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The Outer Orbital Architectures of Young Transiting Planet Systems

Presentation #620.04 in the session Planets around Young Stars.

Published onApr 03, 2024
The Outer Orbital Architectures of Young Transiting Planet Systems

Young planetary systems provide crucial insight into their formation and evolutionary processes. Mapping full system architectures across age constrains dynamical history and can distinguish the driving mechanisms and timescales of planet migration. While dozens of short period young exoplanets have been found with K2 and TESS, long-term precision RV monitoring is needed to search for outer planets. We present a precision RV survey of 16 young (20 Myr to 1 Gyr) transiting planet host stars to search for outer giant planets using the Habitable-zone Planet Finder on the 10-m HET. The median target has a time series spanning 5 years. HPF is particularly useful because of its NIR bandpass where stellar activity-driven RV noise should be minimized. We present limits on the occurrence rate of outer giant planets in the sample and highlight candidate orbital signals, including long-term accelerations possibly from brown dwarf companions. We rule out the presence of stellar companions throughout these systems’ lives because they should not be stripped by these ages. Thus, the planetary architecture dictates the dynamical history of the system. We also present a new telluric correction for HPF utilizing a map of its variable line spread function. Contamination from telluric absorption is significant in the NIR, which reduces the amount of spectral information usable for precision RV measurements. With an accurate representation of the HPF LSF, we greatly improve the accuracy of the telluric correction and show the improvement in RVs from including a greater spectral grasp.

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