J/MNRAS/414/1278 Eccentricities of transiting planets (Pont+, 2011)
Determining eccentricities of transiting planets:
a divide in the mass-period plane.
Pont F., Husnoo N., Mazeh T., Fabrycky D.
<Mon. Not. R. Astron. Soc., 414, 1278-1284 (2011)>
=2011MNRAS.414.1278P 2011MNRAS.414.1278P
ADC_Keywords: Stars, double and multiple ; Planets ; Binaries, orbits
Keywords: planetary systems
Abstract:
The two dominant features in the distribution of orbital parameters
for close-in exoplanets are the prevalence of circular orbits for very
short periods, and the observation that planets on closer orbits tend
to be heavier. The first feature is interpreted as a signature of
tidal evolution, while the origin of the second, a 'mass-period
relation' for hot Jupiters, is not understood. In this paper we
reconsider the ensemble properties of transiting exoplanets with
well-measured parameters, focusing on orbital eccentricity and the
mass-period relation. We recalculate the constraints on eccentricity
in a homogeneous way, using new radial velocity data, with particular
attention to statistical biases. We find that planets on circular
orbits gather in a well-defined region of the mass-period plane,
close to the minimum period for any given mass. Exceptions to this
pattern reported in the literature can be attributed to statistical
biases. The ensemble data is compatible with classical tide theory
with orbital circularization caused by tides raised on the planet, and
suggest that tidal circularization and the stopping mechanisms for
close-in planets are closely related to each other. The position
mass-period relation is compatible with a relation between a
planet's Hill radius and its present orbit.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 95 64 *Eccentricity of transiting planets
tables.dat 35 44 Radial velocity data for WASP-2, WASP-4, WASP-5
and WASP-7 (tables S1-S4 of the paper)
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Note on table1.dat: The list includes planets with well-determined
parameters as of 2010 July. An up-to-date list of parameters is kept
on http://www.inscience.ch/transits.
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See also:
http://www.inscience.ch/transits : Parameters for transiting exoplanets
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name of planet
10 A1 --- --- [/]
11- 18 A8 --- OName Other name of planet
20- 25 F6.3 jovMass Mass Mass, in Jovian mass
27- 31 F5.3 jovMass E_Mass Error on Mass (upper value), in Jovian mass
33- 37 F5.3 jovMass e_Mass Error on Mass (lower value), in Jovian mass
39- 45 F7.3 d Per Orbital period
47 A1 --- l_Ecc Limit flag on Ecc
48- 52 F5.3 --- Ecc Eccentricity (this study)
54- 58 F5.3 --- E_Ecc ? Error on Ecc (upper value)
60- 64 F5.3 --- e_Ecc ? Error on Ecc (lower value)
65 A1 --- n_Ecc [*] adopted value (1)
67 A1 --- l_Ecc2 Limit flag on Ecc2
68- 74 F7.5 --- Ecc2 Eccentricity (literature)
76- 82 F7.5 --- E_Ecc2 ? Error on Ecc2 (upper value) (2)
84- 90 F7.5 --- e_Ecc2 ? Error on Ecc2 (lower value) (2)
91- 95 A5 --- n_Ecc2 Adopted confidence limit (2)
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Note (1): Asterisks mark values that we adopted from the literature without
re-analysis.
Note (2): When a circular orbit is compatible with the data according to
our analysis, we give the upper 95 per cent confidence limit.
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Byte-by-byte Description of file: tables.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [WASP-]
6 I1 --- WASP WASP identification number
8- 20 F13.5 d BJD Baricentric Julian Date
22- 30 F9.5 km/s RV Radial velocity
32- 35 F4.2 km/s e_RV rms uncertainty on RV
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 02-Feb-2012