All Outputs (206)

The EBLM project – XIII. The absolute dynamical masses of the circumbinary planet host TOI-1338/BEBOP-1, and applications to the study of exoplanet atmospheres. (2024)
Journal Article

High-contrast eclipsing binaries with low mass M-dwarf secondaries are precise benchmark stars to build empirical mass-radius relationships for fully convective low-mass ($\rm M_{\star } < 0.35\, M_{\odot }$) dwarf stars. The contributed light... Read More about The EBLM project – XIII. The absolute dynamical masses of the circumbinary planet host TOI-1338/BEBOP-1, and applications to the study of exoplanet atmospheres..

The EBLM Project XII. An eccentric, long-period eclipsing binary with a companion near the hydrogen-burning limit (2024)
Journal Article

In the hunt for Earth-like exoplanets it is crucial to have reliable host star parameters, as they have a direct impact on the accuracy and precision of the inferred parameters for any discovered exoplanet. For stars with masses between 0.35 and 0.5... Read More about The EBLM Project XII. An eccentric, long-period eclipsing binary with a companion near the hydrogen-burning limit.

The EBLM Project– XI. Mass, radius, and effective temperature measurements for 23 M-dwarf companions to solar-type stars observed with <i>CHEOPS</i> (2024)
Journal Article

Observations of low-mass stars have frequently shown a disagreement between observed stellar radii and radii predicted by theoretical stellar structure models. This ‘radius inflation’ problem could have an impact on both stellar and exoplanetary scie... Read More about The EBLM Project– XI. Mass, radius, and effective temperature measurements for 23 M-dwarf companions to solar-type stars observed with <i>CHEOPS</i>.

A resonant sextuplet of sub-Neptunes transiting the bright star HD 110067. (2023)
Journal Article

Planets with radii between that of the Earth and Neptune (hereafter referred to as 'sub-Neptunes') are found in close-in orbits around more than half of all Sun-like stars . However, their composition, formation and evolution remain poorly understood... Read More about A resonant sextuplet of sub-Neptunes transiting the bright star HD 110067..

The EBLM Project—From False Positives to Benchmark Stars and Circumbinary Exoplanets (2023)
Journal Article

The EBLM project aims to characterise very-low-mass stars that are companions to solar-type stars in eclipsing binaries. We describe the history and motivation for this project, the methodology we use to obtain the precise mass, radius, and effective... Read More about The EBLM Project—From False Positives to Benchmark Stars and Circumbinary Exoplanets.

CHEOPS and TESS view of the ultra-short-period super-Earth TOI-561 b (2023)
Journal Article

Context. Ultra-short-period planets (USPs) are a unique class of super-Earths with an orbital period of less than a day, and hence they are subject to intense radiation from their host star. These planets cannot retain a primordial H/He atmosphere, a... Read More about CHEOPS and TESS view of the ultra-short-period super-Earth TOI-561 b.

Refining the properties of the TOI-178 system with CHEOPS and TESS (2023)
Journal Article

Context. The TOI-178 system consists of a nearby late K-dwarf transited by six planets in the super-Earth to mini-Neptune regime, with radii ranging from ~1.1 to 2.9 R⊕ and orbital periods between 1.9 and 20.7 days. All planets but the innermost one... Read More about Refining the properties of the TOI-178 system with CHEOPS and TESS.

Radial-velocity discovery of a second planet in the TOI-1338/BEBOP-1 circumbinary system (2023)
Journal Article

TOI-5678b: A 48-day transiting Neptune-mass planet characterized with CHEOPS and HARPS (2023)
Journal Article

Context. A large sample of long-period giant planets has been discovered thanks to long-term radial velocity surveys, but only a few dozen of these planets have a precise radius measurement. Transiting gas giants are crucial targets for the study of... Read More about TOI-5678b: A 48-day transiting Neptune-mass planet characterized with CHEOPS and HARPS.

Refined parameters of the HD 22946 planetary system and the true orbital period of planet d (2023)
Journal Article

Context. Multi-planet systems are important sources of information regarding the evolution of planets. However, the long-period planets in these systems often escape detection. These objects in particular may retain more of their primordial character... Read More about Refined parameters of the HD 22946 planetary system and the true orbital period of planet d.

Fundamental effective temperature measurements for eclipsing binary stars – IV. Selection of new benchmark stars and first results for HD 22064 (2023)
Journal Article

I describe the selection and initial characterization of 20 eclipsing binary stars that are suitable for calibration and testing of stellar models and data analysis algorithms used by the PLATO mission and spectroscopic surveys. The binary stars sele... Read More about Fundamental effective temperature measurements for eclipsing binary stars – IV. Selection of new benchmark stars and first results for HD 22064.

Two warm Neptunes transiting HIP 9618 revealed by <i>TESS</i> and <i>Cheops</i> (2023)
Journal Article

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 9618 b) and 3.343 ± 0.039 R⊕ (HIP 9618 c). While the 20.77291 d p... Read More about Two warm Neptunes transiting HIP 9618 revealed by <i>TESS</i> and <i>Cheops</i>.

TESS and CHEOPS discover two warm sub-Neptunes transiting the bright K-dwarf HD 15906 (2023)
Journal Article

We report the discovery of two warm sub-Neptunes transiting the bright (G = 9.5 mag) K-dwarf HD 15906 (TOI 461, TIC 4646810). This star was observed by the Transiting Exoplanet Survey Satellite (TESS) in sectors 4 and 31, revealing two small transiti... Read More about TESS and CHEOPS discover two warm sub-Neptunes transiting the bright K-dwarf HD 15906.

A new dynamical modeling of the WASP-47 system with CHEOPS observations (2023)
Journal Article

The geometric albedo of the hot Jupiter HD 189733b measured with CHEOPS, (2023)
Journal Article

A full transit of nu(2) Lupi d and the search for an exomoon in its Hill sphere with CHEOPS (2023)
Journal Article

The planetary system around the naked-eye star v(2) Lupi (HD 136352; TOI-2011) is composed of three exoplanets with masses of 4.7, 11.2, and 8.6 Earth masses (M-circle plus). The TESS and CHEOPS missions revealed that all three planets are transiting... Read More about A full transit of nu(2) Lupi d and the search for an exomoon in its Hill sphere with CHEOPS.

Glancing through the debris disk: Photometric analysis of DE Boo with CHEOPS (2023)
Journal Article

DE Boo is a unique system, with an edge-on view through the debris disk around the star. The disk, which is analogous to the Kuiper belt in the Solar System, was reported to extend from 74 to 84 AU from the central star. The high photometric precisio... Read More about Glancing through the debris disk: Photometric analysis of DE Boo with CHEOPS.

TOI-1055 b: Neptunian planet characterised with HARPS, TESS, and CHEOPS (2023)
Journal Article

Hint of an exocomet transit in the CHEOPS light curve of HD 172555 (2023)
Journal Article

HD 172555 is a young (~20 Myr) A7V star surrounded by a 10 au wide debris disk suspected to be replenished partly by collisions between large planetesimals. Small evaporating transiting bodies, that is exocomets, have also been detected in this syste... Read More about Hint of an exocomet transit in the CHEOPS light curve of HD 172555.

Limb darkening measurements from TESS and Kepler light curves of transiting exoplanets (2023)
Journal Article

Inaccurate limb-darkening models can be a significant source of error in the analysis of the light curves for transiting exoplanet and eclipsing binary star systems. To test the accuracy of published limb-darkening models, I have compared limb-darken... Read More about Limb darkening measurements from TESS and Kepler light curves of transiting exoplanets.