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The Newly Discovered Nova Super-remnant Surrounding Recurrent Nova T Coronae Borealis: Will it Light Up during the Coming Eruption?
Walter, Frederick M.; Shara, Michael M.; Lanzetta, Kenneth M. +7 more
A century or less separates the thermonuclear-powered eruptions of recurrent novae (RNe) in the hydrogen-rich envelopes of massive white dwarfs. The colliding ejecta of successive RN events are predicted to always generate very large (tens of parsecs) super-remnants; only two examples are currently known. T CrB offers an excellent opportunity to t…
The Hubble Constant Anchor Galaxy NGC 4258: Metallicity and Distance from Blue Supergiants
Li, Siyang; Riess, Adam G.; Yuan, Wenlong +5 more
A quantitative spectroscopic study of blue supergiant stars in the Hubble constant anchor galaxy NGC 4258 is presented. The non-LTE analysis of Keck I telescope LRIS spectra yields a central logarithmic metallicity (in units of the solar value) of [Z] = ‑0.05 ± 0.05 and a very shallow gradient of ‑(0.09 ± 0.11) r/r 25 with respect to ga…
Observation of a Large-Scale Filament Eruption Initiated by Two Small-Scale Erupting Filaments Pushing Out from Below
Song, Yongliang; Zhang, Mei; Ji, Kaifan +9 more
Filament eruptions often result in flares and coronal mass ejections (CMEs). Most studies attribute the filament eruptions to their instabilities or magnetic reconnection. In this study, we report a unique observation of a filament eruption whose initiation process has not been reported before. This large-scale filament, with a length of about 360…
A comparative study of dust grain polarization efficiencies in the interstellar and intracluster mediums towards anticentre galaxy
Jose, Jessy; Eswaraiah, Chakali; Gopinathan, Maheswar +2 more
Dust polarization observations at optical wavelengths help understand the dust grain properties and trace the plane-of-the-sky component of the magnetic field. In this study, we make use of published optical polarization data acquired with AIMPOL along with distances (d) and extinction (AV) data. We study the variation of polarization e…
Recovering the gravitational potential in a rotating frame: Deep Potential applied to a simulated barred galaxy
Green, Gregory M.; Ghosh, Soumavo; Kalda, Taavet
Stellar kinematics provides a window into the gravitational field, and therefore into the distribution of all mass, including dark matter. Deep Potential is a method for determining the gravitational potential from a snapshot of stellar positions in phase space, using mathematical tools borrowed from deep learning to model the distribution functio…
Benchmarking the effective temperature scale of red giant branch stellar models: The case of the metal-poor halo giant HD 122563
Salaris, M.; Creevey, O. L.; Thévenin, F. +2 more
Context. There is plenty of evidence in the literature of significant discrepancies between the observations and models of metal-poor red giant branch stars, in particular regarding the effective temperature Teff scale. Aims. We revisit the benchmark star HD 122563 using the most recent observations from Gaia Data Release 3, to investig…
The New Horizons Extended Mission Target: Arrokoth Search and Discovery
Fabbro, S.; Stern, S. Alan; Weaver, Harold A. +37 more
Following the Pluto flyby of the New Horizons spacecraft, the mission provided a unique opportunity to explore the Kuiper Belt in situ. The possibility existed to fly by a Kuiper Belt object (KBO), as well as to observe additional objects at distances closer than are feasible from Earth-orbit facilities. However, at the time of launch no KBOs were…
Abundances of trace constituents in Jupiter's atmosphere inferred from Herschel/PACS observations
Villanueva, G. L.; Hartogh, P.; Lellouch, E. +4 more
Context. On October 31, 2009, the Photodetector Array Camera and Spectrometer (PACS) on board the Herschel Space Observatory observed far-infrared spectra of Jupiter in the wavelength range between 50 and 220 µm as part of the program "Water and Related Chemistry in the Solar System". The spectra have an effective spectral resolution between 900 a…
Magnetic Fields in the Southern Coalsack and Beyond
Magalhães, A. M.; Kawabata, Koji S.; Rodrigues, C. V. +4 more
Starlight polarimetry, when combined with accurate distance measurements, allows for exploration of the three-dimensional structure of local magnetic fields in great detail. We present optical polarimetric observations of stars in and close to the Southern Coalsack, taken from the Interstellar Polarization Survey. Located in five fields of view ap…
Mid-infrared evidence for iron-rich dust in the multi-ringed inner disk of HD 144432
Waters, L. B. F. M.; Woitke, P.; Augereau, J. -C. +40 more
Context. Rocky planets form by the concentration of solid particles in the inner few au regions of planet-forming disks. Their chemical composition reflects the materials in the disk available in the solid phase at the time the planets were forming. Studying the dust before it gets incorporated in planets provides a valuable diagnostic for the mat…