P. Guterman
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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: Transit-timing variations in the AU Mic system observed with CHEOPS
Transit-timing variations in the AU Mic system observed with CHEOPS Open
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…
View article: Transit-timing variations in the AU Mic system observed with CHEOPS
Transit-timing variations in the AU Mic system observed with CHEOPS Open
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…
View article: Precise characterisation of HD 15337 with CHEOPS: A laboratory for planet formation and evolution
Precise characterisation of HD 15337 with CHEOPS: A laboratory for planet formation and evolution Open
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…
View article: No random transits in CHEOPS observations of HD 139139
No random transits in CHEOPS observations of HD 139139 Open
Context. The star 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 (~200 ppm – equivalent to transiting objects with…
View article: No random transits in CHEOPS observations of HD 139139
No random transits in CHEOPS observations of HD 139139 Open
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 ($\sim$200 ppm -- equivalent to transiting objects with radii of $\…
View article: LHS 1903 provides evidence for gas-depleted formation of planets around M-dwarfs
LHS 1903 provides evidence for gas-depleted formation of planets around M-dwarfs Open
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…
View article: Two warm Neptunes transiting HIP 9618 revealed by <i>TESS</i> and <i>Cheops</i>
Two warm Neptunes transiting HIP 9618 revealed by <i>TESS</i> and <i>Cheops</i> Open
HIP 9618 (HD 12572, TOI-1471, TIC 306263608) is a bright (G = 9.0 mag) solar analogue. TESS photometry revealed the star to have two candidate planets with radii of 3.9 ± 0.044 R⊕ (HIP 9618 b) and 3.343 ± 0.039 R⊕ (HIP 9618 c). While the 2…
View article: A full transit of <i>v</i><sup>2</sup> Lupi d and the search for an exomoon in its Hill sphere with CHEOPS
A full transit of <i>v</i><sup>2</sup> Lupi d and the search for an exomoon in its Hill sphere with CHEOPS Open
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…
View article: Glancing through the debris disk: Photometric analysis of DE Boo with CHEOPS
Glancing through the debris disk: Photometric analysis of DE Boo with CHEOPS Open
DE Boo is a unique system, with an edge-on view through the debris disk around the star. The disk, which is analogous to the Kuiper belt in the Solar System, was reported to extend from 74 to 84 AU from the central star. The high photometr…
View article: Glancing through the debris disk: Photometric analysis of DE Boo with CHEOPS
Glancing through the debris disk: Photometric analysis of DE Boo with CHEOPS Open
Aims . DE Boo is a unique system, with an edge-on view through the debris disk around the star. The disk, which is analogous to the Kuiper belt in the Solar System, was reported to extend from 74 to 84 AU from the central star. The high ph…
View article: The geometric albedo of the hot Jupiter HD 189733b measured with CHEOPS
The geometric albedo of the hot Jupiter HD 189733b measured with CHEOPS Open
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…
View article: Discovery of TOI-1260d and the characterization of the multiplanet system
Discovery of TOI-1260d and the characterization of the multiplanet system Open
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…
View article: CHEOPS finds KELT-1b darker than expected in visible light
CHEOPS finds KELT-1b darker than expected in visible light Open
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 …
View article: CHEOPS geometric albedo of the hot Jupiter HD 209458 b
CHEOPS geometric albedo of the hot Jupiter HD 209458 b Open
We report the detection of the secondary eclipse of the hot Jupiter HD 209458 b in optical/visible light using the CHEOPS space telescope. Our measurement of 20.4 −3.3 +3.2 parts per million translates into a geometric albedo of A g = 0.09…
View article: Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N, and TESS
Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N, and TESS Open
We present a precise characterization of the TOI-561 planetary system obtained by combining previously published data with TESS and CHEOPS photometry, and a new set of 62 HARPS-N radial velocities (RVs). Our joint analysis confirms the pre…
View article: A pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 characterized with <i>CHEOPS</i>
A pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 characterized with <i>CHEOPS</i> Open
We report the discovery and characterization of a pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 (TIC 79748331), initially detected in the Transiting Exoplanet Survey Satellite (TESS) photometry. To characterize the system, we…
View article: Analysis of Early Science observations with the CHaracterising ExOPlanets Satellite (<i>CHEOPS</i>) using<scp>pycheops</scp>
Analysis of Early Science observations with the CHaracterising ExOPlanets Satellite (<i>CHEOPS</i>) using<span>pycheops</span> Open
