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Biography

Professional biography

Jesper has worked at the Open University since 2015, where he started as a PostDoc creating a charge transfer simulation code for the CCDs for the VIS instrument on the ESA Euclid mission. in 2017 he became a Research Fellow with responsibility for the whole data analysis part of the Euclid VIS radiation damage campaign, working especially on the trap pumping method and analysis. He is now leading the trap pumping definition and analysis that will be performed as part of the in-orbit calibration routines for Euclid VIS.

He is also working on a number of other projects involving detector simulation, testing and development. This includes work on the radiation damage of the detectors on the Gaia space telescope, detector testing for the Canadian UV telescope CASTOR and NASA's Habitable Worlds Observatory (HWO), and building a setup for doing UV Quantum Efficiency measurements.

Jesper did his PhD in Astronomy at the Niels Bohr Institute at Copenhagen University in Denmark. Here he worked on an Electron Multiplying CCD instrument and was responsible for the for the instrument control software and data analysis software, and did the installation and testing of the instrument at the Danish 1.54m Telescope in Chile. Using this instrument he, among other things, worked on stellar variability studies of Galactic globular clusters, and is involved in the search for exoplanets using the gravitational microlensing method.

Research interests

  • Detector testing and analysis
  • Radiation damage
  • Trap pumping technique
  • CCD and CMOS technologies
  • UV QE measurements

Projects

Euclid PLS 25 - 6 month bridge funding

Euclid UK Science Ground Segment Bridging Grant Phase III - Post Launch Support Apr24 to Mar25

CASTOR:UK - Oct 23 - Mar 25

UK involvement in the Nancy Grace Roman Space Telescope: Promoting UK EMCCD technology and UK science strengths into future global space applications

Radiation damage in detectors: what really happens to silicon imaging detectors in orbit?

Euclid UK Science Ground Segment Bridging Grant Phase III

STFC IAA 2018

ESA NPI Gaia radiation damage

Euclid SGS 21-22

Publications

Journal Article

Shape and spin state model of contact binary (388188) 2006 DP14using combined radar and optical observations (2025)

Euclid : Detecting Solar System objects in Euclid images and classifying them using Kohonen self-organising maps (2025)

Euclid preparation : LX. The use of HST images as input for weak-lensing image simulations (2025)

Euclid: High-precision imaging astrometry and photometry from Early Release Observations: I. Internal kinematics of NGC6397 by combining Euclid and Gaia data (2024)

Euclid: The rbM* relation as a function of redshift : I. The 5 × 109 M black hole in NGC 1272 (2024)

Investigation of an irradiated CCD device: Building and testing a Charge Transfer Inefficiency correction pipeline using the Pyxel framework (2024)

Euclid: Testing photometric selection of emission-line galaxy targets (2024)

Absolute dimensions of solar-type eclipsing binaries: NY Hya: A test for magnetic stellar evolution models (2024)

Gaia21blx: Complete resolution of a binary microlensing event in the Galactic disk (2024)

Star-spot activity, orbital obliquity, transmission spectrum, physical properties, and transit time variations of the HATS-2 planetary system (2024)

Euclid : Improving the efficiency of weak lensing shear bias calibration : Pixel noise cancellation and the response method on trial (2024)

Euclid preparation : XXXVII. Galaxy colour selections with Euclid and ground photometry for cluster weak-lensing analyses (2024)

Euclid preparation: XXXI. The effect of the variations in photometric passbands on photometric-redshift accuracy (2024)

Euclid preparation : XLVIII. The pre-launch Science Ground Segment simulation framework (2024)

Digging deeper into the dense Galactic globular cluster Terzan 5 with electron-multiplying CCDs: Variable star detection and new discoveries (2024)

Optical Monitoring of the Didymos–Dimorphos Asteroid System with the Danish Telescope around the DART Mission Impact (2023)

OGLE-2019-BLG-0825: Constraints on the Source System and Effect on Binary-lens Parameters Arising from a Five-day Xallarap Effect in a Candidate Planetary Microlensing Event (2023)

Euclid preparation: XXVII. A UV–NIR spectral atlas of compact planetary nebulae for wavelength calibration (2023)

Euclid preparation. XXVI. The Euclid Morphology Challenge: Towards structural parameters for billions of galaxies (2023)

Euclid preparation. XXV. The Euclid Morphology Challenge: Towards model-fitting photometry for billions of galaxies (2023)

Euclid preparation. XXIX: Water ice in spacecraft Part I: The physics of ice formation and contamination (2023)

Surface Passivation by Quantum Exclusion: On the Quantum Efficiency and Stability of Delta-Doped CCDs and CMOS Image Sensors in Space (2023)

Physical properties of near-Earth asteroid (2102) Tantalus from multi-wavelength observations (2022)

Modelling the impact of radiation damage effects in in-flight and on-ground irradiated Gaia CCDs (2022)

An Isolated Stellar-mass Black Hole Detected through Astrometric Microlensing (2022)

