Search Publications
New variable sources revealed by DECam toward the LMC: The first 15 deg2
Nucita, A. A.; De Paolis, F.; Franco, A. +2 more
The Dark Energy Camera (DECam) is a sensitive, wide field instrument mounted at the prime focus of the 4 mV. Blanco Telescope in Chile. Beside its main objectives, i.e. understanding the growth and evolution of structures in the Universe, the camera offers the opportunity to observe a ∼ 3deg2 field of view in one single pointing and, wi…
Modelling gas around galaxy pairs and groups using the Q0107 quasar triplet
Tejos, Nicolas; Beckett, Alexander; Morris, Simon L. +3 more
We examine to what extent disc and outflow models can reproduce observations of H I gas within a few virial radii of galaxies in pairs and groups. Using highly sensitive HST/COS and FOS spectra of the Q0107 quasar triplet covering Ly α for z≲1, as well as a deep galaxy redshift survey including VIMOS, DEIMOS, GMOS, and MUSE data, we test simple di…
Understanding the radio emission from ϵ Eridani
Rodríguez, Luis F.; Lizano, Susana; Cantó, Jorge +1 more
Some solar-type stars are known to present faint, time-variable radio continuum emission whose nature is not clearly established. We report on Jansky Very Large Array observations of the nearby star ϵ Eridani at 10.0 and 33.0 GHz. We find that this star has flux density variations on scales down to days, hours, and minutes. On 2020 April 15 it exh…
33 New Stellar Angular Diameters from the NPOI, and Nearly 180 NPOI Diameters as an Ensemble
Stone, Jordan M.; von Braun, Kaspar; Schmitt, Henrique R. +2 more
We present new angular diameter measurements for 33 stars from the Navy Precision Optical Interferometer, reaching uncertainties on the limb-darkened diameter of 2% or less for 21 targets. We also determined the physical radius, bolometric flux, luminosity, and effective temperature for each star. Our sample is a mix of giant, subgiant, and dwarf …
Survey of H α
Jose, Jessy; Panwar, Neelam; Rishi, C.
Actively accreting young stellar objects show H
Masked-assisted radial-segmented target pulsed-laser deposition: A novel method for area-selective deposition using pulsed-laser deposition
Thyen, Laurenz; Splith, Daniel; Kneiß, Max +2 more
We introduce a novel technique, masked-assisted radial-segmented target pulsed-laser deposition (MARS-PLD) for unprecedented capabilities in area-selective physical vapor deposition. The MARS-PLD setup consists of a conventional PLD chamber with mechanical feedthrough for a laterally movable mask or mask set. By this means and, in principle, the a…
The Evolution of Multipole Moments for the Global Solar Magnetic Field
Wang, Weihua; Chu, Zhe; Gu, Haihua
Based on synoptic magnetic maps, we use spherical harmonic functions to decompose the global magnetic field of the Sun. Through the expansion coefficients, the power spectrum Cl, and its zonal component ClZ and sectorial component ClS for order l are defined. Through two sampled synoptic maps,…
Analysis of Front Side Halo CMEs and Their Solar Source Active Region and Flare Ribbon Properties
Moon, Y. -J.; Shanmugaraju, A.; Ebenezer, E. +3 more
Halo coronal mass ejections (CMEs) from the Sun are the subset of CMEs, which are more energetic than the normal CMEs. Only the more energetic CMEs are observable in white-light coronagraphs when they are traveling along the line of sight (LOS) and a CME is better observed when it is traveling perpendicularly to the LOS. We investigated the flare …
UV Spectral Characterization of Low-mass Stars with AstroSat UVIT for Exoplanet Applications: The Case Study of HIP 23309
Ranjan, Sukrit; Narang, Mayank; Pineda, J. Sebastian +1 more
Characterizing rocky exoplanet atmospheres is a key goal of exoplanet science, but interpreting such observations will require understanding the stellar ultraviolet (UV) irradiation incident on the planet from its host star. Stellar UV mediates atmospheric escape, photochemistry, and planetary habitability, and observations of rocky exoplanets can…
Observation of Turbulent Magnetohydrodynamic Cascade in the Jovian Magnetosheath
McComas, D. J.; Szalay, J. R.; Ebert, R. W. +6 more
We present the first estimation of the energy cascade rate in Jupiter's magnetosheath (MS). We use in situ observations from the Jovian Auroral Distributions Experiment and the magnetometer investigation instruments on board the Juno spacecraft, in concert with two recent compressible models, to investigate the cascade rate in the magnetohydrodyna…