Search Publications
Oxygen abundance of γ Vel from [O III] 88 µm Herschel/PACS spectroscopy
Hillier, D. J.; Morris, P. W.; Barlow, M. J. +4 more
We present Herschel PACS spectroscopy of the [O III] 88.4 µm fine-structure line in the nearby WC8+O binary system γ Vel to determine its oxygen abundance. The critical density of this line corresponds to several 105R* such that it is spatially extended in PACS observations at the 336 pc distance to γ Vel. Two approache…
Revising Properties of Planet–Host Binary Systems. IV. The Radius Distribution of Small Planets in Binary Star Systems Is Dependent on Stellar Separation
Huber, Daniel; Berger, Travis A.; Gaidos, Eric +10 more
Small planets (R p ≤ 4 R ⊕) are divided into rocky super-Earths and gaseous sub-Neptunes separated by a radius gap, but the mechanisms that produce these distinct planet populations remain unclear. Binary stars are the only main-sequence systems with an observable record of the protoplanetary disk lifetime and mass reservoi…
Dust around Massive Stars Is Agnostic to Galactic Environment: New Insights from PHAT/BEAST
Murray, Claire E.; Gordon, Karl D.; Peek, J. E. G. +2 more
Resolving the environments of massive stars is crucial for understanding their formation mechanisms and their impact on galaxy evolution. An important open question is whether massive stars found in diffuse regions outside spiral arms formed in situ or migrated there after forming in denser environments. To address this question, we use multiresol…
Gamma-Ray Burst Observations by the High-Energy Particle Detector on board the China Seismo-Electromagnetic Satellite between 2019 and 2021
Vitale, V.; Ubertini, P.; Bazzano, A. +68 more
In this paper we report the detection of five strong gamma-ray bursts (GRBs) by the High-Energy Particle Detector (HEPD-01) mounted on board the China Seismo-Electromagnetic Satellite, operational since 2018 on a Sun-synchronous polar orbit at a ~507 km altitude and 97° inclination. HEPD-01 was designed to detect high-energy electrons in the energ…
JWST imaging of the closest globular clusters: IV. Chemistry, luminosity, and mass functions of the lowest-mass members in the NIRISS parallel fields
Salaris, M.; Apai, D.; Anderson, J. +9 more
We present observations of the two closest globular clusters, NGC 6121 and NGC 6397, taken with the NIRISS detector of JWST. The combination of our new JWST data with archival Hubble Space Telescope (HST) images allows us to compute proper motions, disentangle cluster members from field objects, and probe the main sequence (MS) of the clusters dow…
ICECUBE AGN neutrino candidate PKS 1717+177: dark deflector bends nuclear jet
Popović, L. Č.; Britzen, S.; Zajaček, M. +8 more
The BL Lac object PKS 1717+177 has been identified as potential neutrino-emitting active galactic nuclei in the point source stacking analysis of ICECUBE data. We explore peculiarities in the morphology and kinematics of the jet and examine multiwavelength light curves for distinctive effects which might allow to pinpoint a likely neutrino generat…
oMEGACat. IV. Constraining the Ages of Omega Centauri Subgiant Branch Stars with HST and MUSE
Wang, Z.; Latour, M.; Kacharov, N. +13 more
We present age estimates for over 8100 subgiant branch (SGB) stars in Omega Centauri (ω Cen) to study its star formation history. Our large data set, which combines multi-wavelength Hubble Space Telescope photometry with MUSE metallicities, provides an unprecedented opportunity to measure individual stellar ages. We do this by fitting each star's …
NEOWISE Observations of Distant Active Long-period Comets C/2014 B1 (Schwartz), C/2017 K2 (Pan-STARRS), and C/2010 U3 (Boattini)
Masiero, Joseph R.; Milewski, Dave G.; Pittichová, Jana +3 more
Hyperactive comet activity typically becomes evident beyond the frost line (∼3–4 au) where it becomes too cold for water-ice to sublimate. If carbon monoxide (CO) and carbon dioxide (CO2) are the species that drive activity at sufficiently large distances, then detailed studies on the production rates of these species are extremely valu…
The Galactic bulge exploration. II. Line-of-sight velocity templates for single-mode RR Lyrae stars
Smolec, R.; Prudil, Z.; Kunder, A. +2 more
We present a new set of tools to derive systemic velocities for single-mode RR Lyrae stars from visual and near-infrared spectra. We derived scaling relations and line-of-sight velocity templates using both APOGEE and Gaia spectroscopic products combined with photometric G-band amplitudes. We provide a means to estimate systemic velocities for the…
A global view on star formation: The GLOSTAR Galactic plane survey: XI. Radio source catalog IV: 2° < ℓ < 28°, 36° < ℓ < 60° and |b| < 1°
Menten, K. M.; Khan, S.; Csengeri, T. +17 more
Context. The GLObal view on STAR formation in the Milky Way (GLOSTAR) survey studies star formation with the Very Large Array (VLA) and the Effelsberg 100 meter radio telescope in the Galactic plane between ‑2° < ℓ < 60° and |b| < 1°, and the Cygnus X region (76° < ℓ < 83° and ‑1° < b < 2°), with unprecedented sensitivity in b…