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Magnetic-field structure of the Crab pulsar wind nebula revealed with IXPE
Weisskopf, Martin C.; Slane, Patrick; Mizuno, Tsunefumi +5 more
We report a detailed study of the magnetic-field structure of the Crab pulsar wind nebula, using the X-ray polarization data in 2-8 keV obtained with the Imaging X-ray Polarimetry Explorer. Contamination of the data for the nebula region by the pulsar emission was removed through application of a stringent pulsation phase cut, extracting a phase r…
Revisiting planetary systems in the Okayama Planet Search Program: A new long-period planet, RV astrometry joint analysis, and a multiplicity-metallicity trend around evolved stars
Izumiura, Hideyuki; Sato, Bun'ei; Yoshida, Michitoshi +15 more
In this study, we revisit 32 planetary systems around evolved stars observed within the framework of the Okayama Planet Search Program (OPSP) and its collaborative framework of the East Asian Planet Search Network to search for additional companions and investigate the properties of stars and giant planets in multiple-planet systems. With our late…
Enlightening the dynamical evolution of Galactic open clusters: an approach using Gaia DR3 and analytical descriptions
Corradi, W. J. B.; Maia, F. F. S.; Angelo, M. S. +1 more
Most stars in our Galaxy form in stellar aggregates, which can become long-lived structures called open clusters (OCs). Along their dynamical evolution, their gradual depletion leave some imprints on their structure. In this work, we employed astrometric, photometric, and spectroscopic data from the Gaia DR3 catalogue to uniformly characterize a s…
Mineralogy of the Venus Surface
Gilmore, Martha S.; Ghail, Richard; Helbert, Jörn +6 more
Surface mineralogy records the primary composition, climate history and the geochemical cycling between the surface and atmosphere. We have not yet directly measured mineralogy on the Venus surface in situ, but a variety of independent investigations yield a basic understanding of surface composition and weathering reactions in the present era whe…
A remarkably stable accretion disc in the Seyfert galaxy MCG-5-23-16
Ingram, Adam; Bianchi, Stefano; Matt, Giorgio +12 more
MCG-5-23-16 is a Seyfert 1.9 galaxy at redshift z = 0.008 49. We analyse here the X-ray spectra obtained with X-ray Multi-Mirror (XMM)-Newton and Nuclear Spectroscopic Telescope Array (NuSTAR) data, which are the first contemporaneous observations with these two X-ray telescopes. Two reflection features, producing a narrow core and a broad compone…
BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208
Henning, Thomas; Reffert, Sabine; Viswanath, Gayathri +15 more
Recent observations by the B-star Exoplanet Abundance Study (BEAST) illustrate the existence of substellar companions around very massive stars. Here, we present the detection of two lower mass companions to a relatively nearby (148.7−1.3+1.5 pc), young (17−4+3 Myr), bright (V = 6.632 ± 0.006 mag), 2.58 …
Mind the Gap. I. Hα Activity of M Dwarfs Near the Partially/Fully Convective Boundary and a New Hα Emission Deficiency Zone on the Main Sequence
Henry, Todd J.; Paredes, Leonardo A.; Jao, Wei-Chun +4 more
Since identifying the gap in the H-R Diagram (HRD) marking the transition between partially and fully-convective interiors, a unique type of slowly pulsating M dwarf has been proposed. These unstable M dwarfs provide new laboratories in which to understand how changing interior structures can produce potentially observable activity at the surface.…
The 18-19 March 2022 series of 3He-rich events observed by Solar Orbiter at 0.36 au compared with EUV, X-ray, and radio observations
Maksimovic, M.; Vecchio, A.; Krucker, S. +10 more
Context. During the first close perihelion pass of Solar Orbiter, a series of impulsive 3He-rich solar particle events was observed on 18-19 March 2022 from a distance of 0.36 au. In addition to the energetic particle, radio, and X-ray data from Solar Orbiter, the events were observed in radio and/or extreme ultraviolet by STEREO-A, SDO…
Coronal properties of low-accreting AGNs using Swift, XMM-Newton, and NuSTAR observations
Safi-Harb, Samar; Chang, Hsiang-Kuang; Ricci, Claudio +6 more
We studied the broad-band X-ray spectra of Swift/Burst Alert Telescope selected low-accreting active galactic nuclei (AGNs) using the observations from XMM-Newton, Swift, and NuSTAR in the energy range of 0.5-150 keV. Our sample consists of 30 AGNs with Eddington ratio, λEdd < 10-3. We extracted several coronal parameters …
Magellan/M2FS and MMT/Hectochelle Spectroscopy of Dwarf Galaxies and Faint Star Clusters within the Galactic Halo
Caldwell, Nelson; Mateo, Mario; Roederer, Ian U. +5 more
We present spectroscopic data for 16,369 stellar targets within and/or toward 38 dwarf spheroidal galaxies and faint star clusters within the Milky Way halo environment. All spectra come from observations with the multiobject, fiber-fed echelle spectrographs M2FS at the Magellan/Clay telescope or Hectochelle at the MMT, reaching a typical limiting…