CHEOPS (CHaracterising ExOPlanet Satellite) is an ESA S-class mission that observes bright stars at high cadence from low-Earth orbit. The main aim of the mission is to characterize exoplanets that transit nearby stars using ultrahigh prec…
View article: Analysis of Early Science observations with the CHaracterising ExOPlanets Satellite (CHEOPS) using pycheops
Analysis of Early Science observations with the CHaracterising ExOPlanets Satellite (CHEOPS) using pycheops Open
CHEOPS(CHaracterising ExOPlanet Satellite) is an ESA S-class mission that observes bright stars at high cadence from low-Earth orbit. The main aim of the mission is to characterize exoplanets that transit nearby stars using ultrahigh preci…
View article: fBLS — a fast folding algorithm to produce BLS periodograms in search for transiting planets
fBLS — a fast folding algorithm to produce BLS periodograms in search for transiting planets Open
We present fBLS – a novel technique for detecting transiting planets. fBLS is based on the fast-folding algorithm (FFA; Staelin 1969), extensively used in pulsar astronomy (e.g., Morello et al. 2020). fBLS simultaneously produces all the b…
View article: CHEOPS precision phase curve of the Super-Earth 55 Cancri e
CHEOPS precision phase curve of the Super-Earth 55 Cancri e Open
Context. 55 Cnc e is a transiting super-Earth (radius 1.88 R ⊕ and mass 8 M ⊕ ) orbiting a G8V host star on a 17-h orbit. Spitzer observations of the planet’s phase curve at 4.5 μm revealed a time-varying occultation depth, and MOST optica…
View article: The changing face of AU Mic b: stellar spots, spin-orbit commensurability, and transit timing variations as seen by CHEOPS and TESS
The changing face of AU Mic b: stellar spots, spin-orbit commensurability, and transit timing variations as seen by CHEOPS and TESS Open
AU Mic is a young planetary system with a resolved debris disc showing signs of planet formation and two transiting warm Neptunes near mean-motion resonances. Here we analyse three transits of AU Mic b observed with the CHaracterising ExOP…
View article: The EBLM project – VIII. First results for M-dwarf mass, radius, and effective temperature measurements using <i>CHEOPS</i> light curves
The EBLM project – VIII. First results for M-dwarf mass, radius, and effective temperature measurements using <i>CHEOPS</i> light curves Open
The accuracy of theoretical mass, radius, and effective temperature values for M-dwarf stars is an active topic of debate. Differences between observed and theoretical values have raised the possibility that current theoretical stellar str…
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…
View article: <scp>archi</scp>: pipeline for light curve extraction of <i>CHEOPS</i> background stars
<span>archi</span>: pipeline for light curve extraction of <i>CHEOPS</i> background stars Open
High precision time-series photometry from space is being used for a number of scientific cases. In this context, the recently launched CHaracterizing ExOPlanet Satellite (CHEOPS) (ESA) mission promises to bring 20 ppm precision over an ex…
View article: Expected performances of the Characterising Exoplanet Satellite (CHEOPS)
Expected performances of the Characterising Exoplanet Satellite (CHEOPS) Open
The CHaracterizing ExOPlanet Satellite (CHEOPS) is set to be launched in December 2019 and will detect and characterize small size exoplanets via ultra high precision photometry during transits. CHEOPS is designed as a follow-up telescope …
View article: Expected performances of the Characterising Exoplanet Satellite (CHEOPS) III. Data reduction pipeline: architecture and simulated performances
Expected performances of the Characterising Exoplanet Satellite (CHEOPS) III. Data reduction pipeline: architecture and simulated performances Open
The CHaracterizing ExOPlanet Satellite (CHEOPS), to be launched in December 2019, will detect and characterize small size exoplanets via ultra high precision photometry during transits. CHEOPS is designed as a follow-up telescope and there…
View article: Planets, candidates, and binaries from the CoRoT/Exoplanet programme: The CoRoT transit catalogue
Planets, candidates, and binaries from the CoRoT/Exoplanet programme: The CoRoT transit catalogue Open
The CoRoT space mission observed 163 665 stars over 26 stellar fields in the faint star channel. The exoplanet teams detected a total of 4123 transit-like features in the 177 454 light curves. We present the complete re-analysis of all the…
View article: II.3 Exposure based algorithm for removing systematics out of the CoRoT light curves
II.3 Exposure based algorithm for removing systematics out of the CoRoT light curves Open
This book is dedicated to all the people interested in the CoRoT mission and the beautiful data that were delivered during its six year duration. Either amateurs, professional, young or senior researchers, they will find treasures not only…
View article: II.2 Description of processes and corrections from observation to delivery
II.2 Description of processes and corrections from observation to delivery Open
This book is dedicated to all the people interested in the CoRoT mission and the beautiful data that were delivered during its six year duration. Either amateurs, professional, young or senior researchers, they will find treasures not only…