Search Publications
CO in the C1 globule of the Helix nebula with ALMA
Avison, A.; Zijlstra, A.; Andriantsaralaza, M.
We present and analyse 12CO, 13CO, and C18O(2-1) ALMA observations of the C1 globule inside the Helix nebula in order to determine its physical properties. Our findings confirm the molecular nature of the globule with a multipeak structure. The 12CO line has a high optical depth τ ∼10. The derived 1…
The Isotropic Interplanetary Dust Cloud and Near-infrared Extragalactic Background Light Observed with COBE/DIRBE
Matsuura, S.; Sano, K.; Yomo, K. +1 more
We report observation of isotropic interplanetary dust (IPD) by analyzing the infrared (IR) maps of the Diffuse Infrared Background Experiment (DIRBE) on board the Cosmic Background Explorer (COBE) spacecraft. To search for the isotropic IPD, we perform new analysis in terms of the solar elongation angle (ɛ), because we expect the zodiacal light (…
A new look at Sco OB1 association with Gaia DR2
Costa, E.; Carraro, G.; Yalyalieva, L. +3 more
We present and discuss photometric optical data in the area of the OB association Sco OB1 covering about 1 deg2. UBVI photometry is employed in tandem with Gaia DR2 data to investigate the three-dimensional structure and the star formation history of the region. By combining parallaxes and proper motions, we identify seven physical grou…
CFHT MegaPrime/MegaCam u-band source catalogue of the AKARI North Ecliptic Pole Wide field
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +10 more
The $AKARI$ infrared (IR) space telescope conducted two surveys (Deep and Wide) in the North Ecliptic Pole (NEP) field to find more than 100 000 IR sources using its infrared camera (IRC). IRC's nine filters, which cover wavebands from 2 to 24 µm continuously, make $AKARI$ unique in comparison with other IR observatories such as $Spitzer$ or…
RELICS: A Very Large (θE ∼ 40″) Cluster Lens—RXC J0032.1+1808
Ouchi, Masami; Mahler, Guillaume; Bradač, Maruša +38 more
Extensive surveys with the Hubble Space Telescope over the past decade, targeting some of the most massive clusters in the sky, have uncovered dozens of galaxy cluster strong lenses. The massive cluster strong-lens scale is typically θE ∼ 10″ to ∼30″-35″, with only a handful of clusters known with Einstein radii θE ∼ 40″ or a…
Upper Limits on Planet Occurrence around Ultracool Dwarfs with K2
Muirhead, Philip S.; Sagear, Sheila A.; Skinner, Julie N.
The occurrence of planets orbiting ultracool dwarfs is poorly constrained. We present results from a guest observer program on NASA's K2 spacecraft to search for transiting planets orbiting a sample of 827 ultracool dwarfs. Having found no transiting planets in our sample, we determined an upper limit on the occurrence of planets. We simulated pla…
Properties of Galactic B[e] Supergiants. V. 3 Pup-Constraining the Orbital Parameters and Modeling the Circumstellar Environments
Miroshnichenko, A. S.; Manset, N.; Zharikov, S. V. +9 more
We report the results of long-term spectroscopic monitoring of the A-type supergiant with the B[e] phenomenon 3 Pup = HD 62623. We confirm earlier findings that it is a binary system. The orbital parameters were derived using cross-correlation of the spectra in a range of 4460-4632 Å, which contains over 30 absorption lines. The orbit was found to…
Ionosphere Feedback to Electron Scattering by Equatorial Whistler Mode Waves
Artemyev, A. V.; Runov, A.; Shen, Y. +5 more
Plasma sheet electron precipitation, much of it driven by whistler mode waves, is critical for magnetosphere-ionosphere coupling. This precipitation leads to a secondary electron population at low altitudes, which moves upward along magnetic field lines to the equatorial plasma sheet. We investigate observational evidence for such electron precipi…
Polarisation and source structure of solar stationary type IV radio bursts
Klein, Karl-Ludwig; Salas-Matamoros, Carolina
The reconfiguration of the magnetic field during and after a coronal mass ejection (CME) may be accompanied by radio emission from non-thermal electrons. In particular, stationary type IV bursts (also called storm continua) are emitted by electrons in closed magnetic configurations usually located in the wake of the outward-travelling CME. Althoug…
A Survey of Small-Scale Waves and Wave-Like Phenomena in Jupiter's Atmosphere Detected by JunoCam
Wong, Michael H.; Fletcher, Leigh N.; Ingersoll, Andrew P. +17 more
In the first 20 orbits of the Juno spacecraft around Jupiter, we have identified a variety of wave-like features in images made by its public-outreach camera, JunoCam. Because of Juno's unprecedented and repeated proximity to Jupiter's cloud tops during its close approaches, JunoCam has detected more wave structures than any previous surveys. Most…