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Can we constrain structure growth from galaxy proper motions?
Alonso, David; Slosar, Anže; Storey-Fisher, Kate +1 more
Galaxy peculiar velocities can be used to trace the growth of structure on cosmological scales. In the radial direction, peculiar velocities cause redshift space distortions, an established cosmological probe, and can be measured individually in the presence of an independent distance indicator. In the transverse direction, peculiar velocities cau…
12C/13C of Kepler giant stars: The missing piece of the mixing puzzle
Reylé, C.; Lagarde, N.; Miglio, A. +6 more
Context. Despite a rich observational background, few spectroscopic studies have dealt with the measurement of the carbon isotopic ratio in giant stars. However, it is a key element in understanding the mixing mechanisms that occur in the interiors of giant stars.
Aims: We present the CNO and 12C/13C abundances derived f…
Age Analysis of Extrasolar Planets: Insight from Stellar Isochrone Models
Narang, Mayank; Swastik, C.; Banyal, Ravinder K. +2 more
There is growing evidence from stellar kinematics and galactic chemical evolution suggesting that giant planets (M P ≥ 0.3M J ) are relatively young compared to the most commonly occurring population of small planets (M P < 0.3M J ). To further test the validity of these results, we analyzed the…
Spectral and timing properties of the accreting millisecond X-ray pulsar IGR J17498‑2921 during its 2023 outburst
Sanna, A.; Papitto, A.; Di Salvo, T. +13 more
We present a comprehensive study of the spectral properties of the accreting millisecond X-ray pulsar IGR J17498‑2921 during its 2023 outburst. Similar to other accreting millisecond X-ray pulsars, the broadband spectral emission observed quasi-simultaneously by NICER and NuSTAR is well described by an absorbed Comptonized emission with an electro…
Extragalactic 85Rb/87Rb and 6Li/7Li ratios in the Small Magellanic Cloud
Bonifacio, P.; Molaro, P.; Cupani, G. +1 more
Aims. The line of sight toward Sk 143 (AzV 456), an O9.5 Ib star in the Small Magellanic Cloud (SMC), shows significant absorption from neutral atoms and molecules. We report a new study of this line of sight by means of high-resolution spectra obtained with the ESPRESSO spectrograph at the VLT of ESO. Methods. The absorption from neutral and ioni…
Photospheric signatures of CME onset
Fletcher, L.; Romano, P.; MacTaggart, D. +2 more
Coronal mass ejections (CMEs) are solar eruptions that involve large-scale changes to the magnetic topology of an active region. There exists a range of models for CME onset which are based on twisted or sheared magnetic field above a polarity inversion line (PIL). We present observational evidence that topological changes at PILs, in the photosph…
Detection of Extragalactic Anomalous Microwave Emission in NGC 2903 Using KVN Single-dish Observations
Tsai, Chao-Wei; Hoang, Thiem; Nakanishi, Hiroyuki +4 more
We present the results of the single-dish observations using the Korean VLBI Network to search for anomalous microwave emission (AME) in nearby galaxies. The targets were selected from 'Mapping the dense molecular gas in the strongest star-forming galaxies' (MALATANG), a legacy survey project of the James Clerk Maxwell Telescope. The MALATANG gala…
Near-infrared observations of outflows and young stellar objects in the massive star-forming region AFGL 5180
Zhang, X.; Zhang, Y.; Telkamp, Z. +30 more
Context. Massive stars play important roles throughout the universe; however, their formation remains poorly understood. Observations of jets and outflows in high-mass star-forming regions, as well as surveys of young stellar object (YSO) content, can help test theoretical models of massive star formation.
Aims: We aim at characterizing the m…
Determining the Influence of the IMF and Planetary Magnetic Field Models on Mercury's Magnetosphere Along Spacecraft Trajectories of MESSENGER, BepiColombo and MPO
Heyner, Daniel; Exner, Willi; Griton, Léa. S.
Mercury's planetary magnetic field models (PMFMs) agree on a majorly dipolar field structure with a northward shift of the magnetic equator. However, due to the northerly biased orbit coverage of past spacecraft missions and different data analyzing methods, the available PMFMs differ in the determined multipole magnitudes for the dipole, quadrupo…
HST SHEL: Enabling Comparative Exoplanetology with HST/STIS
Sing, David K.; Stevenson, Kevin B.; López-Morales, Mercedes +12 more
The Hubble Space Telescope (HST) has been our most prolific tool to study exoplanet atmospheres. As the age of JWST begins, there are a wealth of HST archival data that are useful to strengthen our inferences from JWST. Notably, HST/Space Telescope Imaging Spectrograph (STIS), with its 0.3–1 µm wavelength coverage, extends past JWST's 0.6 &m…