Kavli Affiliate: Robert Goeke
| First 5 Authors: Yoshi Nike Emilia Eschen, Yoshi Nike Emilia Eschen, , ,
| Summary:
A crucial chemical link between stars and their orbiting exoplanets is
thought to exist. If universal, this connection could affect the formation and
evolution of all planets. Therefore, this potential vital link needs testing by
characterising exoplanets around chemically-diverse stars. We present the
discovery of two planets orbiting the metal-poor, kinematic thick-disk K-dwarf
TOI-2345. TOI-2345 b is a super-Earth with a period of 1.05 days and TOI-2345 c
is a sub-Neptune with a period of 21 days. In addition to the target being
observed in 4 TESS sectors, we obtained 5 CHEOPS visits and 26 radial
velocities from HARPS. By conducting a joint analysis of all the data, we find
TOI-2345 b to have a radius of $1.504substack+0.047\-0.044$ R$_oplus$ and
a mass of $3.49pm0.85$ M$_oplus$; and TOI-2345 c to have a radius of
$2.451substack+0.045\-0.046$ R$_oplus$ and a mass of
$7.27substack+2.27\-2.45$ M$_oplus$. To explore chemical links between
these planets and their host star, we model their interior structures newly
accounting for devolatised stellar abundances. TOI-2345 adds to the limited
sample of well characterised planetary systems around thick disk stars. This
system challenges theories of formation and populations of planets around thick
disk stars with its Ultra-Short Period super-Earth and the wide period
distribution of these two planets spanning the radius valley.
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