NDLI: Classical and relativistic node precessional effects in WASP-33b and perspectives for detecting them

Content Provider	Springer Nature Link
Author	Iorio, Lorenzo
Copyright Year	2010
Abstract	WASP-33 is a fast rotating, main sequence star which hosts a hot Jupiter moving along a retrograde and almost polar orbit with semi-major axis a=0.02 au and eccentricity provisionally set to e=0. The quadrupole mass moment $J_{2}^{\star}$ and the proper angular momentum S ⋆ of the star are 1900 and 400 times, respectively, larger than those of the Sun. Thus, huge classical and general relativistic non-Keplerian orbital effects should take place in such a system. In particular, the large inclination Ψ⋆ of the orbit of WASP-33b to the star’s equator allows to consider the node precession $\dot{\Omega}$ and the related time variation dt d/dt of the transit duration t d. The WASP-33b node rate due to $J_{2}^{\star}$ is 9×109 times larger than the same effect for Mercury induced by the Sun’s oblateness, while the general relativistic gravitomagnetic node precession is 3×105 times larger than the Lense-Thirring effect for Mercury due to the Sun’s rotation. We also consider the effect of the centrifugal oblateness of the planet itself and of a putative distant third body X. The magnitudes of the induced time change in the transit duration are of the order of 3×10−6,2×10−7,8×10−9 for $J_{2}^{\star}$ , the planet’s rotational oblateness and general relativity, respectively. A yet undiscovered planet X with the mass of Jupiter orbiting at more than 1 au would induce a transit duration variation of less than 4×10−9. A conservative evaluation of the accuracy in measuring dt d/dt over 10 yr points towards ≈10−8. The analysis presented here will be applicable also to other exoplanets with similar features if and when they will ne discovered.
Starting Page	485
Ending Page	496
Page Count	12
File Format	PDF
ISSN	0004640X
Journal	Astrophysics and Space Science
Volume Number	331
Issue Number	2
e-ISSN	1572946X
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-09-02
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gravitation Planetary systems: individual (WASP-33b) Stars: individual (WASP33) Stars: rotation Stars: binaries: eclipsing Astronomy, Observations and Techniques
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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