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Gravitational Wave Search through Electromagnetic Telescopes
Kohri, Kazunori; Ito, Asuka; Nakayama, Kazunori
We study the graviton-photon conversion in the magnetic fields of the Earth, the Milky Way, and intergalactic regions. Requiring that the photon flux converted from gravitons does not exceed the observed photon flux with telescopes, we derive upper limits on the stochastic gravitational waves in frequency ranges from 107-1035…
Establishing a mass-loss rate relation for red supergiants in the Large Magellanic Cloud
Zapartas, E.; Munoz-Sanchez, G.; de Wit, S. +3 more
Context. The high mass-loss rates of red supergiants (RSGs) drastically affect their evolution and final fate, but their mass-loss mechanism remains poorly understood. Various empirical prescriptions scaled with luminosity have been derived in the literature, yielding results with a dispersion of two to three orders of magnitude.
Aims: We det…
Young, wild, and free: The early expansion of star clusters
Dalessandro, E.; Vesperini, E.; Livernois, A. +1 more
Early expansion plays a fundamental role in the dynamical evolution of young star clusters. However, until very recently most of our understanding of cluster expansion was based only on indirect evidence or on statistically limited samples of clusters. Here we present a comprehensive kinematic analysis of virtually all known young Galactic cluster…
JWST study of the DG Tau B disk-wind candidate. I. Overview and nested H2-CO outflows
Podio, L.; Dougados, C.; Tabone, B. +5 more
Context. The origin of outflows and their impact on protoplanetary disk evolution and planet-formation processes are still crucial open questions. DG Tau B is a Class I protostar associated with a structured disk and a rotating conical CO outflow and was recently identified by ALMA as one of the best CO disk wind candidate. It is therefore a perfe…
Constraints on the narrow-line region of the X-ray quasi-periodic eruption source GSN 069
Filippenko, Alexei V.; Chiaberge, Marco; Miniutti, Giovanni +5 more
The origins of quasi-periodic eruptions (QPEs) are poorly understood, although most theoretical explanations invoke an accretion disc around a supermassive black hole. The gas and stellar environments in the galactic nuclei of these sources are also poorly constrained. In this paper, we present an analysis of archival Hubble Space Telescope (HST) …
O Corona, where art thou? eROSITA's view of UV-optical-IR variability-selected massive black holes in low-mass galaxies
Haberl, F.; Zezas, A.; Georgakakis, A. +16 more
Finding massive black holes (MBHs, MBH ≈ 104-107 M⊙) in the nuclei of low-mass galaxies ≤ft( {{M_*}\mathop {\mathop < \limits_ }\limits_ {{10}10}{M_ ȯ }} \right) is crucial to constrain seeding and growth of black holes over cosmic time, but it is particularly challenging due to their low a…
JWST-MIRI Spectroscopy of Warm Molecular Emission and Variability in the AS 209 Disk
Banzatti, Andrea; Wilner, David J.; Cleeves, L. Ilsedore +24 more
We present MIRI Medium-resolution Spectrograph observations of the large, multi-gapped protoplanetary disk around the T Tauri star AS 209. The observations reveal hundreds of water vapor lines from 4.9–25.5 µm toward the inner ∼1 au in the disk, including the first detection of rovibrational water emission in this disk. The spectrum is domin…
Stellar Cruise Control: Weakened Magnetic Braking Leads to Sustained Rapid Rotation of Old Stars
Davies, Guy R.; Metcalfe, Travis S.; van Saders, Jennifer L. +8 more
Despite a growing sample of precisely measured stellar rotation periods and ages, the strength of magnetic braking and the degree of departure from standard (Skumanich-like) spin-down have remained persistent questions, particularly for stars more evolved than the Sun. Rotation periods can be measured for stars older than the Sun by leveraging ast…
Extending the chemical reach of the H3 survey: detailed abundances of the dwarf-galaxy stellar stream Wukong/LMS-1
Conroy, Charlie; Ting, Yuan-Sen; Naidu, Rohan P. +10 more
We present the first detailed chemical-abundance analysis of stars from the dwarf-galaxy stellar stream Wukong/LMS-1 covering a wide metallicity range ($-3.5 \lt \rm [Fe/H] \lesssim -1.3$). We find abundance patterns that are effectively indistinguishable from the bulk of Indus and Jhelum, a pair of smaller stellar streams proposed to be dynamical…
The Width of Magnetic Ejecta Measured near 1 au: Lessons from STEREO-A Measurements in 2021–2022
Lugaz, Noé; Zhuang, Bin; Scolini, Camilla +7 more
Coronal mass ejections (CMEs) are large-scale eruptions with a typical radial size at 1 au of 0.21 au but their angular width in interplanetary space is still mostly unknown, especially for the magnetic ejecta (ME) part of the CME. We take advantage of STEREO-A angular separation of 20°–60° from the Sun–Earth line from 2020 October to 2022 August,…