Explanipedia

Characterization of debris disks observed with SPHERE Open

N. Engler, J. Milli, Nicole Pawellek, R. Gratton, P. Thébault , et al. · 2025

Aims . This study aims to characterize debris disk targets observed with SPHERE across multiple programs, with the goal of identifying systematic trends in disk morphology, dust mass, and grain properties as a function of stellar parameter…

An ultra-short period super-Earth and sub-Neptune spanning the Radius Valley orbiting the kinematic thick disc star TOI-2345 Open

Yoshi Nike Emilia Eschen, T. G. Wilson, A. Bonfanti, C. M. Persson, S. G. Sousa , et al. · 2025

A crucial chemical link between stars and their orbiting exoplanets is thought to exist. If universal, this connection could affect the formation and evolution of all planets. Therefore, this potential vital link needs testing by character…

Detection and characterisation of a 106-day transiting Jupiter: TOI-2449 b/NGTS-36 b Open

Solène Ulmer-Moll, Samuel Gill, R. Brahm, Alastair B Claringbold, M. Lendl , et al. · 2025

Context . Only a handful of transiting giant exoplanets with orbital periods longer than 100 days are known. These warm exoplanets are valuable objects, as their radius and mass can be measured and lead to an in-depth characterisation of t…

An Ultra-Short Period Super-Earth and Sub-Neptune Spanning the Radius Valley Orbiting the Kinematic Thick Disk Star TOI-2345 Open

Yoshi Nike Emilia Eschen, T. G. Wilson, A. Bonfanti, C. M. Persson, S. G. Sousa , et al. · 2025

A crucial chemical link between stars and their orbiting exoplanets is thought to exist. If universal, this connection could affect the formation and evolution of all planets. Therefore, this potential vital link needs testing by character…

High Five From ASTEP: Three Validated Planets and Two Eclipsing Binaries in a Diverse Set of Long-Period Candidates Open

Erika Rea, Maximilian N. Günther, George Dransfield, T. Guillot, A. H. M. J. Triaud , et al. · 2025

We present the analysis of five long-period TESS Objects of Interest (TOIs), each with orbital periods exceeding one month. Initially identified by the Transiting Exoplanet Survey Satellite (TESS), we extensively monitored these targets wi…

A Cold and Super-Puffy Planet on a Prograde Orbit Open

Juan I. Espinoza-Retamal, Rafael Brahm, Cristóbal Petrovich, Andrés Jordán, Thomas Henning , et al. · 2025

We report the discovery of TOI-4507 b, a transiting sub-Saturn with a density $<$ 0.2 g/cm$^3$ on a 105-day prograde orbit around a 700 Myr old F star. The transits were detected using data from TESS as well as the Antarctic telescope ASTE…

Transit timing variations in HIP 41378: CHEOPS and TESS confirm a non-transiting sixth planet in the system Open

P. Leonardi, L. Borsato, L. Pagliaro, Daria Kubyshkina, J.A. Egger , et al. · 2025

In multiple-planet systems, gravitational interactions of exoplanets could lead to transit timing variations (TTVs), whose amplitude becomes significantly enhanced when planets are in or near mean-motion resonances (MMRs), making them more…

Detection and characterisation of a 106-day transiting Jupiter : TOI-2449 b / NGTS-36 b Open

Solène Ulmer-Moll, Samuel Gill, R. Brahm, Alastair B Claringbold, M. Lendl , et al. · 2025

Only a handful of transiting giant exoplanets with orbital periods longer than 100 days are known. These warm exoplanets are valuable objects as their radius and mass can be measured leading to an in-depth characterisation of the planet's …

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…

HD 35843: A Sun-like Star Hosting a Long-period Sub-Neptune and Inner Super-Earth Open

Katharine Hesse, Ismael Mireles, F. Bouchy, Diana Dragomir, Solène Ulmer-Moll , et al. · 2025

We report the discovery and confirmation of two planets orbiting the metal-poor Sun-like star HD 35843 (TOI 4189). HD 35843 c is a temperate sub-Neptune transiting planet with an orbital period of 46.96 days that was first identified by Pl…

Giant Outer Transiting Exoplanet Mass (GOT ‘EM) Survey. VI. Confirmation of a Long-period Giant Planet Discovered with a Single TESS Transit Open

Zahra Essack, Diana Dragomir, Paul A. Dalba, Matthew P. Battley, David R. Ciardi , et al. · 2025

We report the discovery and confirmation of TOI-4465 b, a 1.25 R J , 5.89 M J ± 0.26 M J giant planet orbiting a G dwarf star at d ≃ 122 pc. The planet was detected as a single-transit event in data from Sector 40 of the Tran…

TOI-6695: A Pair of Near-resonant Massive Planets Observed with TESS from the WINE Survey* Open

Jan Eberhardt, Trifon Trifonov, Thomas Henning, Marcelo Tala Pinto, Rafael Brahm , et al. · 2025

