Search Publications
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…
A two-minute burst of highly polarized radio emission originating from low Galactic latitude
Qiu, Hao; Shannon, Ryan M.; Auchettl, Katie +19 more
Several sources of repeating coherent bursts of radio emission with periods of many minutes have now been reported in the literature. These 'ultralong period' (ULP) sources have no clear multiwavelength counterparts and challenge canonical pulsar emission models, leading to debate regarding their nature. In this work, we report the discovery of a …
Cloud–Cloud Collision and Cluster Formation in the W5-NW Complex
Tej, Anandmayee; Liu, Hong-Li; Liu, Tie +5 more
We present a detailed structural and gas kinematic study of the star-forming complex W5-NW. A cloud–cloud collision scenario unravels with evidence of collision-induced star and cluster formation. Various signatures of cloud–cloud collision such as "complementary distribution" and "bridging features" are explored. At the colliding region, the two …
Investigating Mass Segregation of the Binary Stars in the Open Cluster NGC 6819
von Hippel, Ted; Motherway, Erin; Geller, Aaron M. +2 more
We search for mass segregation in the intermediate-aged open cluster NGC 6819 within a carefully identified sample of probable cluster members. Using photometry from Gaia, Pan-STARRS, and the Two Micron All Sky Survey as inputs for a Bayesian statistics software suite, BASE-9, we identify a rich population of (photometric) binaries and derive post…