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

Instituto de Astrofisica de Andalucía (IAA)

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

Universidad de la Laguna

Instituto de Astrofísica de Canarias

G. Nowak

Universidad de la Laguna

Instituto de Astrofísica de Canarias

H. L.M. Osborne

University College London (UCL)

Norio Narita

National Astronomical Observatory of Japan

Japan Science and Technology Agency

Instituto de Astrofísica de Canarias

University of Tokyo

National Institutes of Natural Sciences

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

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

Universiteit Leiden

M. Endl

The University of Texas at Austin

H. Deeg

Instituto de Astrofísica de Canarias

Universidad de la Laguna

Szilárd Csizmadia

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

William D. Cochran

The University of Texas at Austin

Lucá Gonzalez Cuesta

Universidad de la Laguna

Instituto de Astrofísica de Canarias

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 5 223

Exoplaneter från rymden - CHEOPS och PLATO, ESA's nästa två rymdteleskop (fas 2)

Rymdstyrelsen (177/19), 2020-01-01 -- 2022-12-31.

Rymdstyrelsen (65/19), 2020-01-01 -- 2022-12-31.

Ämneskategorier

Astronomi, astrofysik och kosmologi

Annan fysik

Den kondenserade materiens fysik

DOI

10.3847/1538-3881/ac5dcb

Mer information

Senast uppdaterat

2023-01-20