Planetary Science at Oxford Physics 2019
Lead Research Organisation:
University of Oxford
Department Name: Oxford Physics
Abstract
This proposal in planetary physics ranges from studying the atmospheres of the giant planets through to studying the reflectance and thermal properties of airless bodies such as asteroids, which are the primary ways in which these bodies can be studied. The programme outlines a coordinated effort to: 1) measure and understand the fluid circulations, cloud condensation and photochemistry in giant planet atmospheres, both within the Solar System and beyond; and 2) measure and interpret the spectra of airless planetary bodies to better understand their origins, composition and regolith structure. We have four complementary main projects.
Project 1: Recent results from the Juno mission have indicated that the complex, zonally banded atmospheric circulation of Jupiter (and probably Saturn) is neither very deep compared to the planetary radius, nor confined solely to a shallow 'weather layer'. This leaves unanswered a host of key questions concerning the dynamical origin of their meteorology and the resulting transport of heat and material tracers within these iconic and prototypical planetary bodies. In this project, we will test and evaluate possible dynamical mechanisms for energizing the principal features of the atmospheric circulations of Jupiter and Saturn, using a combination of innovative analyses of the observed wind and thermal structure from Cassini, Voyager, Juno and other spacecraft, and a state- of-the-art global numerical circulation model of the deep weather layers of Jupiter and Saturn.
Project 2: How do clouds form in the atmospheres of the Giant Planets? What are they made of and how are they initiated? In this project we will link near-infrared (near-IR) reflection measurements, thermal-IR emission observations and fundamental modelling to explore cloud formation in hydrogen-rich Solar System Giant Planets. This will ultimately benefit the understanding of clouds in both Solar System planets and exoplanets.
Project 3: Primitive asteroids (usually assumed to be C- and B-type asteroids) hold important clues to the formation and evolution of the Solar System. In this project, enabled by our roles as the UK's only Co-Investigator and Participating Scientist, we will use data from NASA's OSIRIS-REx mission to study primitive asteroid Bennu in preparation for sampling of its surface in 2020. As part of the mission's science team, and using our bespoke laboratory and numerical modelling capabilities, our work will place the returned sample into geologic context and also help determine Bennu's place in the wider context of the Solar System's asteroid populations.
Project 4: Remote sensing measurements in the thermal infrared (TIR) can be used to determine the composition and physical properties of an airless body through spectroscopy and temperature mapping. Surface temperature datasets are being acquired by missions including NASA's Lunar Reconnaissance Orbiter (LRO) and OSIRIS-REx, and to interpret them correctly requires new laboratory measurements. This project addresses how thermal emission varies with observation angle, surface roughness and porosity by using and upgrading a unique experimental facility, the Oxford Space Environment Goniometer, to make targeted laboratory measurements to maximise the return from these new and future datasets.
Project 1: Recent results from the Juno mission have indicated that the complex, zonally banded atmospheric circulation of Jupiter (and probably Saturn) is neither very deep compared to the planetary radius, nor confined solely to a shallow 'weather layer'. This leaves unanswered a host of key questions concerning the dynamical origin of their meteorology and the resulting transport of heat and material tracers within these iconic and prototypical planetary bodies. In this project, we will test and evaluate possible dynamical mechanisms for energizing the principal features of the atmospheric circulations of Jupiter and Saturn, using a combination of innovative analyses of the observed wind and thermal structure from Cassini, Voyager, Juno and other spacecraft, and a state- of-the-art global numerical circulation model of the deep weather layers of Jupiter and Saturn.
Project 2: How do clouds form in the atmospheres of the Giant Planets? What are they made of and how are they initiated? In this project we will link near-infrared (near-IR) reflection measurements, thermal-IR emission observations and fundamental modelling to explore cloud formation in hydrogen-rich Solar System Giant Planets. This will ultimately benefit the understanding of clouds in both Solar System planets and exoplanets.
Project 3: Primitive asteroids (usually assumed to be C- and B-type asteroids) hold important clues to the formation and evolution of the Solar System. In this project, enabled by our roles as the UK's only Co-Investigator and Participating Scientist, we will use data from NASA's OSIRIS-REx mission to study primitive asteroid Bennu in preparation for sampling of its surface in 2020. As part of the mission's science team, and using our bespoke laboratory and numerical modelling capabilities, our work will place the returned sample into geologic context and also help determine Bennu's place in the wider context of the Solar System's asteroid populations.
Project 4: Remote sensing measurements in the thermal infrared (TIR) can be used to determine the composition and physical properties of an airless body through spectroscopy and temperature mapping. Surface temperature datasets are being acquired by missions including NASA's Lunar Reconnaissance Orbiter (LRO) and OSIRIS-REx, and to interpret them correctly requires new laboratory measurements. This project addresses how thermal emission varies with observation angle, surface roughness and porosity by using and upgrading a unique experimental facility, the Oxford Space Environment Goniometer, to make targeted laboratory measurements to maximise the return from these new and future datasets.
Planned Impact
Our work is at the cutting edge of modern planetary science and will bring benefits to the UK through public engagement, scientific advancement and industrial collaboration as outlined below.
1. Public Engagement and Outreach: Our group has a very strong track record in public outreach and engagement including participating in events such as "Stargazing Oxford", "Pint of Science" and the Royal Society's Partnership scheme and Summer Exhibition. Typically, the largest public interest in space exploration occurs at crucial moments in a mission's lifetime, e.g. the extended science mission for ESA/NASA's Juno mission, launch of ESA's Jupiter Icy Moons Explorer (JUICE) mission in 2022, rendezvous and sampling for NASA/OSIRIS-REx mission (2019-2022) at asteroid Bennu, and the James Webb Space Telescope (2019 - ). We will work with local organisations to arrange outreach events to mark these key stages in the missions we are involved with. We will continue to contribute to the department's efforts in engaging diverse audiences through targeted programmes and community events and are working to reach schools in Oxford with the lowest progression rates to university. This work aligns with STFC's mission of "Improving our reach with diverse audiences".
