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Tracing Accretion onto Herbig Ae/Be Stars Using the Brγ Line
Sierra L. Grant, Catherine C. Espaillat, Sean Brittain +2
Accretion plays an important role in protoplanetary disk evolution, and it is thought that the accretion mechanism changes between low- and high-mass stars. Here, we characterize a…
Near-Infrared Polarization from Unresolved Disks Around Brown Dwarfs and Young Stellar Objects
Dan P. Clemens, Thushara G. S. Pillai, Anneliese M. Rilinger +1
Wide-field near-infrared (NIR) polarimetry was used to examine disk systems around two brown dwarfs (BD) and two young stellar objects (YSO) embedded in the Heiles Cloud 2 (HCl2) d…
Testing the Potential for Radio Variability in Disks around T Tauri Stars with Observations and Chemical Modeling
C. C. Espaillat, E. Macias, J. Wendeborn +5
A multiwavelength observing campaign of the T Tauri star (TTS) GM Aur was undertaken in 2019 December that obtained Swift X-ray and NUV fluxes, HST NUV spectra, LCOGT ugri and TESS…
The dispersal of protoplanetary discs -- III: Influence of stellar mass on disc photoevaporation
Giovanni Picogna, Barbara Ercolano, Catherine C. Espaillat
The strong X-ray irradiation from young solar-type stars may play a crucial role in the thermodynamics and chemistry of circumstellar discs, driving their evolution in the last sta…
Measuring the Density Structure of an Accretion Hot Spot
C. C. Espaillat, C. E. Robinson, M. M. Romanova +5
Magnetospheric accretion models predict that matter from protoplanetary disks accretes onto the star via funnel flows which follow the stellar field lines and shock on the stellar…
UV Fluorescence Traces Gas and LyA Evolution in Protoplanetary Disks
Nicole Arulanantham, Kevin France, Keri Hoadley +5
Ultraviolet spectra of protoplanetary disks trace distributions of warm gas at radii where rocky planets form. We combine HST-COS observations of H2 and CO emission from 12 classic…