English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

WASP-33b, a hot Jupiter around a hot star, is a rare system in which nodalprecession has been discovered. We updated the model for the nodal precessionof WASP-33b by adding new observational points. Consequently, we found a motionof the nodal precession spanning 11 years. We present homogenous Dopplertomographic analyses of eight datasets, including two new datasets from TS23and HIDES, obtained between 2008 and 2019, to illustrate the variations in theprojected spin-orbit obliquity of WASP-33b and its impact parameter. We alsopresent its impact parameters based on photometric transit observationscaptured by MuSCAT in 2017 and MuSCAT2 in 2018. We derived its real spin-orbitobliquity $\psi$, stellar spin inclination $i_{s}$, and stellar gravitationalquadrupole moment $J_2$ from the time variation models of the two orbitalparameters. We obtained $\psi = 108.19^{+0.95}_{-0.97}$ deg, $i_s =58.3^{+4.6}_{-4.2}$ deg, and $J_2=(1.36^{+0.15}_{-0.12}) \times 10^{-4}$. Our$J_2$ value was slightly smaller than the theoretically predicted value, whichmay indicate that its actual stellar internal structure is different from thetheoretical one. We derived the nodal precession speed$\dot{\theta}=0.507^{+0.025}_{-0.022}$ deg year$^{-1}$, and its period$P_{\mathrm{pre}}=709^{+33}_{-34}$ years, and found that WASP-33b transits infront of WASP-33 for only $\sim$ 20 \% of the entire nodal precession period.

Nodal Precession of WASP-33b for Eleven Years by Doppler Tomographic and Transit Photometric Observations