Explanipedia

BEBOP VIII. SOPHIE radial velocities reveal an eccentric, circumbinary brown dwarf Open

A. H. M. J. Triaud, Thomas A Baycroft, N. Heidari, A. Santerne, A. J. Adamson , et al. · 2025

Circumbinary configurations offer a test of planet formation in an altered environment, where the inner binary has perturbed a protoplanetary disc. Comparisons of the physical and orbital parameters between the circumbinary planet populati…

The CHEOPS view of HD 95338b: Refined transit parameters, and a search for exomoons Open

Szilárd Kálmán, A. E. Simon, A. Deline, Sz. Csizmadia, M. Gy. Szabó , et al. · 2025

Context . Despite the ever-increasing number of known exoplanets, no uncontested detections have been made of their satellites, known as exomoons. Aims . The quest to find exomoons is at the forefront of exoplanetary sciences. Certain spac…

Panopticon: a deep learning model to detect individual transits in unfiltered light curves Open

H. G. Vivien, M. Deleuil, Ilias Carega, Nicholas Jannsen, J. De Ridder , et al. · 2025

In the context of large scale photometric surveys, monitoring hundreds of thousands of stars in the search for exoplanets, one of the main bottlenecks remains reliable and rapid identification of exoplanet candidates. As it stands, the det…

A high geometric albedo for LTT9779b points toward a metal-rich atmosphere and silicate clouds Open

Suman Saha, J. S. Jenkins, Vivien Parmentier, S. Hoyer, M. Deleuil , et al. · 2025

Aims . In this work, our aim is to confirm the high albedo of the benchmark ultra-hot Neptune LTT9779b using 20 secondary eclipse measurements of the planet observed with CHEOPS. In addition, we performed a search for variability in the re…

The KELT-7b atmospheric thermal-inversion conundrum revisited with CHEOPS, TESS, and additional data Open

Z. Garai, A. Krenn, Patricio E. Cubillos, G. Bruno, A. M. S. Smith , et al. · 2025

Context . Early theoretical works suggested that ultrahot Jupiters have inverted temperature-pressure (T–P) profiles in the presence of optical absorbers, such as TiO and VO. Recently, an inverted T–P profile of KELT-7b was detected, in ag…

The KELT-7b atmospheric thermal-inversion conundrum revisited with CHEOPS, TESS, and additional data Open

Z. Garai, A. Krenn, P. E. Cubillos, G. Bruno, Allison Smith , et al. · 2025

Ultrahot Jupiters are predicted to show inverted temperature-pressure (T-P) profiles in the presence of optical absorbers such as TiO and VO. An inverted T-P profile of KELT-7b was recently detected, in line with these predictions, but suc…

Searching for hot water world candidates with CHEOPS Open

J.A. Egger, Daria Kubyshkina, Y. Alibert, H.P. Osborn, A. Bonfanti , et al. · 2025

Studying the composition of exoplanets is one of the most promising approaches to observationally constrain planet formation and evolution processes. However, this endeavour is complicated for small exoplanets by the fact that a wide range…

Searching for Hot Water World Candidates with CHEOPS: Supplementary Material for TOI-238 b and TOI-1685 b (atmospheric evolution tracks) Open

J. A. Egger, Daria Kubyshkina, Y. Alibert, H. P. Osborn, A. Bonfanti , et al. · 2025

This distribution includes the supplementary data for sections 3.1.5 and 3.2.4 of Egger et al., 2025 (accepted for publication in A&A; https://arxiv.org/pdf/2502.07887), namely, the atmospheric evolution tracks of TOI-238 b and TOI-1685 b,…

The PLATO field selection process Open

V. Nascimbeni, G. Piotto, J. Cabrera, M. Montalto, S. Marinoni , et al. · 2025

PLAnetary Transits and Oscillations of stars (PLATO) is an ESA M-class mission to be launched by the end of 2026 to discover and characterize transiting planets around bright and nearby stars, and in particular habitable rocky planets host…

Transit-timing variations in the AU Mic system observed with CHEOPS Open

Ádám Boldog, M. Gy. Szabó, L. Kriskovics, L. Borsato, D. Gandolfi , et al. · 2025

Context . AU Mic is a very active M dwarf star with an edge-on debris disk and two known transiting sub-Neptunes with a possible third planetary companion. The two transiting planets exhibit significant transit-timing variations (TTVs) tha…

The PLATO field selection process. II. Characterization of LOPS2, the first long-pointing field Open

V. Nascimbeni, G. Piotto, J. Cabrera, M. Montalto, S. Marinoni , et al. · 2025

PLAnetary Transits and Oscillations of stars (PLATO) is an ESA M-class mission to be launched by the end of 2026 to discover and characterize transiting planets around bright and nearby stars, and in particular habitable rocky planets host…

Characterization of seven transiting systems, including four warm Jupiters from SOPHIE and TESS Open

N. Heidari, G. Hébrard, E. Martioli, J.D. Eastman, J.M. Jackson , et al. · 2024

While several thousand exoplanets are now confirmed, the number of known transiting warm Jupiters (10 d < period < 200 d) remains relatively small. These planets are generally believed to have formed outside the snowline and migrated to th…

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…

Hints of a close outer companion to the ultra-hot Jupiter TOI-2109 b Open

Jan‐Vincent Harre, A. M. S. Smith, S. C. C. Barros, V. Singh, J. Korth , et al. · 2024

Context . Hot Jupiters (HJs) with close-by planetary companions are rare, with only a handful of them having been discovered so far. This could be due to their suggested dynamical histories, which lead to the possible ejection of other pla…

