1 research outputs found
Magnetic Drag and 3-D Effects in Theoretical High-Resolution Emission Spectra of Ultrahot Jupiters: the Case of WASP-76b
Ultrahot Jupiters are ideal candidates to explore with high-resolution
emission spectra. Detailed theoretical studies are necessary to investigate the
range of spectra we can expect to see from these objects throughout their
orbit, because of the extreme temperature and chemical longitudinal gradients
that exist across day and nightside regions. Using previously published 3D GCM
models of WASP-76b with different treatments of magnetic drag, we post-process
the 3D atmospheres to generate high-resolution emission spectra for two
wavelength ranges and throughout the planet's orbit. We find that the
high-resolution emission spectra vary strongly as a function of phase, at times
showing emission features, absorption features, or both, which are a direct
result of the 3D structure of the planet. At phases exhibiting both emission
and absorption features, the Doppler shift differs in direction between the two
spectral features, making them differentiable instead of canceling each other
out. Through the use of cross-correlation, we find different patterns in net
Doppler shift for models with different treatments of drag: the nightside
spectra show opposite signs in their Doppler shift, while the dayside phases
have a reversal in the trend of net shift with phase. Finally, we caution
researchers from using a single spectral template throughout the planet's
orbit; this can bias the corresponding net Doppler shift returned, as it can
pick up on a bright region on the edge of the planet disk that is highly red-
or blue-shifted.Comment: 15 pages, 9 figures (including one animated figure), Accepted to AJ;
Link to animated figure: https://www.youtube.com/watch?v=KnghwJdZxH