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First Resolved Scattered-light Images of Four Debris Disks in Scorpius-Centaurus with the Gemini Planet Imager
Matthews, Brenda C.; Duchêne, Gaspard; Esposito, Thomas M. +57 more
We present the first spatially resolved scattered-light images of four debris disks around members of the Scorpius-Centaurus (Sco-Cen) OB association with high-contrast imaging and polarimetry using the Gemini Planet Imager (GPI). All four disks are resolved for the first time in polarized light, and one disk is also detected in total intensity. T…
Studies of the 2018/Mars Year 34 Planet-Encircling Dust Storm
Guzewich, S. D.; Fedorova, A. A.; Kahre, M. A. +1 more
Mars' planet-encircling or global dust storms (GDSs) are an iconic and enigmatic feature of the Red Planet. Occurring every few Mars Years (MYs), on average, they are a stochastic process in the otherwise largely repeatable annual cycle of martian weather. In 2018 (MY 34 in the calendar of Clancy et al. [2000],
VVV WIN 1733-3349: a low extinction window to probe the far side of the Milky Way bulge
Minniti, D.; Benjamin, R. A.; Saito, R. K. +5 more
Windows of low extinction in the Milky Way (MW) have been used along the past decades for the study of the Galactic structure and the stellar population across the inner bulge and disc. Here, we report the analysis of another low extinction near-IR window discovered by the VISTA Variables in the Vía Láctea Survey (VVV). VVV WIN 1733-3349 is about …
X-ray and γ-ray orbital variability from the γ-ray binary HESS J1832-093
Reimer, O.; Martí-Devesa, G.
Context.γ-ray binaries are systems composed of a massive star and a compact object whose interaction leads to particle acceleration up to relativistic energies. In the last fifteen years, a few binaries have been found to emit at high energies, but their number is still low. The TeV source HESS J1832-093 has been proposed as a binary candidate, al…
Thermal properties of large main-belt asteroids observed by Herschel PACS
Marton, G.; Müller, T. G.; Kiss, C. +11 more
Non-resolved thermal infrared observations enable studies of thermal and physical properties of asteroids via thermo-physical models provided the shape and rotational properties of the target are well determined. We used calibration-programme Herschel PACS data (70, 100, 160 µm) and state-of-the-art shape models derived from adaptive-optics …
IRIS Observations of the Low-atmosphere Counterparts of Active Region Outflows
Polito, Vanessa; Testa, Paola; De Pontieu, Bart +2 more
Active region (AR) outflows have been studied in detail since the launch of Hinode/EIS and are believed to provide a possible source of mass and energy to the slow solar wind. In this work, we investigate the lower atmospheric counterpart of AR outflows using observations from the Interface Region Imaging Spectrograph (IRIS). We find that the IRIS…
HATS-37Ab and HATS-38b: Two Transiting Hot Neptunes in the Desert
Butler, R. P.; Henning, Th.; Mancini, L. +24 more
We report the discovery of two transiting Neptunes by the HATSouth survey. The planet HATS-37Ab has a mass of $0.099\pm 0.042$ ${M}_{{\rm{J}}}$ (31.5 ± 13.4 M⊕) and a radius of $0.606\pm 0.016$ ${R}_{{\rm{J}}}$ , and is on a $P=4.3315$ day orbit around a $V=12.266\pm 0.030$ mag, ${0.843}_{-0.012}^{+0.017}$ ${M}_{\odot }$ star with a rad…
Magnetic Reconnection Invoked by Sweeping of the CME-driven Fast-mode Shock
Lin, Jun; Wang, Jingxiu; Zhang, Yuzong +4 more
Coronal waves exist ubiquitously in the solar atmosphere. They are important not only because of their rich physics but also because they are essential candidates for triggering remote magnetic eruptions. However, the latter mechanism has never been directly confirmed. By revisiting the successive eruptions on 2012 March 7, fast-mode shocks are id…
Seasonal evolution of temperatures in Titan's lower stratosphere
Irwin, P. G. J.; Teanby, N. A.; Bézard, B. +4 more
The Cassini mission offered us the opportunity to monitor the seasonal evolution of Titan's atmosphere from 2004 to 2017, i.e. half a Titan year. The lower part of the stratosphere (pressures greater than 10 mbar) is a region of particular interest as there are few available temperature measurements, and because its thermal response to the seasona…
Optical and Infrared Study of the Obscured B[e] Supergiant High-mass X-Ray Binary IGR J16318-4848
Chaty, Sylvain; Fortin, Francis; Sander, Andreas
The supergiant high-mass X-ray binary IGR J16318-4848 was the first source detected by the INTErnational Gamma-Ray Astrophysics Laboratory satellite in 2003 and distinguishes itself by its high intrinsic absorption and B[e] phenomenon. It is the perfect candidate to study both binary interaction and the environment of supergiant B[e] stars. This s…