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Dust mineralogy and variability of the inner PDS 70 disk: Insights from JWST/MIRI MRS and Spitzer IRS observations
Henning, Thomas; Güdel, Manuel; Lagage, Pierre-Olivier +17 more
Context. The inner disk of the young star PDS 70 may be a site of rocky planet formation, with two giant planets detected further out. Recently, James Webb Space Telescope/Mid-Infrared Instrument (JWST/MIRI) Medium-Resolution Spectrometer (MRS) observations have revealed the presence of warm water vapour in the inner disk. Solids in the inner disk…
The Scavenger Hunt for Quasar Samples to Be Used as Cosmological Tools
Bargiacchi, Giada; Dainotti, Maria Giovanna; Lenart, Aleksander Łukasz +1 more
Although the Λ Cold Dark Matter model is the most accredited cosmological model, information at high redshifts (z) between type Ia supernovae (z=2.26) and the Cosmic Microwave Background (z=1100) is crucial to validate this model further. To this end, we have discovered a sample of 1132 quasars up to z=7.54 exhibiting a reduced intrinsic dispersio…
Ultradeep ATCA Imaging of 47 Tucanae Reveals a Central Compact Radio Source
Kamann, Sebastian; Dreizler, Stefan; Strader, Jay +9 more
We present the results of an ultradeep radio continuum survey, containing ~480 hr of observations, of the Galactic globular cluster 47 Tucanae with the Australia Telescope Compact Array. This comprehensive coverage of the cluster allows us to reach rms noise levels of 1.19 µJy beam-1 at 5.5 GHz, 940 nJy beam-1 at 9 GHz,…
Variability of Blue Supergiants in the LMC with TESS
de Mink, Selma E.; Johnston, Cole; Ma, Linhao +1 more
The blue supergiant (BSG) problem, namely, the overabundance of BSGs inconsistent with classical stellar evolution theory, remains an open question in stellar astrophysics. Several theoretical explanations have been proposed, which may be tested by their predictions for the characteristic time variability. In this work, we analyze the light curves…
LOFAR detection of extended emission around a mini halo in the galaxy cluster Abell 1413
Rossetti, M.; Shimwell, T. W.; Gastaldello, F. +14 more
Context. The relation between giant radio halos and mini halos in galaxy clusters is not understood. The former are usually associated with merging clusters, while the latter are found in relaxed systems. In recent years, the advent of low-frequency radio observations has challenged this dichotomy by finding intermediate objects with a hybrid radi…
Solar Wind Current Sheets: MVA Inaccuracy and Recommended Single-Spacecraft Methodology
Wang, R.; Phan, T. D.; Mozer, F. S. +1 more
We present the analysis of 1,831 current sheets (CS) observed aboard four Cluster spacecraft in a pristine solar wind. Four-spacecraft estimates of the CS normal and propagation velocity are compared with different single-spacecraft estimates. The Minimum Variance Analysis (MVA) of the magnetic field is shown to be highly inaccurate in estimating …
JWST Confirms the Nature of CID-42
Shen, Yue; Zhuang, Ming-Yang; Li, Junyao
The galaxy CID-42 (CXOC J100043.1+020637.2) at z = 0.359 has been proposed to contain a promising candidate for a gravitational-wave recoiling supermassive black hole (SMBH), a slingshot SMBH from a triple-SMBH interaction, or a kiloparsec-scale dual active galactic nucleus (AGN). These claims were primarily based on a pair of bright cores separat…
No evidence of active galactic nucleus features in the nuclei of Arp 220 from JWST/NIRSpec IFS
Charlot, Stéphane; Übler, Hannah; D'Eugenio, Francesco +12 more
Context. Arp 220 is the nearest ultra-luminous infrared galaxy. It shows evidence of 100 pc scale molecular outflows that are likely connected with galaxy-scale outflows traced by ionised and neutral gas. The two highly obscured nuclei of Arp 220 are sites of intense star formation, with extreme (far-infrared based) star formation rate surface den…
Radial evolution of the accuracy of ballistic solar wind backmapping
Maksimovic, M.; Démoulin, P.; Badman, S. T. +4 more
Context. Solar wind backmapping is a technique employed to connect in situ measurements of heliospheric plasma structures to their origin near the Sun. The most widely used method is ballistic mapping, which neglects the effects of solar wind acceleration and corotation and instead models the solar wind as a constant radial outflow whose speed is …
The evolution of catastrophically evaporating rocky planets
Owen, James E.; Curry, Alfred; Booth, Richard +1 more
In this work, we develop a rocky planet interior model and use it to investigate the evolution of catastrophically evaporating rocky exoplanets. These planets, detected through the dust tails produced by evaporative outflows from their molten surfaces, can be entirely destroyed in a fraction of their host star's lifetime. To allow for the major de…