2020A&A...639A..66M


Query : 2020A&A...639A..66M

2020A&A...639A..66M - Astronomy and Astrophysics, volume 639A, 66-66 (2020/7-1)

Planetary mass-radius relations across the galaxy.

MICHEL A., HALDEMANN J., MORDASINI C. and ALIBERT Y.

Abstract (from CDS):


Context. Planet formation theory suggests that planet bulk compositions are likely to reflect the chemical abundance ratios of their host star's photosphere. Variations in the abundance of particular chemical species in stellar photospheres between different galactic stellar populations demonstrate that there are differences among the expected solid planet bulk compositions.
Aims. We aim to present planetary mass-radius relations of solid planets for kinematically differentiated stellar populations, namely, the thin disc, thick disc, and halo.
Methods. Using two separate internal structure models, we generated synthetic planets using bulk composition inputs derived from stellar abundances. We explored two scenarios, specifically iron-silicate planets at 0.1AU and silicate-iron-water planets at 4AU.
Results. We show that there is a persistent statistical difference in the expected mass-radius relations of solid planets among the different galactic stellar populations. At 0.1AU for silicate-iron planets, there is a 1.51-2.04% mean planetary radius difference between the thick and thin disc stellar populations, whilst for silicate-iron-water planets past the ice line at 4AU, we calculate a 2.93-3.26% difference depending on the models. Between the halo and thick disc, we retrieve at 0.1AU a 0.53-0.69% mean planetary radius difference, and at 4AU we find a 1.24-1.49% difference depending on the model.
Conclusions. Future telescopes (such as PLATO) will be able to precisely characterize solid exoplanets and demonstrate the possible existence of planetary mass-radius relationship variability between galactic stellar populations.

Abstract Copyright: © ESO 2020

Journal keyword(s): planets and satellites: composition - planets and satellites: interiors - stars: abundances - planetary systems

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 K2-106b Pl 00 52 19.1416171671 +10 47 40.903737832           ~ 38 0
2 CoRoT-7 * 06 43 49.4690164104 -01 03 46.826642700   12.78 11.73 11.36 10.87 K0V 189 1
3 BD-05 3504b Pl 12 27 29.5848289637 -06 43 18.766035130           ~ 30 0
4 Kepler-10 Ro* 19 02 43.0613892904 +50 14 28.701617339       11.00   G2V 184 1
5 BD+41 3306 PM* 19 19 00.5489000285 +41 38 04.582441681 10.01 9.67 8.86 8.18 7.66 K0V 253 0
6 BD+38 3583 Ro* 19 25 40.3885404552 +38 40 20.413186860   10.73 10.00     G5V 92 0

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2022.08.09-04:30:58

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