The DEdicated MONitor of EXotransits (DEMONEX): Seven Transits of XO-4b
S. Villanueva Jr., J. D. Eastman, and B. S. Gaudi

TL;DR
This paper presents new transit observations of XO-4b using the DEMONEX telescope, refining system parameters, analyzing data detrending effects, and assessing models for stellar and planetary characteristics.
Contribution
It provides new transit data for XO-4b, evaluates the impact of data detrending and modeling choices, and refines the system parameters and spin-orbit alignment.
Findings
Detrending against CCD position and airmass affects parameter estimates.
Systematic uncertainties in radius ratio can be three times larger than statistical errors.
Choice of Rossiter-McLaughlin model significantly influences inferred stellar spin parameters.
Abstract
The DEdicated MONitor of EXotransits (DEMONEX) was a 20 inch robotic and automated telescope to monitor bright stars hosting transiting exoplanets to discover new planets and improve constraints on the properties of known transiting planetary systems. We present results for the misaligned hot Jupiter XO-4b containing 7 new transits from the DEMONEX telescope, including 3 full and 4 partial transits. We combine these data with archival light curves and archival radial velocity measurements to derive the host star mass and radius as well as the planet mass and radius and a refined ephemeris of days and . We include archival Rossiter-McLaughlin measurements…
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