SIMBAD references

2012ApJ...744..189A - Astrophys. J., 744, 189 (2012/January-2)

A high stellar obliquity in the WASP-7 exoplanetary system.

ALBRECHT S., WINN J.N., BUTLER R.P., CRANE J.D., SHECTMAN S.A., THOMPSON I.B., HIRANO T. and WITTENMYER R.A.

Abstract (from CDS):

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 over a timescale of days.

Abstract Copyright:

Journal keyword(s): planetary systems - planets and satellites: formation - planet-star interactions - stars: individual: WASP-7 - stars: rotation - techniques: spectroscopic

Simbad objects: 7

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