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On the Origin of the North Celestial Pole Loop
Martin, Peter G.; Marchal, Antoine
The North Celestial Pole Loop (NCPL) provides a unique laboratory for studying the early-stage precursors of star formation. Uncovering its origin is key to understanding the dynamical mechanisms that control the evolution of its contents. In this study, we explore the 3D geometry and the dynamics of the NCPL using high-resolution dust extinction …
Introducing the Condor Array Telescope. I. Motivation, Configuration, and Performance
Walter, Frederick M.; Shara, Michael M.; Lanzetta, Kenneth M. +4 more
The "Condor Array Telescope" or "Condor" is a high-performance "array telescope" comprised of six apochromatic refracting telescopes of objective diameter 180 mm, each equipped with a large-format, very low-read-noise (≈1.2 e-), very rapid-read-time (<1 s) CMOS camera. Condor is located at a very dark astronomical site in the southwe…
Magnetic fluxes of solar active regions of different magneto-morphological classes - I. Cyclic variations
Abramenko, Valentina I.; Suleymanova, Regina A.; Zhukova, Anastasija V.
Data for 3046 solar active regions (ARs) observed since 1996 May 12 to 2021 December 27 were utilized to explore how the magnetic fluxes from ARs of different complexity follow the solar cycle. Magnetograms from the Michelson Doppler Imager instrument on the Solar and Heliospheric Observatory and from the Helioseismic and Magnetic Imager instrumen…
Gaia DR3 features of the phase spiral and its possible relation to internal perturbations
Li, Chengdong; Siebert, Arnaud; Famaey, Benoit +2 more
Disc stars from the Gaia DR3 RVS catalogue are selected to explore the phase spiral in the Galaxy. The data reveal a two-armed phase spiral pattern in the local z-vz plane inside the solar radius, which appears clearly when colour-coded by ⟨vR⟩(z, vz): this is characteristic of a breathing mode that can in principl…
A brown dwarf donor and an optically thin accretion disc with a complex stream impact region in the period-bouncer candidate BW Sculptoris
Neustroev, Vitaly V.; Mäntynen, Iikka
We present an analysis of multi-epoch spectroscopic and photometric observations of the WZ Sge-type dwarf nova BW Scl, a period-bouncer candidate. We detected multiple irradiation-induced emission lines from the donor star allowing the radial velocity variations to be measured with high accuracy. Also, using the absorption lines Mg II 4481 Å and C…
Gaia Data Release 3. Surface brightness profiles of galaxies and host galaxies of quasars
Ducourant, C.; Gavras, P.; Pourbaix, D. +13 more
Context. Since July 2014, the Gaia space mission has been continuously scanning the sky and observing the extragalactic Universe with unprecedented spatial resolution in the optical domain (∼180 mas by the end of the mission). Gaia provides an opportunity to study the morphology of the galaxies of the local Universe (z < 0.45) with much higher …
Characterising fast-time variations in the hard X-ray time profiles of solar flares using Solar Orbiter's STIX
Krucker, Säm; Harra, Louise K.; Hayes, Laura A. +2 more
Aims: The aim of this work is to develop a method to systematically detect and characterise fast-time variations (≳1 s) in the non-thermal hard X-ray (HXR) time profiles of solar flares using high-resolution data from Solar Orbiter's Spectrometer/Telescope for Imaging X-rays (STIX).
Methods: The HXR time profiles were smoothed using Gaus…
Characterization of a Set of Small Planets with TESS and CHEOPS and an Analysis of Photometric Performance
Torres, Guillermo; Bieryla, Allyson; Stassun, Keivan G. +41 more
The radius valley carries implications for how the atmospheres of small planets form and evolve, but this feature is visible only with highly precise characterizations of many small planets. We present the characterization of nine planets and one planet candidate with both NASA TESS and ESA CHEOPS observations, which adds to the overall population…
Properties of luminous red supergiant stars in the Magellanic Clouds
Boutsia, K.; Zapartas, E.; de Wit, S. +5 more
Context. There is evidence that some red supergiants (RSGs) experience short-lived phases of extreme mass loss, producing copious amounts of dust. These episodic outburst phases help strip the hydrogen envelope from evolved massive stars, drastically affecting their evolution. However, to date, the observational data of episodic mass loss is limit…
Beyond the ultradeep frontier fields and legacy observations (BUFFALO): a high-resolution strong+weak-lensing view of Abell 370
Sharon, K.; Diego, J. M.; Zitrin, A. +16 more
The HST treasury programme BUFFALO provides extended wide-field imaging of the six Hubble Frontier Fields galaxy clusters. Here we present the combined strong and weak-lensing analysis of Abell 370, a massive cluster at z = 0.375. From the reconstructed total projected mass distribution in the 6 arcmin × 6 arcmin BUFFALO field-of-view, we obtain t…