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The Planetary Theory of Solar Activity Variability: A Review
Scafetta, Nicola; Bianchini, Antonio
Commenting the 11-year sunspot cycle, Wolf (1859, MNRAS 19, 85–86) conjectured that "the variations of spot-frequency depend on the influences of Venus, Earth, Jupiter, and Saturn." The high synchronization of our planetary system is already nicely revealed by the fact that the ratios of the planetary orbital radii are closely related to each othe…
Massive Compact Dust Disk with a Gap around CW Tau Revealed by ALMA Multiband Observations
Kataoka, Akimasa; Tsukagoshi, Takashi; Ueda, Takahiro
Compact protoplanetary disks with a radius of ≲50 au are common around young low-mass stars. We report high-resolution ALMA dust continuum observations toward a compact disk around CW Tau at Bands 4 (λ = 2.2 mm), 6 (1.3 mm), 7 (0.89 mm), and 8 (0.75 mm). The spectral energy distribution shows the spectral slope of 2.0 ± 0.24 between 0.75 and 1.3 m…
A Mirage or an Oasis? Water Vapor in the Atmosphere of the Warm Neptune TOI-674 b
Fortney, Jonathan J.; Mikal-Evans, Thomas; Lothringer, Joshua D. +14 more
We report observations of the recently discovered warm Neptune TOI-674 b (5.25 R ⊕, 23.6 M ⊕) with the Hubble Space Telescope's Wide Field Camera 3 instrument. TOI-674 b is in the Neptune desert, an observed paucity of Neptune-size exoplanets at short orbital periods. Planets in the desert are thought to have complex evolutio…
X-ray studies of the Abell 3158 galaxy cluster with eROSITA
Pacaud, F.; Ramos-Ceja, M. E.; Bulbul, E. +13 more
Context. The most nearby clusters are the best places for studying physical and enrichment effects in the faint cluster outskirts. The Abell 3158 cluster (A3158), located at z = 0.059, is quite extended with a characteristic radius r200 = 23.95 arcmin. The metal distribution in the outskirts of this cluster has previously been studied w…
Stellar population of the Rosette Nebula and NGC 2244. Application of the probabilistic random forest
Peña Ramírez, K.; Bouy, H.; Krone-Martins, A. +5 more
Context. Measurements of internal dynamics of young clusters and star-forming regions are crucial to fully understand the process of their formation. A basic prerequisite for this is a well-established and robust list of probable members.
Aims: In this work, we study the 2.8° ×2.6° region in the emblematic Rosette Nebula, centred in the young…
Flares and rotation of M dwarfs with habitable zones accessible to TESS planet detections
Stelzer, B.; Raetz, St.; Magaudda, E. +1 more
Context. More than 4000 exoplanets have been discovered to date, providing the search for a place capable of hosting life with a large number of targets. With the Transiting Exoplanet Survey Satellite (TESS) having completed its primary mission in July 2020, the number of planets confirmed by follow-up observations is growing further. Crucial for …
A 30 kpc Spatially Extended Clumpy and Asymmetric Galactic Outflow at z 1.7
Chisholm, John; Tejos, Nicolas; Rigby, Jane R. +10 more
We image the spatial extent of a cool galactic outflow with fine-structure Fe II* emission and resonant Mg II emission in a gravitationally lensed star-forming galaxy at z = 1.70347. The Fe II* and Mg II (continuum-subtracted) emissions span out to radial distances of ~14.33 and 26.5 kpc, respectively, with maximum spatial extents of ~21 kpc for F…
Discovery of One Neutron Star Candidate from Radial-velocity Monitoring
Liu, Jifeng; Zhang, Haotong; Wang, Song +8 more
We report the discovery of one possible neutron star binary (P orb = 0.8666 days) by using LAMOST low-resolution spectroscopic data. The visible companion is a late A-type dwarf (T eff = 7900 ± 200 K; logg = 4.3 ± 0.2; M = 1.7 ± 0.1 M ⊙; R = 1.7 ± 0.2 R ⊙) at a distance of 1.11 ± 0.03 kpc. No double-line…
UOCS -VIII. UV study of the open cluster NGC 2506 using ASTROSAT★
Subramaniam, Annapurni; Panthi, Anju; Vaidya, Kaushar +4 more
We study an intermediate-age open cluster (OC) NGC 2506 using the ASTROSAT/UVIT data and other archival data. We identified 2175 cluster members using a machine learning-based algorithm, ML-MOC, on Gaia EDR3 data. Among the cluster members detected in UVIT filters, F148W, F154W, and F169M, we detect nine blue straggler stars (BSS), three yellow st…
Hard-X-ray-selected active galactic nuclei - II. Spectral energy distributions in the 5-45 GHz domain
Laor, Ari; Behar, Ehud; Baldi, Ranieri D. +7 more
A wide-frequency radio study of active galactic nuclei (AGN) is crucial to evaluate the intervening radiative mechanisms responsible for the observed emission and relate them with the underlying accretion physics. We present wide-frequency (5-45 GHz), high-sensitivity (few $\mathrm{{\mu }Jy\, beam^{-1}}$), (sub)-kpc Jansky Very Large Array (JVLA) …