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FU Orionis disk outburst: Evidence for a gravitational instability scenario triggered in a magnetically dead zone
Labadie, L.; Lesur, G.; Monnier, J. D. +10 more
Context. FUors outbursts are a crucial stage of accretion in young stars. However, a complete mechanism at the origin of the outburst still remains missing.
Aims: We aim to constrain the instability mechanism in the star FU Orionis itself by directly probing the size and evolution in time of the outburst region with near-infrared (NIR) interf…
Another look at the dayside spectra of WASP-43b and HD 209458b: Are there scattering clouds?
Parmentier, Vivien; Taylor, Jake
The search for clouds on the dayside of hot Jupiters has been disadvantaged due to the limited number of high quality space-based observations of their dayside. To date, retrieval studies have found no evidence for grey clouds on the dayside, however none of these studies explored the impact of scattering clouds. In this study we reanalyse the day…
Assessing the physical reality of Milky Way open cluster candidates
Piatti, Andrés E.; Illesca, Denis M. F.; Massara, Agustina A. +4 more
We report results on the analysis of 11 new Milky Way open cluster candidates, recently discovered from the detection of stellar overdensities in the Vector Point diagram, by employing Xtreme deconvolution Gaussian mixture models. We treated these objects as real open clusters and derived their fundamental properties with their associated intrinsi…
HST viewing of spectacular star-forming trails behind ESO 137-001
Donahue, Megan; Voit, G. Mark; Fossati, Matteo +8 more
We present the results from the HST WFC3 and ACS data on an archetypal galaxy undergoing ram pressure stripping (RPS), ESO 137-001, in the nearby cluster Abell 3627. ESO 137-001 is known to host a prominent stripped tail detected in many bands from X-rays, H α to CO. The HST data reveal significant features indicative of RPS such as asymmetric dus…
Macrospicules and Their Connection to Magnetic Reconnection in the Lower Solar Atmosphere
Shen, Yuandeng; Zhou, Xinping; Duan, Yadan +4 more
Solar macrospicules are beam-like cool plasma ejections of size in between spicules and coronal jets, which can elucidate potential connections between plasma jetting activity at different scales. With high-resolution observations from the New Vacuum Solar Telescope and Solar Dynamics Observatory, we investigate the origin of five groups of recurr…
The Close AGN Reference Survey (CARS). A parsec-scale multi-phase outflow in the super-Eddington NLS1 Mrk 1044
Jahnke, K.; Gaspari, M.; Combes, F. +8 more
Context. The interaction between active galactic nuclei (AGNs) and their host galaxies is scarcely resolved. Narrow-line Seyfert 1 (NLS1) galaxies are believed to represent AGN at early stages of their evolution and to allow one to observe feeding and feedback processes at high black hole accretion rates.
Aims: We aim to constrain the propert…
Evolution of Neptune at near-infrared wavelengths from 1994 through 2022
de Pater, Imke; Wong, Michael H.; Hueso, Ricardo +16 more
Using archival near-infrared observations from the Keck and Lick Observatories and the Hubble Space Telescope, we document the evolution of Neptune's cloud activity from 1994 to 2022. We calculate the fraction of Neptune's disk that contained clouds, as well as the average brightness of both cloud features and cloud-free background over the planet…
Isochrone fitting of Galactic globular clusters - IV. NGC 6362 and NGC 6723
Gontcharov, George A.; Mosenkov, Aleksandr V.; Khovritchev, Maxim Yu +10 more
We present new isochrone fits to the colour-magnitude diagrams of the Galactic globular clusters NGC 6362 and NGC 6723. We utilize 22 and 26 photometric filters for NGC 6362 and NGC 6723, respectively, from the ultraviolet to mid-infrared using data sets from Hubble Space Telescope, Gaia, unWISE, and other photometric sources. We use models and is…
Systematic errors in the maximum-likelihood regression of Poisson count data: introducing the overdispersed χ2 distribution
Bonamente, Massimiliano
This paper presents a new method to estimate systematic errors in the maximum-likelihood regression of count data. The method is applicable in particular to X-ray spectra in situations where the Poisson log-likelihood, or the Cash goodness-of-fit statistic, indicate a poor fit that is attributable to overdispersion of the data. Overdispersion in P…
Constraining the White-dwarf Mass and Magnetic Field Strength of a New Intermediate Polar through X-Ray Observations
Hailey, Charles J.; Mori, Kaya; Ramsay, Gavin +9 more
We report timing and broadband spectral analysis of a Galactic X-ray source, CXOGBS J174517.0-321356 (J1745), with a 614 s periodicity. Chandra discovered the source in the direction of the Galactic Bulge. Gong proposed that J1745 was either an intermediate polar (IP) with a mass of ~1 M ⊙, or an ultracompact X-ray binary (UCXB). To con…