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Main-sequence companions to white dwarfs - II. The age-activity-rotation relation from a sample of Gaia common proper motion pairs
Gänsicke, B. T.; Tremblay, P. -E.; Hollands, M. A. +8 more
Magnetic activity and rotation are related to the age of low-mass main-sequence stars. To further constrain these relations, we study a sample of 574 main-sequence stars members of common proper motion pairs with white dwarfs, identified thanks to Gaia astrometry. We use the white dwarfs as age indicators, while the activity indexes and rotational…
Modeling of the cold electron plasma density for radiation belt physics
Merkin, V. G.; Pierrard, V.; Ukhorskiy, A. Y. +8 more
This review focusses strictly on existing plasma density models, including ionospheric source models, empirical density models, physics-based and machine-learning density models. This review is framed in the context of radiation belt physics and space weather codes. The review is limited to the most commonly used models or to models recently devel…
AT2018dyk revisited: a tidal disruption event candidate with prominent infrared echo and delayed X-ray emission in a LINER galaxy
Jiang, Ning; Huang, Shifeng; Wang, Tinggui +2 more
The multiwavelength data of nuclear transient AT2018dyk, initially discovered as a changing-look low-ionization nuclear emission-line region (LINER) galaxy, has been revisited by us and found being in agreement with a tidal disruption event (TDE) scenario. The optical light curve of AT2018dyk declines as a power-law form approximately with index -…
Supermassive Black Hole Winds in X-rays: SUBWAYS. II. HST UV spectroscopy of winds at intermediate redshifts
Kaastra, J. S.; Kriss, G. A.; Bianchi, S. +35 more
We present a UV spectroscopic study of ionized outflows in 21 active galactic nuclei (AGN), observed with the Hubble Space Telescope (HST). The targets of the Supermassive Black Hole Winds in X-rays (SUBWAYS) sample were selected with the aim to probe the parameter space of the underexplored AGN between the local Seyfert galaxies and the luminous …
Disentangling the AGN and Star formation Contributions to the Radio-X-Ray Emission of Radio-loud Quasars at 1 < Z < 2
Azadi, Mojegan; Fazio, Giovanni G.; Meyer, Eileen T. +12 more
We constrain the emission mechanisms responsible for the prodigious electromagnetic output generated by active galactic nuclei (AGNs) and their host galaxies with a novel state-of-the-art AGN radio-to-X-ray spectral energy distribution model fitting code (ARXSED). ARXSED combines multiple components to fit the spectral energy distributions (SEDs) …
Brightness and mass accretion rate evolution during the 2022 burst of EX Lupi
Lykou, F.; Varga, J.; Kóspál, Á. +18 more
Context. EX Lupi is the prototype by which EXor-type outbursts have been defined. It has experienced multiple accretion-related bursts and outbursts throughout the past decades, and the study of these events has greatly extended our knowledge about their effects. Notably, this star experienced a new burst in 2022.
Aims: We aim to investigate …
ALMA Resolves the First Strongly Lensed Optical/Near-IR-dark Galaxy
Lapi, Andrea; Bressan, Alessandro; Perrotta, Francesca +6 more
We present high-resolution (≲0.″1) Atacama Large Millimeter/submillimeter Array observations of the strongly lensed galaxy HATLASJ113526.2-01460 at redshift z ∼ 3.1, discovered in the GAMA 12th field of the Herschel-ATLAS survey. This gravitationally lensed system is remarkably peculiar, in that neither the background source nor the foreground len…
The Variable Detection of Atmospheric Escape around the Young, Hot Neptune AU Mic b
Youngblood, Allison; Lowrance, Patrick J.; Mann, Andrew W. +5 more
Photoevaporation is a potential explanation for several features within exoplanet demographics. Atmospheric escape observed in young Neptune-sized exoplanets can provide insight into and characterize which mechanisms drive this evolution and at what times they dominate. AU Mic b is one such exoplanet, slightly larger than Neptune (4.19 R ⊕
Radio variable and transient sources on minute time-scales in the ASKAP pilot surveys
Bannister, Keith W.; Kaplan, David L.; Lenc, Emil +12 more
We present results from a radio survey for variable and transient sources on 15-min time-scales, using the Australian SKA Pathfinder (ASKAP) pilot surveys. The pilot surveys consist of 505 h of observations conducted at around 1 GHz observing frequency, with a total sky coverage of 1476 deg2. Each observation was tracked for approximate…
Time evolution of Ce as traced by APOGEE using giant stars observed with the Kepler, TESS and K2 missions
Chiappini, C.; Tailo, M.; Miglio, A. +11 more
Context. Abundances of slow neutron-capture process (s-process) elements in stars with exquisite asteroseismic, spectroscopic, and astrometric constraints offer a novel opportunity to study stellar evolution, nucleosynthesis, and Galactic chemical evolution.
Aims: We investigate one of the least studied s-process elements in the literature, c…