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19922026
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143 papers · 1 filter

astro-ph.EP2026★ 1 cited

Evolution and Observable Properties of Rocky Planet Atmospheres

Marie-Luise Steinmeyer, Lena Noack, Philipp Baumeister +9

The atmospheric composition of rocky exoplanets offers an important tool for constraining the properties of the interior of this type of planet, beyond what is possible from measur…

astro-ph.EP2026★ 1 cited

The multi-planet system TOI-5624: Four transiting sub-Neptunes with an outer companion revealed by transit-timing variations

A. Bonfanti, D. Gandolfi, P. Leonardi +96

Following the 2022 alert of a TESS object of interest transiting TOI-5624 (a G7 V star 100 pc away), a CHEOPS campaign in 2023 detected four planetary signals at $P_b\approx3…

astro-ph.EP2026

The Goldilocks problem for detecting water in terrestrial planets: Constraining water abundances in the mid-IR with LIFE

Sarah Rugheimer, Eleonora Alei, Björn S. Konrad +7

We investigate how well the Large Interferometer for Exoplanets (LIFE) mission concept can detect habitable conditions on exoplanets through the presence of atmospheric water vapor…

astro-ph.EP2026★ 1 cited

Gas-depleted planet formation occurred in the four-planet system around the red dwarf LHS 1903

Thomas G. Wilson, Anna M. Simpson, Andrew Collier Cameron +173

Small exoplanet radii show two populations, referred to as super-Earths and sub-Neptunes, separated by a gap known as the radius valley. This may be produced by the removal of atmo…

astro-ph.EP2025

Giant Outer Transiting Exoplanet Mass (GOTEM) Survey.VII. TOI-6041: a multi-planet system including a warm Neptune exhibiting strong TTVs

N. Heidari, A. Alnajjarine, H. P. Osborn +101

We present the characterization of the TOI-6041 system, a bright () G7-type star hosting at least two planets. The inner planet, TOI-6041b, is a warm Neptune wit…

astro-ph.EP2025

Improved characterization of the TOI-2141 system: a dense sub-Neptune with non-transiting inner and outer companions

R. Luque, K. W. F. Lam, J. Cabrera +87

We aim to refine the fundamental parameters of the TOI-2141 planetary system, which includes a transiting sub-Neptune orbiting a Sun-like star in a relatively long orbit of 18.26 d…

astro-ph.EP2025★ 4 cited

The influence of interior structure and thermal state on impact melt generation upon large impacts onto terrestrial planets

Lukas Manske, Thomas Ruedas, Ana-Catalina Plesa +4

We investigate the melt production of planetary impacts as a function of planet size (=0.1-1.5), impactor size (=1-1000 km), and core size ratio ($R_\mathrm{…

astro-ph.EP2025★ 8 cited

Dark skies of the slightly eccentric WASP-18 b from its optical-to-infrared dayside emission

A. Deline, P. E. Cubillos, L. Carone +86

We performed a joint analysis of phase-curve observations of the ultra-hot Jupiter WASP-18 b from the visible to the mid-infrared, using data from CHEOPS, TESS and Spitzer. We aim…

astro-ph.EP2025★ 27 cited

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

V. Nascimbeni, G. Piotto, J. Cabrera +26

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 n…

astro-ph.EP2025★ 11 cited

Characterizing WASP-43b's interior structure: unveiling tidal decay and apsidal motion

Lia Marta Bernabò, Szilárd Csizmadia, Alexis M. S. Smith +8

Context. Recent developments in exoplanetary research highlight the importance of Love numbers in understanding their internal dynamics, formation, migration history and their pote…

astro-ph.EP2024★ 12 cited

A possible misaligned orbit for the young planet AU Mic c

H. Yu, Z. Garai, M. Cretignier +98

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 measur…

astro-ph.EP2024★ 3 cited

From CO- to HO-dominated atmospheres and back -- How mixed outgassing changes the volatile distribution in magma oceans around M dwarf stars

