Publications (127)
An angular-selective electron source for the KATRIN experiment
M. Beck, K. Bokeloh, H. Hein +10
The KATRIN experiment is going to search for the average mass of the electron antineutrino with a sensitivity of 0.2 eV/c2. It uses a retardation spectrometer of MAC-E filter type…
Refined parameters of the HD 22946 planetary system and the true orbital period of planet d
Z. Garai, H. P. Osborn, D. Gandolfi +85
Multi-planet systems are important sources of information regarding the evolution of planets. However, the long-period planets in these systems often escape detection. HD 22946 is…
Limits on the release of Rb isotopes from a zeolite based 83mKr calibration source for the XENON project
V. Hannen, E. Aprile, F. Arneodo +12
The isomer 83mKr with its half-life of 1.83 h is an ideal calibration source for a liquid noble gas dark matter experiment like the XENON project. However, the risk of contaminatio…
Characterization of the HD 108236 system with CHEOPS and TESS. Confirmation of a fifth transiting planet
S. Hoyer, A. Bonfanti, A. Leleu +87
The HD108236 system was first announced with the detection of four small planets based on TESS data. Shortly after, the transit of an additional planet with a period of 29.54d was…
A transit survey to search for planets around hot subdwarfs: I. methods and performance tests on light curves from Kepler, K2, TESS, and CHEOPS
V. Van Grootel, F. J. Pozuelos, A. Thuillier +79
Context. Hot subdwarfs experienced strong mass loss on the Red Giant Branch (RGB) and are now hot and small He-burning objects. Aims. In this project we aim to perform a transit su…
The hot dayside and asymmetric transit of WASP-189b seen by CHEOPS
M. Lendl, Sz. Csizmadia, A. Deline +102
The CHEOPS space mission dedicated to exoplanet follow-up was launched in December 2019, equipped with the capacity to perform photometric measurements at the 20 ppm level. As CHEO…
Automated classification of Hipparcos unsolved variables
L. Rimoldini, P. Dubath, M. Süveges +14
We present an automated classification of stars exhibiting periodic, non-periodic and irregular light variations. The Hipparcos catalogue of unsolved variables is employed to compl…
Spin pairs in a weakly coupled many-electron quantum dot
S. Hellmüller, D. Bischoff, T. Müller +3
We report the observation of an unusually large number of consecutive spin pairs in a weakly coupled many-electron GaAs/AlGaAs quantum dot. The pairs are identified due to pairwise…
An intermittent extreme BL Lac: MWL study of 1ES 2344+514 in an enhanced state
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +215
Extreme High-frequency BL~Lacs (EHBL) feature their synchrotron peak of the broadband spectral energy distribution (SED) at 10\,Hz. The BL~Lac object 1ES~2…
Analysis of Early Science observations with the CHaracterising ExOPlanets Satellite (CHEOPS) using pycheops
P. F. L. Maxted, D. Ehrenreich, T. G. Wilson +77
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…
Negative free carrier absorption in terahertz quantum cascade lasers
C. Ndebeka-Bandou, M. Rösch, K. Ohtani +2
We analyze the peculiar case where the free carrier absorption arising from LO phonon absorption-assisted transitions becomes negative and therefore turns into a gain source for qu…
Ultra-stable implanted 83Rb/83mKr electron sources for the energy scale monitoring in the KATRIN experiment
M. ZboÅil, S. Bauer, M. Beck +13
The KATRIN experiment aims at the direct model-independent determination of the average electron neutrino mass via the measurement of the endpoint region of the tritium beta decay…
The phase curve and the geometric albedo of WASP-43b measured with CHEOPS, TESS and HST WFC3/UVIS
G. Scandariato, V. Singh, D. Kitzmann +79
Observations of the phase curves and secondary eclipses of extrasolar planets provide a window on the composition and thermal structure of the planetary atmospheres. For example, t…
Two-well quantum cascade laser optimization by non-equilibrium Green's function modelling
M. Franckié, L. Bosco, M. Beck +5
