Search Publications
Missions
Journals
Publication Years
In-flight calibration of the Insight-Hard X-ray Modulation Telescope
Zhang, Shu; Li, Xiaobo; Tuo, Youli +19 more
We present the calibration of the Insight-Hard X-ray Modulation Telescope (Insight-HXMT) X-ray satellite, which can be used to perform timing and spectral studies of bright X-ray sources. Insight-HXMT carries three main payloads onboard: the High Energy X-ray telescope (HE), the Medium Energy X-ray telescope (ME) and the low Energy X-ray telescope…
Evidence for a vast prograde stellar stream in the solar vicinity
Hopkins, Philip F.; Sanderson, Robyn; Wetzel, Andrew +6 more
Massive dwarf galaxies that merge with the Milky Way on prograde orbits can be dragged into the disk plane before being completely disrupted. Such mergers can contribute to an accreted stellar disk and a dark matter disk. Here we present Nyx, a vast stellar stream in the vicinity of the Sun, which provides the first indication that such an event o…
The carbon monoxide-rich interstellar comet 2I/Borisov
Feldman, P. D.; Bodewits, D.; Noonan, J. W. +7 more
Interstellar comets offer direct samples of volatiles from distant protoplanetary disks. 2I/Borisov is the first notably active interstellar comet discovered in our Solar System1. Comets are condensed samples of the gas, ice and dust that were in a star's protoplanetary disk during the formation of its planets, and inform our understand…
A low-mass planet candidate orbiting Proxima Centauri at a distance of 1.5 AU
Butler, R. Paul; Jenkins, James S.; Anglada-Escudé, Guillem +18 more
Our nearest neighbor, Proxima Centauri, hosts a temperate terrestrial planet. We detected in radial velocities evidence of a possible second planet with minimum mass mc sin ic = 5.8 ± 1.9 M⊕ and orbital period Pc = 5.21+0.26-0.22 years. The analysis of photometric data and spectrosc…
ARES I: WASP-76 b, A Tale of Two HST Spectra
Drossart, Pierre; Blain, Doriann; Beaulieu, Jean-Philippe +25 more
We analyze the transmission and emission spectra of the ultra-hot Jupiter WASP-76 b, observed with the G141 grism of the Hubble Space Telescope's (HST) Wide Field Camera 3 (WFC3). We reduce and fit the raw data for each observation using the open-source software Iraclis before performing a fully Bayesian retrieval using the publicly available anal…
The Herschel view of the dense core population in the Ophiuchus molecular cloud
André, Ph.; Arzoumanian, D.; Könyves, V. +15 more
Context. Herschel observations of nearby clouds in the Gould Belt support a paradigm for low-mass star formation, starting with the generation of molecular filaments, followed by filament fragmentation, and the concentration of mass into self-gravitating prestellar cores. In the case of the Ophiuchus molecular complex, a rich star formation activi…
Perpendicular Transport of Energetic Particles in Magnetic Turbulence
Shalchi, Andreas
Scientists have explored how energetic particles such as solar energetic particles and cosmic rays move through a magnetized plasma such as the interplanetary and interstellar medium since more than five decades. From a theoretical point of view, this topic is difficult because the particles experience complicated interactions with turbulent magne…
The Pristine Inner Galaxy Survey (PIGS) I: tracing the kinematics of metal-poor stars in the Galactic bulge
Schultheis, M.; Lardo, C.; Sestito, F. +20 more
Our Galaxy is known to contain a central boxy/peanut-shaped bulge, yet the importance of a classical, pressure-supported component within the central part of the Milky Way is still being debated. It should be most visible at low metallicity, a regime that has not yet been studied in detail. Using metallicity-sensitive narrow-band photometry, the P…
Identical or fraternal twins? The chemical homogeneity of wide binaries from Gaia DR2
Ting, Yuan-Sen; Hawkins, Keith; Lucey, Madeline +7 more
One of the high-level goals of Galactic archaeology is chemical tagging of stars across the Milky Way to piece together its assembly history. For this to work, stars born together must be uniquely chemically homogeneous. Wide binary systems are an important laboratory to test this underlying assumption. Here, we present the detailed chemical abund…
Two Ultra-faint Milky Way Stellar Systems Discovered in Early Data from the DECam Local Volume Exploration Survey
Bechtol, K.; Zenteno, A.; Allam, S. +56 more
We report the discovery of two ultra-faint stellar systems found in early data from the DECam Local Volume Exploration survey (DELVE). The first system, Centaurus I (DELVE J1238-4054), is identified as a resolved overdensity of old and metal-poor stars with a heliocentric distance of ${\text{}}{D}_{\odot }={116.3}_{-0.6}^{+0.6}\,\mathrm{kpc}$ , a …