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Dr Juan Alday

Profile summary

  • Research Staff
  • Post Doctoral Research Associate, ExoMars
  • Faculty of Science, Technology, Engineering & Mathematics
  • School of Physical Sciences
  • juan.alday

Web links

Professional biography

Dr Juan Alday is a Postdoctoral Researcher of Planetary Science at The Open University, specialising in the investigation of the composition and variations of the atmosphere of Mars via space missions and ground-based telescopes.

He earned a Master’s degree in Electrophysics at KTH Royal Institute of Technology in Sweden where he investigated the hydrogen corona of the Jupiter’s Galilean Moons using ultraviolet observations from the Hubble Space Telescope, work by which he was awarded the Best Degree Thesis Prize by the KTH Space Center. He later pursued his PhD in Planetary Physics at the University of Oxford in the United Kingdom, where he investigated the isotopic composition of the atmosphere of Mars using observations from the Atmospheric Chemistry Suite onboard the ExoMars Trace Gas Orbiter, work by which he was awarded the Keith Runcorn Thesis Prize in 2021 by the Royal Astronomical Society. Since then, he worked as a postdoctoral researcher at the University of Oxford, The Open University and the University of Tokyo investigating the dust, chemical and seasonal cycles in the atmosphere of Mars, focusing on how the affect its isotopic composition.

Impact and engagement

Awards

Community service

  • Reviewer for Geophysical Research Letters (1).
  • Reviewer for Journal of Geophysical Research: Planets (2).
  • Reviewer for Nature Astronomy (1).
  • Reviewer for Nature Communications (1).
  • Reviewer of scientific proposals for NASA's Solar System Workings Program (1).

Media appereances

 

External collaborations

Mission involvement

Scientific projects

Publications

Upper limits of HO2 in the atmosphere of Mars from the ExoMars Trace Gas Orbiter (2024-08)
Alday, Juan; Trokhimovskiy, Alexander; Belyaev, Denis A.; Fedorova, Anna A.; Holmes, James A.; Patel, Manish R.; Mason, Jonathon P.; Lefèvre, Franck; Olsen, Kevin S; Montmessin, Franck; Korablev, Oleg; Baggio, Lucio and Patrakeev, Andrey
Monthly Notices of the Royal Astronomical Society, 532(4) (pp. 4429-4435)

Relationships Between HCl, H2O, Aerosols, and Temperature in the Martian Atmosphere: 1. Climatological Outlook (2024-08)
Olsen, K. S.; Fedorova, A. A.; Kass, D. M.; Kleinböhl, A.; Trokhimovskiy, A.; Korablev, O. I.; Montmessin, F.; Lefèvre, F.; Baggio, L.; Alday, J.; Belyaev, D. A.; Holmes, J. A.; Mason, J. P.; Streeter, P. M.; Rajendran, K.; Patel, M. R.; Patrakeev, A. and Shakun, A.
Journal of Geophysical Research: Planets, 129, Article e2024JE008350(8)

Relationships Between HCl, H2O, Aerosols, and Temperature in the Martian Atmosphere: 2. Quantitative correlations (2024-08)
Olsen, K. S.; Fedorova, A. A.; Kass, D. M.; Kleinböhl, A.; Trokhimovskiy, A.; Korablev, O. I.; Montmessin, F.; Lefèvre, F.; Baggio, L.; Alday, J.; Belyaev, D. A.; Holmes, J. A.; Mason, J. P.; Streeter, P. M.; Rajendran, K.; Patel, M. R.; Patrakeev, A. and Shakun, A.
Journal of Geophysical Research: Planets, 129, Article e2024JE008351(8)

Constraining the global composition of D/H and 18O/16O in Martian water using SOFIA/EXES (2024-05)
Alday, J; Aoki, S; DeWitt, C; Montmessin, F; Holmes, J A; Patel, M R; Mason, J P; Encrenaz, T; Richter, M J; Irwin, P G J; Daerden, F; Terada, N and Nakagawa, H
Monthly Notices of the Royal Astronomical Society, 530(3) (pp. 2919-2932)

Revised upper limits for abundances of NH3, HCN and HC3N in the Martian atmosphere (2024-01-01)
Trokhimovskiy, A.; Fedorova, A.A.; Lefèvre, F.; Korablev, O.; Olsen, K.S.; Alday, J.; Belyaev, D.; Montmessin, F.; Patrakeev, A. and Kokonkov, N.
Icarus, 407, Article 115789

