Explanipedia

Author Correction: Helioseismic inference of the solar radiative opacity Open

G. Buldgen, Jean‐Christophe Pain, Ph. Cossé, C. Blancard, F. Gilleron , et al. · 2025

A four-planet system orbiting the old thick disk star TOI-1203 Open

D. Gandolfi, A. Alnajjarine, L. M. Serrano, J. A. Egger, K. W. F. Lam , et al. · 2025

TOI-1203 is a bright (V=8.6) G3 V star known to host a transiting warm sub-Neptune on a 25.5 d orbit. Here we report on an intensive high-precision radial velocity and photometric follow-up campaign carried out with the HARPS spectrograph …

Geometric albedo of WASP-12 b and WASP-76 b in the CHEOPS and TESS bandpasses (Corrigendum) Open

Patricio E. Cubillos, O. D. S. Demangeon, B. Akinsanmi, Y. Alibert, R. Alonso , et al. · 2025

International audience

CHEOPS observations confirm nodal precession in the WASP-33 system Open

A. M. S. Smith, Sz. Csizmadia, V. Van Grootel, M. Lendl, C. M. Persson , et al. · 2024

Aims . We aim to observe the transits and occultations of WASP-33 b, which orbits a rapidly rotating δ Scuti pulsator, with the goal of measuring the orbital obliquity via the gravity-darkening effect, and constraining the geometric albedo…

Architecture of TOI-561 planetary system Open

G. Piotto, T. Zingales, L. Borsato, J. A. Egger, A. C. M. Correia , et al. · 2024

We present new observations from CHEOPS and TESS to clarify the architecture of the planetary system hosted by the old Galactic thick disk star TOI-561. Our global analysis, which also includes previously published photometric and radial v…

Characterisation of the warm-Jupiter TOI-1130 system with CHEOPS and a photo-dynamical approach Open

L. Borsato, David Degen, A. Leleu, M. J. Hooton, J. A. Egger , et al. · 2024

Context. Among the thousands of exoplanets discovered to date, approximately a few hundred gas giants on short-period orbits are classified as ‘lonely’ and only a few are in a multi-planet system with a smaller companion on a close orbit. …

HR 10 as seen by CHEOPS and TESS. Revealing delta Scuti pulsations, granulation-like signal and hint for transients Open

Sébastien Salmon, V. Van Grootel, S. Sulis, Gy. M. Szabó, A. Brandeker , et al. · 2024

HR 10 has only recently been identified as a binary system. Previously thought to be an A-type shell star, it appears that both components are fast-rotating A-type stars, each presenting a circumstellar envelope. Although showing complex p…

Precise characterisation of HD 15337 with CHEOPS: A laboratory for planet formation and evolution Open

Nelson Augusto Rosário, O. D. S. Demangeon, S. C. C. Barros, D. Gandolfi, J. A. Egger , et al. · 2024

Context . The HD 15337 (TIC 120896927, TOI-402) system was observed by the Transiting Exoplanet Survey Satellite (TESS), revealing the presence of two short-period planets situated on opposite sides of the radius gap. This offers an excell…

Asymmetry in the atmosphere of the ultra-hot Jupiter WASP-76 b Open

O. D. S. Demangeon, Patricio E. Cubillos, V. Singh, T. G. Wilson, L. Carone , et al. · 2024

Context. WASP-76 b has been a recurrent subject of study since the detection of a signature in high-resolution transit spectroscopy data indicating an asymmetry between the two limbs of the planet. The existence of this asymmetric signatur…

Three-dimensional time-dependent convection model for asteroseismology Open

S. Lizin, M.‐A. Dupret, Sébastien Salmon, H.‐G. Ludwig · 2024

Context. Due to an ill-depicting model of the convective layers below the photosphere in 1D stellar models (structural contribution) and/or a misrepresentation of the coupling between convection and oscillations (modal contribution), a wel…

Planets observed with CHEOPS Open

M. Fridlund, Iskra Georgieva, A. Bonfanti, Y. Alibert, C. M. Persson , et al. · 2024

Context. M-dwarf stars are the most common of potential exoplanet host stars in the Galaxy. It is therefore very important to understand planetary systems orbiting such stars and to determine the physical parameters of such planets with hi…

Angular momentum transport near convective-core boundaries of Gamma Doradus stars Open

F. D. Moyano, P. Eggenberger, Sébastien Salmon · 2024

Recent asteroseismic studies have revealed that the convective core of γ Doradus stars rotates faster than their radiative interior. We study the development of differential rotation near the convective core to test angular momentum transp…

CHEOPS observations of KELT-20 b/MASCARA-2 b: An aligned orbit and signs of variability from a reflective day side Open

V. Singh, G. Scandariato, A. M. S. Smith, Patricio E. Cubillos, M. Lendl , et al. · 2023

Context . Occultations are windows of opportunity to indirectly peek into the dayside atmosphere of exoplanets. High-precision transit events provide information on the spin-orbit alignment of exoplanets around fast-rotating hosts. Aims . …

CHEOPS observations of KELT-20 b/MASCARA-2 b: An aligned orbit and signs of variability from a reflective dayside Open

V. Singh, G. Scandariato, Allison Smith, P. E. Cubillos, M. Lendl , et al. · 2023

Occultations are windows of opportunity to indirectly peek into the dayside atmosphere of exoplanets. High-precision transit events provide information on the spin-orbit alignment of exoplanets around fast-rotating hosts. We aim to precise…

LHS 1903 provides evidence for gas-depleted formation of planets around M-dwarfs Open

T. G. Wilson, Anna Simpson, A. Collier Cameron, Ryan Cloutier, V. Adibekyan , et al. · 2023

Many important advances in planet formation theory have come from the discovery of unexpected planets. The thousands of discovered exoplanets have unveiled demographic trends, such as the bimodality of planetary radius distribution known a…

