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

  title={A Radial Velocity Study of the Planetary System of $\pi$ Mensae: Improved Planet Parameters for $\pi$ Mensae c and a Third Planet on a 125 Day Orbit},
  author={Artie P. Hatzes and Davide Gandolfi and Judith Korth and Florian Rodler and Silvia Sabotta and Massimiliano Esposito and Oscar Barrag{\'a}n and Vincent Van Eylen and John H. Livingston and Luisa Maria Serrano and Rafael Luque and Alexis M. S. Smith and Seth Redfield and Carina M. Persson and Martin Paetzold and Enric Palle and Grzegorz Nowak and Hannah L. M. Osborne and Norio Narita and Savita Mathur and Kristine W. F. Lam and Petr Kab{\'a}th and Marshall C. Johnson and Eike Guenther and Sascha Grziwa and Elisa Goffo and Malcolm Fridlund and Michael Endl and Hans J. Deeg and Szil{\'a}rd Csizmadia and William D. Cochran and Lucia Gonzalez Cuesta and Priyanka Chaturvedi and Ilaria Carleo and Juan Cabrera and Paul G. Beck and Simon H. Albrecht},
  journal={The Astronomical Journal},
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… 


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