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The Youngest Planet to Have a Spin-Orbit Alignment Measurement AU Mic b
Kane, Stephen R.; Wittenmyer, Robert A.; Gaidos, Eric +21 more
We report measurements of the sky-projected spin-orbit angle for AU Mic b, a Neptune-size planet orbiting a very young (~20 Myr) nearby pre-main-sequence M-dwarf star, which also hosts a bright, edge-on, debris disk. The planet was recently discovered from preliminary analysis of radial-velocity observations and confirmed to be transiting its host…
Coronal Microjets in Quiet-Sun Regions Observed with the Extreme Ultraviolet Imager on Board the Solar Orbiter
Teriaca, Luca; Chen, Yajie; He, Jiansen +8 more
We report the smallest coronal jets ever observed in the quiet Sun with recent high-resolution observations from the High Resolution Telescopes (HRIEUV and HRILyα) of the Extreme Ultraviolet Imager on board the Solar Orbiter (SO). In the HRIEUV (174 Å) images, these microjets usually appear as nearly collimated str…
TOI-1201 b: A mini-Neptune transiting a bright and moderately young M dwarf
Amado, P. J.; Caballero, J. A.; Pallé, E. +63 more
We present the discovery of a transiting mini-Neptune around TOI-1201, a relatively bright and moderately young early M dwarf (J ≈ 9.5 mag, ~600-800 Myr) in an equal-mass ~8 arcsecond-wide binary system, using data from the Transiting Exoplanet Survey Satellite, along with follow-up transit observations. With an orbital period of 2.49 d, TOI-1201 …
The Chandra view of the relation between X-ray and UV emission in quasars
Civano, F.; Elvis, M.; Fabbiano, G. +4 more
We present a study of the relation between X-rays and ultraviolet emission in quasars for a sample of broad-line, radio-quiet objects obtained from the cross-match of the Sloan Digital Sky Survey DR14 with the latest Chandra Source Catalog 2.0 (2332 quasars) and the Chandra COSMOS Legacy survey (273 quasars). The non-linear relation between the ul…
The COMBS Survey - II. Distinguishing the metal-poor bulge from the halo interlopers
Kobayashi, Chiaki; Marino, Anna F.; Hawkins, Keith +9 more
The metal-poor stars in the bulge are important relics of the Milky Way's formation history, as simulations predict that they are some of the oldest stars in the Galaxy. In order to determine if they are truly ancient stars, we must understand their origins. Currently, it is unclear if the metal-poor stars in the bulge ([Fe/H] < -1 dex) are mer…
C18O, 13CO, and 12CO abundances and excitation temperatures in the Orion B molecular cloud. Analysis of the achievable precision in modeling spectral lines within the approximation of the local thermodynamic equilibrium
Peretto, Nicolas; Hughes, Annie; Kainulainen, Jouni +23 more
Context. CO isotopologue transitions are routinely observed in molecular clouds for the purpose of probing the column density of the gas and the elemental ratios of carbon and oxygen, in addition to tracing the kinematics of the environment.
Aims: Our study is aimed at estimating the abundances, excitation temperatures, velocity field, and ve…
Coronal Conditions for the Occurrence of Type II Radio Bursts
Monstein, Christian; Kouloumvakos, Athanasios; Warmuth, Alexander +5 more
Type II radio bursts are generally observed in association with flare-generated or coronal-mass-ejection-driven shock waves. The exact shock and coronal conditions necessary for the production of type II radio emission are still under debate. Shock waves are important for the acceleration of electrons necessary for the generation of the radio emis…
MUSEQuBES: characterizing the circumgalactic medium of redshift ≈3.3 Ly α emitters
Marino, Raffaella Anna; Wendt, Martin; Wisotzki, Lutz +7 more
We present the first characterization of the circumgalactic medium of Ly α emitters (LAEs), using a sample of 96 z ≈ 3.3 LAEs detected with the VLT/MUSE in fields centred on eight bright background quasars. The LAEs have low Ly α luminosities ($\sim 10^{42}\, \text{erg}\, \text{s}^{-1}$) and star formation rates (SFRs) $\sim 1~\text{M}_\odot \, \t…
The VMC Survey - XLII. Near-infrared period-luminosity relations for RR Lyrae stars and the structure of the Large Magellanic Cloud
Clementini, G.; Ripepi, V.; Garofalo, A. +11 more
We present results from an analysis of ~29 000 RR Lyrae stars located in the Large Magellanic Cloud (LMC). For these objects, near-infrared time-series photometry from the VISTA survey of the Magellanic Clouds system (VMC) and optical data from the Optical Gravitational Lensing Experiment (OGLE) IV survey and the Gaia Data Release 2 catalogue of c…
Dust continuum, CO, and [C I] 1 - 0 lines: self-consistent H2 mass estimates and the possibility of globally CO-'dark' galaxies at z = 0.35
Dunne, L.; Gomez, H. L.; Maddox, S. J. +1 more
We present Atacama Large Millimetre Array observations of a small but statistically complete sample of 12 250-µm-selected galaxies at z = 0.35 designed to measure their dust submillimeter continuum emission as well as their $\rm {^{12}CO(1-0)}$ and atomic carbon [C I](3P1-3P0) spectral lines. This …