We present a two-quantum well THz intersubband laser operating up to 192 K. The structure has been optimized with a non-equilibrium Green's function model. The result of this optim…
A CHEOPS-enhanced view of the HD3167 system
V. Bourrier, A. Deline, A. Krenn +92
Much remains to be understood about the nature of exoplanets smaller than Neptune, most of which have been discovered in compact multi-planet systems. With its inner ultra-short pe…
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…
CHEOPS in-flight performance: A comprehensive look at the first 3.5 years of operations
A. Fortier, A. E. Simon, C. Broeg +128
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 exc…
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…
CHEOPS observations of KELT-20 b/MASCARA-2 b: An aligned orbit and signs of variability from a reflective dayside
V. Singh, G. Scandariato, A. M. S. Smith +87
Occultations are windows of opportunity to indirectly peek into the dayside atmosphere of exoplanets. High-precision transit events provide information on the spin-orbit alignment…
Observation of a resonance in the Kp decay channel at a mass of 1765 MeV/c
WA89 Collaboration, M. I. Adamovich, Yu. A. Alexandrov +60
We report on the observation of a Kp resonance signal at a mass of 17655 MeV/c, with intrinsic width MeV/c, produced inclusively in -nucleus…
Muon-induced background in the KATRIN main spectrometer
K. Altenmüller, M. Arenz, W. -J. Baek +131
The KArlsruhe TRItium Neutrino (KATRIN) experiment aims to make a model-independent determination of the effective electron antineutrino mass with a sensitivity of 0.2 eV/c.…
55 Cancri e's occultation captured with CHEOPS
B. -O. Demory, S. Sulis, E. Meier Valdes +73
Past occultation and phase-curve observations of the ultra-short period super-Earth 55 Cnc e obtained at visible and infrared wavelengths have been challenging to reconcile with a…
Six transiting planets and a chain of Laplace resonances in TOI-178
A. Leleu, Y. Alibert, N. C. Hara +152
Determining the architecture of multi-planetary systems is one of the cornerstones of understanding planet formation and evolution. Resonant systems are especially important as the…
High efficiency deterministic Josephson Vortex Ratchet
M. Beck, E. Goldobin, M. Neuhaus +3
We investigate experimentally a Josephson vortex ratchet -- a fluxon in an asymmetric periodic potential driven by a deterministic force with zero time average. The highly asymmetr…
CHEOPS and TESS view of the ultra-short period super-Earth TOI-561 b
J. A. Patel, J. A. Egger, T. G. Wilson +75
Ultra-short period planets (USPs) are a unique class of super-Earths with an orbital period of less than a day and hence subject to intense radiation from their host star. While mo…
Self-consistent state and measurement tomography with fewer measurements
A. Stephens, J. M. Cutshall, T. McPhee +1
We describe a technique for self consistently characterizing both the quantum state of a single qubit system, and the positive-operator-valued measure (POVM) that describes measure…
Experimental demonstration of loop state-preparation-and-measurement tomography
A. F. McCormick, S. J. van Enk, M. Beck
We have performed an experiment demonstrating that loop state-preparation-and-measurement (SPAM) tomography [C. Jackson and S. J. van Enk, Phys. Rev. A 92, 042312 (2015)] is capabl…
The INTEGRAL Burst Alert System: Results and Future Perspectives
S. Mereghetti, D. Gotz, J. Borkowski +3
The INTEGRAL Burst Alert System (IBAS) is the software for real time detection of Gamma Ray Bursts (GRBs) and the rapid distribution of their coordinates. IBAS has been running alm…
The EBLM Project XI. Mass, radius and effective temperature measurements for 23 M-dwarf companions to solar-type stars observed with CHEOPS
M. I. Swayne, P. F. L. Maxted, A. H. M. J. Triaud +104
Observations of low-mass stars have frequently shown a disagreement between observed stellar radii and radii predicted by theoretical stellar structure models. This ``radius inflat…
Transit timing variations of AU Microscopii b and c
Gy. M. Szabó, Z. Garai, A. Brandeker +76