A close outer companion to the ultra-hot Jupiter TOI-2109 b? Open

J. -V. Harre, A. M. S. Smith, S. C. C. Barros, V. Singh, J. Korth , et al. · 2024

Hot Jupiters with close-by planetary companions are rare, with only a handful of them having been discovered so far. This could be due to their suggested dynamical histories, leading to the possible ejection of other planets. TOI-2109 b is…

The CHEOPS view of the climate of WASP-3 b Open

G. Scandariato, L. Carone, Patricio E. Cubillos, P. F. L. Maxted, T. Zingales , et al. · 2024

Context . Hot Jupiters are giant planets subject to intense stellar radiation. The physical and chemical properties of their atmosphere make them the most amenable targets for atmospheric characterization. Aims . In this paper we analyze t…

BEBOP VI. Enabling the detection of circumbinary planets orbiting double-lined binaries with the DOLBY method of radial-velocity extraction Open

S. Lalitha, Thomas A. Baycroft, I. Boisse, N. Heidari, A. Santerne , et al. · 2024

Circumbinary planets - planets that orbit both stars in a binary system - offer the opportunity to study planet formation and orbital migration in a different environment compare to single stars. However, despite the fact that > 90% of bin…

The K2-24 planetary system revisited by CHEOPS Open

V. Nascimbeni, L. Borsato, P. Leonardi, S. G. Sousa, T. G. Wilson , et al. · 2024

The planetary system K2-24 is composed of two transiting low-density Neptunians locked in an almost perfect 2:1 resonance and showing large transit time variations (TTVs), and it is an excellent laboratory to search for signatures of plane…

Panopticon: a novel deep learning model to detect single transit events with no prior data filtering in PLATO light curves Open

H. G. Vivien, M. Deleuil, N. Jannsen, J. De Ridder, Dries Seynaeve , et al. · 2024

To prepare for the analyses of the future PLATO light curves, we develop a deep learning model, Panopticon, to detect transits in high precision photometric light curves. Since PLATO's main objective is the detection of temperate Earth-siz…

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. …

TOI-757 b: an eccentric transiting mini-Neptune on a 17.5-d orbit Open

A. Alqasim, N. Grieves, Nelson Augusto Rosário, D. Gandolfi, John H. Livingston , et al. · 2024

We report the spectroscopic confirmation and fundamental properties of TOI-757 b, a mini-Neptune on a 17.5-day orbit transiting a bright star ($V = 9.7$ mag) discovered by the TESS mission. We acquired high-precision radial velocity measur…

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. …

Unveiling the internal structure and formation history of the three planets transiting HIP 29442 (TOI-469) with CHEOPS Open

J. A. Egger, H. P. Osborn, Daria Kubyshkina, C. Mordasini, Y. Alibert , et al. · 2024

Multiplanetary systems spanning the radius valley are ideal testing grounds for exploring the different proposed explanations for the observed bimodality in the radius distribution of close-in exoplanets. One such system is HIP 29442 (TOI-…

New ephemerides and detection of transit-timing variations in the K2-138 system using high-precision CHEOPS photometry Open

H. G. Vivien, S. Hoyer, M. Deleuil, S. Sulis, A. Santerne , et al. · 2024

Multi-planet systems are a perfect laboratory for constraining planetary formation models. A few of these systems present planets that come very close to mean motion resonance, potentially leading to significant transit-timing variations (…

The PLATO Mission Open

H. Rauer, C. Aerts, J. Cabrera, M. Deleuil, Anders Erikson , et al. · 2024

PLATO (PLAnetary Transits and Oscillations of stars) is ESA's M3 mission designed to detect and characterise extrasolar planets and perform asteroseismic monitoring of a large number of stars. PLATO will detect small planets (down to <2 R_…

CHEOPS in-flight performance Open

A. Fortier, A. E. Simon, C. Broeg, G. Olofsson, A. Deline , et al. · 2024

Context . Since the discovery of the first exoplanet almost three decades ago, the number of known exoplanets has increased dramatically. By beginning of the 2000s it was clear that dedicated facilities to advance our studies in this field…

CHEOPS in-flight performance: A comprehensive look at the first 3.5 years of operations Open

A. Fortier, A. E. Simon, C. Broeg, G. Olofsson, A. Deline , et al. · 2024

CHEOPS is a space telescope specifically designed to monitor transiting exoplanets orbiting bright stars. In September 2023, CHEOPS completed its nominal mission and remains in excellent operational conditions. The mission has been extende…

HIP 41378 observed by CHEOPS: Where is planet d? Open

S. Sulis, L. Borsato, S. Grouffal, H. P. Osborn, A. Santerne , et al. · 2024

HIP 41378 d is a long-period planet that has only been observed to transit twice, three years apart, with K2. According to stability considerations and a partial detection of the Rossiter–McLaughlin effect, P d = 278.36 d has been determin…

A low-mass sub-Neptune planet transiting the bright active star HD 73344 Open

S. Sulis, I.J.M. Crossfield, A. Santerne, Melaine Saillenfest, S. Sousa , et al. · 2024

Context. Planets with radii of between 2 and 4 R ⊕ closely orbiting solar-type stars are of significant importance for studying the transition from rocky to giant planets, and are prime targets for atmospheric characterization by missions …

Characterisation of the TOI-421 planetary system using CHEOPS, TESS, and archival radial velocity data Open

A. Krenn, Daria Kubyshkina, L. Fossati, J. A. Egger, A. Bonfanti , et al. · 2024

The TOI-421 planetary system contains two sub-Neptune-type planets and is a prime target to study the formation and evolution of planets and their atmospheres. The inner planet is especially interesting as the existence of a hydrogen-domin…

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