
Dr Jesper Skottfelt
Cei Fellow
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
Publications
Journal Article
Euclid preparation : LX. The use of HST images as input for weak-lensing image simulations (2025)
Euclid: Testing photometric selection of emission-line galaxy targets (2024)
Gaia21blx: Complete resolution of a binary microlensing event in the Galactic disk (2024)
Euclid preparation : XLVIII. The pre-launch Science Ground Segment simulation framework (2024)
Physical properties of near-Earth asteroid (2102) Tantalus from multi-wavelength observations (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)
OGLE-2018-BLG-1185b: A Low-mass Microlensing Planet Orbiting a Low-mass Dwarf (2021)
Six Outbursts of Comet 46P/Wirtanen (2021)
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)
A pair of temperate sub-Neptunes transiting the star EPIC 212737443 (2019)
OGLE-2018-BLG-0022: A Nearby M-dwarf Binary (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)
The SMILE Soft X-ray Imager (SXI) CCD design and development (2018)
Evolution and impact of defects in a p-channel CCD after cryogenic proton-irradiation (2017)
Orbital alignment and star-spot properties in the WASP-52 planetary system (2017)
Exploring the crowded central region of ten Galactic globular clusters using EMCCDs (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)
Mass Measurements of Isolated Objects from Space-Based Microlensing (2016)
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)
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)
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 of the WASP-67 planetary system from multi-colour photometry (2014)
High-precision photometry by telescope defocusing - V. WASP-15 and WASP-16 (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)
Microlensing binaries with candidate brown dwarf companions (2012)
A brown dwarf orbiting an M-dwarf: MOA 2009–BLG–411L (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)
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)
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)