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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

Hatzes, Artie P. ; Gandolfi, Davide ; Korth, Judith LU ; Rodler, Florian ; Sabotta, Silvia ; Esposito, Massimiliano ; Barragán, Oscar ; Van Eylen, Vincent ; Livingston, John H. and Serrano, Luisa Maria , et al. (2022) In Astronomical Journal 163(5).
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 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... (More)

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.

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publishing date
type
Contribution to journal
publication status
published
in
Astronomical Journal
volume
163
issue
5
article number
223
publisher
IOP Publishing
external identifiers
  • scopus:85129589412
ISSN
0004-6256
DOI
10.3847/1538-3881/ac5dcb
language
English
LU publication?
no
additional info
Publisher Copyright: © 2022. The Author(s). Published by the American Astronomical Society.
id
1da25d1f-f40e-4fa2-94ec-18edc9d1310b
date added to LUP
2023-02-01 09:28:10
date last changed
2023-02-06 11:52:55
@article{1da25d1f-f40e-4fa2-94ec-18edc9d1310b,
  abstract     = {{<p>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.</p>}},
  author       = {{Hatzes, Artie P. and Gandolfi, Davide and Korth, Judith and Rodler, Florian and Sabotta, Silvia and Esposito, Massimiliano and Barragán, 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 Kabáth, 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 Cuesta, Lucía González and Chaturvedi, Priyanka and Carleo, Ilaria and Cabrera, Juan and Beck, Paul G. and Albrecht, Simon}},
  issn         = {{0004-6256}},
  language     = {{eng}},
  month        = {{05}},
  number       = {{5}},
  publisher    = {{IOP Publishing}},
  series       = {{Astronomical Journal}},
  title        = {{A Radial Velocity Study of the Planetary System of <i>π</i> Mensae : Improved Planet Parameters for <i>π</i> Mensae c and a Third Planet on a 125 Day Orbit}},
  url          = {{http://dx.doi.org/10.3847/1538-3881/ac5dcb}},
  doi          = {{10.3847/1538-3881/ac5dcb}},
  volume       = {{163}},
  year         = {{2022}},
}