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A systematic study of Galactic infrared bubbles along the Galactic plane with AKARI and Herschel
Oyabu, Shinki; Kaneda, Hidehiro; Ishihara, Daisuke +7 more
Galactic infrared (IR) bubbles, which have shell-like structures in the mid-IR wavelengths, are known to contain massive stars near their centers. Infrared bubbles in inner Galactic regions (|l| ≤ 65°, |b| ≤ 1°) have so far been studied well to understand the massive star formation mechanisms. In this study, we expand the research area to the whol…
Spectral Evolution and Radial Dust Transport in the Prototype Young Eruptive System EX Lup
Carmona, A.; Ábrahám, P.; Chen, L. +7 more
EX Lup is the prototype of a class of pre-main-sequence eruptive stars defined by their repetitive outbursts lasting several months. In 2008 January-September EX Lup underwent its historically largest outburst, brightening by about 4 mag in visual light. In previous studies we discovered ongoing silicate crystal formation in the inner disk during …
Jovian Auroral Radio Sources Detected In Situ by Juno/Waves: Comparisons With Model Auroral Ovals and Simultaneous HST FUV Images
Kurth, W. S.; Lamy, L.; Zarka, P. +4 more
Since the discovery of Jovian auroral radio emissions, the question arises of the source positions of the different components (broadband kilometric, hectometric, and decametric) and their association with far ultraviolet (FUV) auroral emissions. We surveyed Juno's first 15 perijoves to track local radio sources from in situ Juno/Waves measurement…
Green Peas in X-Rays
Ehle, M.; Svoboda, J.; Orlitová, I. +1 more
Green Peas represent a population of compact, highly star-forming dwarf galaxies at redshifts z ∼ 0.2-0.3 that have recently been found to show signatures of ultraviolet ionizing radiation leakage. They are being considered as analogs to high-redshift star-forming galaxies, possibly responsible for cosmic reionization. Despite intensive studies of…
Observing the gas component of circumplanetary disks around wide-orbit planet-mass companions in the (sub)mm regime
Waters, L. B. F. M.; Woitke, P.; Kamp, I. +6 more
Context. Several detections of wide-orbit planet-mass/substellar companions around young solar-like stars were reported in the last decade. The origin of those possible planets is still unclear, but accretion tracers and VLT/SPHERE observations indicate that they are surrounded by circumplanetary material or even a circumplanetary disk (CPD).
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A NuSTAR study of the 55 ks hard X-ray pulse-phase modulation in the magnetar 4U 0142+61
Enoto, Teruaki; Makishima, Kazuo; Nakazawa, Kazuhiro +1 more
Archival NuSTAR data of the magnetar 4U 0142+61, acquired in 2014 March for a total time span of 258 ks, were analyzed. This is to reconfirm the 55 ks modulation in the hard X-ray pulse phases of this source, found with a Suzaku observation in 2009 (Makishima et al., 2014, Phys. Rev. Lett., 112, 171102). Indeed, the 10-70 keV X-ray pulsation, dete…
An 11 Earth-mass, Long-period Sub-Neptune Orbiting a Sun-like Star
López-Morales, Mercedes; Latham, David W.; Mayo, Andrew W. +27 more
Although several thousands of exoplanets have now been detected and characterized, observational biases have led to a paucity of long-period, low-mass exoplanets with measured masses and a corresponding lag in our understanding of such planets. In this paper we report the mass estimation and characterization of the long-period exoplanet Kepler-538…
Dust production in the debris disk around HR 4796 A
Ménard, F.; Augereau, J. -C.; Bayo, A. +21 more
Context. Debris disks are the natural by-products of the planet formation process. Scattered or polarized light observations are mostly sensitive to small dust grains that are released from the grinding down of bigger planetesimals.
Aims: High angular resolution observations at optical wavelengths can provide key constraints on the radial and…
Investigating dynamical properties of evolved Galactic open clusters
Corradi, W. J. B.; Santos, J. F. C.; Maia, F. F. S. +1 more
Context. The stellar content of Galactic open clusters is gradually depleted during their evolution as a result of internal relaxation and external interactions. The final residues of the long-term evolution of open clusters are called open cluster remnants. These are sparsely populated structures that can barely be distinguished from the field. <…
Infrared luminosity functions based on 18 mid-infrared bands: revealing cosmic star formation history with AKARI and Hyper Suprime-Cam*
Momose, Rieko; Hashimoto, Tetsuya; Goto, Tomotsugu +21 more
Much of star formation is obscured by dust. For a complete understanding of the cosmic star formation history (CSFH), infrared (IR) census is indispensable. AKARI carried out deep mid-infrared observations using its continuous nine-band filters in the North Ecliptic Pole (NEP) field (5.4 deg2). This took a significant amount of the sate…