Search Publications
Redshifts of candidate host galaxies of four fast X-ray transients using VLT/MUSE
Jonker, Peter G.; Bauer, Franz E.; Levan, Andrew J. +3 more
Context. Fast X-ray transients (FXTs) are X-ray flares that last from minutes to hours. Multi-wavelength counterparts to these FXTs have proven hard to find. As a result, distance measurements are made through indirect methods such as a host galaxy identification. Of the three main models proposed for FXTs, that is, supernova shock breakout emissi…
Embedded Young Stellar Objects near H72.97-69.39: A Forming Super Star Cluster in N79
Hirschauer, Alec S.; Lenkić, Laura; Meixner, Margaret +10 more
We present 102 embedded young stellar object (YSO) candidates associated with the H72.97-69.39 super star cluster (SSC) in the Large Magellanic Cloud (LMC). With the use of the James Webb Space Telescope Mid-Infrared Instrument (MIRI) imaging mode, we utilize an F770W – F1000W versus F1000W color–magnitude diagram to select 70 YSO candidates. An a…
Correction of instrument temperature dependence of detector responsivity for measurements of comet 67P acquired by Rosetta's Visible and InfraRed Thermal Imaging Spectrometer, Mapping channel (VIRTIS-M)
D'Aversa, E.; Kappel, D.; Erard, S. +8 more
The Mapping channel of the Visible and InfraRed Thermal Imaging Spectrometer (VIRTIS-M) aboard Rosetta acquired many hyperspectral images of comet 67P/Churyumov–Gerasimenko (hereafter 67P). The VIS channel detector responsivity was dependent on the VIS detector temperature (TVIS). This affects the absolute values of the measured spectra (for a TVI…
The Intermittency of Turbulence in Magneto-Hydodynamical Simulations and in the Cosmos
Falgarone, Edith; Hily-Blant, Pierre; Lesaffre, Pierre
Turbulent dissipation is a central issue in the star and galaxy formation process. Its fundamental property of space-time intermittency, well characterised in incompressible laboratory experiments, remains elusive in cosmic turbulence. Progress requires the combination of state-of-the-art modelling, numerical simulations and observations. The powe…
Slim-disk modeling reveals an accreting intermediate-mass black hole in the luminous fast blue optical transient AT2018cow
Wen, Sixiang; Jonker, Peter G.; Zabludoff, Ann I. +1 more
The origin of the most luminous subclass of the fast blue optical transients (LFBOTs) is still unknown. We present an X-ray spectral analysis of AT2018cow – the LFBOT archetype – using NuSTAR, Swift, and XMM-Newton data. The source spectrum can be explained by the presence of a slim accretion disk, and we find that the mass accretion rate decrease…
Exploring the ex-situ components within Gaia DR3
Zhao, Gang; Chen, Yuqin; Xue, Xiang-Xiang +3 more
The presence of Gaia DR3 provides a large sample of stars with complete 6D information, offering a fertile ground for the exploration of stellar objects that were accreted to the Milky Way through ancient merger events. In this study, we developed a deep learning methodology to identify ex-situ stars within the Gaia DR3 catalogue. After two phases…
Variations in the Radius Distribution of Single- and Compact Multiple-transiting Planets
Dittmann, Jason A.; Ballard, Sarah; Liberles, Benjamin T. +1 more
Previous work has established the enhanced occurrence of compact systems of multiple small exoplanets around metal-poor stars. Understanding the origin of this effect in the planet formation process is a topic of ongoing research. Here we consider the radii of planets residing in systems of multiple transiting planets, compared to those residing i…
Local Transition of Electron Pitch Angle Distribution within Flux Pileup Region behind Dipolarization Front
Cao, J. B.; Liu, Y. Y.; Liu, C. M. +2 more
Dipolarization fronts (DFs), earthward-propagating magnetic transients with a strong magnetic field, are important regions favorable for energetic electron acceleration in the magnetotail. The DF-driven electron acceleration usually generates coherent pitch angle distributions (PADs) inside flux pileup regions (FPRs), i.e., strong magnetic field r…
Lithium Cepheid V708 Car with an unusual chemical composition
Werner, K.; Korotin, S. A.; Andrievsky, S. M. +2 more
Aims: The purpose of this work is to spectroscopically analyse the classical Cepheid V708 Car. A preliminary check of the spectrum of V708 Car showed that this is a lithium-rich supergiant. We also found that V708 Car has an unusual chemical composition in that the abundances of various elements correlate with their condensation temperatures.…
Extreme-value modelling of the brightest galaxies at z ≳ 9
Silk, Joseph; Heather, Cameron; Chantavat, Teeraparb +1 more
Data from the JWST have revealed an intriguing population of bright galaxies at high redshifts. In this work, we use extreme-value statistics to calculate the distribution [in ultraviolet (UV) magnitude] of the brightest galaxies in the redshift range