C.U. Keller

Latest

• A MUSE view of the asymmetric jet from HD 163296
• The vector-apodizing phase plate coronagraph: design, current performance, and future development
• A survey of the linear polarization of directly imaged exoplanets and brown dwarf companions with SPHERE-IRDIS. First polarimetric detections revealing disks around DH Tau B and GSC 6214-210 B
• PCS — A Roadmap for Exoearth Imaging with the ELT
• LOUPE: observing Earth from the Moon to prepare for detecting life on Earth-like exoplanets
• Focal plane wavefront sensing on SUBARU/SCExAO
• Searching for proto-planets with MUSE
• Self-optimizing adaptive optics control with reinforcement learning
• CS Cha B: A disc-obscured M-type star mimicking a polarised planetary companion
• On-sky verification of Fast and Furious focal-plane wavefront sensing: Moving forward toward controlling the island effect at Subaru/SCExAO
• The Single-mode Complex Amplitude Refinement (SCAR) coronagraph. II. Lab verification, and toward the characterization of Proxima b
• RefPlanets: Search for reflected light from extrasolar planets with SPHERE/ZIMPOL
• The Young Suns Exoplanet Survey: Detection of a wide-orbit planetary-mass companion to a solar-type Sco-Cen member
• Polarimetric imaging mode of VLT/SPHERE/IRDIS. I. Description, data reduction, and observing strategy
• Polarimetric imaging mode of VLT/SPHERE/IRDIS. II. Characterization and correction of instrumental polarization effects
• Focal-plane wavefront sensing with the vector-Apodizing Phase Plate
• Highly multiplexed Bragg gratings for large field of view gas sensing in planetary atmospheres
• Search for gas from the disintegrating rocky exoplanet K2-22b
• Polarimetric imaging of circumstellar disks. I. Artifacts due to limited angular resolution
• Two accreting protoplanets around the young star PDS 70
• Discovery of a directly imaged disk in scattered light around the Sco-Cen member Wray 15-788
• SPHERE/ZIMPOL high resolution polarimetric imager. I. System overview, PSF parameters, coronagraphy, and polarimetry
• Chromatic transit light curves of disintegrating rocky planets
• Laboratory verification of Fast & Furious phase diversity: Towards controlling the low wind effect in the SPHERE instrument
• BP Piscium: its flaring disc imaged with SPHERE/ZIMPOL$^★$
• The coronagraphic Modal Wavefront Sensor: a hybrid focal-plane sensor for the high-contrast imaging of circumstellar environments
• Direct detection of scattered light gaps in the transitional disk around HD 97048 with VLT/SPHERE
• Dusty tails of evaporating exoplanets. II. Physical modelling of the KIC 12557548b light curve
• Multiple rings in the transition disk and companion candidates around RX J1615.3-3255. High contrast imaging with VLT/SPHERE
• Search for an exosphere in sodium and calcium in the transmission spectrum of exoplanet 55 Cancri e
• Design trade-off and proof of concept for LOUPE, the Lunar Observatory for Unresolved Polarimetry of Earth
• Field Guide to Astronomical Instrumentation
• Use of neural networks in ground-based aerosol retrievals from multi-angle spectropolarimetric observations
• Unusual Stokes V profiles during flaring activity of a delta sunspot
• The effects of disk and dust structure on observed polarimetric images of protoplanetary disks
• No magnetic field in the spotted HgMn star ensuremathμ Leporis
• Fast horizontal flows in a quiet sun MHD simulation and their spectroscopic signatures
• Data-reduction techniques for high-contrast imaging polarimetry. Applications to ExPo
• Chemical spots in the absence of magnetic field in the binary HgMn star 66 Eridani
• First Detection of Linear Polarization in the Line Profiles of Active Cool Stars
• The search for magnetic fields in mercury-manganese stars
• Observations of solar scattering polarization at high spatial resolution
• Inversions of High-Cadence SOLIS-VSM Stokes Observations
• Statistics of Convective Collapse Events in the Photosphere and Chromosphere Observed with the HINODE SOT
• Statistics of convective collapse events in the photosphere and chromosphere observed with the Hinode SOT
• Vector Magnetic Field Inversions of High Cadence SOLIS-VSM Data
• Polarization Properties of Real Aluminum Mirrors, I. Influence of the Aluminum Oxide Layer
• Seething Horizontal Magnetic Fields in the Quiet Solar Photosphere
• On the Origin of Solar Faculae
• Linear Polarization Measurements of Chromospheric Emission Lines
• Spectroscopic Detection of the 3.934 Micron Line of Si IX in the Solar Corona
• Spatial mapping of the Hanle and Zeeman effects on the Sun
• The Advanced Technology Solar Telescope
• The Advanced Technology Solar Telescope
• The Advanced Technology Solar Telescope -- Science Goals and Instrument Description.
• Influence of magnetic fields on the coherence effects in the Na I D$_1$ and D$_2$ lines
• Results from a revisit to the K$_2V$ bright points
• New Initiatives for Synoptic Observations
• Anomalous polarization effects due to coherent scattering on the Sun
• Center-to-limb variation of the enigmatic NaI D_1 and D_2 polarization profiles
• Infrared lines as probes of solar magnetic features. XIV. TI i and the cool components of sunspots
• SOLIS: A Modern Facility for Synoptic Solar Observations
• Complex magnetic fields in an active region
• Differential Hanle effect and the spatial variation of turbulent magnetic fields on the Sun
• SOLIS - A Modern Facility for Synoptic Solar Observations
• The second solar spectrum. A new window for diagnostics of the Sun.
• Observations of the quiet Sun's magnetic field.
• Imaging Coronal Emission Lines under High Sky-Background Conditions
• Balloon-Borne Polarimetry
• Measurement of the full Stokes vector of He I 10830 ̊A
• Recent Progress in Imaging Polarimetry
• Direct measurements of flux tube inclinations in solar plages.
• Speckle spectrography of extended objects.
• The spectral hole-burning device: a 3-dimensional photon detector.
• Properties of Solar Magnetic Fields from Speckle Polarimetry. (Ludwig Biermann Award Lecture 1994)
• First light for an astronomical 3-D photon detector.
• Two-dimensional polarimeter with a charge-coupled-device image sensor and a piezoelastic modulator
• On the strength of solar intra-network fields.
• Resolution of magnetic flux tubes on the Sun
• Solar speckle polarimetry
• High Spatial Resolution Magnetograms of Solar Active Regions
• Zurich Imaging Stokes Polarimeter Zimpol-I - Design Review
• Multicolor Continuum Analysis of the Solar Granulation in Quiet and Active Regions
• Dependence of the properties of solar magnetic flux tubes on filling factor. II - Results of an inversion approach
• Solar magnetic field strength determinations from high spatial resolution filtergrams
• Structure of solar magnetic fluxtubes from the inversion of Stokes spectra at disk center