학술논문
TOI-5126: A hot super-Neptune and warm Neptune pair discovered by $\textit{TESS}$ and $\textit{CHEOPS}$
Document Type
Working Paper
Author
Fairnington, Tyler R.; Nabbie, Emma; Huang, Chelsea X.; Zhou, George; Foo, Orion; Millholland, Sarah; Wright, Duncan; Belinski, Alexandre A.; Bieryla, Allyson; Ciardi, David R.; Collins, Karen A.; Collins, Kevin I.; Everett, Mark; Howell, Steve B.; Lissauer, Jack J.; Lund, Michael B.; Murgas, Felipe; Palle, Enric; Quinn, Samuel N.; Relles, Howard M.; Safonov, Boris S.; Schwarz, Richard P.; Scott, Nicholas J.; Srdoc, Gregor; Ricker, George; Vanderspek, Roland; Seager, Sara; Latham, David W.; Winn, Joshua W.; Jenkins, Jon M.; Bouma, Luke G.; Shporer, Avi; Ting, Eric B.; Dragomir, Diana; Kunimoto, Michelle; Eisner, Nora L.
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Subject
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Abstract
We present the confirmation of a hot super-Neptune with an exterior Neptune companion orbiting a bright (V = 10.1 mag) F-dwarf identified by the $\textit{Transiting Exoplanet Survey Satellite}$ ($\textit{TESS}$). The two planets, observed in sectors 45, 46 and 48 of the $\textit{TESS}$ extended mission, are $4.74^{+0.16}_{-0.14}$ $R_{\oplus}$ and $3.86^{+0.17}_{-0.16}$ $R_{\oplus}$ with $5.4588385^{+0.0000070}_{-0.0000072}$ d and $17.8999^{+0.0018}_{-0.0013}$ d orbital periods, respectively. We also obtained precise space based photometric follow-up of the system with ESAs $\textit{CHaracterising ExOplanets Satellite}$ ($\textit{CHEOPS}$) to constrain the radius and ephemeris of TOI-5126 b. TOI 5126 b is located in the "hot Neptune Desert" and is an ideal candidate for follow-up transmission spectroscopy due to its high predicted equilibrium temperature ($T_{eq} = 1442^{+46}_{-40}$ K) implying a cloud-free atmosphere. TOI-5126 c is a warm Neptune ($T_{eq}= 971^{+31}_{-27}$ K) also suitable for follow-up. Tentative transit timing variations (TTVs) have also been identified in analysis, suggesting the presence of at least one additional planet, however this signal may be caused by spot-crossing events, necessitating further precise photometric follow-up to confirm these signals.
Comment: Accepted in MNRAS, 18 pages, 14 figures
Comment: Accepted in MNRAS, 18 pages, 14 figures