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Physical and chemical complexity in high-mass star-forming regions with ALMA. I. Overview and evolutionary trends of physical properties
Henning, Th.; Beuther, H.; Ahmadi, A. +3 more
Context. High-mass star formation is a hierarchical process from cloud (>1 pc), to clump (0.1−1 pc), to core scales (<0.1 pc). Modern interferometers that achieve high angular resolutions at millimeter wavelengths allow us to probe the physical and chemical properties of the gas and dust of protostellar cores in the earliest evolutionary for…
The High-energy Spectrum of the Young Planet Host V1298 Tau
France, Kevin; Pineda, J. Sebastian; Duvvuri, Girish M. +4 more
V1298 Tau is a young pre-main-sequence star hosting four known exoplanets that are prime targets for transmission spectroscopy with current-generation instruments. This work pieces together observations from the NICER X-ray telescope, the Space Telescope Imaging Spectrograph and Cosmic Origins Spectrograph instruments aboard Hubble Space Telescope…
Dimming of Continuum Captured in Mrk 841: New Clues on the Nature of the Soft X-Ray Excess
Kriss, Gerard A.; Mehdipour, Missagh; Mao, Junjie +2 more
We report on a remarkable change in the spectral energy distribution (SED) of Mrk 841, providing new insights on how the soft X-ray excess emission in active galactic nuclei (AGNs) is produced. By Swift monitoring of a sample of Seyfert-1 galaxies, we found an X-ray spectral hardening event in Mrk 841. We thereby triggered our XMM-Newton, NuSTAR, …
The CORALIE survey for southern extrasolar planets. XIX. Brown dwarfs and stellar companions unveiled by radial velocity and astrometry
Bouchy, F.; Queloz, D.; Ségransan, D. +17 more
Context. A historical search for exoplanets among a sample of 1647 nearby southern main sequence stars with the CORALIE spectrograph at La Silla Observatory has been underway since 1998, with a backup subprogram dedicated to the monitoring of binary stars.
Aims: We reviewed 25 years of CORALIE measurements and search for Doppler signals consi…
Optical and X-ray studies of Be/X-ray binary 1A 0535+262 during its 2020 giant outburst
Naik, Sachindra; Jana, Arghajit; Jaisawal, Gaurava K. +3 more
We report results obtained from the optical and X-ray studies of the Be/X-ray binary 1A 0535+262/HD 245770 during the 2020 October giant X-ray outburst, using the 1.2-m telescope at Mount Abu Infrared observatory and AstroSat, respectively. The peak flux of the outburst was recorded to be ~11 Crab in the 15-50 keV range, the highest ever observed …
Gaia-ESO survey: Massive stars in the Carina Nebula. I. A new census of OB stars
Gosset, E.; Herrero, A.; Comerón, F. +16 more
Context. The Carina Nebula is one of the major massive star-forming regions in the Galaxy. Its relatively nearby distance (2.35 kpc) makes it an ideal laboratory for the study of massive star formation, structure, and evolution, both for individual stars and stellar systems. Thanks to the high-quality spectra provided by the Gaia-ESO survey and th…
TOI-1442 b and TOI-2445 b: Two potentially rocky ultra-short period planets around M dwarfs
Tamura, M.; Pallé, E.; Hirano, T. +52 more
Context. Exoplanets with orbital periods of less than one day are known as ultra-short period (USP) planets. They are relatively rare products of planetary formation and evolution processes, but especially favourable for characterisation with current planet detection methods. At the time of writing, 125 USP planets have already been confirmed.
The Most Obscured AGNs in the XMM-SERVS Fields
Brandt, W. N.; Zou, Fan; Bauer, Franz E. +9 more
We perform X-ray spectral analyses to derive the characteristics (e.g., column density, X-ray luminosity) of ≈10,200 active galactic nuclei (AGNs) in the XMM-Spitzer Extragalactic Representative Volume Survey, which was designed to investigate the growth of supermassive black holes across a wide dynamic range of cosmic environments. Using physical…
Unusually long path length for a nearly scatter-free solar particle event observed by Solar Orbiter at 0.43 au
Kouloumvakos, Athanasios; Xu, Zigong; Wimmer-Schweingruber, Robert F. +28 more
Context. After their acceleration and release at the Sun, solar energetic particles (SEPs) are injected into the interplanetary medium and are bound to the interplanetary magnetic field (IMF) by the Lorentz force. The expansion of the IMF close to the Sun focuses the particle pitch-angle distribution, and scattering counteracts this focusing. Sola…
An excursion into the core of the cluster lens Abell 1689
Scarlata, Claudia; Liesenborgs, Jori; Alavi, Anahita +3 more
Abell 1689 is a well-studied cluster of galaxies and one of the largest gravitational lens systems ever observed. We have obtained a reconstruction of the cluster Abell 1689 using GRALE, a free-form lens inversion method that relies exclusively on the multiple image data. Non-inclusion of any data related to cluster member galaxies ensures an unbi…