Stellar variability of the exoplanet hosting star HD 63454

Stephen R. Kane, Diana Dragomir, David R. Ciardi, Jae Woo Lee, Gaspare Lo Curto, Christophe Lovis, Dominique Naef, Suvrath Mahadevan, Genady Pilyavsky, Stephane Udry, Xuesong Wang, Jason Wright

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

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 CaII 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.

Original languageEnglish (US)
Article number58
JournalAstrophysical Journal
Volume737
Issue number2
DOIs
StatePublished - Aug 20 2011

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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