Spin-Orbit Alignment for the Eccentric Exoplanet HD 147506b
Abstract
The short-period exoplanet HD 147506b (also known as HAT-P-2b) has an eccentric orbit, raising the possibility that it migrated through planet-planet scattering or Kozai oscillations accompanied by tidal dissipation. Either of these scenarios could have significantly tilted the orbit relative to the host star's equatorial plane. Here we present spectroscopy of a transit of HD 147506b and assess the spin-orbit alignment via the Rossiter-McLaughlin effect. We find the angle between the sky projections of the stellar spin axis and orbital axis to be aligned within 14°. Thus, we find no corroborating evidence for scattering or Kozai migration, although these scenarios cannot be ruled out with the present data.
Additional Information
© 2007 American Astronomical Society. Received 2007 June 11; accepted 2007 July 5; published 2007 August 6. Data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration, and was made possible by the generous financial support of the W. M. Keck Foundation. We thank D. Fabrycky and S. Gaudi for helpful comments on the manuscript. We are very grateful to Michael Bolte, Jennifer Johnson, and David Lai for swapping Keck nights on short notice. G. Á. B. was supported by NASA through a Hubble Fellowship Grant HST-HF-01170.01. We recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.Attached Files
Published - 1538-4357_665_2_L167.pdf
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Additional details
- Eprint ID
- 37438
- Resolver ID
- CaltechAUTHORS:20130311-105950864
- NASA Hubble Fellowship
- HST-HF-01170.01-A
- Created
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2013-03-11Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field