J/AJ/168/115 Planetary eccentricity-period (PEP) distributions (Bashi+, 2024)
Different planetary eccentricity-period (PEP) distributions of small and giant
planets.
Bashi D., Mazeh T., Faigler S.
<Astron. J., 168, 115 (2024)>
=2024AJ....168..115B 2024AJ....168..115B
ADC_Keywords: Exoplanets; Colors; Magnitudes, absolute; Optical
Keywords: Exoplanets ; Exoplanet dynamics ; Exoplanet tides ;
Exoplanet evolution ; Astrostatistics techniques
Abstract:
We used the database of 1040 short-period (1≤P<200days) exoplanets
radial-velocity orbits to study the planetary eccentricity-period
(PEP) distribution. We first divided the sample into low- and
high-mass exoplanet subsamples based on the distribution of the
(minimum) planetary masses, which displays a clear two-Gaussian
distribution, separated at 0.165MJ. We then selected 216 orbits,
low- and high-mass alike, with eccentricities significantly distinct
from circular orbits. The 131 giant-planet eccentric orbits display a
clear upper envelope, which we model quantitatively, rises
monotonically from zero eccentricity and reaches an eccentricity of
0.8 at P∼100 days. Conversely, the 85 low-mass planetary orbits
display a flat eccentricity distribution between 0.1 and 0.5, with
almost no dependence on the orbital period. We show that the striking
difference between the two PEP distributions is not a result of the
detection technique used. The upper envelope of the high-mass planets,
also seen in short-period binary stars, is a clear signature of tidal
circularization, which probably took place inside the planets, while
the small-planet PEP distribution suggests that the circularization
was not effective, probably due to dynamical interactions with
neighboring planets.
Description:
For the study of the planetary eccentricity-period (PEP) distribution,
we used the Exoplanet Archive "Composite" catalog
(Akeson+ 2013PASP..125..989A 2013PASP..125..989A).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 106 85 Small planets (Mp<0.165Mup) properties used in the
analysis of the PEP distributions
table2.dat 94 131 Giant planets (Mp≥0.165Mup) properties used in the
analysis of the PEP distributions
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See also:
J/A+A/375/L27 : HD 80606b extremely elongated orbit (Naef+ 2001)
J/ApJ/742/116 : Phot. of four massive transiting exoplanets (Bakos+, 2011)
J/ApJS/197/8 : Kepler's cand. multiple transiting planets (Lissauer+, 2011)
J/MNRAS/414/1278 : Eccentricities of transiting planets (Pont+, 2011)
J/ApJ/824/15 : Orbital circularization of Kepler EBs (Van Eylen+, 2016)
J/A+A/602/A107 : 231 transiting planets eccentricity and mass (Bonomo+, 2017)
J/A+A/630/A135 : Beyond the exoplanet mass-radius relation (Ulmer-Moll+, 2019)
J/AJ/157/82 : TEMP. V. Phot. of HAT-P-9, HAT-P-32 & HAT-P-36 (Wang+, 2019)
J/ApJ/888/L5 : Transits, occultation times and RVs of WASP-12b (Yee+, 2020)
J/A+A/649/A6 : Gaia Catalog of Nearby Stars - GCNS (Gaia collaboration, 2021)
J/AJ/163/227 : HIRES RVel follow up for Kepler-1656 (Angelo+, 2022)
J/ApJS/262/21 : 3-D selection of 167 sub-stellar companions (Feng+, 2022)
J/AJ/165/125 : Planetary Orbit Eccentricity Trends (POET). I. (An+, 2023)
J/A+A/670/A68 : Architecture of exoplanetary systems (Mishra+, 2023)
http://exoplanetarchive.ipac.caltech.edu/ : NASA Exoplanet archive homepage
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Planet name
15- 26 F12.8 d Per [2.38/142.23] Period (1)
28- 34 F7.5 --- e [0.015/0.93] Eccentricity (1)
36- 42 F7.5 --- e_e [0.00012/0.22] Uncertainty in e (1)
44- 50 F7.5 Mjup Mp [0.0065/0.17] Planet mass (1)
52- 52 I1 --- Np [1/6] Number of other planets in system (1)
54- 78 A25 --- Method Discovery method (1)
80- 87 F8.6 mag BP-RP [0.71/1.99] Gaia BP-RP color
89-106 F18.16 mag GMag [3/8.25] Absolute Gaia G-band magnitude
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Note (1): From the NASA Exoplanet Archive Planetary Systems Composite Parameters
table (doi:10.26133/NEA13) last retrieved 2023-08-28.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name Planet name
21- 32 F12.8 d Per [1/194.3] Period (1)
34- 40 F7.5 --- e [0.01/0.93] Eccentricity (1)
42- 48 A7 --- e_e Uncertainty in e (1)
50- 56 F7.5 Mjup Mp [0.17/9.84] Planet mass (1)
58- 58 I1 --- Np [1/4] Number of other planets in system (1)
60- 66 A7 --- Method Discovery method (1)
68- 75 F8.6 mag BP-RP [0.7/1.86] Gaia BP-RP color
77- 94 F18.16 mag GMag [2.6/7.9] Absolute Gaia G-band magnitude
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Note (1): From the NASA Exoplanet Archive Planetary Systems Composite Parameters
table (doi:10.26133/NEA13) last retrieved 2023-08-28.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 09-Dec-2024