J. Hasiba
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View article: An ultra-short period super-Earth and sub-Neptune spanning the Radius Valley orbiting the kinematic thick disc star TOI-2345
An ultra-short period super-Earth and sub-Neptune spanning the Radius Valley orbiting the kinematic thick disc star TOI-2345 Open
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…
View article: An Ultra-Short Period Super-Earth and Sub-Neptune Spanning the Radius Valley Orbiting the Kinematic Thick Disk Star TOI-2345
An Ultra-Short Period Super-Earth and Sub-Neptune Spanning the Radius Valley Orbiting the Kinematic Thick Disk Star TOI-2345 Open
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…
View article: The CHEOPS view of HD 95338b: Refined transit parameters, and a search for exomoons
The CHEOPS view of HD 95338b: Refined transit parameters, and a search for exomoons Open
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…
View article: Dark skies of the slightly eccentric WASP-18 b from its optical-to-infrared dayside emission
Dark skies of the slightly eccentric WASP-18 b from its optical-to-infrared dayside emission Open
Context . Ultra-hot Jupiters (UHJs) are gas giant exoplanets that are strongly irradiated by their star, setting intense molecular dissociation that leads to atmospheric chemistry dominated by ions and atoms. These conditions inhibit day-t…
View article: CHEOPS observations confirm nodal precession in the WASP-33 system
CHEOPS observations confirm nodal precession in the WASP-33 system Open
Aims: We aim to observe the transits and occultations of WASP-33b, 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…
View article: CHEOPS observations confirm nodal precession in the WASP-33 system
CHEOPS observations confirm nodal precession in the WASP-33 system Open
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…
View article: TOI–757 b: an eccentric transiting mini–Neptune on a 17.5–d orbit
TOI–757 b: an eccentric transiting mini–Neptune on a 17.5–d orbit Open
We report the spectroscopic confirmation and fundamental properties of TOI$-$757 b, a mini$-$Neptune on a 17.5$-$d orbit transiting a bright star ($V\, =\, 9.7$ mag) discovered by the TESS mission. We acquired high$-$precision radial veloc…
View article: TOI-757 b: an eccentric transiting mini-Neptune on a 17.5-d orbit
TOI-757 b: an eccentric transiting mini-Neptune on a 17.5-d orbit Open
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…
View article: HR 10 as seen by CHEOPS and TESS. Revealing delta Scuti pulsations, granulation-like signal and hint for transients
HR 10 as seen by CHEOPS and TESS. Revealing delta Scuti pulsations, granulation-like signal and hint for transients Open
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…
View article: Characterisation of the TOI-421 planetary system using CHEOPS, TESS, and archival radial velocity data
Characterisation of the TOI-421 planetary system using CHEOPS, TESS, and archival radial velocity data Open
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…
View article: Characterisation of the TOI-421 planetary system using CHEOPS, TESS, and archival radial velocity data
Characterisation of the TOI-421 planetary system using CHEOPS, TESS, and archival radial velocity data Open
Context . The TOI-421 planetary system contains two sub-Neptune-type planets ( P b ~ 5.2 days, T eq , b ~ 900 K, and P c ~ 16.1 days, T eq,c ~ 650 K) and is a prime target to study the formation and evolution of planets and their atmospher…
View article: The Soft X-ray Imager (SXI) on the SMILE Mission
The Soft X-ray Imager (SXI) on the SMILE Mission Open
The Soft X-ray Imager (SXI) is part of the scientific payload of the Solar wind Magnetosphere Ionosphere Link Explorer (SMILE) mission. SMILE is a joint science mission between the European Space Agency (ESA) and the Chinese Academy of Sci…
View article: Refining the properties of the TOI-178 system with CHEOPS and TESS
Refining the properties of the TOI-178 system with CHEOPS and TESS Open
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 in…
View article: Refining the properties of the TOI-178 system with CHEOPS and TESS
Refining the properties of the TOI-178 system with CHEOPS and TESS Open
The TOI-178 system consists of a nearby late K-dwarf transited by six planets in the super-Earth to mini-Neptune regime, with orbital periods between 1.9 and 20.7 days. All planets but the innermost one form a chain of Laplace resonances. …
View article: TOI-5678b: A 48-day transiting Neptune-mass planet characterized with CHEOPS and HARPS
TOI-5678b: A 48-day transiting Neptune-mass planet characterized with CHEOPS and HARPS Open
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…
View article: Phase curve and geometric albedo of WASP-43b measured with CHEOPS, TESS, and HST WFC3/UVIS
Phase curve and geometric albedo of WASP-43b measured with CHEOPS, TESS, and HST WFC3/UVIS Open
Context. Observations of the phase curves and secondary eclipses of extrasolar planets provide a window onto the composition and thermal structure of the planetary atmospheres. For example, the photometric observations of secondary eclipse…
View article: The EBLM project – IX. Five fully convective M-dwarfs, precisely measured with <i>CHEOPS</i> and <i>TESS</i> light curves
The EBLM project – IX. Five fully convective M-dwarfs, precisely measured with <i>CHEOPS</i> and <i>TESS</i> light curves Open
Eclipsing binaries are important benchmark objects to test and calibrate stellar structure and evolution models. This is especially true for binaries with a fully convective M-dwarf component for which direct measurements of these stars’ m…
View article: The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve
The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve Open
Context. Gas giants orbiting close to hot and massive early-type stars can reach dayside temperatures that are comparable to those of the coldest stars. These ‘ultra-hot Jupiters’ have atmospheres made of ions and atomic species from molec…
View article: Exploiting timing capabilities of the CHEOPS mission with warm-Jupiter planets
Exploiting timing capabilities of the CHEOPS mission with warm-Jupiter planets Open
We present 17 transit light curves of seven known warm-Jupiters observed with the CHaracterising ExOPlanet Satellite (CHEOPS). The light curves have been collected as part of the CHEOPS Guaranteed Time Observation (GTO) program that search…
View article: Exploiting timing capabilities of the CHEOPS mission with warm-Jupiter planets
Exploiting timing capabilities of the CHEOPS mission with warm-Jupiter planets Open
We present 17 transit light curves of seven known warm-Jupiters observed with the CHaracterising ExOPlanet Satellite (CHEOPS). The light curves have been collected as part of the CHEOPS Guaranteed Time Observation (GTO) program that search…
View article: The CHEOPS mission
The CHEOPS mission Open
The CHaracterising ExOPlanet Satellite (CHEOPS) was selected on October 19, 2012, as the first small mission (S-mission) in the ESA Science Programme and successfully launched on December 18, 2019, as a secondary passenger on a Soyuz-Frega…