Here we report large-amplitude transit timing variations (TTVs) for AU\,Microcopii b and c as detected in combined TESS (2018, 2020) and CHEOPS (2020, 2021) transit observations. A…
Using Localized Twitter Activity for Red Tide Impact Assessment
A. Skripnikov, N. Wagner, J. Shafer +3
Red tide blooms of the dinoflagellate Karenia brevis (K. brevis) produce toxic coastal conditions that can impact marine organisms and human health, while also affecting local econ…
The Design, Construction, and Commissioning of the KATRIN Experiment
M. Aker, K. Altenmüller, J. F. Amsbaugh +226
The KArlsruhe TRItium Neutrino (KATRIN) experiment, which aims to make a direct and model-independent determination of the absolute neutrino mass scale, is a complex experiment wit…
Coefficients and Roots of Ehrhart Polynomials
M. Beck, J. A. De Loera, M. Develin +2
The Ehrhart polynomial of a convex lattice polytope counts integer points in integral dilates of the polytope. We present new linear inequalities satisfied by the coefficients of E…
Detecting correlated errors in twin-field quantum key distribution
B. Panchumarthi, A. Stephens, M. Beck
We experimentally demonstrate that we can detect correlated errors in a twin-field quantum key distribution (TFQKD) system by using a technique that is related to self-consistent t…
The WITCH Experiment: towards weak interactions studies. Status and prospects
V. Yu. Kozlov, M. Beck, S. Coeck +8
Primary goal of the WITCH experiment is to test the Standard Model for a possible ad-mixture of a scalar or tensor type interaction in beta-decay. This information will be inferred…
TOI-1055 b: Neptunian planet characterised with HARPS, TESS, and CHEOPS
A. Bonfanti, D. Gandolfi, J. A. Egger +89
TOI-1055 is a Sun-like star known to host a transiting Neptune-sized planet on a 17.5-day orbit (TOI-1055 b). Radial velocity (RV) analyses carried out by two independent groups us…
The stable climate of KELT-9b
K. D. Jones, B. M. Morris, B. -O. Demory +76
Even among the most irradiated gas giants, so-called ultra-hot Jupiters, KELT-9b stands out as the hottest planet thus far discovered with a dayside temperature of over 4500K. At t…
Spi-OPS: Spitzer and CHEOPS confirm the near-polar orbit of MASCARA-1 b and reveal a hint of dayside reflection
M. J. Hooton, S. Hoyer, D. Kitzmann +82
The light curves of tidally locked hot Jupiters transiting fast-rotating, early-type stars are a rich source of information about both the planet and star, with full-phase coverage…
The WITCH experiment: Acquiring the first recoil ion spectrum
V. Yu. Kozlov, M. Beck, S. Coeck +12
The standard model of the electroweak interaction describes beta-decay in the well-known V-A form. Nevertheless, the most general Hamiltonian of a beta-decay includes also other po…
Constraining the reflective properties of WASP-178b using Cheops photometry
I. Pagano, G. Scandariato, V. Singh +79
Multiwavelength photometry of the secondary eclipses of extrasolar planets is able to disentangle the reflected and thermally emitted light radiated from the planetary dayside. Thi…
TOI-5678 b: A 48-day transiting Neptune-mass planet characterized with CHEOPS and HARPS
S. Ulmer-Moll, H. P. Osborn, A. Tuson +92
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…
The tidal deformation and atmosphere of WASP-12b from its phase curve
B. Akinsanmi, S. C. C. Barros, M. Lendl +85
Ultra-hot Jupiters present a unique opportunity to understand the physics and chemistry of planets at extreme conditions. WASP-12b stands out as an archetype of this class of exopl…
Room Temperature Operation of a Buried Heterostructure Photonic Crystal Quantum Cascade Laser
R. Peretti, V. Liverini, J. M. Wolf +6
High power single mode quantum cascade lasers with a narrow far field are important for several applications including surgery or military countermeasure. Existing technologies suf…
Irreversibility on the Level of Single-Electron Tunneling
B. Küng, C. Rössler, M. Beck +5
We present a low-temperature experimental test of the fluctuation theorem for electron transport through a double quantum dot. The rare entropy-consuming system trajectories are de…
