Browsing by Author "Luhn, Jacob"

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    NEID Reveals That the Young Warm Neptune TOI-2076 b Has a Low Obliquity
    (2023) Frazier, Robert C.; Stefansson, Gudmundur; Mahadevan, Suvrath; Yee, Samuel W.; Canas, Caleb I.; Winn, Joshua N.; Luhn, Jacob; Dai, Fei; Doyle, Lauren; Cegla, Heather; Kanodia, Shubham; Robertson, Paul; Wisniewski, John; Bender, Chad F.; Dong, Jiayin; Gupta, Arvind F.; Halverson, Samuel; Hawley, Suzanne; Hebb, Leslie; Holcomb, Rae; Kowalski, Adam; Libby-Roberts, Jessica; Lin, Andrea S. J.; McElwain, Michael W.; Ninan, Joe P.; Petrovich, Cristobal; Roy, Arpita; Schwab, Christian; Terrien, Ryan C.; Wright, Jason T.
    TOI-2076 b is a sub-Neptune-sized planet (R = 2.39 + 0.10 R-circle plus) 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 lambda = - 3 (-15) (+16) . Using the size of the star (R = 0.775 + 0.015 R-?), and the stellar 16 rotation period (P-rot = 7.27 + 0.23 days), we estimate an obliquity of y =18(-9) (+10) (psi < 34 degrees at 95% confidence), 10 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.