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• W3099758081 endingPage "152" @default.
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• W3099758081 abstract "Using K2 data, we have identified 23 very low mass members of the $rho$ Oph and Upper Scorpius star-forming region as having periodic photometric variability not easily explained by well-established physical mechanisms such as star spots, eclipsing binaries, or pulsation. All of these unusual stars are mid-to-late M dwarfs without evidence of active accretion, and with photometric periods generally $<$1 day. Often the unusual light curve signature takes the form of narrow flux dips; when we also have rotation periods from star spots, the two periods agree, suggesting that the flux dips are due to material orbiting the star at the Keplerian co-rotation radius. We sometimes see state-changes in the phased light curve morphologies where $sim$25% of the waveform changes shape on timescales less than a day; often, the state-change takes place immediately after a strong flare. For the group of stars with these sudden light curve morphology shifts, we attribute their flux dips as most probably arising from eclipses of warm coronal gas clouds, analogous to the sling-shot prominences postulated to explain transient H$alpha$ absorption features in AB Doradus itself and other rapidly rotating late type stars. For another group of stars with somewhat longer periods, we find the short duration flux dips to be highly variable on both short and long timescales, with generally asymmetric flux dip profiles. We believe that these flux dips are due to particulate clouds possibly associated with a close-in planet or resulting from a recent collisional event." @default.
• W3099758081 created "2020-11-23" @default.
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• W3099758081 date "2017-03-10" @default.
• W3099758081 modified "2023-09-29" @default.
• W3099758081 title "Orbiting Clouds of Material at the Keplerian Co-rotation Radius of Rapidly Rotating Low-mass WTTs in Upper Sco" @default.
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• W3099758081 doi "https://doi.org/10.3847/1538-3881/aa5eb9" @default.
• W3099758081 hasPublicationYear "2017" @default.
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