2. Analysis Techniques: The techniques we are developing for better exploiting Solar System planet observations will have potential impacts in other areas also. We are a member of an academic partnership with the UK Met Office, which will allow advances we make in atmospheric circulation modelling to be made available to Met Office researchers enabling them to be applied in weather forecasting and climate change prediction. The advanced retrieval techniques we are developing with our radiative transfer and retrieval model, NEMESIS, have the potential to change quite radically the way we think of our place in the Universe since they can be applied not only to Solar System planets, but also to the emerging field of exoplanetary science.
3. Novel Spacecraft Instrumentation: Our space instrument development activity involves collaboration with several UK industrial partners, where we are using technologies we have developed for planetary science instrumentation to enable a new class of radiometers for small Earth observation spacecraft. The surfaces theme includes the development of a compact infrared spectrometer and we are currently in early discussions with Oxford's technology transfer office (Oxford University Innovations Ltd) regarding possible commercial uses for this instrument for future Earth observation and ground-based applications.
4. Laboratory Surface Characterisation: The proposed upgrade to our space environment spectrogoniometer will enable a much wider user group from both academia and industry to gain benefit from using this facility. Example applications include carrying out specialist spectroscopic characterisation of high emissivity coatings or spacecraft components at multiple emission and reflection angles.
5. Building Connections: The planetary group coordinates the Oxford Space Research Network that brings together groups within the University with space instrumentation and technology interests. Our Network is an important route for connecting and disseminating our work to the national and international space sector. Preparation for future missions (especially in ESA's Cosmic Vision programme) helps to inform and enable involvement by UK companies.
6. Citizen Science: For our work on giant planet atmospheres the increasing ability of amateur observers to provide background monitoring of events is a hugely exciting new area of planetary science. Amateur astronomers were responsible for the detection of several planetary storms in the last few years, which led to professional programmes and resulting publications. Such involvements also give rise to increased engagement by amateur observers and the wider public/media
1. Public Engagement and Outreach: Our group has a very strong track record in public outreach and engagement including participating in events such as "Stargazing Oxford", "Pint of Science" and the Royal Society's Partnership scheme and Summer Exhibition. Typically, the largest public interest in space exploration occurs at crucial moments in a mission's lifetime, e.g. the extended science mission for ESA/NASA's Juno mission, launch of ESA's Jupiter Icy Moons Explorer (JUICE) mission in 2022, rendezvous and sampling for NASA/OSIRIS-REx mission (2019-2022) at asteroid Bennu, and the James Webb Space Telescope (2019 - ). We will work with local organisations to arrange outreach events to mark these key stages in the missions we are involved with. We will continue to contribute to the department's efforts in engaging diverse audiences through targeted programmes and community events and are working to reach schools in Oxford with the lowest progression rates to university. This work aligns with STFC's mission of "Improving our reach with diverse audiences".
2. Analysis Techniques: The techniques we are developing for better exploiting Solar System planet observations will have potential impacts in other areas also. We are a member of an academic partnership with the UK Met Office, which will allow advances we make in atmospheric circulation modelling to be made available to Met Office researchers enabling them to be applied in weather forecasting and climate change prediction. The advanced retrieval techniques we are developing with our radiative transfer and retrieval model, NEMESIS, have the potential to change quite radically the way we think of our place in the Universe since they can be applied not only to Solar System planets, but also to the emerging field of exoplanetary science.
3. Novel Spacecraft Instrumentation: Our space instrument development activity involves collaboration with several UK industrial partners, where we are using technologies we have developed for planetary science instrumentation to enable a new class of radiometers for small Earth observation spacecraft. The surfaces theme includes the development of a compact infrared spectrometer and we are currently in early discussions with Oxford's technology transfer office (Oxford University Innovations Ltd) regarding possible commercial uses for this instrument for future Earth observation and ground-based applications.
4. Laboratory Surface Characterisation: The proposed upgrade to our space environment spectrogoniometer will enable a much wider user group from both academia and industry to gain benefit from using this facility. Example applications include carrying out specialist spectroscopic characterisation of high emissivity coatings or spacecraft components at multiple emission and reflection angles.
5. Building Connections: The planetary group coordinates the Oxford Space Research Network that brings together groups within the University with space instrumentation and technology interests. Our Network is an important route for connecting and disseminating our work to the national and international space sector. Preparation for future missions (especially in ESA's Cosmic Vision programme) helps to inform and enable involvement by UK companies.
6. Citizen Science: For our work on giant planet atmospheres the increasing ability of amateur observers to provide background monitoring of events is a hugely exciting new area of planetary science. Amateur astronomers were responsible for the detection of several planetary storms in the last few years, which led to professional programmes and resulting publications. Such involvements also give rise to increased engagement by amateur observers and the wider public/media
Publications



