Search Publications
J-PLUS: Photometric Recalibration with the Stellar Color Regression Method and an Improved Gaia XP Synthetic Photometry Method
Huang, Yang; Beers, Timothy C.; Cenarro, A. J. +19 more
We employ the corrected Gaia Early Data Release 3 photometric data and spectroscopic data from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR7 to assemble a sample of approximately 0.25 million FGK dwarf photometric standard stars for the 12 J-PLUS filters using the stellar color regression (SCR) method. We then independ…
Protoplanetary disks around young stellar and substellar objects in the σ
Paul, K. T.; Jose, Jessy; Damian, Belinda +1 more
Understanding the evolution and dissipation of protoplanetary disks are crucial in star and planet formation studies. We report the protoplanetary disk population in the nearby young
AllBRICQS: The All-sky BRIght, Complete Quasar Survey
Wolf, Christian; Lai, Samuel; Onken, Christopher A. +3 more
We describe the first results from the All-sky BRIght, Complete Quasar Survey (AllBRICQS), which aims to discover the last remaining optically bright quasars. We present 156 spectroscopically confirmed quasars (140 newly identified) having $|b|>10^{\circ}$ . 152 of the quasars have Gaia DR3 magnitudes brighter than $BP=16.5$ or $R
C3PO: towards a complete census of co-moving pairs of stars - I. High precision stellar parameters for 250 stars
Bitsch, Bertram; Ting, Yuan-Sen; Dotter, Aaron +6 more
We conduct a line-by-line differential analysis of a sample of 125 co-moving pairs of stars (dwarfs and subgiants near solar metallicity). We obtain high-precision stellar parameters with average uncertainties in effective temperature, surface gravity, and metallicity of 16.5 K, 0.033 and 0.014 dex, respectively. We classify the co-moving pairs of…
LEMON: LEns MOdelling with Neural networks - I. Automated modelling of strong gravitational lenses with Bayesian Neural Networks
Koopmans, Léon V. E.; Li, Rui; Gentile, Fabrizio +4 more
The unprecedented number of gravitational lenses expected from new-generation facilities such as the ESA Euclid telescope and the Vera Rubin Observatory makes it crucial to rethink our classical approach to lens-modelling. In this paper, we present LEMON (Lens Modelling with Neural networks): a new machine-learning algorithm able to analyse hundre…
Peering into the central region of a nano-quasar: XMM-Newton and Chandra views of the CH Cyg symbiotic system
Toalá, J. A.; Sabin, L.; González-Martín, O. +3 more
We present the analysis of archival XMM-Newton and Chandra observations of CH Cyg, one of the most studied symbiotic stars (SySts). The combination of the high-resolution XMM-Newton RGS and Chandra HETG X-ray spectra allowed us to obtain reliable estimates of the chemical abundances and to corroborate the presence of multitemperature X-ray-emittin…
Hot subdwarfs in close binaries observed from space. II. Analyses of the light variations
Geier, S.; Pelisoli, I.; Schaffenroth, V. +2 more
Context. Hot subdwarfs in close binaries with either M dwarf, brown dwarf, or white dwarf companions show unique light variations. In hot subdwarf binaries with M dwarf or brown dwarf companions, we can observe the so-called reflection effect, while in hot subdwarfs with close white dwarf companions, we find ellipsoidal modulation and/or Doppler b…
Black hole and galaxy co-evolution in radio-loud active galactic nuclei at z ∼ 0.3-4
Castignani, G.; Combes, F.; Poitevineau, R.
The relation between the mass of the supermassive black hole (SMBH) in the center of galaxies and their bulge mass or central velocity dispersion is well known. This suggests a coevolution between the SMBHs and their galaxy hosts. Our aim is to study this relation, specifically, for radio loud galaxies, and as a function of redshift z. We selected…
What Are the Radial Distributions of Density, Outflow Rates, and Cloud Structures in the M82 Wind?
Henry, Alaina; Heckman, Timothy; Xu, Xinfeng +2 more
Galactic winds play essential roles in the evolution of galaxies through the feedback they provide. Despite intensive studies of winds, the radial distributions of their properties and feedback are rarely observable. Here we present such measurements for the prototypical starburst galaxy, M82, based on observations by the Subaru Telescope. We dete…
The McDonald Accelerating Stars Survey: Architecture of the Ancient Five-planet Host System Kepler-444
Cochran, William D.; Endl, Michael; Isaacson, Howard T. +11 more
We present the latest and most precise characterization of the architecture for the ancient (≈11 Gyr) Kepler-444 system, which is composed of a K0 primary star (Kepler-444 A) hosting five transiting planets and a tight M-type spectroscopic binary (Kepler-444 BC) with an A-BC projected separation of 66 au. We have measured the system's relative ast…