A Radial Velocity Study of the Planetary System of π Mensae: Improved Planet Parameters for pi Mensae c and a Third Planet on a 125 Day Orbit
Artikel i vetenskaplig tidskrift, 2022
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.
Författare
A. Hatzes
Universita degli Studi di Torino
D. Gandolfi
Universita degli Studi di Torino
Judith Korth
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
F. Rodler
European Southern Observatory Santiago
S. Sabotta
Landessternwarte Heidelberg-Königstuhl
M. Esposito
Thüringer Landessternwarte Tautenburg
O. Barragán
University of Oxford
Vincent Van Eylen
University College London (UCL)
J.H. Livingston
University of Tokyo
L. M. Serrano
Universita degli Studi di Torino
R. Luque
Consejo Superior de Investigaciones Científicas (CSIC)
Alexis M. S. Smith
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
S. Redfield
Wesleyan University
Carina Persson
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Martin Pätzold
Universität zu Köln
Enric Palle
Instituto de Astrofísica de Canarias
Universidad de la Laguna
G. Nowak
Universidad de la Laguna
Instituto de Astrofísica de Canarias
H. L.M. Osborne
University College London (UCL)
Norio Narita
National Institutes of Natural Sciences
Instituto de Astrofísica de Canarias
Japan Science and Technology Agency
National Astronomical Observatory of Japan
University of Tokyo
S. Mathur
Universidad de la Laguna
Instituto de Astrofísica de Canarias
K. W.F. Lam
Technische Universität Berlin
Petr Kabath
Czech Academy of Sciences
M.C. Johnson
Las Cumbres Observatory Global Telescope Network
E. W. Guenther
Thüringer Landessternwarte Tautenburg
S. Grziwa
Universität zu Köln
E. Goffo
Universita degli Studi di Torino
Malcolm Fridlund
Universiteit Leiden
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
M. Endl
University of Texas
H. Deeg
Instituto de Astrofísica de Canarias
Universidad de la Laguna
Szilárd Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
William D. Cochran
University of Texas
Lucá Gonzalez Cuesta
Instituto de Astrofísica de Canarias
Universidad de la Laguna
Priyanka Chaturvedi
Thüringer Landessternwarte Tautenburg
Ilaria Carleo
Wesleyan University
J. Cabrera
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
P. G. Beck
Karl-Franzens-Universität Graz
Simon Albrecht
Aarhus Universitet
Astronomical Journal
0004-6256 (ISSN) 1538-3881 (eISSN)
Vol. 163 5 223Exoplaneter från rymden - CHEOPS och PLATO, ESA's nästa två rymdteleskop (fas 2)
Rymdstyrelsen (65/19), 2020-01-01 -- 2022-12-31.
Rymdstyrelsen (177/19), 2020-01-01 -- 2022-12-31.
Ämneskategorier (SSIF 2011)
Astronomi, astrofysik och kosmologi
Annan fysik
Den kondenserade materiens fysik
DOI
10.3847/1538-3881/ac5dcb