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Transitions in magnetic behavior at the substellar boundary
Stelzer, B.; Raetz, St.; Magaudda, E. +3 more
We aim to advance our understanding of magnetic activity and the underlying dynamo mechanism at the end of the main sequence. To this end, we have embarked on collecting simultaneous X-ray and radio observations for a sample of M7..L0 dwarfs in the solar neighborhood using XMM-Newton jointly with the Jansky Very Large Array (JVLA) and the Australi…
Constraining Free–Free Emission and Photoevaporative Mass-loss Rates for Known Proplyds and New VLA–identified Candidate Proplyds in NGC 1977
Eisner, Josh A.; Boyden, Ryan D.
We present NSF's Karl G. Jansky Very Large Array observations covering the NGC 1977 region at 3.0, 6.4, and 15.0 GHz. We search for compact radio sources and detect continuum emission from 34 NGC 1977 cluster members and 37 background objects. Of the 34 radio-detected cluster members, 3 are associated with known proplyds in NGC 1977, 22 are associ…
Hitomi HXT deconvolution imaging of the Crab Nebula dazzled by the Crab pulsar
Maeda, Yoshitomo; Ishida, Manabu; Awaki, Hisamitsu +3 more
We develop a new deconvolution method to recover the precise Crab Nebula image taken by the Hitomi HXT, suppressing the artifact due to the bright Crab pulsar. We extend the Richardson-Lucy method, introducing two components corresponding to the nebula and pulsar with regularization for smoothness and flux, respectively, and performing simultaneou…
The Solar Neighborhood LI: A Variability Survey of Nearby M Dwarfs with Planets from Months to Decades with TESS and the CTIO/SMARTS 0.9 m Telescope
Henry, Todd J.; Jao, Wei-Chun; Vrijmoet, Eliot Halley +2 more
We present the optical photometric variability of 32 planet-hosting M dwarfs within 25 pc over timescales of months to decades. The primary goal of this project—A Trail to Life Around Stars (ATLAS)—is to follow the trail to life by revealing nearby M dwarfs with planets that are also "quiet," which may make them more amiable to habitability. There…
Gaia/GSP-spec spectroscopic properties of γ Doradus pulsators
Recio-Blanco, A.; de Laverny, P.; Aerts, C. +1 more
Context. The third Data Release of the ESA Gaia mission has provided a large sample of new gravity-mode pulsators, among which more than 11 600 are γ Dor stars. Aims. The goal of the present work is to present the spectroscopic parameters of these γ Dor pulsators estimated by the GSP-Spec module that analysed millions of Gaia spectra. Such a param…
Long-term X-ray temporal and spectral study of a Seyfert galaxy Mrk 6
Naik, Sachindra; Jana, Arghajit; Kumari, Neeraj +3 more
We present a long-term X-ray study of a nearby Active Galactic Nucleus Mrk 6, utilizing observations from XMM-Newton, Suzaku, Swift, and NuSTAR observatories, spanning 22 years from 2001 to 2022. From timing analysis, we estimated variance, normalized variance, and fractional rms amplitude in different energy bands.The temporal study shows fractio…
Spin–Orbit Alignment of Early-type Astrometric Binaries and the Origin of Slow Rotators
Kratter, Kaitlin M.; Moe, Maxwell; Smith, Chase L.
The spin–orbit alignment of binary stars traces their formation and accretion history. Previous studies of spin–orbit alignment have been limited to small samples, slowly rotating solar-type stars, and/or wide visual binaries that not surprisingly manifest random spin–orbit orientations. We analyze 917 Gaia astrometric binaries across periods P = …
Globular clusters and bar: captured or not captured?
Smirnov, Anton A.; Bobylev, Vadim V.; Bajkova, Anisa T.
Studies of the dynamics of globular clusters assume different values of bar parameters (mass, velocity, and size) and analyse the results of orbit classifications over the range of the chosen values. It is also a usual thing that a spherical bulge component is converted into the bar to obtain a non-axisymmetric potential from an axisymmetric one. …
Radial and azimuthal gradients of the moving groups in Gaia DR3: The slow and fast bar degeneracy problem
Antoja, T.; Bernet, M.; Monari, G. +2 more
Context. The structure and dynamics of the central bar of the Milky Way (MW) are still under debate whilst being fundamental ingredients for the evolution of our Galaxy. The recent Gaia DR3 offers an unprecedented detailed view of the 6D phase space of the MW, allowing for a better understanding of the complex imprints of the bar on the phase spac…
Magnetograms underestimate even unipolar magnetic flux nearly everywhere on the solar disk
Solanki, S. K.; Hirzberger, J.; Sinjan, J. +2 more
Context. The amount of magnetic flux passing through the solar surface is an important parameter determining solar activity and the heliospheric magnetic field. It is usually determined from line-of-sight magnetograms. Aims. We aim to test the reliability of determining the line-of-sight magnetic field from 3D MHD (magnetohydrodynamic) simulations…