TY - JOUR
T1 - Trials and Tribulations in the Reanalysis of KELT-24 b
T2 - A Case Study for the Importance of Stellar Modeling
AU - Giovinazzi, Mark R.
AU - Cale, Bryson
AU - Eastman, Jason D.
AU - Rodriguez, Joseph E.
AU - Blake, Cullen H.
AU - Stassun, Keivan G.
AU - Vanderburg, Andrew
AU - Kunimoto, Michelle
AU - Kraus, Adam L.
AU - Twicken, Joseph
AU - Beatty, Thomas G.
AU - Dedrick, Cayla M.
AU - Horner, Jonathan
AU - Johnson, John A.
AU - Johnson, Samson A.
AU - McCrady, Nate
AU - Plavchan, Peter
AU - Sliski, David H.
AU - Wilson, Maurice L.
AU - Wittenmyer, Robert A.
AU - Wright, Jason T.
AU - Johnson, Marshall C.
AU - Rose, Mark E.
AU - Cornachione, Matthew
N1 - Publisher Copyright:
© 2024. The Author(s). Published by the American Astronomical Society.
PY - 2024/9/1
Y1 - 2024/9/1
N2 - We present a new analysis of the KELT-24 system, comprising a well-aligned hot Jupiter, KELT-24 b, and a bright (V = 8.3), nearby (d = 96.9 pc) F-type host star. KELT-24 b was independently discovered by two groups in 2019, with each reporting best-fit stellar parameters that were notably inconsistent. Here, we present three independent analyses of the KELT-24 system, each incorporating a broad range of photometric and spectroscopic data, including eight sectors of Transiting Exoplanet Survey Satellite (TESS) photometry and more than 200 new radial velocities (RVs) from the MINiature Exoplanet Radial Velocity Array. Two of these analyses use KELT-24's observed spectral energy distribution (SED) through a direct comparison to stellar evolutionary models, while our third analysis assumes an unknown additional body contributing to the observed broadband photometry and excludes the SED. Ultimately, we find that the models that include the SED are a poor fit to the available data, so we adopt the system parameters derived without it. We also highlight a single transit-like event observed by TESS, deemed likely to be an eclipsing binary bound to KELT-24, that will require follow-up observations to confirm. We discuss the potential of these additional bodies in the KELT-24 system as a possible explanation for the discrepancies between the results of the different modeling approaches, and explore the system for longer-period planets that may be weakly evident in the RV observations. The comprehensive investigations that we present not only increase the fidelity of our understanding of the KELT-24 system but also serve as a blueprint for future stellar modeling in global analyses of exoplanet systems.
AB - We present a new analysis of the KELT-24 system, comprising a well-aligned hot Jupiter, KELT-24 b, and a bright (V = 8.3), nearby (d = 96.9 pc) F-type host star. KELT-24 b was independently discovered by two groups in 2019, with each reporting best-fit stellar parameters that were notably inconsistent. Here, we present three independent analyses of the KELT-24 system, each incorporating a broad range of photometric and spectroscopic data, including eight sectors of Transiting Exoplanet Survey Satellite (TESS) photometry and more than 200 new radial velocities (RVs) from the MINiature Exoplanet Radial Velocity Array. Two of these analyses use KELT-24's observed spectral energy distribution (SED) through a direct comparison to stellar evolutionary models, while our third analysis assumes an unknown additional body contributing to the observed broadband photometry and excludes the SED. Ultimately, we find that the models that include the SED are a poor fit to the available data, so we adopt the system parameters derived without it. We also highlight a single transit-like event observed by TESS, deemed likely to be an eclipsing binary bound to KELT-24, that will require follow-up observations to confirm. We discuss the potential of these additional bodies in the KELT-24 system as a possible explanation for the discrepancies between the results of the different modeling approaches, and explore the system for longer-period planets that may be weakly evident in the RV observations. The comprehensive investigations that we present not only increase the fidelity of our understanding of the KELT-24 system but also serve as a blueprint for future stellar modeling in global analyses of exoplanet systems.
UR - http://www.scopus.com/inward/record.url?scp=85201320388&partnerID=8YFLogxK
U2 - 10.3847/1538-3881/ad55ec
DO - 10.3847/1538-3881/ad55ec
M3 - Article
AN - SCOPUS:85201320388
SN - 0004-6256
VL - 168
JO - Astronomical Journal
JF - Astronomical Journal
IS - 3
M1 - 118
ER -