Search Publications
The cooling of massive white dwarfs from Gaia EDR3
Caiazzo, Ilaria; Heyl, Jeremy; Fleury, Leesa
We determine the distribution of cooling ages of massive Gaia EDR3 white dwarfs identified with over 90 per cent probability within 200 pc and with mass in the range 0.95-1.25 M⊙. Using three sets of publicly available models, we consider sub-samples of these white dwarfs sorted into three equally spaced mass bins. Under the assumption …
Characteristics and evolution of sheath and leading edge structures of interplanetary coronal mass ejections in the inner heliosphere based on Helios and Parker Solar Probe observations
Temmer, M.; Bothmer, V.
Context. We investigated the plasma and magnetic field characteristics of the upstream regions of interplanetary coronal mass ejections (ICMEs) and their evolution as function of distance to the Sun in the inner heliosphere. Results are related both to the development of interplanetary shocks, sheath regions, and compressed solar wind plasma ahead…
Prominence eruption observed in He II 304 Å up to >6 R⊙ by EUI/FSI aboard Solar Orbiter
Heinzel, P.; Mierla, M.; Zhukov, A. N. +24 more
Aims: We report observations of a unique, large prominence eruption that was observed in the He II 304 Å passband of the Extreme Ultraviolet Imager/Full Sun Imager telescope aboard Solar Orbiter on 15-16 February 2022.
Methods: Observations from several vantage points - Solar Orbiter, the Solar-Terrestrial Relations Observatory, the Sola…
Sensitive Chandra coverage of a representative sample of weak-line quasars: revealing the full range of X-ray properties
Brandt, W. N.; Luo, B.; Garmire, G. P. +8 more
We present deeper Chandra observations for weak-line quasars (WLQs) in a representative sample that previously had limited X-ray constraints, and perform X-ray photometric analyses to reveal the full range of X-ray properties of WLQs. Only 5 of the 32 WLQs included in this representative sample remain X-ray undetected after these observations, and…
Expanding the Time Domain of Multiple Populations: Evidence of Nitrogen Variations in the 1.5 Gyr Old Star Cluster NGC 1783
Cadelano, Mario; Dalessandro, Emanuele; Salaris, Maurizio +5 more
We present the result of a detailed analysis of Hubble Space Telescope UV and optical deep images of the massive and young (~1.5 Gyr) stellar cluster NGC 1783 in the Large Magellanic Cloud. This system does not show evidence of multiple populations (MPs) along the red giant branch (RGB) stars. However, we find that the cluster main sequence (MS) s…
Red supergiants in M31: the Humphreys-Davidson limit at high metallicity
Beasor, Emma R.; Davies, Ben; McDonald, Sarah L. E.
The empirical upper limit to red supergiant (RSG) luminosity, known as the Humphreys-Davidson (HD) limit, has been commonly explained as being caused by the stripping of stellar envelopes by metallicity-dependent line-driven winds. As such, the theoretical expectation is that the HD limit should be higher at lower metallicity, where weaker mass-lo…
On Spectroscopic Phase-curve Retrievals: H2 Dissociation and Thermal Inversion in the Atmosphere of the Ultrahot Jupiter WASP-103 b
Changeat, Quentin
This work presents a reanalysis of the spectroscopic phase-curve observations of the ultrahot Jupiter WASP-103 b obtained by the Hubble Space Telescope (HST) and the Spitzer Telescope. Traditional 1D and unified 1.5D spectral retrieval techniques are employed, allowing to map the thermal structure and the abundances of trace gases in this planet a…
Ultraluminous high-redshift quasars from SkyMapper - II. New quasars and the bright end of the luminosity function
Fan, Xiaohui; Wolf, Christian; Lai, Samuel +5 more
We search for ultraluminous Quasi-Stellar Objects (QSOs) at high redshift using photometry from the SkyMapper Southern Survey Data Release 3 (DR3), in combination with 2MASS, VHS DR6, VIKING DR5, AllWISE, and CatWISE2020, as well as parallaxes and proper motions from Gaia DR2 and eDR3. We report 142 newly discovered Southern QSOs at 3.8 < z <…
The R-Process Alliance: Abundance Universality among Some Elements at and between the First and Second R-Process Peaks
Beers, Timothy C.; Placco, Vinicius M.; Holmbeck, Erika M. +11 more
We present new observational benchmarks of rapid neutron-capture process (r-process) nucleosynthesis for elements at and between the first (A ~ 80) and second (A ~ 130) peaks. Our analysis is based on archival ultraviolet and optical spectroscopy of eight metal-poor stars with Se (Z = 34) or Te (Z = 52) detections, whose r-process enhancement vari…
Hubble Asteroid Hunter. II. Identifying strong gravitational lenses in HST images with crowdsourcing
Bhatawdekar, Rachana; Merín, Bruno; Kruk, Sandor +3 more
Context. The Hubble Space Telescope (HST) archives constitute a rich dataset of high-resolution images to mine for strong gravitational lenses. While many HST programmes specifically target strong lenses, they can also be present by coincidence in other HST observations.
Aims: Our aim is to identify non-targeted strong gravitational lenses, w…