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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

Hatzes, Artie P. and Gandolfi, Davide and Korth, Judith and Rodler, Florian and Sabotta, Silvia and Esposito, Massimiliano and Barragan, Oscar and Van Eylen, Vincent and Livingston, John H. and Serrano, Luisa Maria and Luque, Rafael and Smith, Alexis M.S. and Redfield, Seth and Persson, Carina M. and Pätzold, Martin and Palle, Enric and Nowak, Grzegorz and Osborne, Hannah L.M. and Narita, Norio and Mathur, Savita and Lam, Kristine W.F. and Kabath, Petr and Johnson, Marshall C. and Guenther, Eike W. and Grziwa, Sascha and Goffo, Elisa and Fridlund, Malcolm and Endl, Michael and Deeg, Hans J. and Csizmadia, Szilard and Cochran, William D. and González Cuesta, Lucía and Chaturvedi, Priyanka and Carleo, Ilaria and Cabrera Perez, Juan and Beck, Paul G. and Albrecht, Simon (2022) 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. The Astronomical Journal, 163 (5), p. 223. IOP Publishing. doi: 10.3847/1538-3881/ac5dcb. ISSN 0004-6256.

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Official URL: https://iopscience.iop.org/article/10.3847/1538-3881/ac5dcb

Abstract

Pi 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, Pi Men c, as K_c = 1.21 ± 0.12 m/s, resulting in a planet mass of M_c = 3.63 ± 0.38 Mearth. A planet radius of R_c = 2.145 ± 0.015 Rearth yields a bulk density of rho_c = 2.03 ± 0.22 g/cm³. The precisely determined density of this planet and the brightness of the host star make Pi Men c an excellent laboratory for internal structure and atmospheric characterization studies. Our HARPS RV measurements also reveal compelling evidence for a third body, Pi Men d, with a minimum mass M d sin i_d = 13.38 ± 1.35 Mearth 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 Pi 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, Pi Men is an important planetary system for dynamical and formation studies.

Item URL in elib:https://elib.dlr.de/189917/
Document Type:Article
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
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Hatzes, Artie P.Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, GermanyUNSPECIFIED
Gandolfi, DavideDipartimento di Fisica, Universita degli Studi di Torino, via Pietro Giuria 1, I-10125, Torino, Italyhttps://orcid.org/0000-0001-8627-9628
Korth, JudithDepartment of Space, Earth and Environment, Astronomy and Plasma Physics, Chalmers University of Technology, SE-41296 Gothenburg, SwedenUNSPECIFIED
Rodler, FlorianEuropean Southern Observatory(ESO), Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago de Chile, ChileUNSPECIFIED
Sabotta, SilviaLandessternwarte, Zentrum für Astronomie der Universität Heidelberg, Königstuhl 12, D-69117 Heidelberg, GermanyUNSPECIFIED
Esposito, MassimilianoThuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, GermanyUNSPECIFIED
Barragan, OscarOxford Astrophysics, Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UKUNSPECIFIED
Van Eylen, VincentMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UKUNSPECIFIED
Livingston, John H.Department of Astronomy, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan 0000-0002-4881-3620UNSPECIFIED
Serrano, Luisa MariaDipartimento di Fisica, Universita degli Studi di Torino, via Pietro Giuria 1, I-10125, Torino, Italyhttps://orcid.org/0000-0001-8627-9628
Luque, RafaelInstituto de Astrofísica de Andalucía (IAA-CSIC), E-18008, Granada, SpainUNSPECIFIED
Smith, Alexis M.S.alexis.smith (at) dlr.dehttps://orcid.org/0000-0002-2386-4341
Redfield, SethAstronomy Department and Van Vleck Observatory, Wesleyan University, Middletown, CT 06459, USAhttps://orcid.org/0000-0003-3786-3486
Persson, Carina M.Department of Space, Earth and Environmanet, Chalmers University of Technology, Onsala space Observatory, SE-439 92 Onsala SwedenUNSPECIFIED
Pätzold, MartinRheinisches Institut fur Umweltforschung an der Universitat zu Köln, Aachener Strasse 209, D-50931 Koln, GermanyUNSPECIFIED
Palle, EnricInstituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain; Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, SpainUNSPECIFIED
Nowak, GrzegorzInstituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain; Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, Spain 0000-0002-7031-7754UNSPECIFIED
Osborne, Hannah L.M.Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UKUNSPECIFIED
Narita, NorioDepartment of Astronomy, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan; Instituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain; Astrobiology Center, NINS, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ; NationUNSPECIFIED
Mathur, SavitaInstituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain; Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, SpainUNSPECIFIED
Lam, Kristine W.F.kristine.lam (at) dlr.deUNSPECIFIED
Kabath, PetrAstronomical Institute, Czech Academy of Sciences, Fricova 298, 25165, Ondrejov, Czech Republic 0000-0002-1623-5352UNSPECIFIED
Johnson, Marshall C.Department of Astronomy, The Ohio State University, 140 West 18th Ave., Columbus, OH 43210, USAUNSPECIFIED
Guenther, Eike W.Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, GermanyUNSPECIFIED
Grziwa, SaschaRheinisches Institut für Umweltforschung an der Universität zu Köln, Aachener Strasse 209, D-50931 Köln, GermanyUNSPECIFIED
Goffo, ElisaDipartimento di Fisica, Università degli Studi di Torino, via PietroGiuria 1, I-10125, Torino, Italy ; Thüringer Landessternwarte Tautenburg, GermanyUNSPECIFIED
Fridlund, MalcolmDepartment of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, SE-439 92 Onsala, Sweden ; Leiden Observatory, University of Leiden, PO Box 9513, 2300 RA, Leiden, The Netherlands 0000-0003-2180-9936UNSPECIFIED
Endl, MichaelDepartment of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USAhttps://orcid.org/0000-0002-7714-6310
Deeg, Hans J.Instituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain ; Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, Spain 0000-0003-0047-4241UNSPECIFIED
Csizmadia, Szilardszilard.csizmadia (at) dlr.deUNSPECIFIED
Cochran, William D.Department of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USAhttps://orcid.org/0000-0001-9662-3496
González Cuesta, LucíaInstituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain ; Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, Spain 0000-0003-0047-4241UNSPECIFIED
Chaturvedi, PriyankaThuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenberg, GermanyUNSPECIFIED
Carleo, IlariaInstituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain; Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, SpainUNSPECIFIED
Cabrera Perez, JuanJuan.Cabrera (at) dlr.dehttps://orcid.org/0000-0001-6653-5487
Beck, Paul G.Instituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38205 La Laguna, Spain ; Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, SpainUNSPECIFIED
Albrecht, SimonStellar Astrophysics Centre, Dep. of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, DenmarkUNSPECIFIED
Date:May 2022
Journal or Publication Title:The Astronomical Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:163
DOI:10.3847/1538-3881/ac5dcb
Page Range:p. 223
Publisher:IOP Publishing
ISSN:0004-6256
Status:Published
Keywords:Exoplanet systems, 484, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO - PMC and Science
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Lam, Wai Fun
Deposited On:10 Nov 2022 10:22
Last Modified:10 Nov 2022 10:22

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