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Dr. Koskinen’s research focuses on the structure and evolution of planet and satellite atmospheres in the solar system and extrasolar planetary systems. He is particularly interested in the physics and chemistry of the middle and upper atmosphere that he studies through both the analysis of observations and theoretical modeling. His research covers a wide range of different objects and techniques in the spirit of comparative planetology, which is critical to our understanding of the evolution of planetary atmospheres and environments in general. Dr. Koskinen served as a participating scientist on the Cassini mission and he is still actively involved in research on the atmospheres of Saturn and Titan. In addition, he develops and maintains models of exoplanet atmospheres that are required to interpret current and planned observations as well as to simulate mass loss and address questions on long-term evolution.Show Less
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Courses
- SPCCScience and Politics of Climate Change
- PHAPhysics of High Atmospheres
- TUHODThe Universe and Humanity: Origin and Destiny
Grants
- A comprehensive model of atmospheric escape for transiting planets on the edge of the Hot Neptune desert
Principal Investigator (PI)
2023
$151.2K
Active - The Changing Seasons of Saturn's Upper Atmosphere Viewed in the Ultraviolet
Principal Investigator (PI)
2022
$158.5K
Active - Alien Earths: Which Nearby Planetary Systems Are Likely to Host Habitable Planets and Life?
Co-Investigator (COI)
2021
$2.8M
Active - CUTE Science Mission and Operations: A CubeSat Studying the Most Extreme Exoplanets
Principal Investigator (PI)
2021
$30.0K
Active - Saturn's Upper Atmosphere Revealed by New Cassini/UVIS Occultations
Principal Investigator (PI)
2019
$443.5K
Active - A Comprehensive Investigation of Titan's Middle and Upper Atmosphere
Principal Investigator (PI)
2019
$350.6K
Active - The Middle Atmospheres of Exoplanets
Co-Investigator (COI)
2018
$407.6K
Active - Atmospheric Structure and Escape on Pluto
Principal Investigator (PI)
2018
$244.9K
Active - Cloudy Solutions to the Anomalous Emission of HD 80606b
Principal Investigator (PI)
2020
$18.4K
- Colorado Ultraviolet Transit Experiment: Mass-Loss and Magnetic Fields in Exoplanetary Systems
Principal Investigator (PI)
2019
$45.0K
News
- What Makes Saturn's Upper Atmosphere So Hot
2020
Publications (158)
Recent
- Photochemical hazes dramatically alter temperature structure and atmospheric circulation in 3D simulations of hot Jupiters
2022
- Detection Feasibility of H$_2$ in Ultra-hot Jupiter Atmospheres
2022
- Titan's atmospheric structure from Cassini/UVIS airglow observations
2022
- The rapidly escaping atmosphere of WASP-121b
2022
- Energy deposition in Saturn's equatorial upper atmosphere
2022
- Mass Loss by Atmospheric Escape from Extremely Close-in Planets
2022
- Radiative Feedback of Photochemical Hazes in 3D Simulations of Hot Jupiters
2022
- The Population of Earths and super-Earths into the Habitable Zone
2022
- The Demographics of Kepler's Earths and Super-Earths into the Habitable Zone
2022
- Evidence for Gravity Waves in the Thermosphere of Saturn and Implications for Global Circulation
2022
- Understanding the Demographics of Young Transiting Planets in TESS Photometry using Pterodactyls
2022
- Extreme-ultraviolet Stellar Characterization for Atmospheric Physics and Evolution mission: motivation and overview
2022
- Compositional Measurements of Saturn's Upper Atmosphere and Rings From Cassini INMS: An Extended Analysis of Measurements From Cassini's Grand Finale Orbits
2022
- Investigating Photochemical Products in Saturn's Mesosphere
2022
- A hydrodynamic study of the escape of metal species and excited hydrogen in the atmosphere of the hot Jupiter WASP-121b
2022
- pterodactyls: A Tool to Uniformly Search and Vet for Young Transiting Planets in TESS Primary Mission Photometry
2022
