Search Publications
Missions
Journals
Publication Years
Physical conditions in the diffuse interstellar medium of local and high-redshift galaxies: measurements based on the excitation of H2 rotational and C I fine-structure levels
Balashev, S. A.; Klimenko, V. V.
We present the results of an analysis of the physical conditions (number density, intensity of UV field, kinetic temperature) in the cold H2-bearing interstellar medium of local and high-redshift galaxies. Our measurements are based on the fit to the observed population of H2 rotational levels and C I fine-structure levels wi…
Constraining the depth of the winds on Uranus and Neptune via Ohmic dissipation
Helled, Ravit; Soyuer, Deniz; Soubiran, François
Determining the depth of atmospheric winds in the outer planets of the Solar system is a key topic in planetary science. We provide constraints on these depths in Uranus and Neptune via the total induced Ohmic dissipation, due to the interaction of the zonal flows and the planetary magnetic fields. An upper bound can be placed on the induced dissi…
Directly comparing coronal and solar wind elemental fractionation
Owen, C. J.; Baker, D.; Brooks, D. H. +1 more
Context. As the solar wind propagates through the heliosphere, dynamical processes irreversibly erase the signatures of the near-Sun heating and acceleration processes. The elemental fractionation of the solar wind should not change during transit, however, making it an ideal tracer of these processes.
Aims: We aim to verify directly if the s…
The structure and characteristic scales of molecular clouds
Arzoumanian, Doris; Elia, Davide; Heyer, Mark +8 more
The structure of molecular clouds holds important clues regarding the physical processes that lead to their formation and subsequent dynamical evolution. While it is well established that turbulence imprints a self-similar structure onto the clouds, other processes, such as gravity and stellar feedback, can break their scale-free nature. The break…
A period-dependent spatial scatter of Galactic black hole transients
Maccarone, T. J.; Charles, P. A.; Gandhi, P. +4 more
There remain significant uncertainties in the origin and evolution of black holes in binary systems, in particular regarding their birth sites and the influence of natal kicks. These are long-standing issues, but their debate has been reinvigorated in the era of gravitational wave detections and the improving precision of astrometric measurements.…
An ablating 2.6 M⊕ planet in an eccentric binary from the Dispersed Matter Planet Project
Jenkins, James S.; Anglada-Escudé, Guillem; Díaz, Matías R. +8 more
Earth-mass exoplanets are difficult to detect. The Dispersed Matter Planet Project (DMPP) identifies stars that are likely to host the most detectable low-mass exoplanets. The star DMPP-3 (HD 42936) shows signs of circumstellar absorption, indicative of mass loss from ablating planets. Here, we report the radial velocity discovery of a highly ecce…
The R-Process Alliance: A Very Metal-poor, Extremely r-process-enhanced Star with [Eu/Fe] = + 2.2, and the Class of r-III Stars
Beers, Timothy C.; Placco, Vinicius M.; Hattori, Kohei +8 more
We report the discovery of J1521-3538, a bright (V = 12.2), very metal-poor ([Fe/H] = -2.8) strongly r-process-enhanced field horizontal branch star, based on a high-resolution, high signal-to-noise Magellan/MIKE spectrum. J1521-3538 shows the largest r-process element overabundance in any known r-process-enhanced star, with [Eu/Fe] = +2.2, and it…
Astrometric effects of gravitational wave backgrounds with nonluminal propagation speeds
Gilmore, Gerard; Mihaylov, Deyan P.; Moore, Christopher J. +2 more
A passing gravitational wave causes a deflection in the apparent astrometric positions of distant stars. The effect of the speed of the gravitational wave on this astrometric shift is discussed. A stochastic background of gravitational waves would result in a pattern of astrometric deflections which are correlated on large angular scales. These co…
Sixteen overlooked open clusters in the fourth Galactic quadrant. A combined analysis of UBVI photometry and Gaia DR2 with ASteCA
Moitinho, A.; Carraro, G.; Perren, G. I. +3 more
Aims: This paper has two main objectives: (1) To determine the intrinsic properties of 16 faint and mostly unstudied open clusters in the poorly known sector of the Galaxy at 270° -300° to probe the Milky Way structure in future investigations. (2) To address previously reported systematics in Gaia DR2 parallaxes by comparing the cluster dist…
The Accretion History of AGN: A Newly Defined Population of Cold Quasars
Kartaltepe, Jeyhan S.; Kirkpatrick, Allison; Marchesi, Stefano +15 more
Quasars are the most luminous of active galactic nuclei, and are perhaps responsible for quenching star formation in their hosts. The Stripe 82X catalog covers 31.3 deg2 of the Stripe 82 field, of which the 15.6 deg2 covered with XMM-Newton is also covered by Herschel/SPIRE. We have 2500 X-ray detected sources with multiwavel…