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Near to Mid-infrared Spectroscopy of (65803) Didymos as Observed by JWST: Characterization Observations Supporting the Double Asteroid Redirection Test
de León, Julia; Lucchetti, Alice; Pajola, Maurizio +17 more
The Didymos binary asteroid was the target of the Double Asteroid Redirection Test (DART) mission, which intentionally impacted Dimorphos, the smaller member of the binary system. We used the Near-Infrared Spectrograph and Mid-Infrared Instrument instruments on JWST to measure the 0.6-5 and 5-20 µm spectra of Didymos approximately two months…
Nearby galaxies in the LOFAR Two-metre Sky Survey. II. The magnetic field-gas relation
Beck, R.; Drabent, A.; Brüggen, M. +8 more
Context. Magnetic fields, which regulate stellar feedback and star formation in galaxies, are key to understanding galaxy evolution.
Aims: We probe the origin of magnetic fields in late-type galaxies, measuring magnetic field strengths and exploring whether magnetic fields are only passive constituents of the interstellar medium or whether, b…
Source counts at 7.7-21 µm in CEERS field with JWST
Kilerci, Ece; Hashimoto, Tetsuya; Goto, Tomotsugu +8 more
Source counts - the number density of sources as a function of flux density - represent one of the fundamental metrics in observational cosmology due to their straightforward and simple nature. It is an important tool that provides information on galaxy formation and evolution. Source counting is a direct measurement. Compared to advanced analyses…
Barium stars as tracers of s-process nucleosynthesis in AGB stars. II. Using machine learning techniques on 169 stars
Pereira, C. B.; Cseh, B.; Drake, N. A. +7 more
Context. Barium (Ba) stars are characterised by an abundance of heavy elements made by the slow neutron capture process (s-process). This peculiar observed signature is due to the mass transfer from a stellar companion, bound in a binary stellar system, to the Ba star observed today. The signature is created when the stellar companion is an asympt…
WD J004917.14-252556.81: the most massive pulsating white dwarf
Córsico, Alejandro H.; Althaus, Leandro G.; Kilic, Mukremin +3 more
We present Apache Point Observatory (APO) and Gemini time-series photometry of WD J004917.14-252556.81, an ultramassive DA white dwarf with $T_{\rm eff} = 13\, 020$ K and log g = 9.34. We detect variability at two significant frequencies, making J0049-2525 the most massive pulsating white dwarf currently known with M⋆ = 1.31 M⊙
The stellar population responsible for a kiloparsec-size superbubble seen in the JWST 'phantom' images of NGC 628
Luna, A.; Gómez-González, V. M. A.; Mayya, Y. D. +11 more
We here study the multiband properties of a kiloparsec-size superbubble in the late-type spiral galaxy NGC 628. The superbubble is the largest of many holes seen in the early release images using James Webb Space Telescope (JWST)/MIRI filters that trace the polycyclic aromatic hydrocarbon (PAH) emissions. The superbubble is located in the interarm…
An Investigation of Open Clusters Berkeley 68 and Stock 20 Using CCD UBV and Gaia DR3 Data
Yontan, Talar
We performed detailed photometric and astrometric analyses of the open star clusters Berkeley 68 and Stock 20. This was based on ground-based CCD UBV photometric data complemented by space-based Gaia Data Release 3 (DR3) photometry and astrometry. A total of 198 and 51 stars were identified as likely cluster members for Berkeley 68 and Stock 20, r…
Data-driven selection and spectral classification of white dwarf stars
Bergeron, P.; Dufour, P.; Vincent, Olivier
The next generation of spectroscopic surveys is expected to provide spectra for hundreds of thousands of white dwarf (WD) candidates in the upcoming years. Currently, spectroscopic classification of white dwarfs is mostly done by visual inspection, requiring substantial amounts of expert attention. We propose a data-driven pipeline for fast, autom…
Redshifting galaxies from DESI to JWST CEERS: Correction of biases and uncertainties in quantifying morphology
Cheng, Cheng; Sun, Fengwu; Yu, Si-Yue +2 more
Observations of high-redshift galaxies with unprecedented detail have now been rendered possible with the James Webb Space Telescope (JWST). However, accurately quantifying their morphology remains uncertain due to potential biases and uncertainties. To address this issue, we used a sample of 1816 nearby DESI galaxies, with a stellar mass range of…
Origin and Extent of the Opacity Challenge for Atmospheric Retrievals of WASP-39 b
de Wit, Julien; Niraula, Prajwal; Gordon, Iouli E. +2 more
As the James Webb Space Telescope (JWST) came online last summer, we entered a new era of astronomy. This new era is supported by data products of unprecedented information content that require novel reduction and analysis techniques. Recently, Niraula et al. (N22) highlighted the need for upgraded opacity models to prevent facing a model-driven a…