A5093511560- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Space Exploration and Technology
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- High-pressure geophysics and materials
University of Birmingham
2023-2025
Abstract Accurate limb-darkening models are needed for accurate characterisation of eclipsing binary stars and transiting exoplanets from the analysis their light curves. The observed in solar-type curves hot-Jupiter systematically less steep than predicted by stellar model atmospheres that do not account magnetic field. Hot-Jupiter host tend to be metal rich ([Fe/H] ≈ 0.25) leading a lack low- solar-metallicity targets previous studies, so we have analysed TESS sample 19 with M-dwarf...
We present an exhaustive photometric and spectroscopic analysis of TOI-837, a F9/G0 35 Myr young star, hosting transiting exoplanet, TOI-837b, with orbital period 8.32d. Utilising data from TESS ground-based observations, we determine planetary radius 0.82 R_J for TOI-837b. Through detailed HARPS time series analysis, derive Doppler semi-amplitude m/s, corresponding to mass 0.39 M_J. The derived properties suggest substantial core approximately 70 M_E, constituting about 60% the planet's...
ABSTRACT In the hunt for Earth-like exoplanets, it is crucial to have reliable host star parameters, as they a direct impact on accuracy and precision of inferred parameters any discovered exoplanet. For stars with masses between 0.35 0.5 M⊙, an unexplained radius inflation observed relative typical stellar models. However, fully convective objects mass below not known whether this present, there are fewer accurate measurements in regime. Low-mass eclipsing binaries present unique...
ABSTRACT Planets orbiting binary systems are relatively unexplored compared to those around single stars. Detections of circumbinary planets and planetary offer a first detailed view into our understanding planet formation dynamical evolution. The BEBOP (binaries escorted by planets) radial velocity survey plays special role in this adventure as it focuses on eclipsing single-lined binaries with an FGK dwarf primary M secondary allowing for the highest precision using HARPS SOPHIE...
ABSTRACT We present an exhaustive photometric and spectroscopic analysis of TOI-837, a F9/G0 35 Myr young star, hosting transiting exoplanet, TOI-837 b, with orbital period ∼8.32 d. Utilizing data from the Transiting Exoplanet Survey Satellite ground-based observations, we determine planetary radius $0.818_{-0.024}^{+0.034}$ RJ for b. Through detailed High Accuracy Radial Velocity Planet Searcher time series analysis, derive Doppler semi-amplitude $34.7_{-5.6}^{+5.3}$ ${\rm m\, s^{-1}}$,...
Planets orbiting binary systems are relatively unexplored compared to those around single stars. Detections of circumbinary planets and planetary offer a first detailed view into our understanding planet formation dynamical evolution. The BEBOP (Binaries Escorted by Orbiting Planets) radial velocity survey plays special role in this adventure as it focuses on eclipsing single-lined binaries with an FGK dwarf primary M secondary allowing for the highest-radial precision using HARPS SOPHIE...
ABSTRACT We report on the detailed characterization of K2-370 b, a transiting sub-Neptune 2.14-d orbit around chromospherically active G-type dwarf HD 284521 ($T_\mathrm{eff} = 5662\pm 44$ K, $\lt \log R^\prime _{\rm HK}\gt =-4.49$). The system parameters are derived based global fit to K2, TESS and CHEOPS photometry, HARPS-N HARPS radial velocities (RVs). A Gaussian process regression analysis is performed simultaneously orbital RVs effectively model strong stellar rotation signal with...
ABSTRACT Despite being the most common types of stars in Galaxy, physical properties late M dwarfs are often poorly constrained. A trend radius inflation compared to evolutionary models has been observed for earlier type eclipsing binaries, possibly caused by magnetic activity. It is currently unclear whether this also extends later below convective boundary. This makes discovery lower mass, fully convective, binaries valuable testing – especially longer-period where tidal interaction...
In the hunt for Earth-like exoplanets it is crucial to have reliable host star parameters, as they a direct impact on accuracy and precision of inferred parameters any discovered exoplanet. For stars with masses between 0.35 0.5 ${\rm M_{\odot}}$ an unexplained radius inflation observed relative typical stellar models. However, fully convective objects mass below not known whether this present there are fewer accurate measurements in regime. Low-mass eclipsing binaries unique opportunity...