Climatology and Diurnal Variation of Ozone Column Abundances for 2.5 Mars Years as Measured by the NOMAD‐UVIS Spectrometer (2024)
Mason, J. P.; Patel, M. R.; Holmes, J. A.; Wolff, M. J.; Alday, J.; Streeter, P.; Olsen, K. S.; Brown, M. A. J.; Sellers, G.; Marriner, C.; Willame, Y.; Thomas, I.; Ristic, B.; Daerden, F.; Vandaele, A. C.; Lopez‐Moreno, J.‐J. and Bellucci, G.
Journal of Geophysical Research: Planets, 129, Article e2023JE008270(4)

Mars’ Water Cycle and Escape: A View from Mars Express and Beyond (2024)
Montmessin, F.; Fedorova, A.; Alday, J.; Aoki, S.; Chaffin, M.; Chaufray, J.-Y.; Encrenaz, T.; Fouchet, T.; Knutsen, E. W.; Korablev, O.; Liuzzi, G.; Mayyasi, M. A.; Pankine, A.; Trokhimovskiy, A. and Villanueva, G. L.
Space Science Reviews, 220, Article 77(7)

Ultraviolet and Visible Reflectance Spectra of Phobos and Deimos as Measured by the ExoMars‐TGO/NOMAD‐UVIS Spectrometer (2023-12)
Mason, J. P.; Patel, M. R.; Pajola, M.; Cloutis, E. D.; Alday, J.; Olsen, K. S.; Marriner, C.; Holmes, J. A.; Sellers, G.; Thomas, N.; Almeida, M.; Read, M.; Nakagawa, H.; Thomas, I. R.; Ristic, B.; Willame, Y.; Depiesse, C.; Daerden, F.; Vandaele, A. C.; Lopez‐Moreno, J. J. and Bellucci, G.
Journal of Geophysical Research: Planets, 128, Article e2023JE008002(12)

Photochemical depletion of heavy CO isotopes in the Martian atmosphere (2023-07)
Alday, Juan; Trokhimovskiy, Alexander; Patel, Manish R.; Fedorova, Anna A.; Lefèvre, Franck; Montmessin, Franck; Holmes, James A.; Rajendran, Kylash; Mason, Jon P.; Olsen, Kevin S.; Belyaev, Denis A.; Korablev, Oleg; Baggio, Lucio; Patrakeev, Andrey and Shakun, Alexey
Nature Astronomy, 7(7) (pp. 867-876)

A two‐Martian year survey of the water vapor saturation state on Mars based on ACS NIR/TGO occultations (2023-01)
Fedorova, Anna; Montmessin, Franck; Trokhimovskiy, Alexander; Luginin, Mikhail; Korablev, Oleg; Alday, Juan; Belyaev, Denis; Holmes, James; Lefevre, Franck; Olsen, Kevin; Patrakeev, Andrey and Shakun, Alexey
Journal of Geophysical Research: Planets, 128, Article e2022JE007348(1)

Callisto’s atmosphere: First evidence for H2 and constraints on H2O (2022-11-17)
Carberry Mogan, S. R.; Tucker, O. J.; Johnson, R. E.; Roth, L.; Alday, J.; Vorburger, A.; Wurz, P.; Galli, A.; Smith, H. T.; Marchand, B. and Oza, A. V.
Journal of Geophysical Research: Planets, 127, Article e2022JE007294(11)

Seasonal changes in the vertical structure of ozone in the Martian lower atmosphere and its relationship to water vapour (2022-10-24)
Olsen, K. S.; Fedorova, A. A.; Trokhimovskiy, A.; Montmessin, F.; Lefèvre, F.; Korablev, O.; Baggio, L.; Forget, F.; Millour, E.; Bierjon, A.; Alday, J.; Wilson, C. F.; Irwin, P. G. J.; Belyaev, D. A.; Patrakeev, A. and Shakun, A.
Journal of Geophysical Research: Planets, 127, Article e2022JE007213(10)

Global Variations in Water Vapor and Saturation State Throughout the Mars Year 34 Dusty Season (2022-10)
Holmes, J. A.; Lewis, S. R.; Patel, M. R.; Alday, J.; Aoki, S.; Liuzzi, G.; Villanueva, G. L.; Crismani, M. M. J.; Fedorova, A. A.; Olsen, K. S.; Kass, D. M.; Vandaele, A. C. and Korablev, O.
Journal of Geophysical Research: Planets, 127, Article e2022JE007203(10)

