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Main Title: 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
Author(s): Hatzes, Artie P.
Gandolfi, Davide
Korth, Judith
Rodler, Florian
Sabotta, Silvia
Esposito, Massimiliano
Barragán, Oscar
Van Eylen, Vincent
Livingston, John H.
Serrano, Luisa Maria
Luque, Rafael
Smith, Alexis M. S.
Redfield, Seth
Persson, Carina M.
Pätzold, Martin
Palle, Enric
Nowak, Grzegorz
Osborne, Hannah L. M.
Narita, Norio
Mathur, Savita
Lam, Kristine W. F.
Kabáth, Petr
Johnson, Marshall C.
Guenther, Eike W.
Grziwa, Sascha
Goffo, Elisa
Fridlund, Malcolm
Endl, Michael
Deeg, Hans J.
Csizmadia, Szilard
Cochran, William D.
Cuesta, Lucía González
Chaturvedi, Priyanka
Carleo, Ilaria
Cabrera, Juan
Beck, Paul G.
Albrecht, Simon
Type: Article
Abstract: 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 Kc = 1.21 ± 0.12 m s−1, resulting in a planet mass of Mc = 3.63 ± 0.38 M⊕. A planet radius of Rc = 2.145 ± 0.015 R⊕ yields a bulk density of ρc = 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 Md sin id = 13.38 ± 1.35 M⊕ orbiting with a period of Porb,d = 125 days on an eccentric orbit (ed = 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.
Subject(s): radial velocity
planetary system
π Mensae
Transiting Exoplanet Survey Satellite
Issue Date: 20-Apr-2022
Date Available: 10-May-2022
Language Code: en
DDC Class: 520 Astronomie und zugeordnete Wissenschaften
Sponsor/Funder: DFG, 313698196, SPP 1992: Exploration der Diversität extrasolarer Planeten
Journal Title: The Astronomical Journal
Publisher: IOP
Volume: 163
Issue: 5
Article Number: 223
Publisher DOI: 10.3847/1538-3881/ac5dcb
EISSN: 1538-3881
ISSN: 0004-6256
TU Affiliation(s): Fak. 2 Mathematik und Naturwissenschaften » Zentrum für Astronomie und Astrophysik
Appears in Collections:Technische Universität Berlin » Publications

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