T. A. van Kempen
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View article: Vicarious calibration as a method for inflight monitoring of atmospheric composition small-sat instrumentation
Vicarious calibration as a method for inflight monitoring of atmospheric composition small-sat instrumentation Open
Due to their dimensions and weight constraints, atmospheric composition small-sat missions typically lack onboard calibration capabilities, forcing them to resort to vicarious calibration methods. The sole instrument on the Sentinel-5 Prec…
View article: Analysing the flux stability of stellar calibrator candidates with TESS
Analysing the flux stability of stellar calibrator candidates with TESS Open
Context . The ESA space mission Ariel requires bright sources that are stable at the level of 100 ppm over 6 hours in order to accurately measure exoplanet atmospheres through transmission spectroscopy. To ensure this, in-flight instrument…
View article: Large Interferometer For Exoplanets (LIFE)
Large Interferometer For Exoplanets (LIFE) Open
Context . The increased brightness temperature of young rocky protoplanets during their magma ocean epoch makes them potentially amenable to atmospheric characterization at distances from the Solar System far greater than thermally equilib…
View article: Large Interferometer For Exoplanets (LIFE). XIV. Finding terrestrial protoplanets in the galactic neighborhood
Large Interferometer For Exoplanets (LIFE). XIV. Finding terrestrial protoplanets in the galactic neighborhood Open
The increased brightness temperature of young rocky protoplanets during their magma ocean epoch makes them potentially amenable to atmospheric characterization to distances from the solar system far greater than thermally equilibrated terr…
View article: In-flight pixel degradation of the Sentinel 5 Precursor TROPOMI-SWIR HgCdTe detector
In-flight pixel degradation of the Sentinel 5 Precursor TROPOMI-SWIR HgCdTe detector Open
The TROPOMI-SWIR HgCdTe detector on the Sentinel-5 Precursor mission has been performing in-orbit measurements of molecular absorption in Earth's atmosphere since its launch in October 2017. In its polar orbit the detector is continuously …
View article: In-flight pixel degradation of the Sentinel 5 Precursor TROPOMI-SWIR HgCdTe detector
In-flight pixel degradation of the Sentinel 5 Precursor TROPOMI-SWIR HgCdTe detector Open
The TROPOMI-SWIR HgCdTe detector on the Sentinel-5 Precursor mission has been performing in-orbit measurements of molecular absorption in Earth's atmosphere since its launch in October 2017. In its polar orbit the detector is continuously …
View article: Reply on RC1
Reply on RC1 Open
Abstract. The SWIR module of the TROPOMI instrument on board ESA's Sentinel-5p mission has been very stable during its five years in orbit. Calibration was performed on-ground, complemented by measurements during inflight …
View article: Reply on RC2
Reply on RC2 Open
Abstract. The SWIR module of the TROPOMI instrument on board ESA's Sentinel-5p mission has been very stable during its five years in orbit. Calibration was performed on-ground, complemented by measurements during inflight …
View article: Comment on egusphere-2023-89
Comment on egusphere-2023-89 Open
Abstract. The SWIR module of the TROPOMI instrument on board ESA's Sentinel-5p mission has been very stable during its five years in orbit. Calibration was performed on-ground, complemented by measurements during inflight …
View article: Using satellites to uncover large methane emissions from landfills
Using satellites to uncover large methane emissions from landfills Open
As atmospheric methane concentrations increase at record pace, it is critical to identify individual emission sources with high potential for mitigation. Here, we leverage the synergy between satellite instruments with different spatiotemp…
View article: Ground calibration of the Ariel space telescope: optical ground support equipment design and description
Ground calibration of the Ariel space telescope: optical ground support equipment design and description Open
This paper describes the Optical Ground Support Equipment (OGSE) that is being developed for the payload level testing of the Ariel Space Telescope. Ariel has been adopted as ESA’s “M4” mission in its Cosmic Visions Programme and will laun…
View article: Alignment and integration of the first PLATO camera
Alignment and integration of the first PLATO camera Open
PLATO is an exoplanet hunting mission of the European Space Agency. It is a medium-class mission, with a launch foreseen in 2026. Its prime objective is to uncover Earth-sized planets residing in their habitable zone. The payload consists …
View article: Using satellites to uncover large methane emissions from landfills
Using satellites to uncover large methane emissions from landfills Open
As atmospheric methane concentrations increase at record pace, it is critical to identify individual emission sources with high potential for mitigation. Landfills are responsible for large methane emissions that can be readily abated but …
View article: Vast CO2 release from Australian fires in 2019–2020 constrained by satellite
Vast CO2 release from Australian fires in 2019–2020 constrained by satellite Open
View article: Comment on amt-2020-433
Comment on amt-2020-433 Open
Abstract. Since its launch in 2017, Tropospheric Monitoring Instrument (TROPOMI) on S-5P has provided very high quality data using daily global coverage for a number of key atmospheric trace gases. Over its first 1000 d in…
View article: Reply on RC2
Reply on RC2 Open
Abstract. Since its launch in 2017, Tropospheric Monitoring Instrument (TROPOMI) on S-5P has provided very high quality data using daily global coverage for a number of key atmospheric trace gases. Over its first 1000 d in…
