K. L. Chubb
A5050228904- Nuclear Physics and Applications
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Geomagnetism and Paleomagnetism Studies
- Stellar, planetary, and galactic studies
- Spectroscopy and Laser Applications
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Advanced NMR Techniques and Applications
- Molecular Spectroscopy and Structure
- Calibration and Measurement Techniques
- Astronomy and Astrophysical Research
- Methane Hydrates and Related Phenomena
- Medical Imaging Techniques and Applications
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Geochemistry and Geologic Mapping
- Gamma-ray bursts and supernovae
- Inorganic Fluorides and Related Compounds
- Particle Detector Development and Performance
- Solid-state spectroscopy and crystallography
- Spectroscopy Techniques in Biomedical and Chemical Research
- Spacecraft and Cryogenic Technologies
- Quantum, superfluid, helium dynamics
- Advanced Chemical Physics Studies
SRON Netherlands Institute for Space Research
2016-2024
University College London
2016-2024
University of St Andrews
2021-2024
Austrian Academy of Sciences
2023-2024
Space Research Institute
2023-2024
University of Bristol
2024
Bristol Robotics Laboratory
2024
Aarhus University
2021-2022
University of Wuppertal
2018
Deutsches Elektronen-Synchrotron DESY
2018
Transmission spectroscopy1-3 of exoplanets has revealed signatures water vapour, aerosols and alkali metals in a few dozen exoplanet atmospheres4,5. However, these previous inferences with the Hubble Spitzer Space Telescopes were hindered by observations' relatively narrow wavelength range spectral resolving power, which precluded unambiguous identification other chemical species-in particular primary carbon-bearing molecules6,7. Here we report broad-wavelength 0.5-5.5 µm atmospheric...
Measuring the abundances of carbon and oxygen in exoplanet atmospheres is considered a crucial avenue for unlocking formation evolution exoplanetary systems. Access to an exoplanet's chemical inventory requires high-precision observations, often inferred from individual molecular detections with low-resolution space-based high-resolution ground-based facilities. Here we report medium-resolution (R$\sim$600) transmission spectrum atmosphere between 3-5 $\mu$m covering multiple absorption...
Transmission spectroscopy provides insight into the atmospheric properties and consequently formation history, physics, chemistry of transiting exoplanets. However, obtaining precise inferences from transmission spectra requires simultaneously measuring strength shape multiple spectral absorption features a wide range chemical species. This has been challenging given precision wavelength coverage previous observatories. Here, we present spectrum Saturn-mass exoplanet WASP-39b obtained using...
Abstract Carbon dioxide (CO 2 ) is a key chemical species that found in wide range of planetary atmospheres. In the context exoplanets, CO an indicator metal enrichment (that is, elements heavier than helium, also called ‘metallicity’) 1–3 , and thus formation processes primary atmospheres hot gas giants 4–6 . It one most promising to detect secondary terrestrial exoplanets 7–9 Previous photometric measurements transiting planets with Spitzer Space Telescope have given hints presence but not...
Photochemistry is a fundamental process of planetary atmospheres that regulates the atmospheric composition and stability. However, no unambiguous photochemical products have been detected in exoplanet to date. Recent observations from JWST Transiting Exoplanet Early Release Science Program found spectral absorption feature at 4.05 $\mu$m arising SO$_2$ atmosphere WASP-39b. WASP-39b 1.27-Jupiter-radii, Saturn-mass (0.28 M$_J$) gas giant orbiting Sun-like star with an equilibrium temperature...
Abstract Measuring the metallicity and carbon-to-oxygen (C/O) ratio in exoplanet atmospheres is a fundamental step towards constraining dominant chemical processes at work and, if equilibrium, revealing planet formation histories. Transmission spectroscopy (for example, refs. 1,2 ) provides necessary means by abundances of oxygen- carbon-bearing species; however, this requires broad wavelength coverage, moderate spectral resolution high precision, which, together, are not achievable with...
The recent inference of sulfur dioxide (SO2) in the atmosphere hot (approximately 1,100 K), Saturn-mass exoplanet WASP-39b from near-infrared JWST observations1-3 suggests that photochemistry is a key process high-temperature atmospheres4. This because low (<1 ppb) abundance SO2 under thermochemical equilibrium compared with produced H2O and H2S (1-10 ppm)4-9. However, was made single, small molecular feature transmission spectrum at 4.05 μm and, therefore, detection other absorption bands...
Abstract Hot Jupiters are among the best-studied exoplanets, but it is still poorly understood how their chemical composition and cloud properties vary with longitude. Theoretical models predict that clouds may condense on nightside molecular abundances can be driven out of equilibrium by zonal winds. Here we report a phase-resolved emission spectrum hot Jupiter WASP-43b measured from 5 μm to 12 JWST’s Mid-Infrared Instrument. The spectra reveal large day–night temperature contrast (with...
