Matches in SemOpenAlex for { <https://semopenalex.org/work/W4298114549> ?p ?o ?g. }
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- W4298114549 abstract "$kappa$CrB is a ${sim}2.5,$Gyr old K1 sub-giant star, with an eccentric exo-Jupiter at ${sim}2.8,$au and a debris disc at tens of au. We present ALMA Band 6 ($1.3,$mm) and HST scattered light ($0.6,mu$m) images, demonstrating $kappa$CrB's broad debris disc, covering an extent $50{-}180,$au in the millimetre (peaking at $110,$au), and $51{-}280,$au in scattered light (peaking at $73,$au). By modelling the millimetre emission, we estimate the dust mass as ${sim}0.016,M{oplus}$, and constrain lower-limit planetesimal sizes as $D_{rm{max}}{>}1,$km and the planetesimal belt mass as $M_{rm{disc}}{>}1,M_{oplus}$. We constrain the properties of an outer body causing a linear trend in 17 years of radial velocity data to have a semi-major axis $8{-}66,$au and a mass $(0.4{-}120),M_{rm{Jup}}$. There is a large inner cavity seen in the millimetre emission, which we show is consistent with carving by such an outer massive companion with a string of lower mass planets. Our scattered light modelling shows that the dust must have a high anisotropic scattering factor ($g{sim}0.8{-}0.9$) but an inclination ($i{sim}30{-}40,$degrees) that is inferred to be significantly lower than the $i{sim}61,$degrees millimetre inclination. The origin of such a discrepancy is unclear, but could be caused by a misalignment in the micron and millimetre sized dust. We place an upper limit on the CO gas mass of $M_{rm{CO}}{<}(4.2{-}13){times}10^{-7},M_{oplus}$, and show this to be consistent with levels expected from planetesimal collisions, or from CO-ice sublimation as $kappa$CrB begins its giant branch ascent." @default.
- W4298114549 created "2022-10-01" @default.
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- W4298114549 date "2022-09-29" @default.
- W4298114549 modified "2023-10-14" @default.
- W4298114549 title "High-resolution ALMA and <i>HST</i> imaging of κCrB: a broad debris disc around a post-main-sequence star with low-mass companions" @default.
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