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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

Two-dimensional Eclipse Mapping of the Hot-Jupiter WASP-43b with JWST MIRI/LRS

Astronomical Journal IOP Publishing 168:1 (2024) 4

Authors:

Mark Hammond, Taylor J Bell, Ryan C Challener, Neil T Lewis, Megan Weiner Mansfield, Isaac Malsky, Emily Rauscher, Jacob L Bean, Ludmila Carone, João M Mendonça, Lucas Teinturier, Xianyu Tan, Nicolas Crouzet, Laura Kreidberg, Giuseppe Morello, Vivien Parmentier, Jasmina Blecic, Jean-Michel Désert, Christiane Helling, Pierre-Olivier Lagage, Karan Molaverdikhani, Matthew C Nixon, Benjamin V Rackham, Jingxuan Yang

Abstract:

We present eclipse maps of the two-dimensional thermal emission from the dayside of the hot-Jupiter WASP-43b, derived from an observation of a phase curve with the JWST MIRI/LRS instrument. The observed eclipse shapes deviate significantly from those expected for a planet emitting uniformly over its surface. We fit a map to this deviation, constructed from spherical harmonics up to order ℓmax=2 , alongside the planetary, orbital, stellar, and systematic parameters. This yields a map with a meridionally averaged eastward hot-spot shift of (7.75 ± 0.36)°, with no significant degeneracy between the map and the additional parameters. We show the latitudinal and longitudinal contributions of the dayside emission structure to the eclipse shape, finding a latitudinal signal of ∼200 ppm and a longitudinal signal of ∼250 ppm. To investigate the sensitivity of the map to the method, we fix the parameters not used for mapping and derive an “eigenmap” fitted with an optimized number of orthogonal phase curves, which yields a similar map to the ℓmax=2 map. We also fit a map up to ℓmax=3 , which shows a smaller hot-spot shift, with a larger uncertainty. These maps are similar to those produced by atmospheric simulations. We conclude that there is a significant mapping signal which constrains the spherical harmonic components of our model up to ℓmax=2 . Alternative mapping models may derive different structures with smaller-scale features; we suggest that further observations of WASP-43b and other planets will drive the development of more robust methods and more accurate maps.
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Atmospheric Retrievals of the Phase-resolved Spectra of Irradiated Brown Dwarfs WD-0137B and EPIC-2122B

The Astrophysical Journal American Astronomical Society 968:2 (2024) 126

Authors:

Joshua D Lothringer, Yifan Zhou, Dániel Apai, Xianyu Tan, Vivien Parmentier, Sarah L Casewell
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Into the red: an M-band study of the chemistry and rotation of β Pictoris b at high spectral resolution

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 531:2 (2024) 2356-2378

Authors:

Luke T Parker, Jayne L Birkby, Rico Landman, Joost P Wardenier, Mitchell E Young, Sophia R Vaughan, Lennart van Sluijs, Matteo Brogi, Vivien Parmentier, Michael R Line
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Hot Jupiter diversity and the onset of TiO/VO revealed by a large grid of non-grey global circulation models

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 531:1 (2024) 1056-1083

Authors:

Alexander Roth, Vivien Parmentier, Mark Hammond
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Time-resolved Hubble Space Telescope Wide Field Camera 3 Spectrophotometry Reveals Inefficient Day-to-night Heat Redistribution in the Highly Irradiated Brown Dwarf SDSS 1557B

The Astrophysical Journal American Astronomical Society 966:1 (2024) 4

Authors:

Rachael C Amaro, Dániel Apai, Ben WP Lew, Yifan Zhou, Joshua D Lothringer, Sarah L Casewell, Xianyu Tan, Travis Barman, Mark S Marley, LC Mayorga, Vivien Parmentier
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