Search Publications
Spectral Evolution of Dark Asteroid Surfaces Induced by Space Weathering over a Decade
Hasegawa, Sunao; Marsset, Michaël; Im, Myungshin +20 more
The surfaces of airless bodies like asteroids in the solar system are known to be affected by space weathering. Experiments simulating space weathering are essential for studying the effects of this process on meteorite samples, but the problem is that the time spent to reproduce space weathering in these experiments is billions of times shorter t…
Isolated Massive Star Formation in G28.20-0.05
Law, Chi-Yan; Garay, Guido; Mardones, Diego +9 more
We report high-resolution 1.3 mm continuum and molecular line observations of the massive protostar G28.20-0.05 with Atacama Large Millimeter/submillimeter Array. The continuum image reveals a ring-like structure with 2000 au radius, similar to morphology seen in archival 1.3 cm Very Large Array observations. Based on its spectral index and associ…
KIC 2857323: A Double-mode High-amplitude δ Scuti Star with Amplitude Decline of the First Overtone Mode
Esamdin, Ali; Yang, Tao-Zhi; Zuo, Zhao-Yu +2 more
We investigate the pulsating behavior of KIC 2857323 using high-precision observations from the Kepler mission. Fourier analysis of 4 yr time-series data reveals five independent frequencies for the light variation. Among them, two strong frequencies f 1 and f 3 with a period ratio of 0.774 identify this star as a double-mode…
Gamma-Ray Diagnostics of r-process Nucleosynthesis in the Remnants of Galactic Binary Neutron-star Mergers
Katsuda, Satoru; Terada, Yukikatsu; Bamba, Aya +4 more
We perform a full nuclear-network numerical calculation of the r-process nuclei in binary neutron-star mergers (NSMs), with the aim of estimating gamma-ray emissions from the remnants of Galactic NSMs up to 106 yr old. The nucleosynthesis calculation of 4070 nuclei is adopted to provide the elemental composition ratios of nuclei with an…
An XMM-Newton EPIC X-Ray View of the Symbiotic Star R Aquarii
Toalá, Jesús A.; Sabin, Laurence; Guerrero, Martín A. +2 more
We present the analysis of archival XMM-Newton European Photon Imaging Camera (EPIC) X-ray observations of the symbiotic star R Aquarii. We used the Extended Source Analysis Software package to disclose diffuse soft X-ray emission extending up to 2.'2 (≈0.27 pc) from this binary system. The depth of these XMM-Newton EPIC observations reveals in un…
Nonthermal Radio Continuum Emission from Young Nearby Stars
Reffert, Sabine; Forbrich, Jan; Loinard, Laurent +5 more
Young and magnetically active low-mass stars often exhibit nonthermal coronal radio emission owing to the gyration of electrons in their magnetized chromospheres. This emission is easily detectable at centimeter wavelengths with the current sensitivity of large radio interferometers like the Very Large Array (VLA). With the aim of identifying near…
Jansky Very Large Array Detections of CO(1-0) Emission in H I-absorption-selected Galaxies at z ≳ 2
Prochaska, J. X.; Revalski, M.; Rafelski, M. +3 more
We report a Karl G. Jansky Very Large Array search for redshifted CO(1-0) emission from three H I-absorption-selected galaxies at z ≈ 2, identified earlier in their CO(3-2) or CO(4-3) emission. We detect CO(1-0) emission from DLA B1228-113 at z ≈ 2.1933 and DLA J0918+1636 at z ≈ 2.5848; these are the first detections of CO(1-0) emission in high-z …
Revisiting the Revisited Palmer Consensus: New Insights from Jovian Electron Transport
Engelbrecht, N. Eugene; Burger, R. A.; Herbst, Konstantin +2 more
Novel insights into the behavior of the diffusion coefficients of charged particles in the inner heliosphere are of great importance to any study of the transport of these particles and are especially relevant with regard to the transport of low-energy electrons. The present study undertakes an exhaustive investigation into the diffusion parameter…
Magnetic Field of Molecular Gas Measured with the Velocity Gradient Technique I. Orion A
Li, Dalei; Tang, Xindi; Zhou, Jianjun +8 more
Magnetic fields play an important role in the evolution of molecular clouds and star formation. Using the velocity gradient technique (VGT) model, we measured the magnetic field in Orion A using the 12CO, 13CO, and C18O(1-0) emission lines at a scale of ~0.07 pc. The measured B field shows an east-west orientation …
The Mg-K Anticorrelation in ω Centauri
Mucciarelli, Alessio; Bellazzini, Michele; Lardo, Carmela +2 more
We present [K/Fe] abundance ratios for a sample of 450 stars in ω Centauri, using high-resolution spectra acquired with the multiobject spectrograph FLAMES@VLT. Abundances for Fe, Na, and Mg were also derived. We detected intrinsic K variations in the analyzed stars. Moreover, [K/Fe] shows a significant correlation with [Na/Fe] and an anticorrelat…