J/A+A/615/A39 Exoplanets interior structures & Love numbers (Kellermann+, 2018)
Interior structure models and fluid Love numbers of exoplanets in the
super-Earth regime.
Kellermann C., Becker A., Redmer R.
<Astron. Astrophys. 615, A39 (2018)>
=2018A&A...615A..39K 2018A&A...615A..39K (SIMBAD/NED BibCode)
ADC_Keywords: Exoplanets ; Planets ; Models
Keywords: equation of state - planets and satellites: terrestrial planets -
planets and satellites: composition -
planets and satellites: individual: K2-3 system -
planets and satellites: interiors - planet-star interactions -
Abstract:
Space missions such as CoRoT and Kepler have made the transit method
the most successful technique in observing extrasolar planets.
However, although the mean density of a planet can be derived from its
measured mass and radius, no details about its interior structure,
such as the density profile, can be inferred so far. If determined
precisely enough, the shape of the transiting light curve might, in
principle, reveal the shape of the planet, and in particular, its
deviation from spherical symmetry. These deformations are caused, for
instance, by the tidal interactions of the planet with the host star
and by other planets that might orbit in the planetary system. The
deformations depend on the interior structure of the planet and its
composition and can be parameterized as Love numbers kn. This means
that the diversity of possible interior models for extrasolar planets
might be confined by measuring this quantity. We present results of a
wide-ranging parameter study in planet mass, surface temperature, and
layer mass fractions on such models for super-Earths and their
corresponding Love numbers. Based on these data, we find that k2 is
most useful in assessing the ratio of rocky material to iron and in
ruling out certain compositional configurations for measured mass and
radius values, such as a prominent core consisting of rocky material.
Furthermore, we apply the procedure to exoplanets K2-3b and c and
predict that K2-3c probably has a thick outer water layer.
Description:
The files contain the example parameter study for an iron core,
magnesium oxide lower mantle and an outer core of H/He mixture, as
well as all iso-radius lines shown. In the first file, entries with
"0.0" for radius and k2 mark either models that did not converge
(especially for high mass fractions of the volatile layer) or
combinations of mass fractions that would add up to be greater than
unity. These entries were kept in the file to ensure a rectangular
data grid.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
f1.dat 80 24300 Fig1: (Fe MgO (H2/He)☉, 3MEarth, 500K)
f3_1000k.dat 40 356 Fig3: (Fe MgO (H2/He)☉, 3MEarth, 2REarth)
f3_3me.dat 40 389 Fig3: (Fe MgO (H2/He)☉, 1000K, 2REarth)
f4_11.dat 40 1956 Fig4: (Fe MgO (H2/He)☉, 3MEarth, 300K)
f4_12.dat 40 1470 Fig4: (Fe MgO (H2/He)☉, 3MEarth, 2500K)
f4_21.dat 40 1631 Fig4: (Fe MgO (H2/He)☉, 1MEarth, 1000K)
f4_22.dat 40 1397 Fig4: (Fe MgO (H2/He)☉, 10MEarth, 1000K)
f5_11.dat 40 300 Fig5: (3MEarth, 300K, 2REarth)
f5_12.dat 40 431 Fig5: (3MEarth, 2500K, 2REarth)
f5_21.dat 40 416 Fig5: (1MEarth, 1000K, 2REarth)
f5_22.dat 40 479 Fig5: (10MEarth, 1000K, 2REarth)
k23bc1.dat 40 221 Fig6: (Fe MgO (H2/He)☉, 8.4MEarth, 463K)
k23bc2.dat 40 359 Fig6: (Fe MgO H2O, 8.4MEarth, 463K)
k23bc3.dat 40 118 Fig6: (Fe H2O (H2/He)☉, 8.4MEarth, 463K)
k23bc4.dat 40 17 Fig6: (MgO H2O (H2/He)☉, 8.4MEarth, 463K)
k23cc1.dat 40 198 Fig6: (Fe MgO (H2/He)☉, 2.1MEarth, 344K)
k23cc2.dat 40 250 Fig6: (Fe MgO H2O, 2.1MEarth, 344K)
k23cc3.dat 40 126 Fig6: (Fe H2O (H2/He)☉, 2.1MEarth, 344K)
k23cc4.dat 40 124 Fig6: (MgO H2O (H2/He)☉, 2.1MEarth, 344K)
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See also:
J/A+A/482/989 : Spectropolarimetric model for Earth-like planets (Stam, 2008)
Byte-by-byte Description of file: f1.dat
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Bytes Format Units Label Explanations
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9- 20 E12.7 --- M3 Mass fraction of the outermost layer
29- 40 E12.7 --- M2 Mass fraction of the second layer
49- 60 E12.7 Earth Rad Radius in earth radii
69- 80 E12.7 --- k2 Love number
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Byte-by-byte Description of file: f[345]*.dat k23*.dat
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Bytes Format Units Label Explanations
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9- 20 E12.3 --- M3 Mass fraction of the outermost layer
29- 40 E12.3 --- k2 Love number
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Acknowledgements:
Clemens Kellermann, clemens.kellermann(at)uni-rostock.de
(End) Clemens Kellermann [Univ. of Rostock], Patricia Vannier [CDS] 12-Feb-2018