Nodal Precession and Tidal Evolution of Two Hot Jupiters: WASP-33 b and KELT-9 b
Abstract
Hot Jupiters orbiting rapidly rotating stars on inclined orbits undergo tidally induced nodal precession measurable over several years of observations. The Hot Jupiters WASP-33 b and KELT-9 b are particularly interesting targets because they are among the hottest planets found to date, orbiting relatively massive stars. Here, we analyze archival and new data that span 11 and 5 yr for WASP-33 b and KELT-9 b, respectively, in order to model and improve upon their tidal precession parameters. Our work confirms the nodal precession for WASP-33 b and presents the first clear detection of the precession of KELT-9 b. We determine that WASP-33 and KELT-9 have gravitational quadrupole moments $({6.3}_{-0.8}^{+1.2})\times {10}^{-5}$ and $({3.26}_{-0.80}^{+0.93})\times {10}^{-4}$ , respectively. We estimate the planets' precession periods to be ${1460}_{-130}^{+170}$ yr and ${890}_{-140}^{+200}$ yr, respectively, and that they will cease to transit their host stars around the years ${2090}_{-10}^{+17}$ CE and ${2074}_{-10}^{+12}$ CE, respectively. Additionally, we investigate both planets' tidal and orbital evolution, suggesting that a high-eccentricity tidal migration scenario is possible to produce both system architectures and that they will most likely not be engulfed by their hosts before the end of their main-sequence lifetimes.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 2022
- DOI:
- 10.3847/1538-4357/ac6b9a
- arXiv:
- arXiv:2203.02546
- Bibcode:
- 2022ApJ...931..111S
- Keywords:
-
- Exoplanets;
- Hot Jupiters;
- Transits;
- Tidal interaction;
- Orbital nodes;
- 498;
- 753;
- 1711;
- 1699;
- 1180;
- Astrophysics - Earth and Planetary Astrophysics;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 14 pages, 9 figures, submitted to ApJ