The changing face of AU Mic b: stellar spots, spin-orbit commensurability, and Transit Timing Variations as seen by CHEOPS and TESS
Gy. M. Szabó, D. Gandolfi, A. Brandeker +78
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…
Positron-neutrino correlation in the 0^+ \to 0^+ decay of ^{32}Ar
E. G. Adelberger, C. Ortiz, A. Garcia +7
The positron-neutrino correlation in the decay of Ar was measured at ISOLDE by analyzing the effect of lepton recoil on the shape of the narrow proton group…
Melting the Superconducting State in the Electron Doped Cuprate PrCeCuO with Intense near-infrared and Terahertz Pulses
M. Beck, M. Klammer, I. Rousseau +8
We studied the superconducting (SC) state depletion process in an electron doped cuprate PrCeCuO by pumping with near-infrared (NIR) and narrow-band THz…
V2:Performance of the solid deuterium ultra-cold neutron source at the pulsed reactor TRIGA Mainz
J. Karch, Yu. Sobolev, M. Beck +7
The performance of the solid deuterium ultra-cold neutron source at the pulsed reactor TRIGA Mainz with a maximum peak energy of 10 MJ is described. The solid deuterium converter w…
Protective measurements of photon polarization using a temporal pointer
Meng-Wei Chen, Owen Young, Maximilian Schlosshauer +1
We experimentally demonstrate protective measurements by weakly coupling the polarization of a single-photon-level field to a measurement pointer that corresponds to the arrival ti…
Commissioning of the vacuum system of the KATRIN Main Spectrometer
M. Arenz, M. Babutzka, M. Bahr +147
The KATRIN experiment will probe the neutrino mass by measuring the beta-electron energy spectrum near the endpoint of tritium beta-decay. An integral energy analysis will be perfo…
Characterisation of the TOI-421 planetary system using CHEOPS, TESS, and archival radial velocity data
A. F. Krenn, D. Kubyshkina, L. Fossati +88
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…
Hint of an exocomet transit in the CHEOPS lightcurve of HD 172555
F. Kiefer, V. Van Grootel, A. Lecavelier des Etangs +72
HD172555 is a young (20Myr) A7V star surrounded by a 10au wide debris disk suspected to be replenished partly by collisions between large planetesimals. Small eva…
Mixing properties of room temperature patch-antenna receivers in a mid-infrared (9um) heterodyne system
A. Bigioli, D. Gacemi, D. Palaferri +10
A room-temperature mid-infrared (9 um) heterodyne system based on high-performance unipolar optoelectronic devices is presented. The local oscillator (LO) is a quantum cascade lase…
Controlling and Phase-Locking a THz Quantum Cascade Laser Frequency Comb by Small Optical Frequency Tuning
L. Consolino, A. Campa, M. De Regis +7
Full phase control of THz emitting quantum cascade laser (QCL) combs has recently been demonstrated, opening new perspectives for even the most demanding applications. In this fram…
Pure Single Photons from Scalable Frequency Multiplexing
T. Hiemstra, T. F. Parker, P. C. Humphreys +7
We demonstrate multiphoton interference using a resource-efficient frequency multiplexing scheme, suitable for quantum information applications that demand multiple indistinguishab…
Dipole coupling of a double quantum dot to a microwave resonator
T. Frey, P. J. Leek, M. Beck +4
Quantum coherence in solid-state systems has been demonstrated in superconducting circuits and in semiconductor quantum dots. This has paved the way to investigate solid-state syst…
Ellipsometry with polarisation analysis at cryogenic temperatures inside a vacuum chamber
S. Bauer, B. Grees, D. Spitzer +9
In this paper we describe a new variant of null ellipsometry to determine thicknesses and optical properties of thin films on a substrate at cryogenic temperatures. In the PCSA arr…
Fundamental effective temperature measurements for eclipsing binary stars -- III. SPIRou near-infrared spectroscopy and CHEOPS photometry of the benchmark G0V star EBLM J0113+31
P. F. L. Maxted, N. J. Miller, S. Hoyer +74
EBLM J0113+31 is moderately bright (V=10.1), metal-poor ([Fe/H]) G0V star with a much fainter M dwarf companion on a wide, eccentric orbit (=14.3 d). We have used near…
