Year: 2007
Type: article
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.
Source: The Astrophysical Journal
DOI: 10.1086/521362
Authors: Joshua N. Winn, John Asher Johnson, Kathryn M. G. Peek, Geoffrey W. Marcy, Gaspar Á. Bakos, Keigo Enya, Norio Narita, Yasushi Suto, Edwin L. Turner, Steven S. Vogt
Institutions: Massachusetts Institute of Technology, University of California, Berkeley, Center for Astrophysics Harvard & Smithsonian, Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, The University of Tokyo, Princeton University, University of California, Santa Cruz
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2129967205