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Fractionation in young cores: Direct determinations of nitrogen and carbon fractionation in HCN
Caselli, P.; Jensen, S. S.; Spezzano, S. +4 more
Context. Nitrogen fractionation is a powerful tracer of the chemical evolution during star and planet formation. It requires robust determinations of the nitrogen fractionation across different evolutionary stages.
Aims: We aim to determine the 14N/15N and 12C/13C ratios for HCN in six starless and …
Updated Kinematics of the Radcliffe Wave: Nonsynchronous, Dipole-like Vertical Oscillations
Fang, Min; Li, Guang-Xing; Wang, Junzhi +6 more
The kinematic information of the Radcliffe wave (RW) is essential for determining its existence and gaining insights into its origin and evolution. In this work, we present an accurate measurement of the vertical velocity (V Z ) of the RW by incorporating the radial velocity (RV) measures through two methods, which is crucial but was n…
NIR spectral classification of the companion in the gamma-ray binary HESS J1832-093 as an O6 V star
Papitto, A.; Negueruela, I.; de Oña Wilhelmi, E. +3 more
HESS J1832-093 is a member of the rare class of gamma-ray binaries, as recently confirmed by the detection of orbitally modulated X-ray and gamma-ray emission with a period of ~86 d. The spectral type of the massive companion star has been difficult to retrieve as there is no optical counterpart, but the system is coincident with a near-infrared s…
Constraints on Primordial Magnetic Fields from High Redshift Stellar Mass Density
Li, Shang; Zhang, Qile; Tan, Xiu-Hui +1 more
Primordial magnetic fields (PMFs) play a pivotal role in influencing small-scale fluctuations within the primordial density field, thereby enhancing the matter power spectrum within the context of the ΛCDM model at small scales. These amplified fluctuations accelerate the early formation of galactic halos and stars, which can be observed through a…
A multiwavelength study of Swift J0503.7-2819: a chimeric magnetic CV
Dewangan, G. C.; Buckley, D. A. H.; Singh, Kulinder Pal +7 more
We present multiwavelength temporal and spectral characteristics of a magnetic cataclysmic variable (MCV) Swift J0503.7-2819, using far ultraviolet and X-ray data from AstroSat, supplemented with optical data from the Southern African Large Telescope and X-ray data from the XMM-Newton and Swift observatories. The X-ray modulations at 4897.6657 s a…
Evolved Massive Stars at Low Metallicity. VII. The Lower Mass Limit of the Red Supergiant Population in the Large Magellanic Cloud
Tian, Hao; Yang, Ming; Gao, Jian +8 more
The precise definition of the lower mass limit of red supergiant stars (RSGs) is an open question in astrophysics and does not attract much attention. Here, we assemble a spectroscopic evolved cool star sample with 6602 targets, including RSGs, asymptotic giant branch stars, and red giant branch stars, in the Large Magellanic Cloud based on Gaia D…
The polarisation properties of the HD 181327 debris ring. Evidence for sub-micron particles from scattered light observations
Lasue, J.; Pinte, C.; Ménard, F. +26 more
Context. Polarisation is a powerful remote-sensing tool to study the nature of particles scattering the starlight. It is widely used to characterise interplanetary dust particles in the Solar System and increasingly employed to investigate extrasolar dust in debris discs' systems.
Aims: We aim to measure the scattering properties of the dust …
The CARMENES search for exoplanets around M dwarfs. Revisiting the GJ 581 multi-planetary system with new Doppler measurements from CARMENES, HARPS, and HIRES
Amado, P. J.; Caballero, J. A.; Reiners, A. +18 more
Context. GJ 581 is a nearby M dwarf known to host a packed multiple planet system composed of two super-Earths and a Neptune-mass planet. We present new orbital analyses of the GJ 581 system, utilizing recent radial velocity (RV) data obtained from the CARMENES spectrograph combined with newly reprocessed archival data from the HARPS and HIRES spe…
The Cosmic Ultraviolet Baryon Survey (CUBS). VIII. Group Environment of the Most Luminous Quasars at z ≈ 1
Johnson, Sean D.; Petitjean, Patrick; Zahedy, Fakhri S. +11 more
We investigate the group-scale environment of 15 luminous quasars (luminosity L 3000 > 1046 erg s‑1) from the Cosmic Ultraviolet Baryon Survey (CUBS) at redshift z ≈ 1. Using the Multi Unit Spectroscopic Explorer integral field spectrograph on the Very Large Telescope, we conduct a deep galaxy redshift survey in…
Physically Motivated Deep Learning to Superresolve and Cross Calibrate Solar Magnetograms
Maloney, Shane A.; Muñoz-Jaramillo, Andrés; Wright, Paul J. +7 more
Superresolution (SR) aims to increase the resolution of images by recovering detail. Compared to standard interpolation, deep learning-based approaches learn features and their relationships to leverage prior knowledge of what low-resolution patterns look like in higher resolution. Deep neural networks can also perform image cross-calibration by l…