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Exploring the photometric variability of ultra-cool dwarfs with TESS
Gómez Maqueo Chew, Yilen; Segura, Antígona; Jofré, Emiliano +2 more
We present a photometric characterization of 208 ultra-cool dwarfs (UCDs) with spectral types between M4 and L4, from 20-s and 2-min cadence TESS light curves. We determine rotation periods for 87 objects ($\sim 42~{{\ \rm per\ cent}}$) and identify 778 flare events in 103 UCDs ($\sim 49.5~{{\ \rm per\ cent}}$). For 777 flaring events (correspondi…
Gaia uncovers difference in B and Be star binarity at small scales: evidence for mass transfer causing the Be phenomenon
Oudmaijer, René D.; Vioque, Miguel; Dodd, Jonathan M. +2 more
Be stars make up almost 20 per cent of the B star population, and are rapidly rotating stars surrounded by a disc; however the origin of this rotation remains unclear. Mass transfer within close binaries provides the leading hypothesis, with previous detections of stripped companions to Be stars supporting this. Here, we exploit the exquisite astr…
Composition and thermal properties of Ganymede's surface from JWST/NIRSpec and MIRI observations
Saur, J.; Fry, P. M.; Fletcher, L. N. +21 more
Context. We present the first spectroscopic observations of Ganymede by the James Webb Space Telescope undertaken in August 2022 as part of the proposal "ERS observations of the Jovian system as a demonstration of JWST's capabilities for Solar System science".
Aims: We aimed to investigate the composition and thermal properties of the surface…
The Star Formation Efficiency during Reionization as Inferred from the Hubble Frontier Fields
Lidz, Adam; Sipple, Jackson
A recent ultraviolet luminosity function (UVLF) analysis in the Hubble Frontier Fields, behind foreground lensing clusters, has helped solidify estimates of the faint-end of the z ~ 5-9 UVLF at up to 5 mag fainter than in the field. These measurements provide valuable information regarding the role of low-luminosity galaxies in reionizing the univ…
Self-interacting Dark Matter Interpretation of Crater II
Yang, Daneng; Yu, Hai-Bo; Zhang, Xingyu +1 more
The satellite galaxy Crater II of the Milky Way is extremely cold and exceptionally diffuse. These unusual properties are challenging to understand in the standard model of cold dark matter. We use controlled N-body simulations to investigate the formation of Crater II in self-interacting dark matter (SIDM), where dark matter particles can scatter…
The metal-poor atmosphere of a potential sub-Neptune progenitor
Fortney, Jonathan J.; Désert, Jean-Michel; Petigura, Erik A. +12 more
Young transiting exoplanets offer a unique opportunity to characterize the atmospheres of freshly formed and evolving planets. We present the transmission spectrum of V1298 Tau b, a 23-Myr-old warm Jupiter-sized (0.91 ± 0.05 RJ, where RJ is the radius of Jupiter) planet orbiting a pre-main-sequence star. We detect a mostly cl…
The rate and contribution of mergers to mass assembly from NIRCam observations of galaxy candidates up to 13.3 billion years ago
Santini, Paola; Calabrò, Antonello; Castellano, Marco +8 more
We present an analysis of the galaxy merger rate in the redshift range
A biconical ionised gas outflow and evidence of positive feedback in NGC 7172 uncovered by MIRI/JWST
Rouan, D.; Rigopoulou, D.; Gandhi, P. +35 more
We present observations of the type-2 Seyfert NGC 7172 obtained with the medium-resolution spectrometer (MRS) of the Mid-Infrared Instrument (MIRI) on board the James Webb Space Telescope (JWST). This galaxy hosts one of the lowest ionised gas mass outflow rates (Ṁout ∼ 0.005 M⊙ yr‑1) in a sample of six active gala…
J-PLUS: Toward a homogeneous photometric calibration using Gaia BP/RP low-resolution spectra
Hernández-Monteagudo, C.; Hernán-Caballero, A.; Carrasco, J. M. +21 more
Aims: We present the photometric calibration of the 12 optical passbands for the Javalambre Photometric Local Universe Survey (J-PLUS) third data release (DR3) comprising 1642 pointings of two square degrees each.
Methods: We selected nearly 1.5 million main sequence stars with a signal-to-noise ratio larger than ten in the 12 J-PLUS pas…
High Hard X-Ray Polarization in Cygnus X-1 Confined to the Intermediate Hard State: Evidence for a Variable Jet Component
Rao, A. R.; Bhalerao, Varun; Mithun, N. P. S. +7 more
Cygnus X-1, the well-known accreting black hole system, exhibits several observational features hinting at an intricate interplay between the accretion disk, its atmosphere known as the corona, and the putative relativistic jet. It has been extensively studied using all available observational methods, including using the newly available technique…