A5025379319- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Scientific Research and Discoveries
- Planetary Science and Exploration
- Greenhouse Technology and Climate Control
- Chemical and Environmental Engineering Research
- Accounting Theory and Financial Reporting
- History and Developments in Astronomy
- Space Exploration and Technology
- Molecular Spectroscopy and Structure
- Wireless Sensor Networks for Data Analysis
Met Office
2021-2022
University of Exeter
2018-2021
University of Bristol
2014-2016
The James Webb Space Telescope (JWST) presents the opportunity to transform our understanding of planets and origins life by revealing atmospheric compositions, structures, dynamics transiting exoplanets in unprecedented detail. However, high-precision, timeseries observations required for such investigations have unique technical challenges, prior experience with Hubble, Spitzer, other facilities indicates that there will be a steep learning curve when JWST becomes operational. In this...
To understand and compare the 3D atmospheric structure of HD 209458 b 189733 b, focusing on formation distribution cloud particles, as well their feedback dynamics thermal profile. We couple Met Office Unified Model (UM), including detailed treatments radiative transfer dynamics, to a kinetic scheme. The resulting model self--consistently solves for condensation seeds, surface growth evaporation, gravitational settling advection, via absorption and, crucially, scattering. Fluxes directly...
We present high resolution transmission spectra, calculated directly from a 3D radiative-hydrodynamics simulation that includes kinetic cloud formation, for HD209458b. find the opacity of our vertically extensive deck, composed large number density sub-micron particles, flattens spectrum and obscures spectral features identified in observed data. use PandExo simulator to explore HD209458b which may be detectable with James Webb Space Telescope (JWST). determine an 8 - 12 micron absorption...
ABSTRACT We present results from 3D radiative-hydrodynamical simulations of HD 209458b with a fully coupled treatment clouds using the EddySed code, critically, including cloud radiative feedback via absorption and scattering. demonstrate that thermal optical structure simulated atmosphere is markedly different, for majority our simulations, when effects, suggesting this important mechanism cannot be neglected. Additionally, we further sensitive to not only sedimentation efficiency (termed...
Observations of circumbinary planets orbiting very close to the central stars have shown that planet formation may occur in a hostile environment, where gravitational pull from binary should be strong on primordial protoplanetary disk. Elevated impact velocities and orbit crossings eccentricity oscillations are primary contributors high energy, potentially destructive collisions inhibit growth aspiring planets. In this work, we conduct high-resolution, inter-particle gravity enabled N-body...
We present results of 3D hydrodynamical simulations HD209458b including a coupled, radiatively-active cloud model ({\sc EddySed}). investigate the role mixing by replacing default convective treatment used in previous works with more physically relevant ($K_{zz}$) based on global circulation. find that uncertainty efficiency sedimentation through factor $f_\mathrm{sed}$ plays larger shaping thickness and its radiative feedback local gas temperatures -- e.g. hot spot shift day-to-night side...
The intermediate phases of planet formation are not directly observable due to lack emission from planetesimals. Planet is, however, a dynamically active process resulting in collisions between the evolving planetesimals and production dust. Thus, indirect observation may indeed be possible near future. In this paper we present synthetic observations based on numerical N-body simulations phase including state-of-the-art collision model, EDACM, which allows multiple outcomes, such as,...
Context. The Kepler mission's discovery of a number circumbinary planets orbiting close (ap< 1.1 au) to the stellar binary raises questions as how these could have formed given intense gravitational perturbations dual stars impart on disk. gas component protoplanetary disks is perturbed in similar manner solid, planetesimal dominated counterpart, although mechanism by which disk eccentricity originates differs.
ABSTRACT We investigate the impact of clouds on atmosphere GJ 1214b using radiatively coupled, phase-equilibrium cloud model EddySed coupled to Unified Model general circulation model. find that, consistent with previous investigations, high metallicity (100 × solar) and large vertical extents (a sedimentation factor fsed = 0.1) are required best match observations, although metallicities even higher than those investigated here may be improve agreement further. additionally that in our case...
Aims. We investigate the feasibility of planetesimal growth in circumbinary protoplanetary disks around observed systems Kepler- 16 and Kepler-34 under gravitational influence a precessing eccentric gas disk. Methods. embed results our previous hydrodynamical simulations binaries into an N-body code to perform 3D, high-resolution, inter-particle gravity-enabled dynamics that include force imparted by gas. Results. Including full, asymmetric disk generates high eccentricity orbits for...
ABSTRACT Observations of the youngest planets (∼1–10 Myr for a transitional disk) will increase accuracy our planet formation models. Unfortunately, observations such are challenging and time-consuming to undertake, even in ideal circumstances. Therefore, we propose determination set markers that can preselect promising exoplanet-hosting candidate disks. To this end, N -body simulations were conducted investigate effect an embedded Jupiter-mass on dynamics surrounding planetesimal disk...