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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

Phase-resolving the Absorption Signatures of Water and Carbon Monoxide in the Atmosphere of the Ultra-hot Jupiter WASP-121b with GEMINI-S/IGRINS

Publications of the Astronomical Society of the Pacific Astronomical Society of the Pacific 136:8 (2024) 084403

Authors:

Joost P Wardenier, Vivien Parmentier, Michael R Line, Megan Weiner Mansfield, Xianyu Tan, Shang-Min Tsai, Jacob L Bean, Jayne L Birkby, Matteo Brogi, Jean-Michel Désert, Siddharth Gandhi, Elspeth KH Lee, Colette I Levens, Lorenzo Pino, Peter CB Smith

Abstract:

Ultra-hot Jupiters (UHJs) are among the best targets for atmospheric characterization at high spectral resolution. Resolving their transmission spectra as a function of orbital phase offers a unique window into the 3D nature of these objects. In this work, we present three transits of the UHJ WASP-121b observed with Gemini-S/IGRINS. For the first time, we measure the phase-dependent absorption signals of CO and H2O in the atmosphere of an exoplanet, and we find that they are different. While the blueshift of CO increases during the transit, the absorption lines of H2O become less blueshifted with phase, and even show a redshift in the second half of the transit. These measurements reveal the distinct spatial distributions of both molecules across the atmospheres of UHJs. Also, we find that the H2O signal is absent in the first quarter of the transit, potentially hinting at cloud formation on the evening terminator of WASP-121b. To further interpret the absorption trails of CO and H2O, as well as the Doppler shifts of Fe previously measured with VLT/ESPRESSO, we compare the data to simulated transits of WASP-121b. To this end, we post-process the outputs of the global circulation models with a 3D Monte-Carlo radiative transfer code. Our analysis shows that the atmosphere of WASP-121b is subject to atmospheric drag, as previously suggested by small hotspot offsets inferred from phase-curve observations. Our study highlights the importance of phase-resolved spectroscopy in unravelling the complex atmospheric structure of UHJs and sets the stage for further investigations into their chemistry and dynamics.
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Lessons from Hubble and Spitzer: 1D Self-consistent Model Grids for 19 Hot Jupiter Emission Spectra

The Astrophysical Journal American Astronomical Society 971:1 (2024) 33

Authors:

Lindsey S Wiser, Michael R Line, Luis Welbanks, Megan Mansfield, Vivien Parmentier, Jacob L Bean, Jonathan J Fortney
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Identifying and fitting eclipse maps of exoplanets with cross-validation

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 532:4 (2024) 4350-4368

Authors:

Mark Hammond, Neil T Lewis, Sasha Boone, Xueqing Chen, João M Mendonça, Vivien Parmentier, Jake Taylor, Taylor Bell, Leonardo dos Santos, Nicolas Crouzet, Laura Kreidberg, Michael Radica, Michael Zhang
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Design and testing of a low-resolution NIR spectrograph for the Exoplanet Climate Infrared Telescope

Proceedings of SPIE--the International Society for Optical Engineering SPIE, the international society for optics and photonics 13096 (2024) 13096a5-13096a5-13

Authors:

Lee Bernard, Johnathan Gamaunt, Logan Jensen, Andrea Bocchieri, Nat Butler, Quentin Changeat, Azzurra D'Alessandro, Billy Edwards, Conor Earley, Qian Gong, John Hartley, Kyle Helson, Daniel P Kelly, Kanchita Klangboonkrong, Annalies Kleyheeg, Nikole Lewis, Steven Li, Michael Line, Stephen F Maher, Ryan McClelland, Laddawan R Miko, Lorenzo V Mugnai, Peter Nagler, C Barth Netterfield, Vivien Parmentier, Enzo Pascale, Jennifer Patience, Tim Rehm, Javier Romualdez, Subhajit Sarkar, Paul Scowen, Greg Tucker, Augustyn Waczynski, Ingo Waldmann
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Integration and testing of a cryogenic receiver for the Exoplanet Climate Infrared Telescope (EXCITE)

Proceedings of SPIE--the International Society for Optical Engineering SPIE, the international society for optics and photonics 13096 (2024) 130963p-130963p-10

Authors:

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