A Prograde, Low-Inclination Orbit for the Very Hot Jupiter WASP-3b

Details A Prograde, Low-Inclination Orbit for the Very Hot Jupiter WASP-3b A Prograde, Low-Inclination Orbit for the Very Hot Jupiter WASP-3b

2010-04-05

arxiv.org/abs/1004.0692v2

Astrophys.J. 715 (2010) 421-428.

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

23 pages, 4 figures, Accepted for publication in The Astrophysical Journal, Replacement includes revised citations

Scientific paper

10.1088/0004-637X/715/1/421

We present new spectroscopic and photometric observations of the transiting exoplanetary system WASP-3. Spectra obtained during two separate transits exhibit the Rossiter-McLaughlin (RM) effect and allow us to estimate the sky-projected angle between the planetary orbital axis and the stellar rotation axis, lambda = 3.3^{+2.5}_{-4.4} degrees. This alignment between the axes suggests that WASP-3b has a low orbital inclination relative to the equatorial plane of its parent star. During our first night of spectroscopic measurements, we observed an unexpected redshift briefly exceeding the expected sum of the orbital and RM velocities by 140 m/s. This anomaly could represent the occultation of material erupting from the stellar photosphere, although it is more likely to be an artifact caused by moonlight scattered into the spectrograph.

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