Search Publications
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…
Dynamical masses across the Hertzsprung-Russell diagram
Ting, Yuan-Sen; Cheng, Sihao; Speagle, Joshua S. +1 more
We infer the dynamical masses of stars across the Hertzsprung-Russell (H-R) diagram using wide binaries from the Gaia survey. Gaia's high-precision astrometry measures the wide binaries' orbital motion, which contains the mass information. Using wide binaries as the training sample, we measure the mass of stars across the 2D H-R diagram using the …
Velocity-space Signatures of Resonant Energy Transfer between Whistler Waves and Electrons in the Earth's Magnetosheath
Verscharen, Daniel; Klein, Kristopher G.; Li, Hui +4 more
Wave-particle interactions play a crucial role in transferring energy between electromagnetic fields and charged particles in space and astrophysical plasmas. Despite the prevalence of different electromagnetic waves in space, there is still a lack of understanding of fundamental aspects of wave-particle interactions, particularly in terms of ener…
High-resolution X-Ray Spectroscopy of Interstellar Iron toward Cygnus X-1 and GX 339-4
Lee, Julia C.; Paerels, Frits; Gatuzz, Efrain +7 more
We present a high-resolution spectral study of Fe L-shell extinction by the diffuse interstellar medium (ISM) in the direction of the X-ray binaries Cygnus X-1 and GX 339–4, using the XMM-Newton reflection grating spectrometer. The majority of interstellar Fe is suspected to condense into dust grains in the diffuse ISM, but the compounds formed fr…