- Science goals and new mission concepts for future exploration of Titan's atmosphere, geology and habitability: titan POlar scout/orbitEr and in situ lake lander and DrONe explorer (POSEIDON)
2022
- Gas Giant and Ice Giant Atmospheres: Focused Questions for 2023-2032
2021
- An empirical model of the Saturn thermosphere
2021
- The ESCAPE mission overview: exploring the stellar drivers of exoplanet habitability
2021
- Simulating radiative feedback of photochemical hazes in general circulation models of hot Jupiters
2021
- The Saturn Ring Skimmer Mission Concept: The next step to explore Saturn's rings, atmosphere, interior and inner magnetosphere
2021
- Seasonal variation of hydrocarbon abundances on Saturn: Comparisons of coupled ion-neutral photochemical models with Cassini UVIS, CIRS, and INMS data
2021
- Titan occultations of Orion's belt observed with Cassini/UVIS
2021
- Demographics of Small Kepler Planets and their Dependence on Stellar Mass
2021
- Titan in Transit: Ultraviolet Stellar Occultation Observations Reveal a Complex Atmospheric Structure
2021
- Non-local thermodynamic equilibrium effects determine the upper atmospheric temperature structure of the ultra-hot Jupiter KELT-9b
2021
- The Normal-incidence Extreme Ultraviolet Photometer (NExtUP)
2021
- NExtUP: the Normal-incidence Extreme Ultraviolet Photometer
2021
- High-resolution detection of neutral oxygen and non-LTE effects in the atmosphere of KELT-9b
2021
- A Snapshot of Photochemical Products in Saturn's Mesosphere
2021
- Simulating haze radiative feedback in general circulation models of hot Jupiters
2021
- Three-dimensional Simulations of Photochemical Hazes in the Atmosphere of Hot Jupiter HD 189733b
2020
- Cassini UVIS Observations of He 584A Airglow at Saturn
2020
- The distribution of hydrocarbons in Saturn's mesosphere from Cassini's Grand Finale
2020
- Titan in Transit: Ultraviolet Occultation Observations Reveal a Complex Atmospheric Structure
2020
- Saturn in Lyman alpha: A comparison of Cassini and Voyager observations
2020
- The Saturn Ring Skimmer Mission Concept: The next step to explore Saturn's rings, atmosphere, interior, and inner magnetosphere
2020
- Saturn Ring Skimmer Mission Concept
2020
- The High-energy Radiation Environment around a 10 Gyr M Dwarf: Habitable at Last?
2020
- Corrigendum to ``Saturn in Lyman alpha: A comparison of Cassini and Voyager observations'' [Icarus 339 (2020) 113594]
2020
- Electrodynamics in Saturn's thermosphere at low and middle latitudes
2020
- Exoplanets and the Sun
2020
- A hydrodynamic study of radiative cooling and escape of metal species in hot Jupiter atmospheres
2020
- Detection of Ionized Calcium in the Atmosphere of the Ultra-hot Jupiter KELT-9b
2020
- A data-driven approach to constraining the atmospheric temperature structure of the ultra-hot Jupiter KELT-9b
2020
- Non-local thermodynamic equilibrium transmission spectrum modelling of HD 209458b
2020
- A pole-to-pole pressure-temperature map of Saturn's thermosphere from Cassini Grand Finale data
2020
- 3D simulations of photochemical hazes in the atmosphere of hot Jupiter HD 189733b
2020
- Star-planet interaction through spectral lines
2020
- Near-ultraviolet Transmission Spectroscopy of HD 209458b: Evidence of Ionized Iron Beyond the Planetary Roche Lobe
2020
- Ultraviolet-Based Science in the Solar System: Advances and Next Steps
2020
- Saturn's Seasonal Atmosphere at Northern Summer Solstice
2020
- Compositional Measurements of Saturn's Upper Atmosphere and Rings from Cassini INMS
2020
- Thermospheric Circulation and Pole-to-Pole Temperatures from Cassini Grand Finale Occultations
2019
- Photochemical hazes in sub-Neptunian atmospheres with focus on GJ 1214 b
2019
- Constraints on the Na abundance of XO-2 b using ground-based mutli-object spectroscopy
2019
- Atmospheric waves and their effect on the thermal structure of Saturn's thermosphere
2019
- Latitudinal variations in Titan's atmosphere: UVIS observations of three simultaneous stellar occultations
2019
- EUV influences on exoplanet atmospheric stability and evolution
