TY - JOUR
T1 - NEID Reveals That the Young Warm Neptune TOI-2076 b Has a Low Obliquity
AU - Frazier, Robert C.
AU - Stefánsson, Gudmundur
AU - Mahadevan, Suvrath
AU - Yee, Samuel W.
AU - Cañas, Caleb I.
AU - Winn, Joshua N.
AU - Luhn, Jacob
AU - Dai, Fei
AU - Doyle, Lauren
AU - Cegla, Heather
AU - Kanodia, Shubham
AU - Robertson, Paul
AU - Wisniewski, John
AU - Bender, Chad F.
AU - Dong, Jiayin
AU - Gupta, Arvind F.
AU - Halverson, Samuel
AU - Hawley, Suzanne
AU - Hebb, Leslie
AU - Holcomb, Rae
AU - Kowalski, Adam
AU - Libby-Roberts, Jessica
AU - Lin, Andrea S.J.
AU - McElwain, Michael W.
AU - Ninan, Joe P.
AU - Petrovich, Cristobal
AU - Roy, Arpita
AU - Schwab, Christian
AU - Terrien, Ryan C.
AU - Wright, Jason T.
N1 - Publisher Copyright:
© 2023. The Author(s). Published by the American Astronomical Society.
PY - 2023/2/1
Y1 - 2023/2/1
N2 - TOI-2076 b is a sub-Neptune-sized planet (R = 2.39 ± 0.10 R ⊕) that transits a young (204 ± 50 MYr) bright (V = 9.2) K-dwarf hosting a system of three transiting planets. Using spectroscopic observations obtained with the NEID spectrograph on the WIYN 3.5 m Telescope, we model the Rossiter-McLaughlin effect of TOI-2076 b, and derive a sky-projected obliquity of λ = − 3 − 15 + 16 ° . Using the size of the star (R = 0.775 ± 0.015 R ⊙), and the stellar rotation period (P rot = 7.27 ± 0.23 days), we estimate an obliquity of ψ = 18 − 9 + 10 ° (ψ < 34° at 95% confidence), demonstrating that TOI-2076 b is in a well-aligned orbit. Simultaneous diffuser-assisted photometry from the 3.5 m telescope at Apache Point Observatory rules out flares during the transit. TOI-2076 b joins a small but growing sample of young planets in compact multi-planet systems with well-aligned orbits, and is the fourth planet with an age ≲300 Myr in a multi-transiting system with an obliquity measurement. The low obliquity of TOI-2076 b and the presence of transit timing variations in the system suggest the TOI-2076 system likely formed via convergent disk migration in an initially well-aligned disk.
AB - TOI-2076 b is a sub-Neptune-sized planet (R = 2.39 ± 0.10 R ⊕) that transits a young (204 ± 50 MYr) bright (V = 9.2) K-dwarf hosting a system of three transiting planets. Using spectroscopic observations obtained with the NEID spectrograph on the WIYN 3.5 m Telescope, we model the Rossiter-McLaughlin effect of TOI-2076 b, and derive a sky-projected obliquity of λ = − 3 − 15 + 16 ° . Using the size of the star (R = 0.775 ± 0.015 R ⊙), and the stellar rotation period (P rot = 7.27 ± 0.23 days), we estimate an obliquity of ψ = 18 − 9 + 10 ° (ψ < 34° at 95% confidence), demonstrating that TOI-2076 b is in a well-aligned orbit. Simultaneous diffuser-assisted photometry from the 3.5 m telescope at Apache Point Observatory rules out flares during the transit. TOI-2076 b joins a small but growing sample of young planets in compact multi-planet systems with well-aligned orbits, and is the fourth planet with an age ≲300 Myr in a multi-transiting system with an obliquity measurement. The low obliquity of TOI-2076 b and the presence of transit timing variations in the system suggest the TOI-2076 system likely formed via convergent disk migration in an initially well-aligned disk.
UR - https://www.scopus.com/pages/publications/85148770503
UR - https://www.scopus.com/pages/publications/85148770503#tab=citedBy
U2 - 10.3847/2041-8213/acba18
DO - 10.3847/2041-8213/acba18
M3 - Article
AN - SCOPUS:85148770503
SN - 2041-8205
VL - 944
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 2
M1 - L41
ER -