Kavli Affiliate: Avi Shporer
| First 5 Authors: Xinyan Hua, Sharon Xuesong Wang, Johanna K. Teske, Tianjun Gan, Avi Shporer
| Summary:
We report the confirmation of a TESS-discovered transiting super-Earth planet
orbiting a mid-G star, HD 307842 (TOI-784). The planet has a period of 2.8
days, and the radial velocity (RV) measurements constrain the mass to be
9.67+0.83/-0.82 [Earth Masses]. We also report the discovery of an additional
planet candidate on an outer orbit that is most likely non-transiting. The
possible periods of the planet candidate are approximately 20 to 63 days, with
the corresponding RV semi-amplitudes expected to range from 3.2 to 5.4 m/s and
minimum masses from 12.6 to 31.1 [Earth Masses]. The radius of the transiting
planet (planet b) is 1.93+0.11/-0.09 [Earth Radii], which results in a mean
density of 7.4+1.4/-1.2 g/cm^3 suggesting that TOI-784b is likely to be a rocky
planet though it has a comparable radius to a sub-Neptune. We found TOI-784b is
located at the lower edge of the so-called “radius valley” in the radius vs.
insolation plane, which is consistent with the photoevaporation or core-powered
mass loss prediction. The TESS data did not reveal any significant transit
signal of the planet candidate, and our analysis shows that the orbital
inclinations of planet b and the planet candidate are 88.60+0.84/-0.86 degrees
and <= 88.3-89.2 degrees, respectively. More RV observations are needed to
determine the period and mass of the second object, and search for additional
planets in this system.
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