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JWST NIRCam Observations of SN 1987A: Spitzer Comparison and Spectral Decomposition
Temim, Tea; Boyer, Martha L.; Gall, Christa +24 more
JWST Near Infrared Camera (NIRCam) observations at 1.5-4.5 µm have provided broadband and narrowband imaging of the evolving remnant of SN 1987A with unparalleled sensitivity and spatial resolution. Comparing with previous marginally spatially resolved Spitzer Infrared Array Camera (IRAC) observations from 2004 to 2019 confirms that the emis…
Unfolding Drift Effects for Cosmic Rays over the Period of the Sun's Magnetic Field Reversal
Luo, Xi; Potgieter, M. S.; Aslam, O. P. M. +2 more
A well-established, comprehensive 3D numerical modulation model is applied to simulate galactic protons, electrons, and positrons from 2011 May to 2015 May, including the solar magnetic polarity reversal of Solar Cycle 24. The objective is to evaluate how simulations compare with corresponding Alpha Magnetic Spectrometer observations for 1.0-3.0 G…
Understanding the Lateral Drifting of an Erupting Filament with a Data-constrained Magnetohydrodynamic Simulation
Schmieder, B.; Poedts, S.; Li, C. +6 more
Solar filaments often exhibit rotation and deflection during eruptions, which would significantly affect the geoeffectiveness of the corresponding coronal mass ejections (CMEs). Therefore, understanding the mechanisms that lead to such rotation and lateral displacement of filaments is a great concern to space weather forecasting. In this paper, we…
Still alive and kicking: A significant outburst in changing-look AGN Mrk 1018
Granzer, T.; Gaspari, M.; Combes, F. +13 more
Context. Changing-look active galactic nuclei (AGN) have been observed to change their optical spectral type. Mrk 1018 is particularly unique: first classified as a type 1.9 Seyfert galaxy, it transitioned to being a type 1 Seyfert galaxy a few years later before returning to its initial classification as a type 1.9 Seyfert galaxy after ∼30 years.…
A high fidelity Milky Way simulation with Kraken, Gaia-Enceladus, and Sequoia analogues: clues to their accretion histories
Grand, Robert J. J.; Kawata, Daisuke; García-Bethencourt, Guacimara +1 more
Within a simulated Milky Way-like galaxy, we identify and analyse analogues of the Gaia-Enceladus (GE), Kraken, and Sequoia mergers that each matches remarkably well observational results, including in velocity and chemical abundance space, and their distributions in the jz-Energy plane. The Kraken analogue is the earliest merger and ha…
The Gaia alerted fading of the FUor-type star Gaia21elv
Lee, Jeong-Eun; Gromadzki, Mariusz; Ábrahám, Péter +26 more
FU Orionis objects (FUors) are eruptive young stars, which exhibit outbursts that last from decades to a century. Due to the duration of their outbursts, and to the fact that only about two dozens of such sources are known, information on the end of their outbursts is limited. Here we analyse follow-up photometry and spectroscopy of Gaia21elv, a y…
Global Structure of Magnetotail Reconnection Revealed by Mining Space Magnetometer Data
Sitnov, M. I.; Genestreti, K. J.; Tsyganenko, N. A. +5 more
Reconnection in the magnetotail occurs along so-called X-lines, where magnetic field lines tear and detach from plasma on microscopic spatial scales (comparable to particle gyroradii). In 2017-2020, the Magnetospheric MultiScale (MMS) mission detected X-lines in the magnetotail enabling their investigation on local scales. However, the global stru…
JWST unveils the brown dwarf sequence of 47 Tucanæ
Bedin, L. R.; Nardiello, D.; Griggio, M.
We have developed a technique to restore scientific usage in compromised (publicly available) images collected with the JWST of the Galactic globular cluster NGC 104 (47 Tucanæ). In spite of the degradation and limited data, we were able to recover photometry and astrometry for the coolest stellar objects ever observed within a globular cluster, p…
Investigating 16 Open Clusters in the Kepler/K2-Gaia DR3 Field. I. Membership, Binary Systems, and Rotation
Bi, Shaolan; Ge, Zhishuai; Li, Tanda +9 more
Using data from Gaia Data Release 3 and Kepler/K2, we present a catalog of 16 open clusters with ages ranging from 4-4000 Myr that provides detailed information on membership, binary systems, and rotation. We assess the memberships in 5D phase space, and estimate the basic parameters of each cluster. Among the 20,160 members, there are 4381 stars …
Red horizontal branch stars: An asteroseismic perspective
Tailo, Marco; Stokholm, Amalie; Valentini, Marica +7 more
Robust age estimates of red giant stars are now possible thanks to the precise inference of their mass based on asteroseismic constraints. However, there are cases where such age estimates can be highly precise yet very inaccurate. An example is giants that have undergone mass loss or mass transfer events that have significantly altered their mass…