2019
- Revisiting the NUV Transmission Spectrum of HD 209458b: Signs of Ionized Iron Beyond the Roche Lobe
2019
- Three-dimensonal Mixing of Photochemical Hazes in the Atmospheres of Hot Jupiters
2019
- EUV observations of cool dwarf stars
2019
- The CUTE Small Satellite Mission
2019
- Investigating the Interactions between Saturn's Upper Atmosphere and Rings from Cassini INMS Measurements
2019
- The extreme-ultraviolet stellar characterization for atmospheric physics and evolution (ESCAPE) mission concept
2019
- Monitoring Saturn's Upper Atmosphere Density Variations and He Mixing Ratio Using Cassini Helium 584 \r{A} Airglow Observations
2019
- Colorado Ultraviolet Transit Experiment data simulator
2019
- Results from an Improved Model of Electrodynamics in Saturn's Upper Atmosphere
2019
- Cassini UVIS Detection of Saturn s North Polar Hexagon in the Grand Finale Orbits
2019
- VizieR Online Data Catalog: Ground-based spectroscopy of the exoplanet XO-2b (Pearson+, 2019)
2019
- Photochemical Hazes in Sub-Neptunian Atmospheres with a Focus on GJ 1214b
2019
- Signs of Ionized Iron Beyond the Roche Lobe of HD 209458b from NUV Observations
2019
- Saturn's upper atmosphere from the Cassini/UVIS Grand Finale stellar occultations
2018
- Extreme-ultraviolet Radiation from A-stars: Implications for Ultra-hot Jupiters
2018
- MAVEN/IUVS Stellar Occultation Measurements of Mars Atmospheric Structure and Composition
2018
- Suppressed Far-UV stellar activity and low planetary mass loss in the WASP-18 system
2018
- CUTE: A Small NUV Satellite Mission to Study Exoplanet Atmospheres
2018
- Thermal Structure and Composition of Saturn's Upper Atmosphere From Cassini/Ion Neutral Mass Spectrometer Measurements
2018
- The Composition and Thermal Structure of Saturn's Upper Atmosphere from Cassini/INMS Measurements
2018
- Ground-based Spectroscopy of the Exoplanet XO-2b Using a Systematic Wavelength Calibration
2018
- A chemical survey of exoplanets with ARIEL
2018
- Monitoring Saturn's Upper Atmosphere Density Variations and Determination of the Saturnian He Mixing Ratio Using Helium 584 \AA Airglow
2018
- The formation of benzene and complex hydrocarbons in the auroral and non-auroral regions of Saturn
2018
- Energy balance in Saturn's upper atmosphere
2018
- Atmospheric structure and helium abundance on Saturn from Cassini/UVIS and CIRS observations
2018
- The near-UV transmission spectrum of the prototypical hot Jupiter HD209458b
2018
- Extremely Irradiated Hot Jupiters: Non-oxide Inversions, H$^â$ Opacity, and Thermal Dissociation of Molecules
2018
- Colorado Ultraviolet Transit Experiment: a dedicated CubeSat mission to study exoplanetary mass loss and magnetic fields
2018
- The impact of crustal magnetic fields on the thermal structure of the Martian upper atmosphere
2018
- An empirical model of Saturn's thermosphere based on Cassini/UVIS occultations
2018
- Temperature Profiles and Wave Structures Observed with IUVS/MAVEN Stellar Occultations
2017
- Aerosol Properties of the Atmospheres of Extrasolar Giant Planets
2017
- CUTE: The Colorado Ultraviolet Transit Experiment
2017
- Non-LTE Models for the Thermal Structure of Hot Jupiters
2017
- Thermal Structure of Pluto's Lower Atmosphere
2017
- Resistive Heating and Ion Drag in Saturn's Thermosphere
2017
- The Colorado Ultraviolet Transit Experiment (CUTE): a dedicated cubesat mission for the study of exoplanetary mass loss and magnetic fields
2017
- Effect of stellar flares on the upper atmospheres of HD 189733b and HD 209458b
2017
- Constraints on atmospheric structure and helium abundance of Saturn from Cassini/UVIS and CIRS
2017
- Aerosols and clouds in the atmosphere of HD 189733 b
2017
- The effect of ISM absorption on stellar activity measurements and its relevance for exoplanet studies
2017
- Ultraviolet C II and Si III Transit Spectroscopy and Modeling of the Evaporating Atmosphere of GJ436b
2017
- Stratospheric benzene and hydrocarbon aerosols observed in Saturn's upper atmosphere
2017
