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A Model for Coronal Inflows and In/Out Pairs
Lynch, Benjamin J.
This report presents a three-dimensional (3D) numerical magnetohydrodynamics (MHD) model of the white-light coronagraph observational phenomena known as coronal inflows and in/out pairs. Coronal inflows in the Large Angle and Spectrometric Coronagraph/C2 field of view (approximately $2\mbox{--}6\,{R}_{\odot }$ ) were thought to arise from the dyna…
Spatial power spectra of dust across the Local Group: No constraint on disc scale height
Sandstrom, Karin M.; Leroy, Adam K.; Koch, Eric W. +4 more
We analyse the 1D spatial power spectra of dust surface density and mid to far-infrared emission at 24-500 µm in the LMC, SMC, M31, and M33. By forward-modelling the point spread function (PSF) on the power spectrum, we find that nearly all power spectra have a single power-law and point source component. A broken power-law model is only fav…
Structural and Dynamical Analysis of 0.1 pc Cores and Filaments in the 30 Doradus-10 Giant Molecular Cloud
Lebouteiller, Vianney; Indebetouw, Rémy; Wong, Tony +4 more
High-resolution (<0.1 pc) Atacama Large Millimeter/submillimeter Array (ALMA) observations of the 30Dor-10 molecular cloud 15 pc north of R136 are presented. The 12CO 2-1 emission morphology contains clumps near the locations of known mid-IR massive protostars, as well as a series of parsec-long filaments oriented almost directly tow…
The post-common-envelope binary central star of the planetary nebula PN G283.7-05.1. A possible post-red-giant-branch planetary nebula central star
Corradi, R. L. M.; Boffin, H. M. J.; Jones, D. +8 more
We present the discovery and characterisation of the post-common-envelope central star system in the planetary nebula PN G283.7-05.1. Deep images taken as part of the POPIPlaN survey indicate that the nebula may possess a bipolar morphology similar to other post-common-envelope planetary nebulae. Simultaneous light and radial velocity curve modell…
Near-infrared Imaging of a Spiral in the CQ Tau Disk
Currie, Thayne; Dong, Ruobing; Kwon, Jungmi +28 more
We present L'-band Keck/NIRC2 imaging and H-band Subaru/AO188+HiCIAO polarimetric observations of the CQ Tau disk with a new spiral arm. Apart from the spiral feature, our observations could not detect any companion candidates. We traced the spiral feature from the r2-scaled High-Contrast Coronographic Imager for Adaptive Optics (HiCIAO…
Interstellar comet 2I/Borisov exhibits a structure similar to native Solar system comets
Bedin, L. R.; Ochner, P.; Manzini, F. +1 more
We processed images taken with the Hubble Space Telescope(HST) to investigate any morphological features in the inner coma suggestive of a peculiar activity on the nucleus of the interstellar comet 2I/Borisov. The coma shows an evident elongation, in the position angle (PA) ∼0-180○ direction, which appears related to the presence of a j…
The extreme colliding-wind system Apep: resolved imagery of the central binary and dust plume in the infrared
Callingham, J. R.; Crowther, P. A.; Marcote, B. +6 more
The recent discovery of a spectacular dust plume in the system 2XMM J160050.7-514245 (referred to as 'Apep') suggested a physical origin in a colliding-wind binary by way of the 'Pinwheel' mechanism. Observational data pointed to a hierarchical triple-star system, however, several extreme and unexpected physical properties seem to defy the establi…
The search for disks or planetary objects around directly imaged companions: a candidate around DH Tauri B
Ertel, S.; Henning, T.; Brandner, W. +45 more
Context. In recent decades, thousands of substellar companions have been discovered with both indirect and direct methods of detection. While the majority of the sample is populated by objects discovered using radial velocity and transit techniques, an increasing number have been directly imaged. These planets and brown dwarfs are extraordinary so…
The Pre-He White Dwarf in the Post-mass Transfer Binary EL CVn
Gies, Douglas R.; Lester, Kathryn V.; Wang, Luqian +8 more
EL CVn is the prototype of a class of eclipsing binaries that consist of an A- or F-type main-sequence star and a hot, low-mass, pre-He white dwarf (pre-He WD), the stripped down remains of the former mass donor. Here we present the first direct detection and characterization of the spectrum of the pre-He WD in EL CVn that was made possible throug…
Global analysis of the TRAPPIST Ultra-Cool Dwarf Transit Survey
Queloz, D.; Delrez, L.; Gillon, M. +10 more
We conducted a global analysis of the TRAPPIST Ultra-Cool Dwarf Transit Survey - a prototype of the SPECULOOS transit search conducted with the TRAPPIST-South robotic telescope in Chile from 2011 to 2017 - to estimate the occurrence rate of close-in planets such as TRAPPIST-1b orbiting ultra-cool dwarfs. For this purpose, the photometric data of 4…