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Cliff collapse on Comet 67P/Churyumov-Gerasimenko - I. Aswan
Davidsson, Björn J. R.
The Aswan cliff on Comet 67P/Churyumov-Gerasimenko collapsed on 2015 July 10. Thereby, relatively pristine comet material from a depth of $\sim 12\, \mathrm{m}$ was exposed at the surface. Observations of the collapse site by the microwave instrument Rosetta/Microwave Instrument for Rosetta Orbiter (MIRO) have been retrieved from 8 months prior to…
Observational chemical signatures of the past FU Ori outbursts
Ábrahám, Péter; Kóspál, Ágnes; Smirnov-Pinchukov, Grigorii V. +4 more
FU Ori-type stars (FUors) are young stellar objects (YSOs) experiencing luminosity outbursts by a few orders of magnitude, which last for ~102 yr. A dozen of FUors are known up to date, but many more currently quiescent YSOs could have experienced such outbursts in the last ~103 yr. To find observational signatures of possibl…
A slightly oblate dark matter halo revealed by a retrograde precessing Galactic disk warp
Huang, Yang; Liu, Jifeng; Beers, Timothy C. +7 more
The shape of the dark matter (DM) halo is key to understanding the hierarchical formation of the Galaxy. Despite extensive efforts in recent decades, however, its shape remains a matter of debate, with suggestions ranging from strongly oblate to prolate. Here, we present a new constraint on its present shape by directly measuring the evolution of …
Minute-cadence observations of the LAMOST Fields with the TMTS - V. Machine learning classification of TMTS catalogues of periodic variable stars
Wang, Xiaofeng; Li, Tanda; Mo, Jun +17 more
Periodic variables are always of great scientific interest in astrophysics. Thanks to the rapid advancement of modern large-scale time-domain surveys, the number of reported variable stars has experienced substantial growth for several decades, which significantly deepened our comprehension of stellar structure and binary evolution. The Tsinghua U…
The Present-day Mass Function of Star Clusters in the Solar Neighborhood
Tang, Shih-Yun; Li, Jiadong; Pang, Xiaoying +5 more
This work analyzes the present-day mass function (PDMF) of 93 star clusters utilizing Gaia Data Release 3 data, with membership determined by the StarGo machine-learning algorithm. The impact of unresolved binary systems on mass estimation is rigorously assessed, adopting three mass ratio profiles for correction. The PDMF is characterized by the p…
A systematic study of the ultra-fast outflow responses to luminosity variations in active galactic nuclei
Guainazzi, Matteo; Bianchi, Stefano; Kara, Erin +7 more
Context. Ultra-fast outflows (UFOs) have been revealed in a large number of active galactic nuclei (AGN) in the past two decades. Their extreme velocities and high ionization states make them a promising candidate for AGN feedback on the evolution of the host galaxy. However, their exact underlying driving mechanism is not yet fully understood.
Triaxial Schwarzschild models of NGC 708: a 10-billion solar mass black hole in a low-dispersion galaxy with a Kroupa IMF
Bender, Ralf; Thomas, Jens; Saglia, Roberto P. +3 more
We report the discovery of a (1.0 ± 0.28) × 1010 M⊙ supermassive black hole (BH) at the centre of NGC 708, the Brightest Cluster Galaxy of Abell 262. Such high BH masses are very rare and allow to investigate BH-host galaxy scaling relations at the high mass end, which in turn provide hints about the (co)evolution of such sys…
Chemistry across dust and gas gaps in protoplanetary disks. Modelling the co-spatial molecular rings in the HD 100546 disk
van Dishoeck, E. F.; Leemker, M.; Wölfer, L. +2 more
Context. Nearby extended protoplanetary disks are commonly marked by prominent rings in dust emission, possibly carved by forming planets. High-resolution observations show that both the dust and the gas are structured. These molecular structures may be related to radial and azimuthal density variations in the disk and/or the disk chemistry.
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Storm-Time Very-Near-Earth Magnetotail Reconnection: A Statistical Perspective
Angelopoulos, V.; Beyene, F.
The ring current, an equatorial near-Earth current, fluctuates in response to solar wind plasma interactions with Earth's magnetosphere. Despite extensive research on storm-time ring current energization, direct evidence of the energy transport into the inner-magnetosphere that powers this current remains scarce. Recent observations revealing that…
The White-light Emissions in Two X-class Flares Observed by ASO-S and CHASE
Feng, Li; Gan, Weiqun; Ding, M. D. +9 more
The white-light continuum emissions in solar flares (i.e., white-light flares) are usually observed on the solar disk but, in a few cases, off the limb. Here we present on-disk as well as off-limb continuum emissions at 3600 Å (in the Balmer continuum) in an X2.1 flare (SOL2023-03-03T17:52) and an X1.5 flare (SOL2023-08-07T20:46), respectively, ob…