Angular momentum transport by magnetic fields in main-sequence stars with Gamma Doradus pulsators Open

F. D. Moyano, P. Eggenberger, Sébastien Salmon, Joey S. G. Mombarg, Sylvia Ekström · 2023

Context. Asteroseismic studies show that cores of post-main-sequence stars rotate more slowly than theoretically predicted by stellar models with purely hydrodynamical transport processes. Recent studies of main-sequence stars, particularl…

Refined parameters of the HD 22946 planetary system and the true orbital period of planet d Open

Z. Garai, H. P. Osborn, D. Gandolfi, A. Brandeker, S. G. Sousa , et al. · 2023

Multi-planet systems are important sources of information regarding the evolution of planets. However, the long-period planets in these systems often escape detection. HD 22946 is a bright star around which 3 transiting planets were identi…

TOI-5678 b: A 48-day transiting Neptune-mass planet characterized with CHEOPS and HARPS Open

S. Ulmer-Moll, H. P. Osborn, A. Tuson, J.A. Egger, M. Lendl , et al. · 2023

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 o…

Refined parameters of the HD 22946 planetary system and the true orbital period of planet d Open

Z. Garai, H. P. Osborn, D. Gandolfi, A. Brandeker, S. G. Sousa , et al. · 2023

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 primordi…

TOI-5678b: A 48-day transiting Neptune-mass planet characterized with CHEOPS and HARPS Open

Solène Ulmer-Moll, H. P. Osborn, A. Tuson, J. A. Egger, M. Lendl , et al. · 2023

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 th…

The planetary system around HD 190622 (TOI-1054) Open

J. Cabrera, D. Gandolfi, L. M. Serrano, Sz. Csizmadia, J. A. Egger , et al. · 2023

Context . Giant planets are known to dominate the long-term stability of planetary systems due to their prevailing gravitational interactions, but they are also thought to play an important role in planet formation. Observational constrain…

Angular momentum transport by magnetic fields in main sequence stars with Gamma Doradus pulsators Open

F. D. Moyano, P. Eggenberger, Sébastien Salmon, Joey S. G. Mombarg, Sylvia Ekström · 2023

Context. Asteroseismic studies showed that cores of post main-sequence stars rotate slower than theoretically predicted by stellar models with purely hydrodynamical transport processes. Recent studies on main sequence stars, particularly G…

A new dynamical modeling of the WASP-47 system with CHEOPS observations Open

V. Nascimbeni, L. Borsato, T. Zingales, G. Piotto, I. Pagano , et al. · 2023

Among the hundreds of known hot Jupiters (HJs), only five have been found to have companions on short-period orbits. Within this rare class of multiple planetary systems, the architecture of WASP-47 is unique, hosting an HJ (planet-b) with…

A full transit of v2 Lupi d and the search for an exomoon in its Hill sphere with CHEOPS Open

D. Ehrenreich, L. Delrez, B. Akinsanmi, T. G. Wilson, A. Bonfanti , et al. · 2023

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 ⊕ ). The TESS and CHEOPS missions revealed that all three planets are transiti…

TOI-1055 b: Neptunian planet characterised with HARPS, TESS, and CHEOPS Open

A. Bonfanti, D. Gandolfi, J. A. Egger, L. Fossati, J. Cabrera , et al. · 2023

Context. TOI-1055 is a Sun-like star known to host a transiting Neptune-sized planet on a 17.5-day orbit (TOI-1055 b). Radial velocity (RV) analyses carried out by two independent groups using nearly the same set of HARPS spectra have prov…

The geometric albedo of the hot Jupiter HD 189733b measured with CHEOPS Open

A. Krenn, M. Lendl, J. A. Patel, L. Carone, M. Deleuil , et al. · 2023

Context. Measurements of the occultation of an exoplanet at visible wavelengths allow us to determine the reflective properties of a planetary atmosphere. The observed occultation depth can be translated into a geometric albedo. This in tu…

Higher metal abundances do not solve the solar problem Open

G. Buldgen, P. Eggenberger, Alfred F. Noels, R. Scuflaire, A. M. Amarsi , et al. · 2022

Context. The Sun acts as a cornerstone of stellar physics. Thanks to spectroscopic, helioseismic and neutrino flux observations, we can use the Sun as a laboratory of fundamental physics in extreme conditions. The conclusions we draw are t…

Discovery of TOI-1260d and the characterization of the multiplanet system Open

K. W. F. Lam, J. Cabrera, M. J. Hooton, Y. Alibert, A. Bonfanti , et al. · 2022

We report the discovery of a third planet transiting the star TOI-1260, previously known to host two transiting sub-Neptune planets with orbital periods of 3.127 and 7.493 d, respectively. The nature of the third transiting planet with a 1…

Characterization of the HD 108236 system with CHEOPS and TESS Confirmation of a fifth transiting planet Open

S. Hoyer, A. Bonfanti, A. Leleu, L. Acuña, L. M. Serrano , et al. · 2022

Context. The HD 108236 system was first announced with the detection of four small planets based on TESS data. Shortly after, the transit of an additional planet with a period of 29.54 d was serendipitously detected by CHEOPS. In this way,…

CHEOPS finds KELT-1b darker than expected in visible light Open

H. Parviainen, T. G. Wilson, M. Lendl, Daniel Kitzmann, Ε. Πάλλη , et al. · 2022

Recent studies based on photometry from the Transiting Exoplanet Survey Satellite (TESS) have suggested that the dayside of KELT-1b, a strongly irradiated brown dwarf, is significantly brighter in visible light than what would be expected …

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