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Published August 20, 2011 | Published
Journal Article Open

Stellar Variability of the Exoplanet Hosting Star HD 63454

Abstract

Of the hundreds of exoplanets discovered using the radial velocity (RV) technique, many are orbiting close to their host stars with periods less than 10 days. One of these, HD 63454, is a young active K dwarf which hosts a Jovian planet in a 2.82 day period orbit. The planet has a 14% transit probability and a predicted transit depth of 1.2%. Here we provide a re-analysis of the RV data to produce an accurate transit ephemeris. We further analyze 8 nights of time series data to search for stellar activity both intrinsic to the star and induced by possible interactions of the exoplanet with the stellar magnetospheres. We establish the photometric stability of the star at the 3 mmag level despite strong Ca_(II) emission in the spectrum. Finally, we rule out photometric signatures of both star–planet magnetosphere interactions and planetary transit signatures. From this we are able to place constraints on both the orbital and physical properties of the planet.

Additional Information

© 2011 American Astronomical Society. Received 2011 April 23; accepted 2011 May 27; published 2011 August 3. The Center for Exoplanets and Habitable Worlds is supported by the Pennsylvania State University, the Eberly College of Science, and the Pennsylvania Space Grant Consortium. J.-W.L. acknowledges financial support from the Basic Science Research Program (grant no. 20100024954) and the Center for Galaxy Evolution Research through the National Research Foundation of Korea. This research has made use of the NASA/IPAC/NExScI Star and Exoplanet Database, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.

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August 22, 2023
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