Astronomy and Astrophysics – Astrophysics – Earth and Planetary Astrophysics
Scientific paper
2011-11-21
Astronomy and Astrophysics
Astrophysics
Earth and Planetary Astrophysics
ApJ accepted, 9 pages, 9 figures
Scientific paper
We measure a tilt of 86+-6 deg between the sky projections of the rotation axis of the WASP-7 star, and the orbital axis of its close-in giant planet. This measurement is based on observations of the Rossiter-McLaughlin (RM) effect with the Planet Finder Spectrograph on the Magellan II telescope. The result conforms with the previously noted pattern among hot-Jupiter hosts, namely, that the hosts lacking thick convective envelopes have high obliquities. Because the planet's trajectory crosses a wide range of stellar latitudes, observations of the RM effect can in principle reveal the stellar differential rotation profile; however, with the present data the signal of differential rotation could not be detected. The host star is found to exhibit radial-velocity noise (``stellar jitter') with an amplitude of ~30m/s over a timescale of days.
Albrecht Simon
Butler Paul R.
Crane Jeffrey D.
Hirano Teruyuki
Shectman Stephen A.
No associations
LandOfFree
A High Stellar Obliquity in the WASP-7 Exoplanetary System does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A High Stellar Obliquity in the WASP-7 Exoplanetary System, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A High Stellar Obliquity in the WASP-7 Exoplanetary System will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-551228