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Toward the fabric of the Milky Way: I. The density of disk streams from a local 2503 pc3 volume
Meingast, Stefan; Alves, João; Ratzenböck, Sebastian +3 more
We studied 12 disk streams found in a 2503 pc3 volume in the solar neighborhood, which we define as coeval and comoving stellar structures with aspect ratios greater than 3:1. Using Gaia Data Release 3 data and the advanced clustering algorithms SigMA and Uncover, we identified and characterized these streams beyond the searc…
X-ray study of WR 48-6: A possible colliding wind binary: X-ray study of WR 48-6: a possible colliding...
Tej, Anandmayee; Pandey, Jeewan C.; Jadoliya, Vishal
This paper presents an investigation of the X-ray emission associated with the Wolf–Rayet star, WR 48-6, using observations from the XMM-Newton and Chandra X-ray telescopes covering two epochs separated by eleven months. The X-ray spectrum of WR 48-6 is well explained by a two-temperature plasma model, with cool and hot plasma temperatures of
HADES RV Programme with HARPS-N at TNG: XVI. A super-Earth in the habitable zone of the GJ 3998 multi-planet system
Rebolo, R.; Ribas, I.; Scandariato, G. +12 more
The low masses of M dwarfs create attractive opportunities for exoplanet radial-velocity (RV) detections. These stars, however, exhibit strong stellar activity that may attenuate or mimic planetary signals. We present a velocimetric analysis of one such M dwarf, GJ 3998 (d = 18.2 pc), with two published short-period super-Earths: GJ 3998 b and GJ …
The Stellar Abundances and Galactic Evolution Survey (SAGES). II. Machine Learning–based Stellar Parameters for 21 Million Stars from the First Data Release
Zhao, Gang; Fan, Zhou; Wang, Wei +14 more
Stellar parameters for large samples of stars play a crucial role in constraining the nature of stars and stellar populations in the Galaxy. An increasing number of medium-band photometric surveys are presently used in estimating stellar parameters. In this study, we present a machine learning approach to derive estimates of stellar parameters, in…
Study of solar activities associated with a Halo CME on 17 Feb 2023 event
Ahamed, A. Ansar; Subramanian, S. Prasanna; Rahman, A. Mujiber +3 more
In the present work, propagation of an earth directed fast and wide Coronal Mass Ejection event on 17 February 2023 is studied in detail. The complex magnetic configuration in the Active Region (AR) 13229 at N25E64 caused an intensive X2.3 flare with a peak at 19:38 UT. It is followed by a massive halo CME event observed in the LASCO C3 coronagrap…
An Improved Halo Coronal Mass Ejection Geoeffectiveness Prediction Model Using Multiple Coronal Mass Ejection Features Based on the DC-PCA-KNN Method
Ye, Dalin; Li, Huimin; Guo, Lixin +1 more
Coronal mass ejections (CME) are regarded as the main drivers of geomagnetic storms (GSs). In the prediction of geoeffectiveness, various CME features have been introduced without adequately considering the geoeffectiveness of CMEs and strong correlations among the features. In this study, a feature dimension reduction method combining distance co…
Discovery of the variable optical counterpart of the redback pulsar PSR J2055+1545
Kennedy, Mark R.; Turchetta, Marco; Sen, Bidisha +5 more
We present the discovery of the variable optical counterpart to PSR J2055
New ultracool dwarf candidates from multi-epoch WISE data
Malkov, O.; Karpov, S.; Avdeeva, A.
Context. Thirty years after the discovery of brown dwarfs, the search for these objects continues, particularly in the vicinity of the Sun. Objects near the Sun are characterized by large proper motions, making them be seen as fast-moving objects. While the Gaia DR3 catalog is a comprehensive source of proper motions, it lacks the depth needed for…
TOI-6038 A b: A Dense Sub-Saturn in the Transition Regime between the Neptunian Ridge and Savanna
Bieryla, Allyson; Latham, David W.; Eastman, Jason D. +13 more
We present the discovery and characterization of a sub-Saturn exoplanet, TOI-6038 A b, using the PARAS-2 spectrograph. The planet orbits a bright (mV = 9.9), metal-rich late F-type star, TOI-6038 A, with Teff = 6110 ± 100 K,
Impact of radiative accelerations on the stellar characterization of FGK-type stars using spectroscopic and seismic constraints
Deal, Morgan; Bossini, Diego; Moedas, Nuno
Context. Chemical transport mechanisms are fundamental processes in stellar evolution models. They are responsible for the chemical distribution, and their impact determines how accurately we can characterize stars. Radiative accelerations are one of these processes. They allow the accumulation of elements at different depths in the star. Aims. We…