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Determining the Beaming of Io Decametric Emissions: A Remote Diagnostic to Probe the Io-Jupiter Interaction
Kurth, W. S.; Cecconi, B.; Lamy, L. +8 more
We investigate the beaming of 11 Io-Jupiter decametric (Io-DAM) emissions observed by Juno/Waves, the Nançay Decameter Array, and NenuFAR. Using an up-to-date magnetic field model and three methods to position the active Io Flux Tube (IFT), we accurately locate the radiosources and determine their emission angle θ from the local magnetic field vec…
Prevalence of Thermal Nonequilibrium over an Active Region
Antolin, Patrick; Şahin, Seray
Recent observations have shown that besides the characteristic multimillion degree component, the corona also contains a large amount of cool material called coronal rain, whose clumps are 10-100 times cooler and denser than the surroundings and are often organized in larger events, termed showers. Thermal instability (TI) within a coronal loop in…
Dynamical Star-forming History of Per OB2
Stassun, Keivan G.; Kounkel, Marina; Deng, TingYan
We analyze the internal dynamics of young stars toward Perseus using Gaia EDR3 data, including Per OB2 and California Cloud. Interpreting the current dynamics, we speculate that Per OB2 may have formed from two separate clouds that have begun forming stars in close proximity to each other. IC 348 is caught in the middle between the two of them, in…
TOI-1670 b and c: An Inner Sub-Neptune with an Outer Warm Jupiter Unlikely to Have Originated from High-eccentricity Migration
Latham, David W.; Quinn, Samuel N.; Cochran, William D. +38 more
We report the discovery of two transiting planets around the bright (V = 9.9 mag) main-sequence F7 star TOI-1670 by the Transiting Exoplanet Survey Satellite. TOI-1670 b is a sub-Neptune ( ${R}_{{\rm{b}}}={2.06}_{-0.15}^{+0.19}$ R ⊕) on a 10.9 day orbit, and TOI-1670 c is a warm Jupiter ( ${R}_{{\rm{c}}}={0.987}_{-0.025}^{+0.025}$ R
Herschel-ATLAS Data Release III: near-infrared counterparts in the South Galactic Pole field - another 100 000 submillimetre galaxies
Ivison, R. J.; Negrello, M.; Dunne, L. +6 more
In this paper, we present the third data release (DR3) of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS). We identify likely near-infrared counterparts to submillimetre sources in the South Galactic Pole (SGP) field using the VISTA VIKING survey. We search for the most probable counterparts within 15 arcsec of each Herschel sourc…
X-ray variability of HD 189733 across eight years of XMM-Newton observations
Micela, G.; Sciortino, S.; Pillitteri, I. +2 more
The characterization of exoplanets, their formation, evolution, and chemical changes is tightly linked to our knowledge of their host stars. In particular, stellar X-rays and UV emission have a strong impact on the dynamical and chemical evolution of planetary atmospheres. We analyzed 25 XMM-Newton observations encompassing about eight years and t…
The Pristine Inner Galaxy Survey (PIGS) - IV. A photometric metallicity analysis of the Sagittarius dwarf spheroidal galaxy
Lewis, Geraint F.; Buder, Sven; Zucker, Daniel B. +15 more
We present a comprehensive metallicity analysis of the Sagittarius dwarf spheroidal galaxy (Sgr dSph) using Pristine CaHK photometry. We base our member selection on Gaia EDR3 astrometry, applying a magnitude limit at G0 = 17.3, and our population study on the metallicity-sensitive photometry from the Pristine Inner Galaxy Survey (PIGS)…
The peculiar spectral evolution of the new X-ray transient MAXI J0637-430
Huang, Y.; Zhang, S.; Soria, R. +15 more
We studied the transient Galactic black hole candidate MAXI J0637-430 with data from Insight-HXMT, Swift, and XMM-Newton. The broad-band X-ray observations from Insight-HXMT help us constrain the power-law component. MAXI J0637-430 is located at unusually high Galactic latitude; if it belongs to the Galactic thick disc, we suggest a most likely di…
Warm Absorbers in the Radiation-driven Fountain Model of Low-mass Active Galactic Nuclei
Wada, Keiichi; Ueda, Yoshihiro; Mizumoto, Misaki +1 more
To investigate the origins of the warm absorbers in active galactic nuclei (AGNs), we study the ionization-state structure of the radiation-driven fountain model in a low-mass AGN and calculate the predicted X-ray spectra utilizing the spectral synthesis code Cloudy. The spectra show many absorption and emission line features originating in the ou…
Hubble Space Telescope Detection of the Nucleus of Comet C/2014 UN271 (Bernardinelli-Bernstein)
Jewitt, David; Mutchler, Max J.; Hui, Man-To +1 more
We present a high-resolution observation of the distant comet C/2014 UN271 (Bernardinelli-Bernstein) using the Hubble Space Telescope on 2022 January 8. The signal of the nucleus was successfully isolated by means of a nucleus extraction technique, with an apparent V-band magnitude measured to be 21.65 ± 0.11, corresponding to an absolu…