M. J. Hooton
A5061638778- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Adaptive optics and wavefront sensing
- History and Developments in Astronomy
- Space Exploration and Technology
- Planetary Science and Exploration
- Astronomical and nuclear sciences
- Scientific Research and Discoveries
- Renaissance Literature and Culture
- Nuclear reactor physics and engineering
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Infrared Target Detection Methodologies
- Laser-Matter Interactions and Applications
- Astrophysical Phenomena and Observations
- CCD and CMOS Imaging Sensors
- Marine and environmental studies
- SAS software applications and methods
Cavendish Hospital
2022-2024
University of Bern
2020-2023
University of Cambridge
2022-2023
International Space Science Institute
2022
Queen's University Belfast
2018-2020
Determining the architecture of multi-planetary systems is one cornerstones understanding planet formation and evolution. Resonant are especially important as fragility their orbital configuration ensures that no significant scattering or collisional event has taken place since earliest phase when parent protoplanetary disc was still present. In this context, TOI-178 been subject particular attention first TESS observations hinted at a 2:3:3 resonant chain. Here we report results from...
Thermal inversions have long been predicted to exist in the atmospheres of ultra-hot Jupiters. However, detection two species thought be responsible -- TiO and VO remain elusive. We present a search for atmosphere Jupiter WASP-121b ($T_\textrm{eq} \gtrsim 2400$ K), an exoplanet already known show water features its dayside spectrum characteristic temperature inversion as well tentative evidence at low-resolution. observed transmission with UVES/VLT used cross-correlation method powerful tool...
We report the discovery and characterisation of a pair sub-Neptunes transiting bright K-dwarf TOI-1064 (TIC 79748331), initially detected in TESS photometry. To characterise system, we performed retrieved CHEOPS, TESS, ground-based photometry, HARPS high-resolution spectroscopy, Gemini speckle imaging. host star determine $T_{\rm eff, \star}=4734\pm67$ K, $R_{\star}=0.726\pm0.007$ $R_{\odot}$, $M_{\star}=0.748\pm0.032$ $M_{\odot}$. present novel detrending method based on PSF shape-change...
Gas giants orbiting close to hot and massive early-type stars can reach dayside temperatures that are comparable those of the coldest stars. These "ultra-hot Jupiters" have atmospheres made ions atomic species from molecular dissociation feature strong day-to-night temperature gradients. Photometric observations at different orbital phases provide insights on planet atmospheric properties. We analyse photometric WASP-189 acquired with instrument CHEOPS derive constraints system architecture...
Context. In the age of JWST, temperate terrestrial exoplanets transiting nearby late-type M dwarfs provide unique opportunities for characterising their atmospheres, as well searching biosignature gases. this context, benchmark TRAPPIST-1 planetary system has garnered interest a broad scientific community. Aims. We report here discovery and validation two super-Earths LP 890-9 (TOI-4306, SPECULOOS-2), relatively low-activity (32 pc) M6V star. The inner planet, b, was first detected by TESS...
The detection of a super-Earth and three mini-Neptunes transiting the bright ($V$ = 9.2 mag) star HD 108236 (also known as TOI-1233) was recently reported on basis TESS ground-based light curves. We perform first characterisation planetary system through high-precision CHEOPS photometry improve transit ephemerides parameters. characterise host spectroscopic analysis derive radius with infrared flux method. constrain stellar mass age by combining results obtained from two sets evolutionary...
Ultra-hot Jupiters (UHJs) present excellent targets for atmospheric characterisation. Their hot dayside temperatures (T $\gtrsim$ 2200 K) strongly suppress the formation of condensates, leading to clear and highly-inflated atmospheres extremely conducive transmission spectroscopy. Recent studies using optical high-resolution spectra have discovered a plethora neutral ionised atomic species in UHJs, placing constraints on their structure composition. Our recent work has presented search...
Context: TOI-2076 is a transiting three-planet system of sub-Neptunes orbiting bright (G = 8.9 mag), young ($340\pm80$ Myr) K-type star. Although validated planetary system, the orbits two outer planets were unconstrained as only non-consecutive transits seen in TESS photometry. This left 11 and 7 possible period aliases for each. Aims: To reveal true these long-period planets, precise photometry targeted on highest-probability required. Long-term monitoring multi-planet systems can also...
Abstract The Kepler and TESS missions have demonstrated that planets are ubiquitous. However, the success of these heavily depends on ground-based radial velocity (RV) surveys, which combined with transit photometry can yield bulk densities orbital properties. While most host stars too faint for detailed follow-up observations, is detecting orbiting nearby bright more amenable to RV characterization. Here, we introduce TESS-Keck Survey (TKS), an program using ∼100 nights Keck/HIRES study...
We present a precise characterization of the TOI-561 planetary system obtained by combining previously published data with TESS and CHEOPS photometry, new set $62$ HARPS-N radial velocities (RVs). Our joint analysis confirms presence four transiting planets, namely b ($P = 0.45$ d, $R 1.42$ R$_\oplus$, $M 2.0$ M$_\oplus$), c 10.78$ 2.91$ 5.4$ d 25.7$ 2.82$ 13.2$ M$_\oplus$) e 77$ 2.55$ 12.6$ M$_\oplus$). Moreover, we identify an additional, long-period signal ($>450$ d) in RVs, which...