Irwin P
(2019)
Probable detection of hydrogen sulphide (H2S) in Neptune's atmosphere
in Icarus

Lombardo N
(2019)
Ethane in Titan's Stratosphere from Cassini CIRS Far- and Mid-infrared Spectra
in The Astronomical Journal


Thelen Alexander E.
(2019)
Abundance measurements of Titan's stratospheric HCN, HC
3N, C
3H
4, and CH
3CN from ALMA observations
in Icarus

Alday J
(2019)
Oxygen isotopic ratios in Martian water vapour observed by ACS MIR on board the ExoMars Trace Gas Orbiter
in Astronomy & Astrophysics

Thelen Alexander E.
(2019)
Abundance measurements of Titan's stratospheric HCN, HC
3N, C
3H
4, and CH
3CN from ALMA observations
in Icarus

Antuñano A
(2019)
Potential Vorticity of Saturn's Polar Regions: Seasonality and Instabilities
in Journal of Geophysical Research: Planets

Sanz-Requena J
(2019)
Hazes and clouds in a singular triple vortex in Saturn's atmosphere from HST/WFC3 multispectral imaging
in Icarus

Irwin Patrick G. J.
(2019)
Latitudinal variation in the abundance of methane (CH
4) above the clouds in Neptune's atmosphere from VLT/MUSE Narrow Field Mode Observations
in Icarus

Toledo D
(2019)
Constraints on Uranus's haze structure, formation and transport
in Icarus

Sinclair J
(2019)
A brightening of Jupiter's auroral 7.8-µm CH4 emission during a solar-wind compression
in Nature Astronomy



Irwin Patrick G. J.
(2019)
Probable detection of hydrogen sulphide (H
2S) in Neptune's atmosphere
in Icarus

Irwin P
(2019)
Analysis of gaseous ammonia (NH3) absorption in the visible spectrum of Jupiter - Update
in Icarus

Giles R
(2019)
Wave Activity in Jupiter's North Equatorial Belt From Near-Infrared Reflectivity Observations
in Geophysical Research Letters

Thelen A
(2019)
Measurement of CH 3 D on Titan at Submillimeter Wavelengths
in The Astronomical Journal

Lombardo N
(2019)
Detection of Propadiene on Titan
in The Astrophysical Journal

Irwin Patrick G. J.
(2019)
Probable detection of hydrogen sulphide (H
2S) in Neptune's atmosphere
in Icarus

Ruan T
(2019)
Investigating the semiannual oscillation on Mars using data assimilation
in Icarus

Teanby NA
(2019)
Seasonal evolution of Titan's stratosphere during the Cassini mission.
in Geophysical research letters

Irwin Patrick G. J.
(2019)
Analysis of gaseous ammonia (NH
3) absorption in the visible spectrum of Jupiter - Update
in Icarus

Sylvestre M
(2020)
Seasonal evolution of temperatures in Titan's lower stratosphere
in Icarus

Irwin P
(2020)
2.5D retrieval of atmospheric properties from exoplanet phase curves: application to WASP-43b observations
in Monthly Notices of the Royal Astronomical Society

Fedorova A
(2020)
Stormy water on Mars: The distribution and saturation of atmospheric water during the dusty season
in Science

Roman M
(2020)
Uranus in Northern Midspring: Persistent Atmospheric Temperatures and Circulations Inferred from Thermal Imaging
in The Astronomical Journal

Sharkey J
(2020)
Mapping the zonal structure of Titan's northern polar vortex
in Icarus

Braude Ashwin S.
(2020)
Colour and tropospheric cloud structure of Jupiter from MUSE/VLT: Retrieving a universal chromophore
in Icarus