Search Publications
Comprehensive coverage of particle acceleration and kinetic feedback from the stellar mass black hole V404 Cygni
Motta, S. E.; Miller-Jones, J. C. A.; Williams, D. R. A. +8 more
We present analysis of comprehensive radio observations of the black hole V404 Cyg during its 2015 outburst. These data represent the best ever coverage of jet production and particle acceleration from any black hole. We report for the first time a clear and near-linear flux-rms correlation in the radio flux densities. Investigation of individual …
Sub-second infrared variability from the archetypal accreting neutron star 4U 1728-34
Stella, L.; Díaz Trigo, M.; Altamirano, D. +23 more
We report on the first simultaneous high-time resolution X-ray and infrared (IR) observations of a neutron star low mass X-ray binary in its hard state. We performed $\approx 2\,$ h of simultaneous observations of 4U 1728-34 using HAWK-I@VLT, XMM-Newton, and NuSTAR. The source displayed significant X-ray and IR variability down to sub-second time-…
An ALMA Survey of M-dwarfs in the Beta Pictoris Moving Group with two new debris disc detections
Kral, Quentin; Wyatt, Mark C.; Lestrade, Jean-François +4 more
Previous surveys in the far-infrared have found very few, if any, M-dwarf debris discs among their samples. It has been questioned whether M-dwarf discs are simply less common than earlier types, or whether the low detection rate derives from the wavelengths and sensitivities available to those studies. The highly sensitive, long-wavelength Atacam…
Understanding the Relationship between Solar Coronal Abundances and F10.7 cm Radio Emission
Long, David M.; Brooks, David H.; Baker, Deborah +7 more
Sun-as-a-star coronal plasma composition, derived from full-Sun spectra, and the F10.7 radio flux (2.8 GHz) have been shown to be highly correlated (r = 0.88) during solar cycle 24. However, this correlation becomes nonlinear during increased solar magnetic activity. Here we use cotemporal, high spatial resolution, multiwavelength images of the Su…
Spectroscopic substellar initial mass function of NGC 2244
Bayo, A.; Peña Ramírez, K.; Bouy, H. +10 more
Context. The dominant formation channel of brown dwarfs (BDs) is not well constrained yet and a promising way to discriminate between scenarios is to test the environment-dependent efficiency in forming BDs. So far, the outcome of star formation, studied through the initial mass function, has been found to be very similar in all clusters that have…
H I filaments as potential compass needles? Comparing the magnetic field structure of the Small Magellanic Cloud to the orientation of GASKAP-H I filaments
Lee, M. -Y.; McClure-Griffiths, N. M.; van Loon, J. Th +12 more
High-spatial-resolution H I observations have led to the realization that the nearby (within few hundreds of parsecs) Galactic atomic filamentary structures are aligned with the ambient magnetic field. Enabled by the high-quality data from the Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope for the Galactic ASKAP H I survey, w…
Infrared Ejecta and Cold Dust in the Young Supernova Remnant N132D
Slavin, Jonathan D.; Rho, Jeonghee; Ravi, Aravind P. +1 more
We present Spitzer, Wide-field Infrared Survey Explorer (WISE), and Herschel observations of the young supernova remnant (SNR) N132D in the Large Magellanic Cloud, including 3-40 µm Spitzer Infrared Spectrograph (IRS) mapping, 12 µm WISE and 70, 100, 160, 250, 350, and 500 µm Herschel images. The high-velocity lines of [Ne II] at…
Flybys in debris disk systems with Gaia eDR3
Kim, M.; Roccatagliata, V.; Bertini, L.
Context. Debris disks represent the last phase of the evolution of protoplanetary disks around young stellar objects where planetary systems had most likely already been formed. Resolved systems show peculiar structures, such as asymmetries or spirals, which may be associated with either the presence of a low-mass companion or dynamical interactio…
Revisiting the Red Giant Branch Hosts KOI-3886 and ι Draconis. Detailed Asteroseismic Modeling and Consolidated Stellar Parameters
Chaplin, William J.; Kane, Stephen R.; Huber, Daniel +23 more
Asteroseismology is playing an increasingly important role in the characterization of red giant host stars and their planetary systems. Here, we conduct detailed asteroseismic modeling of the evolved red giant branch (RGB) hosts KOI-3886 and ι Draconis, making use of end-of-mission Kepler (KOI-3886) and multisector TESS (ι Draconis) time-series ph…
Delayed Development of Cool Plasmas in X-Ray Flares from the Young Sun-like Star κ 1 Ceti
Hamaguchi, Kenji; Toriumi, Shin; Arzoumanian, Zaven +3 more
The Neutron star Interior Composition Explorer (NICER) X-ray observatory observed two powerful X-ray flares equivalent to superflares from the nearby young solar-like star κ 1 Ceti in 2019. NICER follows each flare from the onset through the early decay, collecting over 30 counts s-1 near the peak, enabling a detailed spectra…