The ExoMol database (www.exomol.com) provides molecular data for spectroscopic studies of hot atmospheres. These are widely used to model atmospheres exoplanets, cool stars and other astronomical objects, as well a variety terrestrial applications. 2024 release reports the current status which contains recommended line lists 91 molecules 224 isotopologues giving total almost 1012 individual transitions. New features include extensive "MARVELization" allow them be high resolutions studies,...
Here we present a publicly available database of opacities for molecules astrophysical interest named ExoMolOP that has been compiled over 80 species, and is based on the latest line list data from ExoMol, HITEMP, MoLLIST databases. These are generally suitable characterising high-temperature exoplanet or cool stellar substellar atmospheres, have computed at variety pressures temperatures, with few included room temperature only HITRAN database. The formatted in different ways four...
Reliable models of the thermally pulsing asymptotic giant branch (TP-AGB) phase are critical importance across astrophysics, including our interpretation spectral energy distribution galaxies, cosmic dust production, and enrichment interstellar medium. With aim improving sets stellar isochrones that include a detailed description TP-AGB phase, we extend recent calibration AGB population in Small Magellanic Cloud (SMC) to more metal rich Large (LMC). We model LMC populations with TRILEGAL...
A new ro-vibrational line list for the ground electronic state of main isotopologue acetylene, $^{12}$C$_2$H$_2$, is computed as part ExoMol project. The aCeTY covers transition wavenumbers up to 10,000 cm$^{-1}$ ($ \lambda >1$ $\mu$m), with lower and upper energy levels 12,000 22,000 considered, respectively. calculations are performed a maximum value vibrational angular momentum, $K_{\rm max}=L_{\rm max}$ = 16, rotational $J$ 99. Higher values were not within specified wavenumber window....
Aims: ARCiS, a novel code for the analysis of exoplanet transmission and emission spectra is presented. The aim modelling framework to provide tool able link observations physical models atmospheres. Methods: philosophy chosen in this paper use chemical constrain certain parameters while keeping free parts where our understanding still more limited. This approach, between full parameterisation, allows us processes we understand well parameterise those less understood. A Bayesian retrieval...
ABSTRACT Retrieval methods are a powerful analysis technique for modelling exoplanetary atmospheres by estimating the bulk physical and chemical properties that combine in forward model to best fit an observed spectrum, they increasingly being applied observations of directly imaged exoplanets. We have adapted taurex3, Bayesian retrieval suite, near-infrared spectrophotometry from gas giant exoplanets brown dwarfs. demonstrate taurex3’s applicability sub-stellar presenting results dwarf...
ABSTRACT The goal of this white paper is to provide a snapshot the data availability and needs primarily for Ariel space mission, but also related atmospheric studies exoplanets cool stars. It covers following data-related topics: molecular atomic line lists, profiles, computed cross-sections opacities, collision-induced absorption other continuum data, optical properties aerosols surfaces, chemistry, UV photodissociation photoabsorption cross-sections, standards in description format such...
The study of exoplanetary atmospheres relies on detecting minute changes in the transit depth at different wavelengths. To date, a number ground and space based instruments have been used to obtain transmission spectra exoplanets spectral band. One common practice is combine observations from order achieve broader wavelength coverage. We present here two inconsistent WASP-96 b, one by Hubble Space Telescope (HST) other Very Large (VLT). key findings our investigation: 1.) strong water...
Aims. To create a retrieval framework which encapsulates the 3D nature of exoplanet atmospheres, and to apply it observed emission phase curve transmission spectra hot Jupiter WASP-43b. Methods. We present our framework, is freely available as stand-alone module from GitHub. use atmospheric modelling Bayesian package ARCiS (ARtful Code for Science) perform 8 retrievals on simultaneous (HST/WFC3) phase-dependent (HST/WFC3, Spitzer/IRAC) observations WASP-43b case study. assess how input...
Rotation-vibration energy levels are determined for the electronic ground state of acetylene molecule, 12C2H2, using Measured Active Rotational-Vibrational Energy Levels (Marvel) technique. 37,813 measured transitions from 61 publications considered. The distinct components spectroscopic network linking ortho and para states molecule considered separately. 20,717 17,096 experimentally used to determine 6013 5200 levels. Marvel results compared with alternative compilations based on use...
Having a short orbital period and being tidally locked makes WASP-43b an ideal candidate for JWST observations. Phase curve observations of entire orbit will enable the mapping atmospheric structure across planet, with different wavelengths observation allowing depths to be seen. We provide insight into details clouds that may form on in order prepare forthcoming interpretation follow-up data. utilize 3D GCM results as input kinetic, non-equilibrium model mineral cloud particles, kinetic...
Planets smaller than Neptune and larger Earth make up the majority of discovered exoplanets. Those with H$_2$-rich atmospheres are prime targets for atmospheric characterization. The transition between two main classes, super-Earths sub-Neptunes, is not clearly understood as rocky surface likely accessible to observations. Tracking several trace gases (specifically loss ammonia (NH$_3$) hydrogen cyanide (HCN)) has been proposed a proxy presence shallow surface. In this work, we revisit...