ABSTRACT HIP 9618 (HD 12572, TOI-1471, TIC 306263608) is a bright (G = 9.0 mag) solar analogue. TESS photometry revealed the star to have two candidate planets with radii of 3.9 ± 0.044 R⊕ (HIP b) and 3.343 0.039 c). While 20.77291 d period b was measured unambiguously, c showed only transits separated by 680-d gap in time series, leaving many possibilities for period. To solve this issue, CHEOPS performed targeted aliases attempt recover true planet c, successfully determined be 52.56349 d....
Context. M-dwarf stars are the most common of potential exoplanet host in Galaxy. It is therefore very important to understand planetary systems orbiting such and determine physical parameters planets with high precision. Also launch James Webb Space Telescope (JWST) observation atmospheric these has begun. required properties targets. Aims. Two around red dwarf TOI-776 were detected by TESS. The objective our study was use transit observations obtained CHEOPS space mission improve current...
WASP-103b is the exoplanet with highest expected deformation signature in its transit light curve and one of shortest spiral-in times. Measuring tidal planet would allow us to estimate second degree fluid Love number gain insight into planet's internal structure. Moreover, measuring decay timescale stellar quality factor, which key constraining physics. We obtained 12 curves CHEOPS this extreme system. modelled high-precision together systematic instrumental noise using multi-dimensional...
The light curves of tidally locked hot Jupiters transiting fast-rotating, early-type stars are a rich source information about both the planet and star, with full-phase coverage enabling detailed atmospheric characterisation planet. Although it is possible to determine true spin-orbit angle $\Psi$, notoriously difficult parameter measure, from any transit asymmetry resulting gravity darkening induced by stellar rotation, correlations that exist between parameters have led large disagreements...
Several planetary formation models have been proposed to explain the observed abundance and variety of compositions super-Earths mini-Neptunes. In this context, multitransiting systems orbiting low-mass stars whose planets are close radius valley benchmark systems, which help elucidate model dominates. We report discovery, validation, initial characterization one such system, TOI-2096, composed a super-Earth mini-Neptune hosted by mid-type M dwarf located 48 pc away. first characterized host...
Context . TOI-732 is an M dwarf hosting two transiting planets that are located on the opposite sides of radius valley. Inferring a reliable demographics for this type systems key to understanding their formation and evolution mechanisms. Aims By doubling number available space-based observations increasing radial velocity (RV) measurements, we aim at refining parameters b c. We also use results study slope valley density well-characterised sample M-dwarf exoplanets. Methods performed global...
We present the discovery of two exoplanets transiting TOI-836 (TIC 440887364) using data from TESS Sector 11 and 38. is a bright ($T = 8.5$ mag), high proper motion ($\sim\,200$ mas yr$^{-1}$), low metallicity ([Fe/H]$\approx\,-0.28$) K-dwarf with mass $0.68\pm0.05$ M$_{\odot}$ radius $0.67\pm0.01$ R$_{\odot}$. obtain photometric follow-up observations variety facilities, we use these data-sets to determine that inner planet, b, $1.70\pm0.07$ R$_{\oplus}$ super-Earth in 3.82 day orbit,...
In the last decade, a dozen close-in giant planets have been discovered orbiting stars with spectral types ranging from M0 to M4, mystery since known formation pathways do not predict existence of such systems. Here, we confirm TOI-4860 b, Jupiter-sized planet an M4.5 host, star at transition between fully and partially convective interiors. First identified TESS data, validate transiting companion's planetary nature through multicolour photometry TRAPPIST-South/North, SPECULOOS, MuSCAT3...
We report on the confirmation and follow-up characterization of two long-period transiting substellar companions low-eccentricity orbits around TIC 4672985 TOI-2529, whose transit events were detected by TESS space mission. Ground-based photometric spectroscopic from different facilities, confirmed nature b , a massive gas giant in transition between super-Jupiters brown dwarfs mass regime. From joint analysis we derived following orbital parameters: P = 69.0480 −0.0005 +0.0004 d, M p 12.74...
Multiplanetary systems spanning the radius valley are ideal testing grounds for exploring different proposed explanations observed bimodality in distribution of close-in exoplanets. One such system is HIP 29442 (TOI-469), an evolved K0V star hosting two super-Earths and one sub-Neptune. We with CHEOPS a total 9.6 days, which we modelled jointly sectors TESS data to derive planetary radii 3.410 ± 0.046, 1.551 0.045, 1.538 0.049 R ⊕ planets b, c, d, orbit periods 13.6, 3.5, 6.4 respectively....
Context. Tidal orbital decay is suspected to occur for hot Jupiters in particular, with the only observationally confirmed case of this being WASP-12b. By examining effect, information on properties host star can be obtained using so-called stellar modified tidal quality factor Q * ′ , which describes efficiency kinetic energy planet dissipated within star. This provide about interior Aims. In study, we aim improve constraints KELT-9, KELT-16, and WASP-4 systems order find evidence or...