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ESPRESSO Observations of Gaia BH1: High-precision Orbital Constraints and no Evidence for an Inner Binary
Triaud, Amaury H. M. J.; Bieryla, Allyson; Rix, Hans-Walter +9 more
We present high-precision radial velocity observations of Gaia BH1, the nearest known black hole (BH). The system contains a solar-type G star orbiting a massive dark companion, which could be either a single BH or an inner BH + BH binary. A BH + BH binary is expected in some models where Gaia BH1 formed as a hierarchical triple, which is attracti…
At least one in a dozen stars shows evidence of planetary ingestion
Bitsch, Bertram; Ting, Yuan-Sen; Dotter, Aaron +6 more
Stellar chemical compositions can be altered by ingestion of planetary material1,2 and/or planet formation, which removes refractory material from the protostellar disk3,4. These `planet signatures' appear as correlations between elemental abundance differences and the dust condensation temperature3,5,6. Detecting …
Enhanced star formation and metallicity deficit in the USS 1558-003 forming protocluster at z = 2.53
Tanaka, I.; Daikuhara, K.; Koyama, Y. +6 more
We use K-band multi-object near-infrared spectroscopy with Keck/MOSFIRE to search for environmental imprints on the gas properties of 27 narrow-band selected H α emitters (HAEs) across the three major clumps of the assembling USS1558-003 protocluster at z = 2.53. We target the H α and [N II]λ6584 emission lines to obtain star formation rates (SFR)…
Adding value to JWST spectra and photometry: stellar population and star formation properties of spectroscopically confirmed JADES and CEERS galaxies at z > 7
Conselice, Christopher J.; Li, Qiong; Adams, Nathan +5 more
In this paper, we discuss measurements of the stellar population and star-forming properties for 43 spectroscopically confirmed publicly available high-redshift z > 7 JWST galaxies in the JADES and CEERS observational programs. We carry out a thorough study investigating the relationship between spectroscopic features and photometrically derive…
Strong outflows and inefficient star formation in the reionization-era ultrafaint dwarf galaxy Eridanus II
Weisz, Daniel R.; Weinberg, David H.; Fu, Sal Wanying +1 more
We present novel constraints on the underlying galaxy formation physics (e.g. mass-loading factor, star formation history, and metal retention) at z ≳ 7 for the low-mass (M* ~ 105 M⊙) Local Group ultrafaint dwarf galaxy (UFD) Eridanus II (Eri II). Using a hierarchical Bayesian framework, we apply a one-zone chemica…
CARMENES input catalog of M dwarfs. VII. New rotation periods for the survey stars and their correlations with stellar activity
Nagel, E.; Amado, P. J.; Caballero, J. A. +40 more
Aims: Knowledge of rotation periods (Prot) is important for understanding the magnetic activity and angular momentum evolution of late-type stars, as well as for evaluating radial velocity signals of potential exoplanets and identifying false positives. We measured photometric and spectroscopic Prot for a large sample of…
EPOCHS IX. When cosmic dawn breaks: evidence for evolved stellar populations in 7 < z < 12 galaxies from PEARLS GTO and public NIRCam imaging
Grogin, Norman A.; Pirzkal, Nor; Wilkins, Stephen M. +28 more
The presence of evolved stars in high-redshift galaxies can place valuable indirect constraints on the onset of star formation in the Universe. Thus, we use PEARLS GTO (Prime Extragalactic Areas for Reionization and Lensing Science Guaranteed Time Observations) and public NIRCam (Near Infrared Camera) photometric data to search for Balmer-break ca…
The Next Generation Deep Extragalactic Exploratory Public Near-infrared Slitless Survey Epoch 1 (NGDEEP-NISS1): Extragalactic Star-formation and Active Galactic Nuclei at 0.5 < z < 3.6
Papovich, Casey; Finkelstein, Steven L.; Pérez-González, Pablo G. +48 more
The Next Generation Deep Extragalactic Exploratory Public (NGDEEP) survey program was designed specifically to include Near Infrared Slitless Spectroscopic observations (NGDEEP-NISS) to detect multiple emission lines in as many galaxies as possible and across a wide redshift range using the Near Infrared Imager and Slitless Spectrograph. We presen…
NICER Discovery that SRGA J144459.2–604207 Is an Accreting Millisecond X-Ray Pulsar
Chakrabarty, Deepto; Ray, Paul S.; Wolff, Michael T. +17 more
We present the discovery, with the Neutron Star Interior Composition Explorer (NICER), that SRGA J144459.2‑604207 is a 447.9 Hz accreting millisecond X-ray pulsar (AMXP), which underwent a 4 week long outburst starting on 2024 February 15. The AMXP resides in a 5.22 hr binary, orbiting a low-mass companion donor with M d > 0.1 M
Spectral Calculations of 3D Radiation Magnetohydrodynamic Simulations of Super-Eddington Accretion onto a Stellar-mass Black Hole
Middleton, Matthew J.; Mills, Brianna S.; Davis, Shane W. +1 more
We use the Athena++ Monte Carlo (MC) radiation transfer module to postprocess simulation snapshots from nonrelativistic Athena++ radiation magnetohydrodynamic (RMHD) simulations. These simulations were run using a gray (frequency-integrated) approach but were also restarted and ran with a multigroup approach that accounts for Compton scattering wi…