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Kepler main-sequence solar-like stars: surface rotation and magnetic-activity evolution
García, Rafael A.; Breton, Sylvain N.; Mathur, Savita +4 more
While the mission's primary goal was focused on exoplanet detection and characterization, Kepler made and continues to make extraordinary advances in stellar physics. Stellar rotation and magnetic activity are no exceptions. Kepler allowed for these properties to be determined for tens of thousands of stars from the main sequence up to the red gia…
The cool brown dwarf Gliese 229 B is a close binary
Lutz, D.; Förster Schreiber, N. M.; Genzel, R. +76 more
Owing to their similarities with giant exoplanets, brown dwarf companions of stars provide insights into the fundamental processes of planet formation and evolution. From their orbits, several brown dwarf companions are found to be more massive than theoretical predictions given their luminosities and the ages of their host stars1–3. Ei…
Constraints on supermassive black hole binaries from JWST and NANOGrav
Loeb, Abraham; Padmanabhan, Hamsa
We use the recent statistics of dual active galactic nuclei (AGN) in the James Webb Space Telescope (JWST) data at z ∼ 3.4 to address two aspects of the feedback and evolution scenarios of supermassive black hole binaries. We find that the JWST data provide evidence for the members of a binary BH being `lit' at the same time, rather than independe…
JWST COMPASS: The 3–5 µm Transmission Spectrum of the Super-Earth L 98-59 c
Batalha, Natalie M.; Moran, Sarah E.; Kirk, James +14 more
We present a JWST Near-InfraRed Spectrograph (NIRSpec) transmission spectrum of the super-Earth exoplanet L 98-59 c. This small (R p = 1.385 ± 0.085R ⊕, M p = 2.22 ± 0.26 R ⊕), warm (T eq = 553 K) planet resides in a multiplanet system around a nearby, bright (J = 7.933) M3V star. We find …
Determining stellar accretion rates from Paα and Brβ emission lines with JWST NIRSpec. Accretion of pre-main-sequence stars in NGC 3603
de Marchi, Guido; Brandl, Bernhard; Rogers, Ciarán
In this Letter, we present the first systematic spectroscopic measurements of the near-infrared (NIR) hydrogen recombination lines Paschen alpha (Paαλ = 1.875 µm) and Brackett beta (Brβλ = 2.626 µm), produced by pre-main-sequence (PMS) stars. Such stars include T Tauri and Herbig AeBe stars, located in the massive…
Clues to growth and disruption of two neighbouring spiral arms of the Milky Way
Matsunaga, Noriyuki; Kawata, Daisuke; Taniguchi, Daisuke +3 more
Studying the nature of spiral arms is essential for understanding the formation of the intricate disc structure of the Milky Way. The European Space Agency's Gaia mission has provided revolutionary observational data that have uncovered detailed kinematical features of stars in the Milky Way. However, so far the nature of spiral arms continues to …
Exploring the Gas-phase Metallicity Gradients of Star-forming Galaxies at Cosmic Noon
Cleri, Nikko J.; Giavalisco, Mauro; Ji, Zhiyuan +3 more
We explore the relationships between the [O/H] gas-phase metallicity radial gradients and multiple galaxy properties for 238 star-forming galaxies at 0.6 < z < 2.6 selected from the CANDELS Lyα Emission at Reionization survey with stellar mass $8.5\lt \mathrm{log}\,{M}_{* }/{M}_{\odot }\lt 10.5$ . The gradients cover the range from ‑0.11 to …
CHEX-MATE: A LOFAR pilot X-ray - radio study on five radio halo clusters
Brunetti, G.; Pointecouteau, E.; Pratt, G. W. +24 more
The connection between the thermal and non-thermal properties in galaxy clusters hosting radio halos seems fairly well established. However, a comprehensive analysis of such a connection has only been done for integrated quantities (e.g. LX − Pradio relation). In recent years, new-generation radio telescopes have enabled the …
VaTEST III: Validation of eight potential super-earths from TESS data
Barclay, Thomas; Tan, Thiam-Guan; Schlieder, Joshua E. +39 more
NASA's all-sky survey mission, the Transiting Exoplanet Survey Satellite (TESS), is specifically engineered to detect exoplanets that transit bright stars. Thus far, TESS has successfully identified approximately 400 transiting exoplanets, in addition to roughly 6 000 candidate exoplanets pending confirmation. In this study, we present the results…
The Massive and Distant Clusters of WISE Survey 2: Equatorial First Data Release
Connor, Thomas; Gonzalez, Anthony H.; Stanford, S. A. +7 more
The Massive and Distant Clusters of WISE Survey 2 (MaDCoWS2) is a new survey designed as the successor of the original MaDCoWS survey. MaDCoWS2 improves upon its predecessor by using deeper optical and infrared data and a more powerful detection algorithm (PZWav). As input to the search, we use grz photometry from the DECam Legacy Survey (DECaLS) …