Kavli Affiliate: Christopher J. Burke
| First 5 Authors: Matias I. Jones, Yared Reinarz, Rafael Brahm, Marcelo Tala Pinto, Jan Eberhardt
| Summary:
We report on the confirmation and follow-up characterization of two
long-period transiting substellar companions on low-eccentricity orbits around
TIC 4672985 and TOI-2529, whose transit events were detected by the TESS space
mission. Ground-based photometric and spectroscopic follow-up from different
facilities, confirmed the substellar nature of TIC 4672985 b, a massive gas
giant, in the transition between the super Jupiters and brown dwarfs mass
regime. From the joint analysis we derived the following orbital parameters: P
= 69.0480 d, Mp = 12.74 Mjup, Rp = 1.026 Rjup and e = 0.018. In addition, the
RV time series revealed a significant trend at the 350 m/s/yr level, which is
indicative of the presence of a massive outer companion in the system. TIC
4672985 b is a unique example of a transiting substellar companion with a mass
above the deuterium-burning limit, located beyond 0.1 AU and in a nearly
circular orbit. These planetary properties are difficult to reproduce from
canonical planet formation and evolution models. For TOI-2529 b, we obtained
the following orbital parameters: P = 64.5949 d, Mp = 2.340 Mjup, Rp = 1.030
Rjup and e = 0.021, making this object a new example of a growing population of
transiting warm giant planets.
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