TOI-1173 A b: The First Inflated Super-Neptune in a Wide Binary System

Galarza, J.Y.; Ferreira, T.; Lorenzo-Oliveira, D.; Simon, J.D.; Reggiani, H.; Piro, A.L.; Butler, R.P.; Netto, Y.; Valio, A.; Ciardi, D.R.; Safonov, B.

Авторы: Galarza Jhon Yana, Ferreira Thiago, Lorenzo-Oliveira Diego, Simon Joshua D., Reggiani Henrique, Piro Anthony L., Butler R.Paul, Netto Yuri, Valio Adriana, Ciardi David R., Safonov Boris
Журнал: Astronomical Journal
Том: 168
Номер: 2
Год издания: 2024
Издательство: American Astronomical Society
Местоположение издательства: United States
Первая страница: 91
DOI: 10.3847/1538-3881/ad53bf
Аннотация: Among Neptunian mass exoplanets (20‑50 M ⊕), puffy hot Neptunes are extremely rare, and their unique combination of low mass and extended radii implies very low density (ρ < 0.3 g cm‑3). Over the last decade, only a few puffy planets have been detected and precisely characterized with both transit and radial velocity observations, most notably including WASP-107 b, TOI-1420 b, and WASP-193 b. In this paper, we report the discovery of TOI-1173 A b, a low-density ( g cm‑3) super-Neptune with P = 7.06 days in a nearly circular orbit around the primary G-dwarf star in the wide binary system TOI-1173 A/B. Using radial velocity observations with the MAROON-X and HIRES spectrographs and transit photometry from TESS, we determine a planet mass of M p = 27.4 ± 1.7 M ⊕ and radius of R p = 9.19 ± 0.18 R ⊕. TOI-1173 A b is the first puffy super-Neptune planet detected in a wide binary system (projected separation ∼11,400 au). We explore several mechanisms to understand the puffy nature of TOI-1173 A b and show that tidal heating is the most promising explanation. Furthermore, we demonstrate that TOI-1173 A b likely has maintained its orbital stability over time and may have undergone von-Zeipel–Lidov–Kozai migration followed by tidal circularization, given its present-day architecture, with important implications for planet migration theory and induced engulfment into the host star. Further investigation of the atmosphere of TOI-1173 A b will shed light on the origin of close-in low-density Neptunian planets in field and binary systems, while spin–orbit analyses may elucidate the dynamical evolution of the system.
Добавил в систему: Сафонов Борис Сергеевич

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TOI-1173 A b: The First Inflated Super-Neptune in a Wide Binary Systemстатья

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