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Yayınlanmış 1 Ocak 2020 | Sürüm v1
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TESS asteroseismology of the known planet host star lambda(2) Fornacis

Oluşturanlar

  • 1. Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England
  • 2. Florida Gulf Coast Univ, Dept Chem & Phys, 10501 FGCU Blvd, Ft Myers, FL 33965 USA
  • 3. Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA
  • 4. Univ Calif Riverside, Dept Earth & Planetary Sci, Riverside, CA 92521 USA
  • 5. Univ Paris, Sorbonne Univ, Univ PSL, LESIA,Observ Paris,CNRS, F-92195 Meudon, France
  • 6. Ege Univ, Fac Ege, Dept Astron & Space Sci, TR-35100 Izmir, Turkey
  • 7. TIFR, Homi Bhabha Ctr Sci Educ, VN Purav Marg, Mumbai 400088, Maharashtra, India

Açıklama

Context. The Transiting Exoplanet Survey Satellite (TESS) is observing bright known planet-host stars across almost the entire sky. These stars have been subject to extensive ground-based observations, providing a large number of radial velocity measurements.Aims. The objective of this work is to use the new TESS photometric observations to characterize the star lambda (2) Fornacis, and following this to update the parameters of the orbiting planet lambda (2) For b.Methods. We measured the frequencies of the p-mode oscillations in lambda (2) For, and in combination with non-seismic parameters estimated the stellar fundamental properties using stellar models. Using the revised stellar properties and a time series of archival radial velocities from the UCLES, HIRES and HARPS instruments spanning almost 20 years, we refit the orbit of lambda (2) For b and searched the residual radial velocities for remaining variability.Results. We find that lambda (2) For has a mass of 1.160.03 M-circle dot and a radius of 1.63 +/- 0.04 R-circle dot, with an age of 6.3 +/- 0.9 Gyr. This and the updated radial velocity measurements suggest a mass of lambda (2) For b of

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