Search Publications
Non-thermal electrons in an eruptive solar event: Magnetic structure, confinement, and escape into the heliosphere
Klein, Karl-Ludwig; Kollhoff, Alexander; Salas Matamoros, Carolina +1 more
Context. Filament eruptions and coronal mass ejections (CMEs) reveal large-scale instabilities of magnetic structures in the solar corona. Some of them are accompanied by radio emission, which at decimetric and longer wavelengths is a signature of electron acceleration that may be different from the acceleration in impulsive flares. The radio emis…
Testing Cluster Membership of Planetary Nebulae with High-precision Proper Motions. I. HST Observations of JaFu 1 Near the Globular Cluster Palomar 6
Bond, Howard E.; Sahu, Kailash C.; Bellini, Andrea
If a planetary nebula (PN) is shown to be a member of a star cluster, we obtain important new constraints on the mass and chemical composition of the PN's progenitor star, which cannot be determined for PNe in the field. Cluster membership can be tested by requiring the projected separation between the PN and cluster to be within the tidal radius …
Discovery of Globular Cluster Candidates in the Dwarf Irregular Galaxy IC 2574 Using HST/ACS Imaging
Forbes, Duncan A.; Read, Justin I.; Collins, Michelle L. M. +1 more
We report the discovery of 23 globular cluster (GC) candidates around the relatively isolated dwarf galaxy IC 2574 within the Messier 81 (M81) group, at a distance of 3.86 Mpc. We use observations from the HST Advanced Camera for Surveys (ACS) to analyse the imaging in the F814W and F555W broad-band filters. Our GC candidates have luminosities ran…
The stellar occultation by (319) Leona on 2023 September 13 in preparation for the occultation of Betelgeuse
Gutiérrez, P. J.; Luque-Escamilla, P. L.; Alvarez-Candal, A. +43 more
On 2023 December 12, the star α Orionis will be occulted by asteroid (319) Leona. This represents an extraordinary and unique opportunity to analyse the brightness distribution of Betelgeuse's photosphere with extreme angular resolution by studying light curves from different points on Earth and at different wavelengths. Here we present observatio…
Far-ultraviolet to Far-infrared Spectral Energy Distribution Modeling of the Star Formation History across M31
Hopkins, Andrew M.; Leahy, Denis A.; Hansen, Jakob
Our neighboring galaxy M31 has been recently surveyed at the far- and near-ultraviolet (FUV and NUV) with the UVIT telescope on AstroSat, which provides unprecedented sensitivity to young stellar populations. Here the UVIT data are supplemented with optical data, near-infrared (IR) data (Spitzer), and mid- and far-IR data (Herschel). The observati…
Comparison of magnetic data products from Solar Orbiter SO/PHI-FDT and SDO/HMI
Woch, J.; Solanki, S. K.; Schou, J. +34 more
Context. The Polarimetric and Helioseismic Imager (SO/PHI), on board the Solar Orbiter mission, is the first photospheric magnetograph and tachograph to observe the Sun from outside the Sun-Earth line. The Full Disc Telescope (FDT) of SO/PHI, images the whole solar disk with a spatial resolution that varies with the distance between the Sun and th…
A Complete 16 µm Selected Galaxy Sample at z ∼ 1. II. Morphological Analysis
Cheng, Cheng; Huang, Jia-Sheng; Dai, Y. Sophia +2 more
We present a morphological analysis of the 16 µm flux-density-limited galaxy sample at 0.8 < z < 1.3 from Huang et al. (2021). At the targeted redshift, the 16 µm emission corresponds to the polycyclic aromatic hydrocarbon feature from intense star formation, or dust heated by active galactic nuclei (AGN). Our sample of 479 galax…
Modeling Circumstellar Gas Emission around a White Dwarf Using CLOUDY
Weinberger, Alycia J.; Steele, Amy; Xu, Siyi +9 more
The chemical composition of an extrasolar planet is fundamental to its formation, evolution, and habitability. In this study, we explore a new way to measure the chemical composition of the building blocks of extrasolar planets by measuring the gas composition of the disrupted planetesimals around white dwarf stars. As a first attempt, we used the…
Direct Observational Evidence of Multi-epoch Massive Star Formation in G24.47+0.49
Sanhueza, Patricio; Tej, Anandmayee; Hwang, Jihye +19 more
Using new continuum and molecular line data from the Atacama Large Millimeter/submillimeter Array Three-millimeter Observations of Massive Star-forming Regions (ATOMS) survey and archival Very Large Array, 4.86 GHz data, we present direct observational evidence of hierarchical triggering relating three epochs of massive star formation in a ringlik…
The Epoch of Giant Planet Migration Planet Search Program. II. A Young Hot Jupiter Candidate around the AB Dor Member HS Psc
Cochran, William D.; Mahadevan, Suvrath; Tran, Quang H. +6 more
We report the discovery of a hot Jupiter candidate orbiting HS Psc, a K7 (≈0.7 M ⊙) member of the ≈130 Myr AB Doradus moving group. Using radial velocities over 4 yr from the Habitable-zone Planet Finder spectrograph at the Hobby–Eberly Telescope, we find a periodic signal of ${P}_{b}={3.986}_{-0.003}^{+0.044}$ days. A joint Keplerian a…