HD 183579b: A Warm Sub-Neptune Transiting a Solar Twin Detected by TESS

Kavli Affiliate: Edward H. Morgan

| First 5 Authors: Tianjun Gan, Megan Bedell, Sharon Xuesong Wang, Daniel Foreman-Mackey, Jorge Meléndez

| Summary:

We report the discovery and characterization of a transiting warm sub-Neptune
planet around the nearby bright ($V=8.75$ mag, $K=7.15$ mag) solar twin HD
183579, delivered by the Transiting Exoplanet Survey Satellite (TESS). The host
star is located $56.8pm0.1$ pc away with a radius of $R_{ast}=0.97pm0.02
R_{odot}$ and a mass of $M_{ast}=1.03pm0.05 M_{odot}$. We confirm the
planetary nature by combining space and ground-based photometry, spectroscopy,
and imaging. We find that HD 183579b (TOI-1055b) has a radius of
$R_{p}=3.53pm0.13 R_{oplus}$ on a $17.47$ day orbit with a mass of
$M_{p}=11.2pm5.4 M_{oplus}$ ($3sigma$ mass upper limit of $27.4
M_{oplus}$). HD 183579b is the fifth brightest known sub-Neptune planet system
in the sky, making it an excellent target for future studies of the interior
structure and atmospheric properties. By performing a line-by-line differential
analysis using the high resolution and signal-to-noise ratio HARPS spectra, we
find that HD 183579 joins the typical solar twin sample, without a
statistically significant refractory element depletion.

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