Search Publications
The Ionizing Spectra of Extremely Metal-poor O Stars: Constraints from the Only H II Region in Leo P
McQuinn, Kristen B. W.; Chisholm, John; Berg, Danielle A. +1 more
Metal-poor, star-forming dwarf galaxies produce extreme nebular emission and likely played a major role in cosmic reionization. Yet, determining their contribution to the high-redshift ionizing photon budget is hampered by the lack of observations constraining the ionizing spectra of individual massive stars more metal-poor than the Magellanic Clo…
Evidence of extended cold molecular gas and dust haloes around z ∼ 2.3 extremely red quasars with ALMA
Maiolino, R.; Carniani, S.; Scholtz, J. +1 more
Large-scale outflows are believed to be an important mechanism in the evolution of galaxies. We can determine the impact of these outflows by studying either current galaxy outflows and their effect in the galaxy or by studying the effect of past outflows on the gas surrounding the galaxy. In this work, we examine the CO(7-6), [C I] ($^{3} \rm P_{…
The geometric albedo of the hot Jupiter HD 189733b measured with CHEOPS
Guterman, P.; Alonso, R.; Deleuil, M. +84 more
Context. Measurements of the occultation of an exoplanet at visible wavelengths allow us to determine the reflective properties of a planetary atmosphere. The observed occultation depth can be translated into a geometric albedo. This in turn aids in characterising the structure and composition of an atmosphere by providing additional information o…
On the Evolution of the Anisotropic Scaling of Magnetohydrodynamic Turbulence in the Inner Heliosphere
Horbury, T. S.; Velli, Marco; Dudok de Wit, Thierry +20 more
We analyze a merged Parker Solar Probe (PSP) and Solar Orbiter (SO) data set covering heliocentric distances 13 R ⊙ ≲ R ≲ 220 R ⊙ to investigate the radial evolution of power and spectral index anisotropy in the wavevector space of solar wind turbulence. Our results show that anisotropic signatures of turbulence display a dis…
A three-component giant radio halo: The puzzling case of the galaxy cluster Abell 2142
Brunetti, G.; Rossetti, M.; De Grandi, S. +16 more
Context. Turbulence introduced into the intracluster medium (ICM) through cluster-merger events transfers energy to non-thermal components, and can trigger the formation of diffuse synchrotron radio sources. Typical diffuse sources in the form of giant radio halos and mini-halos are found in merging and relaxed cool-core galaxy clusters, respectiv…
ESCARGOT: Mapping Vertical Phase Spiral Characteristics Throughout the Real and Simulated Milky Way
Price-Whelan, Adrian M.; Johnston, Kathryn V.; Darragh-Ford, Elise +1 more
The recent discovery of a spiral pattern in the vertical kinematic structure in the solar neighborhood provides a prime opportunity to study nonequilibrium dynamics in the Milky Way from local stellar kinematics. Furthermore, results from simulations indicate that even in a limited volume, differences in stellar orbital histories allow us to trace…
The extremely high albedo of LTT 9779 b revealed by CHEOPS. An ultrahot Neptune with a highly metallic atmosphere
Deleuil, M.; Scandariato, G.; Hoyer, S. +11 more
Context. Optical secondary eclipse measurements of small planets can provide a wealth of information about the reflective properties of these worlds, but the measurements are particularly challenging to attain because of their relatively shallow depth. If such signals can be detected and modeled, however, they can provide planetary albedos, therma…
A Survey for High-redshift Gravitationally Lensed Quasars and Close Quasar Pairs. I. The Discoveries of an Intermediately Lensed Quasar and a Kiloparsec-scale Quasar Pair at z 5
Fan, Xiaohui; Yang, Jinyi; Wang, Feige +1 more
We present the first results from a new survey for high-redshift (z ≳ 5) gravitationally lensed quasars and close quasar pairs. We carry out candidate selection based on the colors and shapes of objects in public imaging surveys, then conduct follow-up observations to confirm the nature of high-priority candidates. In this paper, we report the dis…
First results from the Solar Orbiter Heavy Ion Sensor
Fedorov, A.; Livi, S.; Wurz, P. +30 more
Aims: Solar Orbiter launched in February 2020 with the goal of revealing the connections between the Sun's interior, atmosphere, and the heliosphere. The Solar Orbiter Heavy Ion Sensor (HIS) is a time-of-flight ion mass spectrometer dedicated to measuring heavy ions in the solar wind.
Methods: We present an overview of the first measurem…
Protoplanetary disks in Ks-band total intensity and polarized light
Ren, Bin B.; Ménard, François; Bae, Jaehan +11 more
Context. The diverse morphology among protoplanetary disks may result from planet-disk interactions, suggesting the presence of planets undergoing formation. The characterization of disks can provide information on the formation environments of planets. To date, most imaging campaigns have probed the polarized light from disks, which is only a fra…