View article: Reply on RC1
Reply on RC1 Open
Abstract. Since its launch in 2017, Tropospheric Monitoring Instrument (TROPOMI) on S-5P has provided very high quality data using daily global coverage for a number of key atmospheric trace gases. Over its first 1000âd …
View article: Comment on amt-2020-433
Comment on amt-2020-433 Open
Abstract. Since its launch in 2017, Tropospheric Monitoring Instrument (TROPOMI) on S-5P has provided very high quality data using daily global coverage for a number of key atmospheric trace gases. Over its first 1000âd …
View article: Supplementary material to "Monitoring the TROPOMI-SWIR module instrument stability usingdesert sites"
Supplementary material to "Monitoring the TROPOMI-SWIR module instrument stability usingdesert sites" Open
Continuum radiances for the full sample (Table 1) as shown in Figure 2. Shown are all soundings over a period of more than 1,000 days, starting 28th of April 2018.The median radiance (red) and a linear fit (green) are shown with lines.Data…
View article: DeGaS-MC: Dense Gas Survey in the Magellanic Clouds
DeGaS-MC: Dense Gas Survey in the Magellanic Clouds Open
Context. Understanding the star-forming processes is key to understanding the evolution of galaxies. Investigating star formation requires precise knowledge of the properties of the dense molecular gas complexes where stars form and a quan…
View article: DeGaS-MC: Dense Gas Survey in the Magellanic Clouds I -- An APEX survey of HCO+ and HCN(2-1) toward the LMC and SMC
DeGaS-MC: Dense Gas Survey in the Magellanic Clouds I -- An APEX survey of HCO+ and HCN(2-1) toward the LMC and SMC Open
Investigating star formation requires precise knowledge of the properties of the dense molecular gas. The low metallicity and wide range of star formation activity of the Large and Small Magellanic Clouds make them prime laboratories to st…
View article: In-flight calibration and monitoring of the Tropospheric Monitoring Instrument (TROPOMI) short-wave infrared (SWIR) module
In-flight calibration and monitoring of the Tropospheric Monitoring Instrument (TROPOMI) short-wave infrared (SWIR) module Open
During its first year in operation the short-wave infrared (SWIR) Tropospheric Monitoring Instrument (TROPOMI) was calibrated in-flight and its performance was monitored. In this paper we present the results of the in-flight calibration an…
View article: In-flight calibration and monitoring of the TROPOMI-SWIR module
In-flight calibration and monitoring of the TROPOMI-SWIR module Open
During its first year in operation the SWIR module of the TROPOMI instrument was calibrated in-flight and its performance was monitored. In this paper we present the results of the in-flight calibration and the ongoing instrument monitorin…
View article: Characterization and correction of stray light in TROPOMI-SWIR
Characterization and correction of stray light in TROPOMI-SWIR Open
The shortwave infrared (SWIR) spectrometer module of the Tropospheric Monitoring Instrument (TROPOMI), on board the ESA Copernicus Sentinel-5 Precursor satellite, is used to measure atmospheric CO and methane columns. For this purpose, cal…
View article: Determination of the TROPOMI-SWIR instrument spectral response function
Determination of the TROPOMI-SWIR instrument spectral response function Open
The Tropospheric Monitoring Instrument (TROPOMI) is the single instrument on board the ESA Copernicus Sentinel-5 Precursor satellite. TROPOMI is a nadir-viewing imaging spectrometer with bands in the ultraviolet and visible, the near infra…
View article: Characterization and correction of stray light in TROPOMI-SWIR
Characterization and correction of stray light in TROPOMI-SWIR Open
The short-wave infrared (SWIR) spectrometer module of the Tropospheric Monitoring Instrument (TROPOMI), on board the ESA Copernicus Sentinel-5 Precursor satellite, is used to measure atmospheric CO and methane columns. For this, calibrated…
View article: New method to determine the instrument spectral response function, applied to TROPOMI-SWIR
New method to determine the instrument spectral response function, applied to TROPOMI-SWIR Open
The Tropospheric Monitoring Instrument (TROPOMI) is the single instrument on board of the ESA Copernicus Sentinel-5 Precursor satellite. TROPOMI is a nadir-viewing imaging spectrometer with bands in the ultraviolet and visible, the near in…
View article: The hot core towards the intermediate-mass protostar NGC 7129 FIRS 2. Chemical similarities with Orion KL
The hot core towards the intermediate-mass protostar NGC 7129 FIRS 2. Chemical similarities with Orion KL Open
[Context] This paper is dedicated to the study of the chemistry of the intermediate-mass (IM) hot core NGC 7129 FIRS 2, probably the most compact warm core found in the 2-8 M⊙ stellar mass range.
View article: Phase correction for ALMA. Investigating water vapour radiometer scaling: The long-baseline science verification data case study
Phase correction for ALMA. Investigating water vapour radiometer scaling: The long-baseline science verification data case study Open
\n The Atacama Large millimetre/submillimetre Array (ALMA) makes use of water vapour radiometers (WVR), which monitor the atmospheric water vapour line at 183 GHz along the line of sight above each antenna to correct for phase delays intro…
View article: Origin of warm and hot gas emission from low-mass protostars: <i>Herschel</i>-HIFI observations of CO <i>J </i>= 16–15
Origin of warm and hot gas emission from low-mass protostars: <i>Herschel</i>-HIFI observations of CO <i>J </i>= 16–15 Open
Context. Through spectrally unresolved observations of high-J CO transitions, Herschel Photodetector Array Camera and Spectrometer (PACS) has revealed large reservoirs of warm (300 K) and hot (700 K) molecular gas around low-mass protostar…