J/A+A/631/A136 7 CMa system velocity curves (Luque+, 2019)
Precise radial velocities of giant stars.
XIII. A second Jupiter orbiting in 4:3 resonance in the 7 CMa system.
Luque R., Trifonov T., Reffert S., Quirrenbach A., Lee M.H., Albrecht S.,
Fredslund Andersen M., Antoci V., Grundahl F., Schwab C., Wolthoff V.
<Astron. Astrophys. 631, A136 (2019)>
=2019A&A...631A.136L 2019A&A...631A.136L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities
Keywords: techniques: radial velocities - planetary systems -
planets and satellites: detection -
planets and satellites: dynamical evolution and stability
Abstract:
We report the discovery of a second planet orbiting the K giant star
7 CMa based on 166 high-precision radial velocities obtained with
Lick, HARPS, UCLES and SONG. The periodogram analysis reveals two
periodic signals of approximately 745 and 980d, associated to
planetary companions. A double-Keplerian orbital fit of the data
reveals two Jupiter-like planets with minimum masses Mbsini∼1.9Mj
and Mcsini∼0.9Mj, orbiting at semi-major axes of ab∼1.75au and
ac∼2.15au, respectively. Given the small orbital separation and the
large minimum masses of the planets close encounters may occur within
the time baseline of the observations, thus, a more accurate N-body
dynamical modeling of the available data is performed. The dynamical
best-fit solution leads to collision of the planets and we explore the
long-term stable configuration of the system in a Bayesian framework,
confirming that 13% of the posterior samples are stable for at least
10Myr. The result from the stability analysis indicates that the
two-planets are trapped in a low-eccentricity 4:3 mean-motion
resonance. This is only the third discovered system to be inside a 4:3
resonance, making it very valuable for planet formation and orbital
evolution models.
Description:
Radial velocities of 7 CMa from Lick, HARPS, UCLES and SONG.
Objects:
---------------------------------------------
RA (2000) DE Designation(s)
---------------------------------------------
06 36 41.037 -19 15 21.16 7 CMa = HD 47205
---------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 35 307 7 CMa radial velocities
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.4 d BJD Barycentric Julian date of observation
14- 19 F6.1 m/s RV Radial velocity (1)
21- 24 F4.1 m/s e_RV Radial velocity uncertainty
26- 35 A10 -- Inst Instrument
--------------------------------------------------------------------------------
Note (1): Relative velocities for HARPS-post, HARPS-pre, Lick and UCLES
instruments.
--------------------------------------------------------------------------------
Acknowledgements:
Rafael Luque, rluque(at)iac.es
References:
Hekker et al., Paper I 2006A&A...454..943H 2006A&A...454..943H
Reffert et al., Paper II 2006ApJ...652..661R 2006ApJ...652..661R
Hekker & Malendez, Paper III 2007A&A...475.1003H 2007A&A...475.1003H, Cat. J/A+A/475/1003
Hekker et al., Paper IV 2008A&A...480..215H 2008A&A...480..215H
Mitchell et al., Paper V 2013A&A...555A..87M 2013A&A...555A..87M
Trifonov et al., Paper VI 2014A&A...568A..64T 2014A&A...568A..64T
Reffert et al., Paper VII 2015A&A...574A.116R 2015A&A...574A.116R, Cat. J/A+A/574/A116
Trifonov et al., Paper VIII 2015A&A...582A..54T 2015A&A...582A..54T
Ortiz et al., Paper IX 2016A&A...595A..55O 2016A&A...595A..55O, Cat. J/A+A/595/A55
Stock et al., Paper X 2018A&A...616A..33S 2018A&A...616A..33S, cat. J/A+A/616/A33
Quirrenbach et al., Paper XI 2019A&A...624A..18Q 2019A&A...624A..18Q, Cat. J/A+A/624/A18
Reichert et al., Paper XII 2019A&A...625A..22R 2019A&A...625A..22R
(End) Rafael Luque [IAC, Spain], Patricia Vannier [CDS] 14-Oct-2019