- Atmospheric Abundances Retrieved from IUVS/MAVEN Stellar Occultations
2017
- The Variability of HCN in Titan's Upper Atmosphere as Implied by the Cassini Ion-Neutral Mass Spectrometer Measurements
2016
- New observational constraints on hydrocarbon chemistry in Saturn's upper atmosphere
2016
- The Effect of Diurnal Variations on Ionospheric Radio Occultations
2016
- New benzene absorption cross sections in the VUV, relevance for Titan's upper atmosphere
2016
- The detection of benzene in Saturn s upper atmosphere: C sub 6 /sub H sub 6 /sub ON SATURN
2016
- Martian Temperature Profiles Measured by MAVEN and MRO from 20 to 160 km
2016
- Aerosol properties in Titan's upper atmosphere
2016
- The detection of benzene in Saturn's upper atmosphere
2016
- Resistive Heating in Saturn's Thermosphere
2016
- EUV-driven ionospheres and electron transport on extrasolar giant planets orbiting active stars
2016
- Titan's Upper Atmosphere from Cassini/UVIS Solar Occultations
2015
- Far-UV Spectroscopy of the Planet-hosting Star WASP-13: High-energy Irradiance, Distance, Age, Planetary Mass-loss Rate, and Circumstellar Environment
2015
- Altitude profiles of O2 on Mars from SPICAM stellar occultations
2015
- Radiative equilibrium and escape of Pluto's atmosphere
2015
- Saturn's variable thermosphere from Cassini/UVIS occultations
2015
- Analysis of Cassini UVIS Extreme and Far Ultraviolet Observations of Saturn's Atmosphere
2015
- Modelling the ionosphere of gas-giant exoplanets irradiated by low-mass stars
2015
- Variability in Saturn's upper atmosphere from Cassini/UVIS occultations
2015
- Aerosol properties in Titan's upper atmosphere from UVIS airglow observations
2015
- Probing the Martian Atmosphere with MAVEN/IUVS Stellar Occultations
2015
- Predictions for the escape of CH4 from Pluto
2015
- On the escape of CH4 from Pluto's atmosphere
2015
- Implications of hazes in observations of exoplanet atmospheres
2015
- The EChO science case
2015
- New benzene absorption cross sections in the VUV, relevance for Titan rsquo;s
2015
- XUV-driven mass loss from extrasolar giant planets orbiting active stars
2015
- N2 and CH4 Densities Retrieved from Dayglow and Occultation Observations of Titan's Upper Atmosphere
2014
- Electrodynamics in Giant Planet Atmospheres
2014
- Modelling of Hot Jupiter thermospheres and ionospheres under irradiation from active stars
2014
- Escaping hydrogen from HD209458b
2014
- Thermal escape from extrasolar giant planets
2014
- Escape of Hydrogen from HD209458b
2014
- Electron densities and alkali atoms in exoplanet atmospheres
2014
- The variability of Saturn's thermosphere from Cassini/UVIS occultations
2014
- Na, K, and electrons in exoplanet atmospheres
2014
- O2 abundance on Mars observed by Mars Express / SPICAM
2014
- Electrodynamics on Extrasolar Giant Planets
2014
- Aerosol growth in Titan's ionosphere
2013
- The density and temperature structure near the exobase of Saturn from Cassini UVIS solar occultations
2013
- Solar Occultation by Titan Measured by Cassini/UVIS
2013
- The thermosphere of Saturn from Cassini UVIS occultations
2013
- The escape of heavy atoms from the ionosphere of HD209458b. I. A photochemical-dynamical model of the thermosphere
2013
- Hot-Jupiter ionospheres irradiated by low-mass stars
2013
- The escape of heavy atoms from the ionosphere of HD209458b. II. Interpretation of the observations
2013
- Dynamics of Ionized Giant Planet Atmospheres
2013
- Calculation of the H Lyman alpha emission of the hot Jupiters HD 209458b and HD 189733b
2013
- Aerosol properties in exoplanet atmospheres
2013
- The CH4 structure in Titan s upper atmosphere revisited
2012
- The mesosphere and lower thermosphere of Titan revealed by Cassini/UVIS stellar occultations
2011
- Ionization of extrasolar giant planet atmospheres
2010
- Characterizing the Thermosphere of HD209458b with UV Transit Observations
2010
- A thermospheric circulation model for extrasolar giant planets
2007
- A stability limit for the atmospheres of giant extrasolar planets.
2007