J/A+A/574/A39 Exoplanetary systems fundamental parameters (Damiani+, 2015)
Evolution of angular-momentum-losing exoplanetary systems.
Revisiting Darwin stability.
Damiani C., Lanza A.F.
<Astron. Astrophys., 574, A39-39 (2015)>
=2015A&A...574A..39D 2015A&A...574A..39D
ADC_Keywords: Stars, double and multiple ; Binaries, orbits
Keywords: planets and satellites: dynamical evolution and stability -
planet-star interactions - stars: late-type - methods: analytical
Abstract:
We assess the importance of tidal evolution and its interplay with
magnetic braking in the population of hot-Jupiter planetary systems.
By minimizing the total mechanical energy of a given system under the
constraint of stellar angular momentum loss, we rigorously find the
conditions for the existence of dynamical equilibrium states. We
estimate their duration, in particular when the wind torque spinning
down the star is almost compensated for by the tidal torque spinning
it up. We introduce dimensionless variables to characterize the tidal
evolution of observed hot Jupiter systems and discuss their spin and
orbital states using generalized Darwin diagrams based on our new
approach. We show that their orbital properties are related to the
effective temperature of their host stars. The long-term evolution of
planets orbiting F- and G-type stars is significantly different owing
to the combined effect of magnetic braking and tidal dissipation. The
existence of a quasi-stationary state, in the case of short-period
planets, can significantly delay their tidal evolution that would
otherwise bring the planet to fall into its host star. Most of the
planets known to orbit F-type stars are presently found to be near
this stationary state, probably in a configuration not too far from
what they had when their host star settled on the zero-age main
sequence. Considering the importance of angular momentum loss in the
early stages of stellar evolution, our results indicate that it has to
be considered to properly test the migration scenarios of planetary
system formation.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 140 109 Main stellar and planetary parameters of the
systems considered in Sect. 4
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Star name
13- 18 F6.4 d Porb [0.7/9.5] Orbital period of the planet
(error typically smaller than 10-5d)
20- 24 F5.3 AU a [0.01/0.09] Semi-major axis of the orbit
(error typically smaller than 10-3AU)
26- 30 F5.3 --- e [0/0.1] Eccentricity of the orbit
32- 36 F5.3 --- E_e [0/0.1]? Error on Eccentricity (upper value)
38- 41 F4.2 --- e_e [0/0.1]? Error on Eccentricity (lower value)
43- 47 F5.2 Mjup Mp [0.02/11] Planet mass (in Jupiter mass)
49- 52 F4.2 Mjup E_Mp [0/1.6] Error on Mp (upper value)
54- 57 F4.2 Mjup e_Mp [0/1.6] Error on M (lower value)
59- 62 F4.2 Rjup Rp [0.2/1.8] Planet radius (in Jupiter radius)
64- 67 F4.2 Rjup E_Rp [0/1] Error on Rp (upper value)
69- 72 F4.2 Rjup e_Rp [0/1] Error on Rp (lower value)
74- 77 F4.2 Msun M* [0.6/1.6] Star mass
79- 82 F4.2 Msun E_M* [0.01/0.2] Error on M* (upper value)
84- 87 F4.2 Msun e_M* [0.01/0.2] Error on M* (lower value)
89- 92 F4.2 Rsun R* [0.6/2.3] Star radius
94- 97 F4.2 Rsun E_R* [0.01/0.2] Error on R* (upper value)
99-102 F4.2 Rsun e_R* [0.01/0.2] Error on R* (lower value)
104-107 I4 K Teff Effective temperature
109-111 I3 K e_Teff rms uncertainty on Teff
113-116 F4.1 km/s vsini [0.2/40] Rotational velocity
118-120 F3.1 km/s E_vsini [0/5] Error on vsini (upper value)
122-124 F3.1 km/s e_vsini [0/5] Error on vsini (lower value)
126-130 F5.1 deg lambda ?=- Projected obliquity λ (angle between
the stellar spin axis and the orbital pole)
132-135 F4.1 deg E_lambda ? Error on lambda (upper value)
137-140 F4.1 deg e_lambda ? Error on lambda (lower value)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 09-Mar-2015