Precision measurement of a brown dwarf mass in a binary system in the microlensing event (2022)

Euclid preparation: I. The Euclid Wide Survey (2022)

A search for transit timing variations in the HATS-18 planetary system (2022)

Understanding the evolution of radiation damage on the Gaia CCDs after 72 months at L2 (2022)

Euclid preparation: XVI. Exploring the ultra-low surface brightness Universe with Euclid/VIS (2022)

Refined physical parameters for Chariklo’s body and rings from stellar occultations observed between 2013 and 2020 (2021)

OGLE-2018-BLG-1185b: A Low-mass Microlensing Planet Orbiting a Low-mass Dwarf (2021)

Six Outbursts of Comet 46P/Wirtanen (2021)

OGLE-2017-BLG-0406: Spitzer Microlens Parallax Reveals Saturn-mass Planet Orbiting M-dwarf Host in the Inner Galactic Disk (2020)

Spitzer Microlensing Parallax Reveals Two Isolated Stars in the Galactic Bulge (2020)

OGLE-2013-BLG-0911Lb: A Secondary on the Brown-dwarf Planet Boundary around an M Dwarf (2020)

Large-scale changes of the cloud coverage in the ε Indi Ba,Bb system (2020)

OGLE-2017-BLG-1186: first application of asteroseismology and Gaussian processes to microlensing (2019)

A pair of temperate sub-Neptunes transiting the star EPIC 212737443 (2019)

OGLE-2018-BLG-0022: A Nearby M-dwarf Binary (2019)

OGLE-2014-BLG-1186: gravitational microlensing providing evidence for a planet orbiting the foreground star or for a close binary source? (2019)

Spitzer Microlensing Parallax for OGLE-2017-BLG-0896 Reveals a Counter-rotating Low-mass Brown Dwarf (2019)

The mass and age of the first SONG target: the red giant 46 LMi (2018)

Importance of charge capture in interphase regions during readout of charge-coupled devices (2018)

OGLE-2017-BLG-1434Lb: Eighth q (2018)

High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). II. Lucky Imaging results from 2015 and 2016 (2018)

The SMILE Soft X-ray Imager (SXI) CCD design and development (2018)

GravityCam: Wide-field high-resolution high-cadence imaging surveys in the visible from the ground (2018)

OGLE-2016-BLG-1190Lb: The First Spitzer Bulge Planet Lies Near the Planet/Brown-dwarf Boundary (2018)

Trap pumping schemes for the Euclid CCD273 detector: characterisation of electrodes and defects (2017)

Improving radiation hardness in space-based Charge-Coupled Devices through the narrowing of the charge transfer channel (2017)

Evolution and impact of defects in a p-channel CCD after cryogenic proton-irradiation (2017)

Faint-source-star planetary microlensing: the discovery of the cold gas-giant planet OGLE-2014-BLG-0676Lb (2017)

Comparing simulations and test data of a radiation damaged charge-coupled device for the Euclid mission (2017)

First Results from the Hertzsprung SONG Telescope: Asteroseismology of the G5 Subgiant Star μ Herculis (2017)

Orbital alignment and star-spot properties in the WASP-52 planetary system (2017)

MiNDSTEp differential photometry of the gravitationally lensed quasars WFI 2033-4723 and HE 0047-1756: microlensing and a new time delay (2017)

Campaign 9 of the K2 Mission: Observational Parameters, Scientific Drivers, and Community Involvement for a Simultaneous Space- and Ground-based Microlensing Survey (2016)

The First Simultaneous Microlensing Observations by Two Space Telescopes: Spitzer and Swift Reveal a Brown Dwarf in Event OGLE-2015-BLG-1319 (2016)

OGLE-2015-BLG-0479LA,B: Binary Gravitational Microlens Characterized By Simultaneous Ground-Based and Space-Based Observations (2016)

Many new variable stars discovered in the core of the globular cluster NGC 6715 (M 54) with EMCCD observations (2016)

High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). I. Lucky imaging observations of 101 systems in the southern hemisphere (2016)

High-precision photometry by telescope defocussing – VIII. WASP-22, WASP-41, WASP-42 and WASP-55 (2016)

Estimating the parameters of globular cluster M 30 (NGC 7099) from time-series photometry (Corrigendum) (2016)

Exploring the crowded central region of ten Galactic globular clusters using EMCCDs (2016)

Spitzer Observations of OGLE-2015-BLG-1212 Reveal a New Path toward Breaking Strong Microlens Degeneracies (2016)

MOA-2011-BLG-028Lb: A Neptune-Mass Microlensing Planet in the Galactic Bulge (2016)

Spitzer parallax of OGLE-2015-BLG-0966: a cold Neptune in the Galactic disk (2016)

Physical properties of the planetary systems WASP-45 and WASP-46 from simultaneous multiband photometry (2016)

Erratum: A detailed census of variable stars in the globular cluster NGC 6333 (M9) from CCD differential photometry (2016)