Thermal Structure of the Middle and Upper Atmosphere of Mars From ACS/TGO CO 2 Spectroscopy (2022-10)
Belyaev, D. A.; Fedorova, A. A.; Trokhimovskiy, A.; Alday, J.; Korablev, O. I.; Montmessin, F.; Starichenko, E. D.; Olsen, K. S. and Patrakeev, A. S.
Journal of Geophysical Research: Planets, 127, Article e2022JE007286(10)

The HDO cycle on Mars: Comparison of ACS observations with GCM simulations (2022-08-16)
Rossi, Loïc; Vals, Margaux; Alday, Juan; Montmessin, Franck; Fedorova, Anna; Trokhimovskiy, Alexander; Korablev, Oleg; Lefèvre, Franck; Gonzalez‐Galindo, Francisco; Luginin, Mikhail; Bierjon, Antoine; Forget, François and Millour, Ehouarn
Journal of Geophysical Research: Planets, 127, Article e2022JE007201(8)

Mid-ultraviolet Hubble Observations of Europa and the Global Surface Distribution of SO2 (2022-06)
Becker, Tracy M.; Trumbo, Samantha K.; Molyneux, Philippa M.; Retherford, Kurt D.; Hendrix, Amanda R.; Roth, Lorenz; Raut, Ujjwal; Alday, Juan and McGrath, Melissa A.
The Planetary Science Journal, 3, Article 129(6)

Reappraising the production and transfer of hydrogen atoms from the middle to the upper atmosphere of Mars at times of elevated water vapor (2022-05)
Montmessin, F.; Belyaev, D. A.; Lefèvre, F.; Alday, J.; Vals, M.; Fedorova, A. A.; Korablev, O. I.; Trokhimovskiy, A. V.; Chaffin, M. S. and Schneider, N. M.
Journal of Geophysical Research: Planets, 127, Article e2022JE007217(5)

Climatology of the CO Vertical Distribution on Mars Based on ACS TGO Measurements (2022)
Fedorova, Anna; Trokhimovskiy, Alexander; Lefèvre, Franck; Olsen, Kevin S.; Korablev, Oleg; Montmessin, Franck; Ignatiev, Nikolay; Lomakin, Alexander; Forget, Francois; Belyaev, Denis; Alday, Juan; Luginin, Mikhail; Smith, Michael; Patrakeev, Andrey; Shakun, Alexey and Grigoriev, Alexey
Journal of Geophysical Research: Planets, 127(9)

Global variations in the vertical distribution of water on Mars from a reanalysis of multiple spacecraft observations (2022-07)
Holmes, James; Lewis, Stephen; Patel, Manish; Alday, Juan; Aoki, Shohei; Liuzzi, Giuliano; Villanueva, Geronimo; Crismani, Matteo; Fedorova, Anna; Olsen, Kevin; Kass, David; Vandaele, Ann Carine and Korablev, Oleg
In : COSPAR 2022, 44th Scientific Assembly (16-24 Jul 2022, Athens, Greece)

Total column ozone climatology from MY34 to MY36 from measurements by the NOMAD-UVIS spectrometer (2022-06-14)
Mason, Jonathon; Patel, Manish; Holmes, James; Streeter, Paul; Alday, Juan; Brown, Megan; Sellers, Graham; Marriner, Charlotte; Lewis, Stephen; Wolff, M. J.; Williame, Y.; Depiesse, C.; Ristic, B.; Thomas, I.; Daerden, F.; Vandaele, A. C.; Lopez-Moreno, J.-J. and Bellucci, G.
In : 7th Mars Atmosphere Modelling and Observations workshop (14-17 Jun 2022, Paris, France)

Global 4-D Investigation of Water During the Mars Year 34 Dusty Season from a Multi-Spacecraft Assimilation (2022-06)
Holmes, James; Lewis, Stephen; Patel, Manish; Alday, Juan; Aoki, Shohei; Liuzzi, Giuliano; Villanueva, Geronimo; Crismani, Matteo; Fedorova, Anna; Korablev, Oleg; Olsen, Kevin; Kass, David and Vandaele, Ann Carine
In : 7th Mars Atmosphere Modelling and Observations Conference (14-17 Jun 2022, Paris, France)

Global variations in the vertical distribution of water during Mars Year 34 from multiple spacecraft observations (2021)
Holmes, James; Lewis, Stephen; Patel, Manish; Aoki, Shohei; Liuzzi, Giuliano; Villanueva, Geronimo; Crismani, Matteo; Fedorova, Anna; Alday, Juan; Kass, David; Vandaele, Ann Carine and Korablev, Oleg
In : European Planetary Science Congress 2021 (13-24 Sep 2021, Online)