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TOI-4468 and the Emerging Trends in Systems Hosting Hot Jupiters with Nearby Companion Planets

Presentation #611.03 in the session Hot Jupiters and Ultra-Short Periods.

Published onApr 03, 2024
TOI-4468 and the Emerging Trends in Systems Hosting Hot Jupiters with Nearby Companion Planets

Almost all hot Jupiters lack nearby transiting companion planets within 2-3 times their orbital period, suggesting the dominance of a dynamically active formation pathway. A growing subpopulation of ~10 recently discovered systems containing hot Jupiters with nearby planets has shown that this is not always the case and trends have started to emerge within this smaller subsample, such as a preference for companion planets to be on orbits interior to the hot Jupiter. Unpacking the origins of these trends has the potential to yield insights into the processes that not only drive the formation of this unique subpopulation, but the contribution of different formation mechanisms to the hot Jupiter population as a whole. We discuss these emerging trends, their potential implications, and place them in the context of the wider hot Jupiter population. Furthermore, we report the discovery of the TOI-4468 system, a K dwarf host to an inner hot Jupiter with an orbital period of 2.77 d and a radius of 11.43 ± 0.58 REarth as well as an outer sub-Neptune with an orbital period of 7.01 d and a radius of 3.22 ± 0.26 REarth. Both planets are statistically validated as supported by ground-based photometry. TOI-4468 b is only the second instance of a hot Jupiter with a nearby outer companion and the only hot Jupiter in this category without an inner companion, making it an outlier even among this peculiar subpopulation. We discuss how this system nuances our theories on the formation of this subpopulation, the emerging trends observed, and the shortcomings of existing models.

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