We present the discovery and characterization of a pair of warm Jovian-mass exoplanets orbiting the Sun-like star TOI-6695, based on Transiting Exoplanet Survey Satellite (TESS) transits and precise radial velocity (RV) measurements obtain…

HD 35843: A Sun-like star hosting a long period sub-Neptune and inner super-Earth Open

Katharine Hesse, Ismael Mireles, F. Bouchy, Diana Dragomir, Solène Ulmer-Moll , et al. · 2025

We report the discovery and confirmation of two planets orbiting the metal-poor Sun-like star, HD 35843 (TOI 4189). HD 35843 c is a temperate sub-Neptune transiting planet with an orbital period of 46.96 days that was first identified by P…

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,…

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

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

AU Mic is a very active M dwarf with an edge-on debris disk and two transiting sub-Neptunes with a possible third planetary companion. The two transiting planets exhibit significant transit-timing variations (TTVs) that are caused by the g…

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…

Discovery and Characterization of an Eccentric, Warm Saturn Transiting the Solar Analog TOI-4994* Open

Romy Rodríguez Martínez, Jason D. Eastman, Karen A. Collins, Joseph E. Rodriguez, David Charbonneau , et al. · 2025

We present the detection and characterization of TOI-4994b (TIC 277128619b), a warm Saturn-sized planet discovered by the NASA Transiting Exoplanet Survey Satellite. TOI-4994b transits a G-type star ( V = 12.6 mag) with a mass, radius, and…

Discovery of a cold giant planet and mass measurement of a hot super-Earth in the multi-planetary system WASP-132 Open

Nolan Grieves, F. Bouchy, D. J. Armstrong, B. Akinsanmi, Angelica Psaridi , et al. · 2025

Hot Jupiters generally do not have nearby planet companions, as they may have cleared out other planets during their inward migration from more distant orbits. This gives evidence that hot Jupiters more often migrate inward via high-eccent…

<i>NGTS</i>-EB-7, an eccentric, long-period, low-mass eclipsing binary Open

Toby Rodel, C. A. Watson, Solène Ulmer-Moll, Samuel Gill, P. F. L. Maxted , et al. · 2024

Despite being the most common types of stars in the Galaxy, the physical properties of late M dwarfs are often poorly constrained. A trend of radius inflation compared to evolutionary models has been observed for earlier type M dwarfs in e…

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…

Discovery and Characterization of an Eccentric, Warm Saturn Transiting the Solar Analog TOI-4994 Open

Romy Rodríguez Martínez, Jason D. Eastman, Karen A. Collins, Joseph Rodriguez, David Charbonneau , et al. · 2024

We present the detection and characterization of TOI-4994b (TIC 277128619b), a warm Saturn-sized planet discovered by the NASA Transiting Exoplanet Survey Satellite (TESS). TOI-4994b transits a G-type star (V = 12.6 mag) with a mass, radiu…

A possible misaligned orbit for the young planet AU Mic c Open

Haochuan Yu, Z. Garai, M. Cretignier, Gy. M. Szabó, S. Aigrain , et al. · 2024

The AU Microscopii planetary system is only 24 Myr old, and its geometry may provide clues about the early dynamical history of planetary systems. Here, we present the first measurement of the Rossiter–McLaughlin effect for the warm sub-Ne…

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 (CHaracterising ExOPlanet Satellite) and TESS (Transiting Exoplanet Survey Satellite) to clarify the architecture of the planetary system hosted by the old Galactic thick disc star TOI-561. Our globa…

A long-period transiting substellar companion in the super-Jupiters to brown dwarfs mass regime and a prototypical warm-Jupiter detected by TESS★ Open

M. I. Jones, Yared Reinarz, Rafael Brahm, Marcelo Tala Pinto, Jan Eberhardt , et al. · 2024

We report on the confirmation and follow-up characterization of two long-period transiting substellar companions on low-eccentricity orbits around TIC 4672985 and TOI-2529, whose transit events were detected by the TESS space mission. Grou…

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…

In-situ observations of resident space objects with the CHEOPS space telescope Open

N. Billot, S. Hellmich, W. Benz, A. Fortier, D. Ehrenreich , et al. · 2024

TOI-2447 b / NGTS-29 b: a 69-day Saturn around a Solar analogue Open

Samuel Gill, Daniel Bayliss, Solène Ulmer-Moll, P. J. Wheatley, Rafael Brahm , et al. · 2024

Discovering transiting exoplanets with relatively long orbital periods (>10 d) is crucial to facilitate the study of cool exoplanet atmospheres (Teq < 700 K) and to understand exoplanet formation and inward migration further out than…

Discovery of a cold giant planet and mass measurement of a hot super-Earth in the multi-planetary system WASP-132 Open

Nolan Grieves, F. Bouchy, D. J. Armstrong, B. Akinsanmi, Angelica Psaridi , et al. · 2024

Hot Jupiters generally do not have nearby planet companions, as they may have cleared out other planets during their inward migration from more distant orbits. This gives evidence that hot Jupiters more often migrate inward via high-eccent…

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…

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