J/AJ/163/223 Radial velocity study of π Mensae (Hatzes+, 2022)
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 A.P., Gandolfi D., Korth J., Rodler F., Sabotta S., Esposito M.,
Barragan O., Van Eylen V., Livingston J.H., Serrano L.M., Luque R.,
Smith A.M.S., Redfield S., Persson C.M., Patzold M., Palle E., Nowak G.,
Osborne H.L.M., Narita N., Mathur S., Lam K.W.F., Kabath P., Johnson M.C.,
Guenther E.W., Grziwa S., Goffo E., Fridlund M., Endl M., Deeg H.J.,
Csizmadia S., Cochran W.D., Cuesta L.G., Chaturvedi P., Carleo I.,
Cabrera J., Beck P.G., Albrecht S.
<Astron. J., 163, 223 (2022)>
=2022AJ....163..223H 2022AJ....163..223H
ADC_Keywords: Exoplanets; Stars, high-velocity; Radial velocities;
Spectra, optical
Keywords: Exoplanet systems
Abstract:
π Men hosts a transiting planet detected by the Transiting
Exoplanet Survey Satellite space mission and an outer planet in a
5.7yr orbit discovered by radial velocity (RVel) surveys. We studied
this system using new RVel measurements taken with the HARPS
spectrograph on ESO's 3.6m telescope, as well as archival data. We
constrain the stellar RVel semiamplitude due to the transiting planet,
πMenc, as Kc=1.21±0.12m/s, resulting in a planet mass of
Mc=3.63±0.38M⊕. A planet radius of
Rc=2.145±0.015R⊕ yields a bulk density of
ρc=2.03±0.22g/cm3. The precisely determined density of this
planet and the brightness of the host star make πMenc an excellent
laboratory for internal structure and atmospheric characterization
studies. Our HARPS RVel measurements also reveal compelling evidence
for a third body, πMend, with a minimum mass
Mdsinid=13.38±1.35M⊕ orbiting with a period of
Porb,d=125days on an eccentric orbit (ed=0.22). A simple dynamical
analysis indicates that the orbit of πMend is stable on timescales
of at least 20Myr. Given the mutual inclination between the outer
gaseous giant and the inner rocky planet and the presence of a third
body at 125days, π Men is an important planetary system for
dynamical and formation studies.
Description:
Our radial velocity (RVel) data consist of archival and new
measurements from our ESO's HARPS large follow-up program. A total of
77 RVel measurements come from the UCLES spectrograph mounted on the
3.9m telescope of the Anglo Australian Telescope (AAT). Archival HARPS
data consisting of 145 RVel measurements (51 nightly averaged) were
also taken from the public archive of the European Southern
Observatory (ESO). We also included 275 RVel measurements (37 nightly
averaged) taken with the ESPRESSO spectrograph.
The new data for π Men were taken as part of our ESO observing
programs 0101.C-0829, 1102.C-0923, and 106.21TJ.001 (PI: Gandolfi) and
during technical nights (program IDs 60.A-9700 and 60.A-9709) on
HARPS. These consisted of 413 RV measurements 27 spanning 2018
September to 2020 December. Exposure times were 150-300s, resulting in
a median S/N of ∼250/pixel at 550nm.
Objects:
--------------------------------------------------
RA (2000) DE Designation(s)
--------------------------------------------------
05 37 09.89 -80 28 08.8 π Mensae = * pi. Men
--------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 63 402 RVel measurements and activity indicators
Large Programs
--------------------------------------------------------------------------------
See also:
II/122 : UBV Photoelectric Catalog: data 1953-1985 (Mermilliod 1987)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/ApJ/646/505 : Catalog of nearby exoplanets (Butler+, 2006)
J/A+A/468/1115 : Thorium and argon lines in the visible (Lovis+, 2007)
J/ApJ/715/1203 : υ Andromedae system with HST (McArthur+, 2010)
J/ApJS/200/15 : HARPS-TERRA project. I. (Anglada-Escude+, 2012)
J/A+A/580/A31 : Aldebaran radial velocity variations (Hatzes+, 2015)
J/AJ/154/109 : California-Kepler Survey. III. Planet radii (Fulton+, 2017)
J/AJ/156/264 : California-Kepler Survey VII Planet radius gap (Fulton+, 2018)
J/A+A/619/L10 : pi Men radial velocity curves (Gandolfi+, 2018)
J/A+A/609/A117 : CARMENES radial velocity curves of 7 M-dwarf (Trifonov+, 2018)
J/AJ/157/33 : Radial velocity exploration of εEridani (Mawet+, 2019)
J/A+A/642/A31 : pi Men radial velocity curves (Damasso+, 2020)
J/A+A/640/A73 : pi Men radial velocity curves (De Rosa+, 2020)
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 F14.6 d BJD [2458383/2459186] Barycentric Julian Date at TDB
16- 23 F8.2 m/s RVel [10695/11036] Radial Velocity
25- 28 F4.2 m/s e_RVel [0.27/1.49] Uncertainty in RVel
30- 37 F8.5 m/s BIS [3.05/12.9] Bisector inverse slope
39- 45 F7.5 m/s FWHM [7.66/7.69] Full-width at half-maximum
47- 54 F8.6 --- SHK [0.14/0.16] Ca II S-index
56- 63 F8.6 --- e_SHK [0.0002/0.003] Uncertainty in SHK
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 14-Sep-2022