planet–Disk Interactions in the Beta Pictoris Disk with 26 Years of High-precision HST/STIS Imaging
A Search for Collisions and Planet–Disk Interactions in the Beta Pictoris Disk with 26 Years of High-precision HST/STIS Imaging Open
β Pictoris's well-studied debris disk and two known giant planets, in combination with the stability of the Hubble Space Telescope’s Space Telescope Imaging Spectrograph (HST/STIS) (and now also JWST), offers a unique opportunity to test p…
View article: Database of Candidate Targets for the LIFE Mission
Database of Candidate Targets for the LIFE Mission Open
We present the database of potential targets for the Large Interferometer For Exoplanets (LIFE), a space-based mid-infrared nulling interferometer mission proposed for the Voyage 2050 science program of the European Space Agency. The datab…
View article: A JWST MIRI MRS View of the $η$ Tel Debris Disk and its Brown Dwarf Companion
A JWST MIRI MRS View of the $η$ Tel Debris Disk and its Brown Dwarf Companion Open
We report JWST MIRI MRS observations of the $β$ Pictoris moving group member, $η$ Telescopii ($η$ Tel) A and its brown dwarf binary companion, $η$ Tel B. Following PSF subtraction, we recover the spatially resolved flux from the debris dis…
View article: FitteR for Accretion ProPErties of T Tauri stars (FRAPPE): A new approach to use class III spectra to derive stellar and accretion properties
FitteR for Accretion ProPErties of T Tauri stars (FRAPPE): A new approach to use class III spectra to derive stellar and accretion properties Open
Context. Studies of the stellar and accretion properties of classical T Tauri stars (CTTS) require photospheric spectral templates to be compared with. The use of low-activity, slowly rotating field dwarfs or model spectra can be advantage…
View article: FitteR for Accretion ProPErties of T Tauri stars (FRAPPE): A new approach to use Class III spectra to derive stellar and accretion properties
FitteR for Accretion ProPErties of T Tauri stars (FRAPPE): A new approach to use Class III spectra to derive stellar and accretion properties Open
Studies of the stellar and accretion properties of classical T Tauri stars (CTTS) require comparison with photospheric spectral templates. Here we aim at expanding the currently available grid of wide-wavelength coverage observed spectra o…
View article: Data from A Search for Collisions and Planet-Disk Interactions in the Beta Pictoris Disk with 26 Years of High Precision HST/STIS Imaging
Data from A Search for Collisions and Planet-Disk Interactions in the Beta Pictoris Disk with 26 Years of High Precision HST/STIS Imaging Open
Beta Pictoris (Beta Pic)'s well-studied debris disk and two known giant\nplanets, in combination with the stability of HST/STIS (and now also JWST),\noffers a unique opportunity to test planet-disk interaction models and to\nobserve recent…
View article: First ALMA observations of the HD 105211 debris disc: A warm dust component close to a gigayear-old star
First ALMA observations of the HD 105211 debris disc: A warm dust component close to a gigayear-old star Open
Most debris discs consist of a gas-poor, cold dust belt located tens to hundreds of astronomical units away from the host star. Many cold dust belts exhibit distinct structures attributed to the dynamic interaction of planetary systems. Mo…