Search Publications
TEMPLATES: Characterization of a Merger in the Dusty Lensing SPT0418–47 System
Hutchison, Taylor A.; Mahler, Guillaume; Rigby, Jane R. +24 more
We present JWST and Atacama Large Millimeter/submillimeter Array (ALMA) imaging for the lensing system SPT0418‑47, which includes a strongly lensed, dusty, star-forming galaxy at redshift z = 4.225 and an associated multiply imaged companion. The JWST NIRCam and MIRI imaging observations presented in this paper were acquired as part of the Early R…
X-ray view of dissipative warm corona in active galactic nuclei
Bianchi, S.; Petrucci, P. O.; Belmont, R. +8 more
Context. Detections of the X-ray spectra of active galactic nuclei (AGNs) typically reveal a noticeable excess of soft X-rays beyond the extrapolation of the power-law trend observed between 2 and 10 keV. However, the cause of this surplus remains unclear. In the scenario of soft Comptonization, observations suggest a warm corona temperature, rang…
E-XQR-30: The evolution of Mg II, C II, and O I across 2 < z < 6
Lai, Samuel; Bosman, Sarah E. I.; Meyer, Romain A. +12 more
Intervening metal absorbers in quasar spectra at z > 6 can be used as probes to study the chemical enrichment of the Universe during the Epoch of Reionization. This work presents the comoving line densities (dn/dX) of low-ionization absorbers, namely, Mg II (2796 Å), C II (1334 Å), and O I (1302 Å) across 2 < z < 6 using the E-XQR-30 meta…
Hunting down white dwarf-main sequence binaries using multiwavelength observations
Chatterjee, Sourav; Nayak, Prasanta K.; Ganguly, Anindya
Identification of white dwarfs (WD) with main-sequence (MS) companions and characterization of their properties can put important constraints on our understanding of binary stellar evolution and guide the theoretical predictions for a wide range of interesting transient events relevant for, e.g. Rubin Observatory (LSST), ZTF, and LISA. In this stu…
Mid-infrared Spectrum of the Disk around the Forming Companion GQ Lup B Revealed by JWST/MIRI
Banzatti, Andrea; MacDonald, Ryan J.; Stolker, Tomas +5 more
GQ Lup B is a forming brown dwarf companion (M ∼ 10–30 M J) showing evidence for an infrared excess associated with a disk surrounding the companion itself. Here we present mid-infrared (MIR) observations of GQ Lup B with the Medium Resolution Spectrometer (MRS) on JWST, spanning 4.8–11.7 µm. We remove the stellar contamination us…
A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): Impact of Galaxies on the Circumgalactic Medium Metal Enrichment at z > 6 Using the JWST and VLT
Chevallard, Jacopo; Hennawi, Joseph F.; Fan, Xiaohui +27 more
We characterize the multiphase circumgalactic medium (CGM) and galaxy properties at z = 6.0–6.5 in four quasar fields from the James Webb Space Telescope A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE) program. We use the Very Large Telescope/X-shooter spectra of quasar J0305–3150 to identify one new metal absorber at z = 6…
Examining the nature of the ultraluminous X-ray source Holmberg II X-1
Pinto, C.; Di Salvo, T.; Roberts, T. P. +4 more
We present a comprehensive spectral analysis of the ultraluminous X-ray source Holmberg II X-1 using broadband and high-resolution X-ray spectra taken with the XMM-Newton satellite over a period of 19 yr, taking advantage of data from a recent campaign. We tested several models for the broadband spectra, including a double thermal component provid…
Connecting remote and in situ observations of shock-accelerated electrons associated with a coronal mass ejection
Jebaraj, I. C.; Vainio, R.; Kilpua, E. K. J. +7 more
Context. One of the most prominent sources for energetic particles in our Solar System are huge eruptions of magnetised plasma from the Sun, known as coronal mass ejections (CMEs), which usually drive shocks that accelerate charged particles up to relativistic energies. In particular, energetic electron beams can generate radio bursts through the …
Secular change in the spin states of asteroids due to radiation and gravitation torques. New detections and updates of the YORP effect
Snodgrass, C.; Ehgamberdiev, Sh. A.; Kučáková, H. +21 more
Context. The rotation state of small asteroids is affected in the long term by perturbing torques of gravitational and radiative origin (the YORP effect). The former can be detected by a change in the spin-axis orientation in the inertial space; the latter manifests itself by a quadratic increase in the rotation phase.
Aims: Direct observatio…
No Longer Impossible: The Self-lensing Binary KIC 8145411 is a Triple
Bieryla, Allyson; Latham, David W.; El-Badry, Kareem +5 more
Five self-lensing binaries (SLBs) have been discovered with data from the Kepler mission. One of these systems is KIC 8145411, which was reported to host an extremely low mass (ELM; 0.2 M ⊙) white dwarf (WD) in a 456 days orbit with a solar-type companion. The system has been dubbed "impossible," because evolutionary models predict that…