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WASp-121b at different phases as would be seen by an observer, modelled with the 3D SPARC/MITgcm.

The hot Jupiter WASP-121b at different phases as would be seen by an observer, modelled with the 3D SPARC/MITgcm.

Credit: Vivien Parmentier

Vivien Parmentier

Visitor

Research theme

  • Astronomy and astrophysics
  • Exoplanets and planetary physics

Sub department

  • Atmospheric, Oceanic and Planetary Physics

Research groups

  • Exoplanet atmospheres
  • Exoplanets and Stellar Physics
vivien.parmentier@physics.ox.ac.uk
Telephone: 01865282458
Atmospheric Physics Clarendon Laboratory, room 116
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  • Publications

JWST/NIRISS and HST: exploring the improved ability to characterise exoplanet atmospheres in the JWST era

Monthly Notices of the Royal Astronomical Society Oxford University Press 535:1 (2024) 27-46

Authors:

Chloe Fisher, Jake Taylor, Vivien Parmentier, Daniel Kitzmann, Jayne Birkby, Michael Radica, Joanna Barstow, Jingxuan Yang, Giuseppe Morello

Abstract:

The Hubble Space Telescope has been a pioneering instrument for studying the atmospheres of exoplanets, specifically its WFC3 and STIS instruments. With the launch of JWST, we are able to observe larger spectral ranges at higher precision. NIRISS/SOSS covers the range 0.6–2.8 microns, and thus, it can serve as a direct comparison to WFC3 (0.8–1.7 microns). We perform atmospheric retrievals of WFC3 and NIRISS transmission spectra of WASP-39 b in order to compare their constraining power. We find that NIRISS is able to retrieve precise H2O abundances that do not suffer a degeneracy with the continuum level due to the coverage of multiple spectral features. We also combine these data sets with spectra from STIS and find that challenges associated with fitting the steep optical slope can bias the retrieval results. In an effort to diagnose the differences between the WFC3 and NIRISS retrievals, we perform the analysis again on the NIRISS data cut to the same wavelength range as WFC3. We find that the water abundance is in strong disagreement with both the WFC3 and full NIRISS retrievals, highlighting the importance of wide wavelength coverage. Finally, we carry out mock retrievals on the different instruments, which shows further evidence of the challenges in constraining water abundance from the WFC3 data alone. Our study demonstrates the vast information gain of JWST’s NIRISS instrument over WFC3, highlighting the insights to be obtained from our new era of space-based instruments.
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Evidence for morning-to-evening limb asymmetry on the cool low-density exoplanet WASP-107 b

Nature Astronomy Springer Science and Business Media LLC 8:12 (2024) 1562-1574

Authors:

Matthew M Murphy, Thomas G Beatty, Everett Schlawin, Taylor J Bell, Michael R Line, Thomas P Greene, Vivien Parmentier, Emily Rauscher, Luis Welbanks, Jonathan J Fortney, Marcia Rieke
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Multiple Clues for Dayside Aerosols and Temperature Gradients in WASP-69 b from a Panchromatic JWST Emission Spectrum

The Astronomical Journal American Astronomical Society 168:3 (2024) 104

Authors:

Everett Schlawin, Sagnick Mukherjee, Kazumasa Ohno, Taylor J Bell, Thomas G Beatty, Thomas P Greene, Michael Line, Ryan C Challener, Vivien Parmentier, Jonathan J Fortney, Emily Rauscher, Lindsey Wiser, Luis Welbanks, Matthew Murphy, Isaac Edelman, Natasha Batalha, Sarah E Moran, Nishil Mehta, Marcia Rieke
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Inhomogeneous terminators on the exoplanet WASP-39 b

Nature Springer Nature 632:8027 (2024) 1017-1020

Authors:

Néstor Espinoza, Maria E Steinrueck, James Kirk, Ryan J MacDonald, Arjun B Savel, Kenneth Arnold, Eliza M-R Kempton, Matthew M Murphy, Ludmila Carone, Maria Zamyatina, David A Lewis, Dominic Samra, Sven Kiefer, Emily Rauscher, Duncan Christie, Nathan Mayne, Christiane Helling, Zafar Rustamkulov, Vivien Parmentier, Erin M May, Aarynn L Carter, Xi Zhang, Mercedes López-Morales, Natalie Allen, Jasmina Blecic, Leen Decin, Luigi Mancini, Karan Molaverdikhani, Benjamin V Rackham, Enric Palle, Shang-Min Tsai, Eva-Maria Ahrer, Jacob L Bean, Ian JM Crossfield, David Haegele, Eric Hébrard, Laura Kreidberg, Diana Powell, Aaron D Schneider, Luis Welbanks, Peter Wheatley, Rafael Brahm, Nicolas Crouzet
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The Exoplanet Climate Infrared Telescope (EXCITE): gondola pointing and stabilization qualification

Proceedings of SPIE--the International Society for Optical Engineering SPIE, the international society for optics and photonics 13094 (2024) 130944y-130944y-9

Authors:

Javier L Romualdez, Lee Bernard, Andrea Bocchieri, Nathaniel Butler, Quentin Changeat, Azzurra D'Alessandro, Billy Edwards, Johnathan Gamaunt, Qian Gong, John Hartley, Kyle R Helson, Logan Jensen, Daniel P Kelly, Kanchita Klangboonkrong, Annalies Kleyheeg, Ed Leong, Nikole Lewis, Steven Li, Michael Line, Stephen Maher, Ryan McClelland, Laddawan R Miko, Lorenzo V Mugnai, Peter C Nagler, C Barth Netterfield, Vivien Parmentier, Enzo Pascale, Jennifer Patience, Tim Rehm, Subhajit Sarkar, Paul Scowen, Gregory Tucker, Augustyn Waczynski, Ingo Waldmann
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