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Unveiling the population of dual and lensed active galactic nuclei at sub-arcsec separations
Marconi, A.; Pancino, E.; Nardini, E. +12 more
All cosmological models of structure formation predict the existence of a widespread population of dual supermassive black holes in-spiralling inside their common host galaxy, eventually merging and giving rise to intense gravitational waves. These systems can be identified as dual active galactic nuclei (AGNs) at kiloparsec separations, but only …
A pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 characterized with CHEOPS
Lester, Kathryn V.; Charnoz, Sébastien; Triaud, Amaury H. M. J. +132 more
We report the discovery and characterization of a pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 (TIC 79748331), initially detected in the Transiting Exoplanet Survey Satellite (TESS) photometry. To characterize the system, we performed and retrieved the CHaracterising ExOPlanets Satellite (CHEOPS), TESS, and ground-based photometry, …
The population of hot subdwarf stars studied with Gaia. IV. Catalogues of hot subluminous stars based on Gaia EDR3
Geier, S.; Pelisoli, I.; Culpan, R. +3 more
In light of substantial new discoveries of hot subdwarfs by ongoing spectroscopic surveys and the availability of the Gaia mission Early Data Release 3 (EDR3), we compiled new releases of two catalogues of hot subluminous stars: The data release 3 (DR3) catalogue of the known hot subdwarf stars contains 6616 unique sources and provides multi-band …
The K2 Galactic Archaeology Program Data Release 3: Age-abundance Patterns in C1-C8 and C10-C18
Lewis, Geraint F.; Vanderburg, Andrew; Chaplin, William J. +28 more
We present the third and final data release of the K2 Galactic Archaeology Program (K2 GAP) for Campaigns C1-C8 and C10-C18. We provide asteroseismic radius and mass coefficients, κ R and κ M , for ~19,000 red giant stars, which translate directly to radius and mass given a temperature. As such, K2 GAP DR3 represents the l…
The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve
Alonso, R.; Deleuil, M.; Erikson, A. +83 more
Context. Gas giants orbiting close to hot and massive early-type stars can reach dayside temperatures that are comparable to those of the coldest stars. These `ultra-hot Jupiters' have atmospheres made of ions and atomic species from molecular dissociation and feature strong day-to-night temperature gradients. Photometric observations at different…
The PLATO field selection process. I. Identification and content of the long-pointing fields
Heras, A. M.; Deleuil, M.; Rauer, H. +26 more
PLAnetary Transits and Oscillations of stars is an ESA M-class satellite planned for launch by the end of 2026 and dedicated to the wide-field search of transiting planets around bright and nearby stars, with a strong focus on discovering habitable rocky planets hosted by solar-like stars. The choice of the fields to be pointed at is a crucial tas…
The complex time and energy evolution of quasi-periodic eruptions in eRO-QPE1
Salvato, M.; Buchner, J.; Nandra, K. +8 more
Quasi-periodic eruptions (QPEs) are recurrent X-ray bursts found in the nuclei of low-mass galaxies. Their trigger mechanism is still unknown, but recent models involving one or two stellar-mass companions around the central massive (≈105 − 106 M⊙) black hole have gathered significant attention. While these models …
Being KLEVER at cosmic noon: Ionized gas outflows are inconspicuous in low-mass star-forming galaxies but prominent in massive AGN hosts
Maiolino, Roberto; Cresci, Giovanni; Jones, Gareth C. +13 more
We investigate the presence of ionized gas outflows in a sample of 141 main-sequence star-forming galaxies at 1.2 < z < 2.6 from the KLEVER (KMOS Lensed Emission Lines and VElocity Review) survey. Our sample covers an exceptionally wide range of stellar masses, 8.1 < log (M⋆/M⊙) < 11.3, pushing outflow studies int…
Dark dimension, the swampland, and the dark matter fraction composed of primordial black holes
Anchordoqui, Luis A.; Antoniadis, Ignatios; Lüst, Dieter
Very recently, it was suggested that combining the swampland program with the smallness of the dark energy and confronting these ideas to experiment lead to the prediction of the existence of a single extra dimension (dubbed the dark dimension) with characteristic length scale in the micron range. We show that the rate of Hawking radiation slows d…
The X-Ray and Radio Loud Fast Blue Optical Transient AT2020mrf: Implications for an Emerging Class of Engine-driven Massive Star Explosions
Kulkarni, S. R.; Chandra, Poonam; Perley, Daniel A. +9 more
We present AT2020mrf (SRGe J154754.2+443907), an extra-galactic (z = 0.1353) fast blue optical transient (FBOT) with a rise time of t g,rise = 3.7 days and a peak luminosity of M g,peak = -20.0. Its optical spectrum around peak shows a broad (v ~ 0.1c) emission feature on a blue continuum (T ~ 2 × 104 K), which b…