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The structure of accreted stellar streams
Bovy, Jo; Qian, Yansong; Arshad, Yumna
Many of the Milky Way's globular clusters are likely accreted from satellite galaxies that have long since merged with the Milky Way. When these globular clusters are susceptible to tidal disruption, this process likely starts already inside the parent satellite leading to an early stellar stream within the satellite. When the parent satellite mer…
The Perkins INfrared Exosatellite Survey (PINES) I. Survey Overview, Reduction Pipeline, and Early Results
Muirhead, Philip S.; Theissen, Christopher; Bardalez Gagliuffi, Daniella C. +9 more
We describe the Perkins INfrared Exosatellite Survey (PINES), a near-infrared photometric search for short-period transiting planets and moons around a sample of 393 spectroscopically confirmed L- and T-type dwarfs. PINES is performed with Boston University's 1.8 m Perkins Telescope Observatory, located on Anderson Mesa, Arizona. We discuss the ob…
Data-driven, time-dependent modeling of pre-eruptive coronal magnetic field configuration at the periphery of NOAA AR 11726
Kilpua, E. K. J.; Pomoell, J.; Price, D. J. +4 more
Context. Data-driven, time-dependent magnetofrictional modeling has proved to be an efficient tool for studying the pre-eruptive build-up of energy for solar eruptions, and sometimes even the ejection of coronal flux ropes during eruptions. However, previous modeling works have illustrated the sensitivity of the results on the data-driven boundary…
Anomalous Cosmic-Ray Oxygen Observations into 0.1 au
McComas, D. J.; Christian, E. R.; Leske, R. A. +10 more
The Integrated Science Investigation of the Sun instrument suite onboard NASA's Parker Solar Probe mission continues to measure solar energetic particles and cosmic rays closer to the Sun than ever before. Here, we present the first observations of cosmic rays into 0.1 au (21.5 solar radii), focusing specifically on oxygen from ~2018.7 to ~2021.2.…
Spectroastrometry and Reverberation Mapping: The Mass and Geometric Distance of the Supermassive Black Hole in the Quasar 3C 273
Zhang, Zhi-Xiang; Du, Pu; Hu, Chen +4 more
The quasar 3C 273 has been observed with infrared spectroastrometry (SA) of the broad Paα line and optical reverberation mapping (RM) of the broad Hβ line. SA delivers information about the angular size and structure of the Paα broad-line region (BLR), while RM delivers information about the physical size and structure of the Hβ BLR. Based on the …
Signs of late infall and possible planet formation around DR Tau using VLT/SPHERE and LBTI/LMIRCam
Rouan, D.; Ertel, S.; Henning, T. +31 more
Context. Protoplanetary disks around young stars often contain substructures like rings, gaps, and spirals that could be caused by interactions between the disk and forming planets.
Aims: We aim to study the young (1-3 Myr) star DR Tau in the near-infrared and characterize its disk, which was previously resolved through submillimeter interfer…
Westerlund 1 under the light of Gaia EDR3: Distance, isolation, extent, and a hidden population
Maíz Apellániz, J.; Negueruela, I.; Alfaro, E. J. +3 more
Context. The young massive cluster Westerlund 1 offers the promise of a grand laboratory for the study of high-mass star evolution, but its basic parameters are still poorly known.
Aims: In this paper, we aim at a better characterisation of the cluster by determining some basic kinematic properties and analysing the area surrounding the clust…
Diffuse radio emission from non-Planck galaxy clusters in the LoTSS-DR2 fields
Simionescu, A.; Zhang, X.; Di Gennaro, G. +17 more
Context. The presence of large-scale magnetic fields and ultra-relativistic electrons in the intra-cluster medium (ICM) is confirmed through the detection of diffuse radio synchrotron sources, so-called radio halos and relics. Due to their steep-spectrum nature, these sources are rarely detected at frequencies above a few gigahertz, especially in …
The Unusually Weak and Exceptionally Steep Radio Relic in A2108
Lovisari, Lorenzo; Raychaudhury, Somak; Giacintucci, Simona +9 more
Mergers between galaxy clusters often drive shocks into the intracluster medium, the effects of which are sometimes visible via temperature and density jumps in the X-ray and via radio emission from relativistic particles energized by the shock's passage. A2108 was selected as a likely merger system through comparing the X-ray luminosity to the Pl…
Extremely Low-mass White Dwarf Stars Observed in Gaia DR2 and LAMOST DR8
Luo, Yangping; Németh, Péter; Wang, Kun +3 more
We present the first results from our ongoing project to study extremely low-mass (ELM) white dwarfs (WDs) (M ≤ 0.3M ⊙) with the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectra. Based on the LAMOST DR8 spectral database, we analyzed 136 ELM WD candidates selected from Gaia DR2 data and 12 known objects previou…