The WITCH experiment: completion of a set-up to investigate the structure of weak interactions with a Penning trap
V. Yu. Kozlov, N. Severijns, D. Beck +10
The WITCH experiment aims to study a possible admixture of a scalar or tensor type interaction in beta decay by determining the beta-neutrino angular correlation from the shape of…
Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N and TESS
G. Lacedelli, T. G. Wilson, L. Malavolta +115
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 HARPS-N…
Gaia Data Release 1. Open cluster astrometry: performance, limitations, and future prospects
Gaia Collaboration, F. van Leeuwen, A. Vallenari +589
Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a subset of about 2 million stars for which, besides the position and photometry,…
Effect of a sweeping conductive wire on electrons stored in the Penning trap between the KATRIN spectrometers
M. Beck, K. Valerius, J. Bonn +8
The KATRIN experiment is going to search for the mass of the electron antineutrino down to 0.2 eV/c^2. In order to reach this sensitivity the background rate has to be understood a…
Loop State-preparation-and-measurement tomography of a two-qubit system
M. E. Feldman, G. K. Juul, S. J. Van Enk +1
We experimentally demonstrate that loop state-preparation-and-measurement (SPAM) tomography is capable of detecting correlated errors in a two-qubit system. We prepare photon pairs…
A UV LED-based fast-pulsed photoelectron source for time-of-flight studies
K. Valerius, M. Beck, H. Arlinghaus +7
We report on spectroscopy and time-of-flight measurements using an 18 keV fast-pulsed photoelectron source of adjustable intensity, ranging from single photoelectrons per pulse to…
A GEANT4 Monte-Carlo Simulation Code for precision beta spectroscopy
F. Wauters, I. Kraev, D. Zakoucky +8
The measurement of the beta asymmetry parameter in nuclear beta decay is a potentially very sensitive tool to search for non V-A components in the charge-changing weak interaction.…
Improved determination of the - angular correlation coefficient in free neutron decay with the SPECT spectrometer
M. Beck, F. Ayala Guardia, S. BaeÃler +15
We report on a precise measurement of the electron-antineutrino angular correlation ( coefficient) in free neutron beta-decay from the SPECT experiment. The coefficient i…
Multiwavelength variability and correlation studies of Mrk 421 during historically low X-ray and -ray activity in 20152016
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +224
We report a characterization of the multi-band flux variability and correlations of the nearby (z=0.031) blazar Markarian 421 (Mrk 421) using data from Metsähovi, Swift, Fermi-LAT…
Connecting photometric and spectroscopic granulation signals with CHEOPS and ESPRESSO
S. Sulis, M. Lendl, H. Cegla +83
Stellar granulation generates fluctuations in photometric and spectroscopic data whose properties depend on the stellar type, composition, and evolutionary state. In this study, we…
Detecting false correlations: Uncovering a faked Bell-inequality violation
M. E. Feldman, G. K. Juul, S. J. van Enk +1
It is possible for two parties, Alice and Bob, to establish a secure communication link by sharing an ensemble of entangled particles, and then using these particles to generate a…
Photoinduced melting of superconductivity in the high-Tc superconductor La2-xSrxCuO4 probed by time-resolved optical and THz techniques
M. Beyer, M. Beck, D. Städter +6
Dynamics of depletion and recovery of superconducting state in La2-xSrxCuO_4 thin films is investigated utilizing optical pump-probe and optical pump - THz probe techniques as a fu…
Calibration of high voltages at the ppm level by the difference of Kr conversion electron lines at the KATRIN experiment
M. Arenz, W. -J. Baek, M. Beck +124
The neutrino mass experiment KATRIN requires a stability of 3 ppm for the retarding potential at -18.6 kV of the main spectrometer. To monitor the stability, two custom-made ultra-…
Room-temperature transverse-electric polarized intersubband electroluminescence from InAs/AlInAs quantum dashes
