Kavli Affiliate: George Ricker
| First 5 Authors: Marcelo Tala Pinto, Andrés Jordán, Lorena Acuña, Matías Jones, Rafael Brahm
| Summary:
We report the discovery and characterization of three new transiting giant
planets orbiting TOI-6628, TOI-3837 and TOI-5027, and one new warm sub-Saturn
orbiting TOI-2328, whose transits events were detected in the lightcurves of
the Transiting Exoplanet Survey Satellite textbf{(TESS)} space mission. By
combining TESS lightcurves with ground-based photometric and spectroscopic
follow-up observations we confirm the planetary nature of the observed transits
and radial velocity variations. TOI-6628~$b$ has a mass of
0.75$pm$0.06~$M_mathrm{J}$, a radius of 0.98$pm$0.05~$R_J$ and is orbiting a
metal-rich star with a period of 18.18424$pm{0.00001}$ days and an
eccentricity of 0.667$pm0.016$, making it one of the most eccentric orbits of
all known warm giants. TOI-3837~$b$ has a mass of 0.59$pm$0.06~$M_mathrm{J}$,
a radius of 0.96$pm$0.05~$R_J$ and orbits its host star every
11.88865$pm$0.00003~days, with a moderate eccentricity of
0.198$^{+0.046}_{-0.058}$. With a mass of 2.01$pm$0.13~$M_mathrm{J}$ and a
radius of 0.99$^{+0.07}_{-0.12}$ $R_J$, TOI-5027~$b$ orbits its host star in an
eccentric orbit with $e$~=~0.395$^{+0.032}_{-0.029}$ every
10.24368$pm{0.00001}$~days. TOI-2328~$b$ is a Saturn-like planet with a mass
of 0.16$pm$0.02~$M_mathrm{J}$ and a radius of 0.89$pm$0.04~$R_J$, orbiting
its host star in a nearly circular orbit with $e$~=~0.057$^{+0.046}_{-0.029}$
at an orbital period of 17.10197$pm{0.00001}$ days.
All four planets have orbital periods above 10 days, and our planet interior
structure models are consistsent a rocky-icy core with a H/He envelope,
providing evidence supporting the core accretion model of planet formation for
this kind of planets.
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