Ludmila Carone, Rory Barnes, Lena Noack +7

We investigate the impact of CO on TRAPPIST-1 e, f and g during the magma ocean stage. These potentially habitable rocky planets are currently the most accessible for astronomi…

astro-ph.EP2024★ 2 cited

CHEOPS observations confirm nodal precession in the WASP-33 system

A. M. S. Smith, Sz. Csizmadia, V. Van Grootel +86

Aims: We aim to observe the transits and occultations of WASP-33b, which orbits a rapidly-rotating Scuti pulsator, with the goal of measuring the orbital obliquity via the grav…

astro-ph.EP2024★ 3 cited

A joint effort to discover and characterize two resonant mini Neptunes around TOI-1803 with TESS, HARPS-N and CHEOPS

T. Zingales, L. Malavolta, L. Borsato +130

We present the discovery of two mini Neptunes near a 2:1 orbital resonance configuration orbiting the K0 star TOI-1803. We describe their orbital architecture in detail and suggest…

astro-ph.EP2024★ 14 cited

H-HO demixing in Uranus and Neptune: Adiabatic structure models

Marina Cano Amoros, Nadine Nettelmann, Nicola Tosi +2

Demixing properties of planetary major constituents influence the interior structure and evolution of planets. Comparing experimental and computational data on the miscibility of h…

astro-ph.EP2024★ 5 cited

The K2-24 planetary system revisited by CHEOPS

V. Nascimbeni, L. Borsato, P. Leonardi +82

K2-24 is a planetary system composed of two transiting low-density Neptunians locked in an almost perfect 2:1 resonance and showing large TTVs, i.e., an excellent laboratory to sea…

astro-ph.EP2024★ 11 cited

Validation of up to seven TESS planet candidates through multi-colour transit photometry using MuSCAT2 data

A. Peláez-Torres, E. Esparza-Borges, E. Pallé +62

The TESS mission searches for transiting exoplanets by monitoring the brightness of hundreds of thousands of stars across the entire sky. M-type planet hosts are ideal targets for…

astro-ph.EP2024★ 5 cited

Geodynamics of super-Earth GJ 486b

Tobias G. Meier, Dan J. Bower, Tim Lichtenberg +8

Many super-Earths are on very short orbits around their host star and, therefore, more likely to be tidally locked. Because this locking can lead to a strong contrast between the d…

astro-ph.EP2024★ 16 cited

Characterisation of the Warm-Jupiter TOI-1130 system with CHEOPS and photo-dynamical approach

L. Borsato, D. Degen, A. Leleu +93

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…

astro-ph.EP2024★ 26 cited

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

J. A. Egger, H. P. Osborn, D. Kubyshkina +91

Multiplanetary systems spanning the radius valley are ideal testing grounds for exploring the proposed explanations for the observed bimodality in the radius distribution of close-…

astro-ph.EP2024★ 10 cited

Photo-dynamical characterisation of the TOI-178 resonant chain

A. Leleu, J. -B. Delisle, L. Delrez +104

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 1.2 to 2.9 earth radius and orbital…

astro-ph.EP2024★ 6 cited

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

N. M. Rosário, O. D. S. Demangeon, S. C. C. Barros +90

We aim to constrain the internal structure and composition of HD 15337 b and c, two short-period planets situated on opposite sides of the radius valley, using new transit photomet…

astro-ph.EP2023★ 64 cited

A resonant sextuplet of sub-Neptunes transiting the bright star HD 110067

R. Luque, H. P. Osborn, A. Leleu +149

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. Yet, thei…

astro-ph.EP2023

No random transits in CHEOPS observations of HD 139139

R. Alonso, S. Hoyer, M. Deleuil +78

HD 139139 (a.k.a. 'The Random Transiter') is a star that exhibited enigmatic transit-like features with no apparent periodicity in K2 data. The shallow depth of the events (2…