The Spitzer Microlensing Program as a Probe for Globular Cluster Planets: Analysis of OGLE-2015-BLG-0448 (2016)

Mass Measurements of Isolated Objects from Space-Based Microlensing (2016)

Larger and faster: revised properties and a shorter orbital period for the WASP-57 planetary system from a pro-am collaboration (2015)

Rotation periods and astrometric motions of the Luhman 16AB brown dwarfs by high-resolution lucky-imaging monitoring (2015)

Spitzer microlens measurement of a massive remnant in a well-separated binary (2015)

Red noise versus planetary interpretations in the microlensing event OGLE-2013-BLG-446 (2015)

Pluto's atmosphere from stellar occultations in 2012 and 2013 (2015)

Transits and starspots in the WASP-6 planetary system (2015)

A census of variability in globular cluster M 68 (NGC 4590) (2015)

Pathway to the galactic distribution of planets: combined Spitzer and ground-based microlens parallax measurements of 21 single-lens events (2015)

Ogle-2011-BLG-0265LB: a jovian microlensing planet orbiting an M dwarf (2015)

The two-colour EMCCD instrument for the Danish 1.54 m telescope and SONG (2015)

Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations (2015)

High-precision photometry by telescope defocusing - VII. The ultrashort period planet WASP-103 (2014)

High-precision photometry by telescope defocussing - VI. WASP-24, WASP-25 and WASP-26 (2014)

A ring system detected around the Centaur (10199) Chariklo (2014)

Physical properties and transmission spectrum of the WASP-80 planetary system from multi-colour photometry (2014)

A super-Jupiter orbiting a late-type star: a refined analysis of microlensing event OGLE-2012-BLG-0406 (2014)

Physical properties of the WASP-67 planetary system from multi-colour photometry (2014)

Physical properties, transmission and emission spectra of the WASP-19 planetary system from multi-colour photometry (2013)

High-precision photometry by telescope defocusing - V. WASP-15 and WASP-16 (2013)

EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981 (2013)

Microlensing discovery of a population of very tight, very low mass binary brown dwarfs (2013)

A giant planet beyond the snow line in microlensing event OGLE-2011-BLG-0251 (2013)

Flux and color variations of the doubly imaged quasar UM673 (2013)

Estimating the parameters of globular cluster M 30 (NGC 7099) from time-series photometry (2013)

A detailed census of variable stars in the globular cluster NGC 6333 (M9) from CCD differential photometry (2013)

The transiting system GJ1214: high-precision defocused transit observations and a search for evidence of transit timing variation (2013)

Microlensing binaries with candidate brown dwarf companions (2012)

A brown dwarf orbiting an M-dwarf: MOA 2009–BLG–411L (2012)

High-precision photometry by telescope defocusing - IV. Confirmation of the huge radius of WASP-17 b (2012)

A new type of ambiguity in the planet and binary interpretations of central perturbations of high-magnification gravitational microlensing events (2012)

Characterizing low-mass binaries from observation of long-timescale caustic-crossing gravitational microlensing events (2012)

Characterizing lenses and lensed stars of high-magnification single-lens gravitational microlensing events with lenses passing over source stars (2012)

Microlensing binaries discovered through high-magnification channel (2012)

Discovery and mass measurements of a cold, 10 Earth mass planet and its host star (2011)

MOA-2009-BLG-387Lb: a massive planet orbiting an M dwarf (2011)

Flux and color variations of the quadruply imaged quasar HE 0435-1223 (2011)

A sub-Saturn mass planet, MOA-2009-BLG-319Lb (2011)

High-precision photometry by telescope defocusing - III. The transiting planetary system WASP-2★ (2010)

OGLE-2009-BLG-092/MOA-2009-BLG-137: a dramatic repeating event with the second perturbation predicted by real-time analysis (2010)

Physical properties of the 0.94-day period transiting planetary system WASP-18 (2009)

Presentation / Conference

Tracking radiation damage of Euclid VIS detectors after 1 year in space (2024)

Evaluating UV detector enhancement technologies for the next generation of space telescopes: the path to CASTOR (2024)

Assessing the suitability of CIS220 for low light astronomy (2024)

2D-doped silicon detectors for UV/optical/NIR and x-ray astronomy (2022)

Modelling charge transfer inefficiency in Gaia CCDs with in-flight and on-ground data (2022)

Calibrating and correcting charge transfer inefficiency in CCDs using Pyxel (2022)

Gaia CCDs: charge transfer inefficiency measurements between five years of flight (2020)

C3TM: CEI CCD charge transfer model for radiation damage analysis and testing (2018)

GravityCam: higher resolution visible wide-field imaging (2018)

VIS: the visible imager for Euclid (2018)

Mapping radiation-induced defects in CCDs through space and time (2016)

Comparing simulations and test data of a radiation damaged CCD for the Euclid mission (2016)

VIS: the visible imager for Euclid (2016)

The effect of radiation-induced traps on the WFIRST coronagraph detectors (2016)