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PHANGS-JWST First Results: Spurring on Star Formation: JWST Reveals Localized Star Formation in a Spiral Arm Spur of NGC 628
Sandstrom, Karin M.; Henshaw, Jonathan D.; Kruijssen, J. M. Diederik +34 more
We combine JWST observations with Atacama Large Millimeter/submillimeter Array CO and Very Large Telescope MUSE Hα data to examine off-spiral arm star formation in the face-on, grand-design spiral galaxy NGC 628. We focus on the northern spiral arm, around a galactocentric radius of 3-4 kpc, and study two spurs. These form an interesting contrast,…
The detection of transiting exoplanets by Gaia
Gomel, Roy; Mazeh, Tsevi; Audard, Marc +14 more
Context. The space telescope Gaia is mainly dedicated to performing high-precision astrometry but is also used to perform spectroscopy and epoch photometry, which can be used to study various types of photometric variability. One such variability type is exoplanetary transits. The photometric data accumulated so far have finally matured enough to …
A Solar-cycle Study of Coronal Rotation: Large Variations, Rapid Changes, and Implications for Solar-wind Models
Morgan, Huw; Williams, Thomas; Kuridze, David +1 more
Information on the rotation rate of the corona, and its variation over latitude and solar cycle, is valuable for making global connections between the corona and the Sun, for global estimates of reconnection rates and as a basic parameter for solar-wind modeling. Here, we use a time series of tomographical maps gained from coronagraph observations…
Exploring the Circular Polarisation of Low-Frequency Solar Radio Bursts with LOFAR
Kumari, Anshu; Zucca, Pietro; Vocks, Christian +9 more
The Sun is an active star that often produces numerous bursts of electromagnetic radiation at radio wavelengths. Low frequency radio bursts have recently been brought back to light with the advancement of novel radio interferometers. However, their polarisation properties have not yet been explored in detail, especially with the Low Frequency Arra…
Ensemble-based unsupervised machine learning method for membership determination of open clusters using Mahalanobis distance
Deb, Sukanta; Baruah, Amiya; Kumar, Subhash
We present an improved method for the determination of membership of an open cluster using ensemble-based unsupervised machine learning techniques. The working principle of this method relies on two stages: (i) choosing a suitable range of three astrometric parameters (π, µαcos δ, µδ) using k-nearest neighbour (kN…
The importance of Fe fragmentation for LiBeB analyses. Is a Li primary source needed to explain AMS-02 data?
Maurin, D.; Ferronato Bueno, E.; Génolini, Y. +2 more
Context. High-precision data from AMS-02 on Li, Be, and B provide the best constraints on Galactic cosmic-ray transport parameters.
Aims: We re-evaluate the impact of Fe fragmentation on the Li, Be, and B modelling. We discuss the consequences on the transport parameter determination and reassess whether a primary source of Li is needed to ma…
TYC 2990-127-1: An Algol-type SB2 binary system of subgiant and red giant with a probable ongoing mass-transfer
Han, Zhanwen; Kovalev, Mikhail; Chen, Xuefei +3 more
We present a study of the spectroscopic binary TYC 2990-127-1 from the LAMOST survey. We use full-spectrum fitting to derive radial velocities and spectral parameters. The high mass ratio indicates that the system underwent mass transfer in the past. We compute the orbital solution and find that it is a very close sub-giant/red giant pair on circu…
Measuring weak lensing masses on individual clusters
Melin, Jean-Baptiste; Bartlett, James G.; Murray, Calum +1 more
We present weak lensing mass estimates for a sample of 458 galaxy clusters from the redMaPPer Sloan Digital Sky Survey DR8 catalogue using Hyper Suprime-Cam weak lensing data. We develop a method to quickly estimate cluster masses from weak lensing shear and use this method to estimate weak lensing masses for each of the galaxy clusters in our sam…
GJ 229B: Solving the Puzzle of the First Known T Dwarf with the APOLLO Retrieval Code
Mandell, Avi M.; McElwain, Michael W.; Howe, Alex R.
GJ 229B was the first T dwarf to be discovered in 1995, and its spectrum has been more thoroughly observed than that of most other brown dwarfs. Yet a full spectroscopic analysis of its atmosphere has not been done with modern techniques. This spectrum has several peculiar features, and recent dynamical estimates of GJ 229B's mass and orbit have d…
MICROSCOPE mission scenario, ground segment and data processing
Bergé, Joel; Chhun, Ratana; Métris, Gilles +9 more
Testing the weak equivalence principle to a precision of 10-15 requires a quantity of data that give enough confidence on the final result: ideally, the longer the measurement the better the rejection of the statistical noise. The science sessions had a duration of 120 orbits maximum and were regularly repeated and spaced out to accommo…