The 21st Cambridge workshop on Cool Stars, Stellar Systems, and the Sun
Published November 22, 2022 | Version v1
Poster Open

X-ray Activity in SPI Candidate HD179949

Authors/Creators

  • 1. Max Planck Institute for Astrophysics Garching ; Indian Institute of Science Education and Research (IISER) - Mohali
  • 2. Smithsonian Astrophysical Observatory, Center for Astrophysics, Harvard & Smithsonian
  • 3. Indian Institute of Science Education and Research (IISER) - Mohali
  • 4. University of Texas at Arlington

Contributors

  • 1. CEA
  • 2. Observatoire de Grenoble
  • 3. IRAP

Description

We analyse Chandra X-ray data of HD179949, a Sun-like star with a close Jupiter-mass planet. We study short-term spectral variability as well as phase-dependent Star-Planet Interaction (SPI) effects. We model the observed spectra with a two-component thermal model and obtain robust estimates for abundances.  We find consistent estimates for change points across multiple passbands and evidence for short-term variability in spectral hardness. We also find evidence for X-ray variability related to the planetary orbit of the close Jupiter-mass planet.

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Additional details

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