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Deciphering the Kinematic Substructure of Local Dark Matter with LAMOST K Giants
Mao, Shude; Liu, Chao; Xue, Xiang-Xiang +5 more
Numerical simulations indicate that correlations exist between the velocity distributions of stars and dark matter (DM). We study the local DM velocity distribution based on these correlations. We select K giants from LAMOST DR8 cross-matched with Gaia DR3, which have robust measurements of velocity and metallicity, and separate them into the disk…
The COS-Holes Survey: Connecting Galaxy Black Hole Mass with the State of the CGM
Prochaska, J. Xavier; Crain, Robert A.; Burchett, Joseph N. +9 more
We present an analysis of Hubble Space Telescope COS/G160M observations of C IV in the inner circumgalactic medium (CGM) of a novel sample of eight z ∼ 0, L ≈ L ⋆ galaxies, paired with UV-bright QSOs at impact parameters (R proj) between 25 and 130 kpc. The galaxies in this stellar-mass-controlled sample (log10 M <…
Large-scale Mapping Observations of DCN and DCO+ toward Orion KL
Tamura, Yoichi; Kohno, Kotaro; Kawabe, Ryohei +16 more
We present emission maps ( $1\buildrel{\,\prime}\over{.} 5\,\times \,1\buildrel{\,\prime}\over{.} 5$ scale, corresponding to 0.18 pc) of the DCN (J = 2 ‑ 1) and DCO+ (J = 2 ‑ 1) lines in the 2 mm band toward the Orion KL region obtained with the 2 mm receiver system named B4R installed on the Large Millimeter Telescope. The DCN emission…
Multi-kilogauss magnetic field driving the magnetospheric accretion process in EX Lupi
Audard, M.; Kóspál, Á.; Lavail, A. +1 more
Context. EX Lupi is the prototype of EX Lup-type stars, which are classical T Tauri stars (cTTSs) with luminosity bursts and outbursts of 1–5 magnitudes that last for a few months to a few years. These events are ascribed to an episodic accretion that can occur repeatedly, but whose physical mechanism is still debated. Aims. We aim to investigate …
On the Determination of Stellar Mass and Binary Fraction of Open Clusters within 500 pc from the Sun
Chen, Li; Zhong, Jing; Hou, Jinliang +3 more
We investigated the stellar mass function and the binary fraction of 114 nearby open clusters (OCs) using the high-precision photometric data from Gaia Data Release 3 (Gaia DR3). We estimated the mass of member stars by using a ridge line that is better in line with the observed color–magnitude diagram, thus obtaining more accurate stellar mass an…
Simulated Coronal Mass Ejections on a Young Solar-type Star and the Associated Instantaneous Angular Momentum Loss
Tian, Hui; Alvarado-Gómez, Julián D.; Poppenhäger, Katja +3 more
Coronal mass ejections (CMEs) on stars can change the stars' magnetic field configurations and mass-loss rates during the eruption and propagation and therefore, may affect the stars' rotation properties on long timescales. The dynamics of stellar CMEs and their influence on the stellar angular momentum loss rate are not yet well understood. In or…
Unveiling the Small-scale Jets in the Rapidly Growing Supermassive Black Hole IZw1
Ho, Luis C.; Gallo, Luigi C.; Yao, Su +10 more
Accretion of black holes at near-Eddington or super-Eddington rates represents the most powerful episode driving black hole growth, potentially occurring across various types of objects. However, the physics governing accretion and jet–disk coupling in such states remains unclear, primarily due to the difficulty in detecting associated jets, which…
Relationships Between HCl, H2O, Aerosols, and Temperature in the Martian Atmosphere: 1. Climatological Outlook
Patel, M. R.; Montmessin, F.; Fedorova, A. A. +15 more
Detecting trace gases such as hydrogen chloride (HCl) in Mars' atmosphere is among the primary objectives of the ExoMars Trace Gas Orbiter (TGO) mission. Terrestrially, HCl is closely associated with active volcanic activity, so its detection on Mars was expected to point to some form of active magmatism/outgassing. However, after its discovery us…
A determination of the Large Magellanic Cloud dark matter subhalo mass using the Milky Way halo stars in its gravitational wake
Fushimi, K. J.; Mosquera, M. E.; Dominguez, M.
Aims: Our goal is to study the gravitational effects caused by the passage of the Large Magellanic Cloud (LMC) in its orbit on the stellar halo of the Milky Way.
Methods: We employed Gaia Data Release 3 to construct a halo tracers dataset consisting of K-giant stars and RR-Lyrae variables. Additionally, we compared the data with a theore…
HIP 65426 is a High-frequency Delta Scuti Pulsator in Plausible Spin–Orbit Alignment with its Directly Imaged Exoplanet
Huber, Daniel; Bedding, Timothy R.; Murphy, Simon J. +4 more
HIP 65426 hosts a young giant planet that has become the first exoplanet directly imaged with JWST. Using time-series photometry from the Transiting Exoplanet Survey Satellite (TESS), we classify HIP 65426 as a high-frequency δ Scuti pulsator with a possible large-frequency separation of Δν = 7.23 ± 0.02 cycles day‑1. We check the TESS …