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Mid-infrared imaging of Supernova 1987A
Matsuura, Mikako; Barlow, M. J.; Meixner, Margaret +9 more
At a distance of 50 kpc, Supernova 1987A is an ideal target to study how a young supernova (SN) evolves in time. Its equatorial ring, filled with material expelled from the progenitor star about 20 000 yr ago, has been engulfed with SN blast waves. Shocks heat dust grains in the ring, emitting their energy at mid-infrared (IR) wavelengths We prese…
Interplay between Young Stars and Molecular Clouds in the Ophiuchus Star-forming Complex
Chen, Wen-Ping; Gupta, Aashish
We present spatial and kinematic correlation between the young stellar population and the cloud clumps in the Ophiuchus star-forming region. The stellar sample consists of known young objects at various evolutionary stages, taken from the literature, some of which are diagnosed with Gaia EDR3 parallax and proper-motion measurements. The molecular …
A Comparison of Solar X-Ray Flare Timescales and Peak Temperatures with Associated Coronal Mass Ejections
Kahler, S. W.; Ling, A. G.
Recent work has shown that plots of solar flare X-ray peak temperatures, Tm, versus log peak fluxes, Fp, show statistically significant separations of lower Tm flares with fast (Vcme ≥ 1000 km s-1) and wide (Wcme = 360°) strong coronal mass ejections (CMEs) from higher Tm flares with no CMEs or slow (Vcme < 1000 km s-1) or…
X-Ray Emission from the Exoplanet Hosting LTT 1445 Triple Star System
Brown, Alexander; France, Kevin; Youngblood, Allison +5 more
JWST will be able to observe the atmospheres of rocky planets transiting nearby M dwarfs. The M-dwarf triple star system LTT 1445, at a distance of 6.86 pc, hosts some of the nearest rocky terrestrial planets. These planets most likely orbit the M 3.5V star LTT 1445A. During a 28.6 ks Chandra ACIS-S3 observation we have: (i) spatially resolved and…
Modelling reconstruction and boulder size-frequency distribution of a young (<5 Myr) landslide located in Simud Vallis floor, Mars
Lucchetti, Alice; Pajola, Maurizio; Cremonese, Gabriele +8 more
We focus on a young (~ 4.5 Ma), 3.4 km long landslide located in the floor of Simud Vallis, Oxia Palus Quadrangle of Mars. By making use of a 2 m-scale HiRISE DEM we reconstruct the terrain surface before the landslide and in doing so we estimate the release and deposition heights and volumes related to the different stages of the landslide. Using…
On the Global Kinematic Positioning Variations During the September 2017 Solar Flare Events
Nie, Wenfeng; Rovira-Garcia, Adria; Wang, Yong +3 more
Several X-class solar flares (SFs) with different intensities and locations on the solar disk occurred in September 2017. Among them, the X9.3 SF on 6 September 2017 was the most intensive SF in the 24th solar cycle. In this study, we investigated and compared the ionospheric response to the different X-class SFs and their impacts on the Global Po…
Meta-analysis of Photometric and Asteroseismic Measurements of Stellar Rotation Periods: The Lomb–Scargle Periodogram, Autocorrelation Function, and Wavelet and Rotational Splitting Analysis for 92 Kepler Asteroseismic Targets
Suto, Yasushi; Benomar, Othman; Lu, Yuting +1 more
We perform intensity variability analyses (photometric analyses: the Lomb–Scargle periodogram, autocorrelation, and wavelet) and asteroseismic analysis of 92 Kepler solar-like main-sequence stars to understand the reliability of the measured stellar rotation periods. We focus on the 70 stars without reported stellar companions, and classify them i…
An extended scattered light disk around AT Pyx. Possible planet formation in a cometary globule
Schmidt, T. O. B.; Henning, T.; Ginski, C. +35 more
Aims: To understand how the multitude of planetary systems that have been discovered come to be, we need to study systems at different evolutionary stages, with different central stars but also in different environments. The most challenging environment for planet formation may be the harsh UV radiation field of nearby massive stars which qui…
The VMC survey - XLIX. Discovery of a population of quasars dominated by nuclear dust emission behind the Magellanic Clouds
Maitra, Chandreyee; Hopkins, Andrew M.; Haberl, Frank +14 more
Following the discovery of SAGE0536AGN (z ~ 0.14), with the strongest 10-µm silicate emission ever observed for an active galactic nucleus (AGN), we discovered SAGE0534AGN (z ~ 1.01), a similar AGN but with less extreme silicate emission. Both were originally mistaken as evolved stars in the Magellanic Clouds. Lack of far-infrared emission, …
Absorption Line Search through Three Local Group Dwarf Galaxy Halos
Bregman, Joel N.; Qu, Zhijie
Dwarf galaxies are missing nearly all of their baryons and metals from the stellar disk, which are presumed to be in a bound halo or expelled beyond the virial radius. The virial temperature for galaxies with M h ~ 109-1010 M ⊙ is similar to the collisional ionization equilibrium temperature for the C IV…