We present observations and dust tail models of activated asteroid P/2015 X6 from deep imaging data acquired at the 10.4 m Gran Telescopio Canarias (GTC) from...
Dust Reverberation Mapping in Distant Quasars from Optical and Mid-infrared Imaging Surveys
The size of the dust torus in active galactic nuclei (AGNs) and their high-luminosity counterparts, quasars, can be inferred from the time delay between UV...
Dusty Starbursts Masquerading as Ultra-high Redshift Galaxies in JWST CEERS Observations
Lyman-break galaxy (LBG) candidates at z ≳ 10 are rapidly being identified in James Webb Space Telescope (JWST)/NIRCam observations. Due to the (redshifted)...
Dusty Supernovae Running the Thermodynamics of the Matter Reinserted within Young and Massive Super Stellar Clusters
Following the observational and theoretical evidence that points at core-collapse supernovae (SNe) as major producers of dust, here we calculate the...
Dwarf Galaxies with Central Cores in Modified Newtonian Dynamics Gravity
Some dwarf galaxies are within the Mondian regime at all radii, i.e., the gravitational acceleration provided by the observed baryons is always below the...
Dynamical Confirmation of a Black Hole in MAXI J1820+070
We present time-resolved 10.4 m Gran Telescopio Canarias and 4.2 m William Herschel Telescope intermediate resolution spectroscopy of the X-ray transient MAXI...
We present outburst spectroscopy of GX 339-4 that may reveal the motion of its elusive companion star. N III lines exhibit sharp emission components moving over...
Dynamical Masses of the Binary Brown Dwarf GJ 569 Bab
We have obtained new images and high-resolution (R~22,400) near-infrared (1.2400-1.2575 μm) spectra of each component of the brown dwarf binary GJ 569 Bab using...
Dynamical Structure of Small Bulges Reveals Their Early Formation in ΛCDM Paradigm
The Λ cold dark matter (ΛCDM) paradigm of galaxy formation predicts that dense spheroidal stellar structures invariably grow at early cosmic time. These...