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• W4311553555 abstract "TOI-2076 b is a sub-Neptune-sized planet ($R=2.39 pm 0.10 mathrm{R_oplus}$) that transits a young ($204 pm 50 mathrm{MYr}$) bright ($V = 9.2$) K-dwarf hosting a system of three transiting planets. Using spectroscopic observations 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 $lambda=-3_{-15}^{+16:circ}$. Using the size of the star ($R=0.775 pm0.015 mathrm{R_odot}$), and the stellar rotation period ($P_{mathrm{rot}}=7.27pm0.23$ days), we estimate a true obliquity of $psi=18_{-9}^{+10:circ}$ ($psi < 34^circ$ at 95% confidence), demonstrating that TOI-2076 b is on 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 $lesssim 300$ 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." @default.
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• W4311553555 date "2022-12-12" @default.
• W4311553555 modified "2023-10-16" @default.
• W4311553555 title "NEID Reveals that The Young Warm Neptune TOI-2076 b Has a Low Obliquity" @default.
• W4311553555 doi "https://doi.org/10.48550/arxiv.2212.06266" @default.
• W4311553555 hasPublicationYear "2022" @default.
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