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Judith Korth



A Radial Velocity Study of the Planetary System of π Mensae : Improved Planet Parameters for π Mensae c and a Third Planet on a 125 Day Orbit


  • Artie P. Hatzes
  • Davide Gandolfi
  • Judith Korth
  • Florian Rodler
  • Silvia Sabotta
  • Massimiliano Esposito
  • Oscar Barragán
  • Vincent Van Eylen
  • John H. Livingston
  • Luisa Maria Serrano
  • Rafael Luque
  • Alexis M.S. Smith
  • Seth Redfield
  • Carina M. Persson
  • Martin Pätzold
  • Enric Palle
  • Grzegorz Nowak
  • Hannah L.M. Osborne
  • Norio Narita
  • Savita Mathur
  • Kristine W.F. Lam
  • Petr Kabáth
  • Marshall C. Johnson
  • Eike W. Guenther
  • Sascha Grziwa
  • Elisa Goffo
  • Malcolm Fridlund
  • Michael Endl
  • Hans J. Deeg
  • Szilard Csizmadia
  • William D. Cochran
  • Lucía González Cuesta
  • Priyanka Chaturvedi
  • Ilaria Carleo
  • Juan Cabrera
  • Paul G. Beck
  • Simon Albrecht

Summary, in English

π Men hosts a transiting planet detected by the Transiting Exoplanet Survey Satellite space mission and an outer planet in a 5.7 yr orbit discovered by radial velocity (RV) surveys. We studied this system using new RV measurements taken with the HARPS spectrograph on ESO's 3.6 m telescope, as well as archival data. We constrain the stellar RV semiamplitude due to the transiting planet, π Men c, as K c = 1.21 ± 0.12 m s-1, resulting in a planet mass of M c = 3.63 ± 0.38 M. A planet radius of R c = 2.145 ± 0.015 R yields a bulk density of ρ c = 2.03 ± 0.22 g cm-3. The precisely determined density of this planet and the brightness of the host star make π Men c an excellent laboratory for internal structure and atmospheric characterization studies. Our HARPS RV measurements also reveal compelling evidence for a third body, π Men d, with a minimum mass M d sin i d = 13.38 ± 1.35 M orbiting with a period of P orb,d = 125 days on an eccentric orbit (e d = 0.22). A simple dynamical analysis indicates that the orbit of π Men d is stable on timescales of at least 20 Myr. Given the mutual inclination between the outer gaseous giant and the inner rocky planet and the presence of a third body at 125 days, π Men is an important planetary system for dynamical and formation studies.

Publishing year





Astronomical Journal





Document type

Journal article


IOP Publishing




  • ISSN: 0004-6256