V. Liverini, L. Nevou, F. Castellano +4
We report the observation of transverse electric polarized electroluminescence from InAs/AlInAs quantum dash quantum cascade structures up to room temperature. The emission is attr…
CHEOPS finds KELT-1b darker than expected in visible light: Discrepancy between the CHEOPS and TESS eclipse depths
H. Parviainen, T. G. Wilson, M. Lendl +78
Recent TESS-based studies have suggested that the dayside of KELT-1b, a strongly-irradiated brown dwarf, is significantly brighter in visible light than what would be expected base…
THz optical beat-note detection with a fast Hot Electron Bolometer operating up to 31 GHz
G. Torrioli, A. Forrer, M. Beck +10
We study the performance of an hot-electron bolometer (HEB) operating at THz frequencies based on superconducting niobium nitride films. We report on the voltage response of the de…
Reduction of stored-particle background by a magnetic pulse method at the KATRIN experiment
KATRIN Collaboration, M. Arenz, W. -J. Baek +127
The KATRIN experiment aims to determine the effective electron neutrino mass with a sensitivity of (90\% C.L.) by precision measurement of the shape of the t…
Tests of the standard electroweak model in beta decay
N. Severijns, M. Beck, O. Naviliat-Cuncic
We review the current status of precision measurements in allowed nuclear beta decay, including neutron decay, with emphasis on their potential to look for new physics beyond the s…
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…
Superconducting complementary metasurfaces for THz ultrastrong light-matter coupling
G. Scalari, C. Maissen, S. Cibella +5
A superconducting metasurface operating in the THz range and based on the complementary metamaterial approach is discussed. Experimental measurements as a function of temperature a…
An improved upper limit on the neutrino mass from a direct kinematic method by KATRIN
M. Aker, K. Altenmüller, M. Arenz +205
We report on the neutrino mass measurement result from the first four-week science run of the Karlsruhe Tritium Neutrino experiment KATRIN in spring 2019. Beta-decay electrons from…
Hipparcos Variable Star Detection and Classification Efficiency
P. Dubath, I. Lecoeur-Taïbi, L. Rimoldini +14
A complete periodic star extraction and classification scheme is set up and tested with the Hipparcos catalogue. The efficiency of each step is derived by comparing the results wit…
Quantum dot admittance probed at microwave frequencies with an on-chip resonator
T. Frey, P. J. Leek, M. Beck +5
We present microwave frequency measurements of the dynamic admittance of a quantum dot tunnel coupled to a two-dimensional electron gas. The measurements are made via a high-qualit…
A full transit of Lupi d and the search for an exomoon in its Hill sphere with CHEOPS
D. Ehrenreich, L. Delrez, B. Akinsanmi +90
The planetary system around the naked-eye star Lupi (HD 136352; TOI-2011) is composed of three exoplanets with masses of 4.7, 11.2, and 8.6 Earth masses. The TESS and CHEOPS…
Characterising TOI-732 b and c: New insights into the M-dwarf radius and density valley
A. Bonfanti, M. Brady, T. G. Wilson +88
TOI-732 is an M dwarf hosting two transiting planets that are located on the two opposite sides of the radius valley. By doubling the number of available space-based observations a…
The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve
A. Deline, M. J. Hooton, M. Lendl +83
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 atmo…
Gaia Data Release 1: The variability processing & analysis and its application to the south ecliptic pole region
L. Eyer, N. Mowlavi, D. W. Evans +70
The ESA Gaia mission provides a unique time-domain survey for more than one billion sources brighter than G=20.7 mag. Gaia offers the unprecedented opportunity to study variability…
Highly Tunable Hybrid Quantum Dots with Charge Detection
C. Rössler, B. Küng, S. Dröscher +4
In order to employ solid state quantum dots as qubits, both a high degree of control over the confinement potential as well as sensitive charge detection are essential. We demonstr…
