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The population of young low-mass stars in Trumpler 14
Testi, Leonardo; Reiter, Megan; Hennebelle, Patrick +8 more
Massive star-forming regions are thought to be the most common birth environments in the Galaxy and the only birth places of very massive stars. Their presence in the stellar cluster alters the conditions within the cluster, impacting at the same time the evolution of other cluster members. In principle, copious amounts of ultraviolet radiation pr…
Nano-Newton electrostatic force actuators for femto-Newton-sensitive measurements: System performance test in the LISA Pathfinder mission
Mendes, L.; Russano, G.; Nofrarias, M. +89 more
Electrostatic force actuation is a key component of the system of geodesic reference test masses (TM) for the LISA orbiting gravitational wave observatory and in particular for performance at low frequencies, below 1 mHz, where the observatory sensitivity is limited by stray force noise. The system needs to apply forces of order 10-9 N …
A complex node of the cosmic web associated with the massive galaxy cluster MACS J0600.1-2008
Koekemoer, Anton M.; Mahler, Guillaume; Richard, Johan +18 more
MACS J0600.1-2008 (MACS0600) is an X-ray-luminous, massive galaxy cluster at $z_{\mathrm{d}}=0.43$, studied previously by the REionization LensIng Cluster Survey and ALMA Lensing Cluster Survey projects which revealed a complex, bimodal mass distribution and an intriguing high-redshift object behind it. Here, we report on the results of a combined…
Physical properties of strong 1 < z < 3 Balmer and Paschen line emitters observed with JWST
Kartaltepe, J. S.; Dickinson, M.; Finkelstein, S. L. +22 more
Context. The ultraviolet continuum traces young stars while the near-infrared unveils older stellar populations and dust-obscured regions. Balmer emission lines provide insights into gas properties and young stellar objects but are highly affected by dust attenuation. The near-infrared Paschen lines suffer less dust attenuation and can be used to …
TOI-4641b: an aligned warm Jupiter orbiting a bright (V=7.5) rapidly rotating F-star
Barclay, Thomas; Bieryla, Allyson; Latham, David W. +25 more
We report the discovery of TOI-4641b, a warm Jupiter transiting a rapidly rotating F-type star with a stellar effective temperature of 6560 K. The planet has a radius of 0.73 RJup, a mass smaller than 3.87 MJup(3σ), and a period of 22.09 d. It is orbiting a bright star (V=7.5 mag) on a circular orbit with a radius and mass of…
Observational Overview of the May 2024 G5-Level Geomagnetic Storm: From Solar Eruptions to Terrestrial Consequences
Park, Sung-Hong; Lim, Eun-Kyung; Kim, Sujin +25 more
This study reports comprehensive observations for the G5-level geomagnetic storm that occurred from May 10 to 12, 2024, the most intense event since the 2003 Halloween storm. The storm was triggered by a series of coronal mass ejections (CMEs) originating from the merging of two active regions 13664/13668, which formed a large and complex photosph…
Metis Observation of the Onset of Fully Developed Turbulence in the Solar Corona
Telloni, Daniele; Zank, Gary P.; Adhikari, Laxman +70 more
This Letter reports the first observation of the onset of fully developed turbulence in the solar corona. Long time series of white-light coronal images, acquired by Metis aboard Solar Orbiter at 2 minutes cadence and spanning about 10 hr, were studied to gain insight into the statistical properties of fluctuations in the density of the coronal pl…
Period-luminosity and period-luminosity-metallicity relations for Galactic RR Lyrae stars in the Sloan bands
Narloch, W.; Gieren, W.; Pietrzyński, G. +6 more
Context. RR Lyrae stars are excellent tracers of the old population II due to their period-luminosity (PL) and period-luminosity-metallicity (PLZ) relations. While these relations have been investigated in detail in many photometric bands, there are few comprehensive studies about them in Sloan-like systems. Aims. We present PL and PLZ relations (…
Constraining the formation of WASP-39b using JWST transit spectroscopy
Waters, L. B. F. M.; Min, M.; Khorshid, N. +1 more
Context. Understanding the formation history of planets is one of the goals of studying exoplanet atmospheres. The atmospheric composition of planets can provide insights into the formation pathways of planets. Even though the mapping of the atmospheric composition onto a formation pathway is not unambiguous, with the increasing sensitivity of mod…
Accurate, Precise, and Physically Self-consistent Ages and Metallicities for 400,000 Solar Neighborhood Subgiant Branch Stars
Reggiani, Henrique; Schlaufman, Kevin C.; Nataf, David M. +1 more
Age is the most difficult fundamental stellar parameter to infer for isolated stars. While isochrone-based ages are in general imprecise for both main-sequence dwarfs and red giants, precise isochrone-based ages can be obtained for stars on the subgiant branch transitioning from core to shell hydrogen burning. We synthesize Gaia Data Release 3–bas…