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- W4384343874 abstract "We carry out detailed spectral and timing analyses of the $Chandra$ X-ray data of HD 179949, a prototypical example of a star with a close-in giant planet with possible star-planet interaction (SPI) effects. We find a low coronal abundance $A({rm Fe})/A({rm H}){approx}0.2$ relative to the solar photospheric baseline of Anders & Grevesse (1989), and significantly lower than the stellar photosphere as well. We further find low abundances of high First Ionization Potential (FIP) elements $A({rm O})/A({rm Fe}){lesssim}1$, $A({rm Ne})/A({rm Fe}){lesssim}0.1$, but with indications of higher abundances of $A({rm N})/A({rm Fe}){gg}1, A({rm Al})/A({rm Fe}){lesssim}10$. We estimate a FIP bias for this star in the range $approx{-0.3}$ to ${-0.1}$, larger than the ${lesssim}-$0.5 expected for stars of this type, but similar to stars hosting close-in hot Jupiters. We detect significant intensity variability over time scales ranging from 100 s - 10 ks, and also evidence for spectral variability over time scales of 1-10 ks. We combine the $Chandra$ flux measurements with $Swift$ and XMM-$Newton$ measurements to detect periodicities and determine that the dominant signal is tied to the stellar polar rotational period, consistent with expectations that the corona is rotational-pole dominated. We also find evidence for periodicity at both the planetary orbital frequency and at its beat frequency with the stellar polar rotational period, suggesting the presence of a magnetic connection between the planet and the stellar pole. If these periodicities represent an SPI signal, it is likely driven by a quasi-continuous form of heating (e.g., magnetic field stretching) rather than sporadic, hot, impulsive flare-like reconnections." @default.
- W4384343874 created "2023-07-15" @default.
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- W4384343874 date "2023-07-01" @default.
- W4384343874 modified "2023-10-14" @default.
- W4384343874 title "X-Ray Activity Variations and Coronal Abundances of the Star–Planet Interaction Candidate HD 179949" @default.
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- W4384343874 doi "https://doi.org/10.3847/1538-4357/acd054" @default.
- W4384343874 hasPublicationYear "2023" @default.
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