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

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dc.contributor.authorGalarza J.Y.
dc.contributor.authorFerreira T.
dc.contributor.authorLorenzo-Oliveira D.
dc.contributor.authorSimon J.D.
dc.contributor.authorReggiani H.
dc.contributor.authorPiro A.L.
dc.contributor.authorButler R.P.
dc.contributor.authorNetto Y.
dc.contributor.authorValio A.
dc.contributor.authorCiardi D.R.
dc.contributor.authorSafonov B.
dc.date.accessioned2024-09-01T06:14:31Z
dc.date.available2024-09-01T06:14:31Z
dc.date.issued2024
dc.description.abstract© 2024. The Author(s). Published by the American Astronomical Society.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 ( ρ = 0.195 − 0.017 + 0.018 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.
dc.description.issuenumber2
dc.description.volume168
dc.identifier.doi10.3847/1538-3881/ad53bf
dc.identifier.issnNone
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/39251
dc.relation.ispartofAstronomical Journal
dc.rightsAcesso Aberto
dc.titleTOI-1173 A b: The First Inflated Super-Neptune in a Wide Binary System
dc.typeArtigo
local.scopus.citations1
local.scopus.eid2-s2.0-85199701739
local.scopus.updated2025-04-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85199701739&origin=inward
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