NDLI: A HIGH STELLAR OBLIQUITY IN THE WASP-7 EXOPLANETARY SYSTEM

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A HIGH STELLAR OBLIQUITY IN THE WASP-7 EXOPLANETARY SYSTEM

Content Provider	Scilit
Author	Albrecht, Simon Winn, Joshua N. Butler, R. Paul Crane, Jeffrey D. Shectman, Stephen A. Thompson, Ian B. Hirano, Teruyuki Wittenmyer, Robert A.
Copyright Year	2011
Description	Journal: The Astrophysical Journal We measure a tilt of 86° ± 6° 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 ≈30 m $s^{–1}$ over a timescale of days.
Related Links	http://iopscience.iop.org/article/10.1088/0004-637X/744/2/189/pdf
ISSN	0004637X
DOI	10.1088/0004-637x/744/2/189
Journal	The Astrophysical Journal
Issue Number	2
Volume Number	744
Language	English
Publisher	IOP Publishing
Publisher Date	2011-12-22
Access Restriction	Open
Subject Keyword	Journal: The Astrophysical Journal Astronomy and Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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