Investigating the visible phase-curve variability of 55 Cnc e
E. A. Meier Valdés, B. M. Morris, B. -O. Demory +87
55 Cnc e is an ultra-short period super-Earth transiting a Sun-like star. Previous observations in the optical range detected a time-variable flux modulation that is phased with th…
Prototype of an angular-selective photoelectron calibration source for the KATRIN experiment
K. Valerius, H. Hein, H. Baumeister +8
The method of direct neutrino mass determination based on the kinematics of tritium beta decay, which is adopted by the KATRIN experiment, makes use of a large, high-resolution ele…
Gaia Data Release 1. Testing the parallaxes with local Cepheids and RR Lyrae stars
Gaia Collaboration, G. Clementini, L. Eyer +588
Parallaxes for 331 classical Cepheids, 31 Type II Cepheids and 364 RR Lyrae stars in common between Gaia and the Hipparcos and Tycho-2 catalogues are published in Gaia Data Release…
Measurement of the Quantum Efficiency of Hamamatsu R8520 Photomultipliers at Liquid Xenon Temperature
E. Aprile, M. Beck, K. Bokeloh +12
Vacuum ultraviolet light sensitive photomultiplier tubes directly coupled to liquid xenon are being used to efficiently detect the 178 nm scintillation light in a variety of liquid…
Characterization of a microwave frequency resonator via a nearby quantum dot
T. Frey, P. J. Leek, M. Beck +3
We present measurements of a hybrid system consisting of a microwave transmission-line resonator and a lateral quantum dot defined on a GaAs heterostructure. The two subsystems are…
Comparison of ultracold neutron sources for fundamental physics measurements
G. Bison, M. Daum, K. Kirch +20
Ultracold neutrons (UCNs) are key for precision studies of fundamental parameters of the neutron and in searches for new CP violating processes or exotic interactions beyond the St…
The EBLM project -- VIII. First results for M-dwarf mass, radius and effective temperature measurements using CHEOPS light curves
M. I. Swayne, P. F. L. Maxted, A. H. M. J. Triaud +93
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 r…
Experimental Quantum State Tomography of Optical Fields and Ultrafast Statistical Sampling
M. G. Raymer, M. Beck
We review experimental work on the measurement of the quantum state of optical fields, and the relevant theoretical background. The basic technique of optical homodyne tomography i…
The HD 93963 A transiting system: A 1.04d super-Earth and a 3.65 d sub-Neptune discovered by TESS and CHEOPS
L. M. Serrano, D. Gandolfi, S. Hoyer +109
We present the discovery of two small planets transiting HD 93963A (TOI-1797), a G0\,V star (M=1.109\,\,0.043\,M, R=1.043\,\,0.009\,R) in a visual…
A new dynamical modeling of the WASP-47 system with CHEOPS observations
V. Nascimbeni, L. Borsato, T. Zingales +80
Among the hundreds of known hot Jupiters (HJs), only five have been found to have companions on short-period orbits. Within this rare class of multiple planetary systems, the archi…
Discovery of TOI-1260d and the characterisation of the multi-planet system
Kristine W. F. Lam, J. Cabrera, M. J. Hooton +83
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 days, re…
Random forest automated supervised classification of Hipparcos periodic variable stars
P. Dubath, L. Rimoldini, M. Süveges +14
We present an evaluation of the performance of an automated classification of the Hipparcos periodic variable stars into 26 types. The sub-sample with the most reliable variability…
CHEOPS geometric albedo of the hot Jupiter HD 209458b
A. Brandeker, K. Heng, M. Lendl +74
We report the detection of the secondary eclipse of the hot Jupiter HD 209458b in optical/visible light using the CHEOPS space telescope. Our measurement of 20.4 +/- 3.3 ppm transl…
CHEOPS observations of the HD 108236 planetary system: A fifth planet, improved ephemerides, and planetary radii
A. Bonfanti, L. Delrez, M. J. Hooton +106
The detection of a super-Earth and three mini-Neptunes transiting the bright ( = 9.2 mag) star HD 108236 (also known as TOI-1233) was recently reported on the basis of TESS and…