Kavli Affiliate: Sara Seager
| First 5 Authors: Abderahmane Soubkiou, Abderahmane Soubkiou, , ,
| Summary:
We present the discovery and validation of a super-Earth planet orbiting the
M dwarf star TOI-1846 (TIC 198385543). The host star(Kmag = 9.6)is located 47
pc away and has a radius of Rs=0.41+/-0.01R_Sun,a mass of Ms=0.40+/-0.02M_Sun
and an effective temperature of Teff=3568+/-44K. Our analyses are based on
joint modelling of TESS photometry and ground-based multi-color photometric
data. We also use high-resolution imaging and archival images, as well as
statistical validation techniques to support the planetary system nature. We
find that TOI-1846b is a super-Earth sized planet with radius of
Rp=1.79+/-0.07R_Earth and a predicted mass of Mp=4.4+1.6-1.0M_Earth (from the
Chen & Kipping relation) on a 3.9 d orbit, with an equilibrium temperature of
Teq=589+/-20K (assuming a null Bond Albedo) and an incident flux of
Sp=17.6+/-2.0S_Earth. Based on the two RV measurements obtained with the TRES
spectrograph and high-resolution imaging, a non-planetary transiting companion
is excluded. With a radius of ~1.8R_Earth, TOI-1846b is within the sparsely
populated radius range around 2R_Earth known as the radius gap (or radius
valley). This discovery can contribute to refining the precise location of the
radius valley for small planets orbiting bright M dwarfs, thereby enhancing our
understanding of planetary formation and evolution processes.
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