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HH 175: a giant Herbig-Haro flow emanating from a multiple protostar
Friberg, Per; Reipurth, Bo
HH 175 is an isolated Herbig-Haro object seen towards the B35 cloud in the λ Ori region. We use deep Subaru 8 m interference filter images and Spitzer images to show that HH 175 is a terminal shock in a large collimated outflow from the nearby embedded source IRAS 05417+0907. The body of the eastern outflow lobe is hidden by a dense ridge of gas. …
Predicting the CME arrival time based on the recommendation algorithm
Luo, Bingxian; Liu, Zhu; Li, Ming +9 more
CME is one of the important events in the sun-earth system as it can induce geomagnetic disturbance and an associated space environment effect. It is of special significance to predict whether CME will reach the Earth and when it will arrive. In this paper, we firstly built a new multiple association list for 215 different events with 18 character…
The former companion of hyper-velocity star S5-HVS1
Hosek, Matthew W., Jr.; Li, Ting S.; Do, Tuan +4 more
The hyper-velocity star S5-HVS1, ejected 5 Myr ago from the Galactic Centre at 1800 km s-1, was most likely produced by tidal break-up of a tight binary by the supermassive black hole SgrA*. Taking a Monte Carlo approach, we show that the former companion of S5-HVS1 was likely a main-sequence star between 1.2 and 6 M⊙ and was…
LBV phenomenon and binarity: The environment of HR Car
Mehner, A.; de Wit, W. -J.; Agliozzo, C. +7 more
Luminous blue variable stars (LBVs) are of great interest in massive-star evolution as they experience very high mass-loss episodes within short periods of time. HR Car is a famous member of this class in the Galaxy. It has a large circumstellar nebula and has also been confirmed as being in a binary system. One means of gaining information about …
Science with the AstroSat Soft X-ray telescope: An overview
Dewangan, Gulab C.; Singh, Kulinder Pal; Bhattacharyya, Sudip +6 more
The Soft X-ray Telescope (SXT) aboard the AstroSat satellite is the first Indian X-ray telescope in space. It is a modest size X-ray telescope with a charge coupled device (CCD) camera in the focal plane, which provides X-ray images in the
Kinematics and ellipsoidal motion of the mid to late M-type stars
Elsanhoury, Waleed H.; Al-Johani, Amnah S.; Nouh, Mohamed I. +1 more
Truly, kinematics in the Solar neighborhood has provided important information both for the structure and for the evolution of the Galaxy since the early 20th century. The relationship between Oort constants and the ratio of the velocity dispersion are important quantities in stellar kinematics. In the present paper, we calculated the kinematical …
Analysis of Hybrid Gas-Dust Outbursts Observed at 67P/Churyumov-Gerasimenko
Parker, Joel Wm.; Bertaux, Jean-Loup; Stern, S. Alan +14 more
Cometary outbursts offer a valuable window into the composition of comet nuclei with their forceful ejection of dust and volatiles in explosive events, revealing the interior components of the comet. Understanding how different types of outbursts influence the dust properties and volatile abundances, to better interpret what signatures can be attr…
Updated studies on exomoons in the HD 23079 system
Cuntz, M.; Jagtap, O.; Quarles, B.
We re-evaluate the outer edge of orbital stability for possible exomoons orbiting the radial velocity planet discovered in the HD 23079 system. In this system, a solar-type star hosts a Jupiter-mass planet in a nearly circular orbit in the outer stellar habitable zone. The outer stability limit of exomoons is deduced using N-body and tidal migrati…
Solar Orbiter observations of the structure of reconnection outflow layers in the solar wind
Lewis, G. R.; Fedorov, A.; Livi, S. +22 more
We briefly review an existing model of the structure of reconnection layers which predicts that several more distinct layers, in the form of contact discontinuities, rotational Alfvèn waves, or slow shocks, should be identifiable in solar wind reconnection events than are typically reported in studies of reconnection outflows associated with bifur…
Magnetic Reconnection Inside Solar Wind Rotational Discontinuity During Its Interaction With the Quasi-Perpendicular Bow Shock and Magnetosheath
Wang, Xueyi; Lin, Yu; Du, Aimin +1 more
Using a three-dimensional global hybrid simulation, we investigate the formation and evolution of ion-scale magnetic reconnection inside an interplanetary rotational discontinuity (RD) owing to its interaction with the quasi-perpendicular (Q-⊥) bow shock and the magnetosphere. The interplanetary magnetic field (IMF) is initially predominantly nort…