Search Publications
DESI Observations of the Andromeda Galaxy: Revealing the Immigration History of Our Nearest Neighbor
García-Bellido, Juan; Bell, Eric F.; Moustakas, J. +45 more
We present Dark Energy Spectroscopic Instrument (DESI) observations of the inner halo of M31, which reveal the kinematics of a recent merger-a galactic immigration event-in exquisite detail. Of the 11,416 sources studied in 3.75 hr of on-sky exposure time, 7438 are M31 sources with well-measured radial velocities. The observations reveal intricate…
The occurrence rate of giant planets orbiting low-mass stars with TESS
Bayliss, Daniel; Van Eylen, Vincent; Bryant, Edward M.
We present a systematic search for transiting giant planets ($0.6 \mbox{$R_{\rm J}$}\le \mbox{$R_{\rm P}$}\le 2.0 \mbox{$R_{\rm J}$}$) orbiting nearby low-mass stars ($\mbox{$M_{*}$}\le 0.71 \mbox{${\rm M}_{\odot }$}$). The formation of giant planets around low-mass stars is predicted to be rare by the core-accretion planet formation theory. We se…
Breakdown of the Newton-Einstein Standard Gravity at Low Acceleration in Internal Dynamics of Wide Binary Stars
Chae, Kyu-Hyun
A gravitational anomaly is found at weak gravitational acceleration g N ≲ 10-9 m s-2 from analyses of the dynamics of wide binary stars selected from the Gaia DR3 database that have accurate distances, proper motions, and reliably inferred stellar masses. Implicit high-order multiplicities are required and the mult…
JWST-TST DREAMS: Quartz Clouds in the Atmosphere of WASP-17b
Ranjan, Sukrit; Anderson, Jay; Stevenson, Kevin B. +39 more
Clouds are prevalent in many of the exoplanet atmospheres that have been observed to date. For transiting exoplanets, we know if clouds are present because they mute spectral features and cause wavelength-dependent scattering. While the exact composition of these clouds is largely unknown, this information is vital to understanding the chemistry a…
JWST's PEARLS: A new lens model for ACT-CL J0102−4915, "El Gordo," and the first red supergiant star at cosmological distances discovered by JWST
Ryan, R. E.; Diego, J. M.; Zitrin, A. +29 more
The first James Webb Space Telescope (JWST) data on the massive colliding cluster
Primordial black hole constraints with Hawking radiation-A review
Auffinger, Jérémy
Primordial black holes are under intense scrutiny since the detection of gravitational waves from mergers of Solar-mass black holes in 2015. More recently, the development of numerical tools and the precision observational data have rekindled the effort to constrain the black hole abundance in the lower mass range, that is M < 1023 g…
Gamma-ray bursts, quasars, baryonic acoustic oscillations, and supernovae Ia: new statistical insights and cosmological constraints
Nagataki, S.; Bargiacchi, G.; Capozziello, S. +1 more
The recent $\sim 4 \, \sigma$ Hubble constant, H0, tension is observed between the value of H0 from the cosmic microwave background (CMB) and Type Ia supernovae (SNe Ia). It is a decade since this tension is excruciating the modern astrophysical community. To shed light on this problem is key to consider probes at intermediat…
Uncovering the geometry of the hot X-ray corona in the Seyfert galaxy NGC 4151 with IXPE
Antonelli, L. A.; Costa, E.; Bianchi, S. +106 more
We present an X-ray spectropolarimetric analysis of the bright Seyfert galaxy NGC 4151. The source has been observed with the Imaging X-ray Polarimetry Explorer (IXPE) for 700 ks, complemented with simultaneous XMM-Newton (50 ks) and NuSTAR (100 ks) pointings. A polarization degree Π = 4.9 ± 1.1 per cent and angle Ψ = 86° ± 7° east of north (68 pe…
PHANGS-JWST First Results: A Statistical View on Bubble Evolution in NGC 628
Henshaw, Jonathan D.; Kruijssen, J. M. Diederik; Leroy, Adam K. +50 more
The first JWST observations of nearby galaxies have unveiled a rich population of bubbles that trace the stellar-feedback mechanisms responsible for their creation. Studying these bubbles therefore allows us to chart the interaction between stellar feedback and the interstellar medium, and the larger galactic flows needed to regulate star formatio…
The production of ionizing photons in UV-faint z ∼ 3-7 galaxies
Calabrò, Antonello; Castellano, Marco; Pentericci, Laura +20 more
Aims: The demographics of the production and escape of ionizing photons from UV-faint early galaxies is a key unknown that has hindered attempts to discover the primary drivers of reionization. With the advent of JWST, it is finally possible to observe the rest-frame optical nebular emission from individual sub-L*z > 3 galaxies …