Search Publications
Probing grand unification with quantum sensors
Calmet, Xavier; Sherrill, Nathaniel
We discuss how grand unification can be probed with experiments at low energies using quantum sensors. Specifically, we show that scalar multiplets coupled to the gauge sector of a grand unified theory provide a mechanism for a time-varying unified coupling which has low-energy consequences which can be probed with quantum sensors. We then assume …
A GMRT 610 MHz radio survey of the North Ecliptic Pole (NEP, ADF-N) / Euclid Deep Field North
Burgarella, D.; Shimwell, T. W.; Serjeant, S. +17 more
This paper presents a 610 MHz radio survey covering 1.94 deg
A soft and transient ultraluminous X-ray source with six-hour modulation in the NGC 300 galaxy
Tiengo, A.; de Martino, D.; Pinto, C. +13 more
We investigate the nature of CXOU J005440.5−374320 (J0054), a peculiar bright (∼4 × 1039 erg s−1) and soft X-ray transient in the spiral galaxy NGC 300 with a six-hour periodic flux modulation that was detected in a 2014 Chandra observation. Subsequent observations with Chandra and XMM-Newton, as well as a large observational…
The Differences in the Origination and Properties of the Near-Earth Solar Wind between Solar Cycles 23 and 24
Fu, Hui; Xia, Lidong; Huang, Zhenghua +5 more
The dependence of the sources and properties of the near-Earth solar wind on solar cycle activity is an important issue in solar and space physics. We use the improved "two-step" mapping procedure that takes into account the initial acceleration processes to trace the near-Earth solar winds back to their source regions from 1999–2020, covering sol…
Mini-Plasmaströme als Quelle des Sonnenwindes
Schühle, Udo; Peter, Hardi; Chitta, Lakshmi Pradeep
Aufnahmen der Raumsonde Solar Orbiter der ESA und NASA bieten den bisher detailliertesten Blick auf eine Quellregion des Teilchenstroms von der Sonne. Das legt nahe, dass der Sonnenwind nicht als gleichmäßiger Teilchenstrom ausgestoßen wird.
Markov Chain Monte Carlo optimization applied to double stars from Miller & Pitman research
Budding, Edwin; Rhodes, Michael D.; Banks, Timothy +1 more
Model orbits have been fitted to 27 physical double stars listed in a 1922 catalog. A Markov Chain Monte Carlo technique was applied to estimate best-fitting values and associated uncertainties for the orbital parameters. Dynamical masses were calculated using parallaxes from the Hipparcos mission and are presented in this paper with the estimates…
The Radio Continuum Source Projected Near HR 8799
Zapata, L. A.; Rodríguez, L. F.
HR 8799 is an A5/F0 V star where exoplanets were first directly imaged. Four exoplanets were found within ≃ 2." 0 from the star. Here we report the VLA detection of a faint (19.1±2.7 µJy) radio continuum (3.0 GHz) source projected at ≃ 2." 2 from the star. The a priori probability of finding a background source with this flux densi…
Thermal Sounding of the Martian Atmosphere Using the ACS TIRVIM FT-IR Spectrometer on Board ExoMars TGO: Method for Solving the Inverse Problem
Fedorova, A. A.; Grassi, D.; Shakun, A. V. +8 more
This paper presents a method for solving the inverse problem of thermal sounding using calibrated data from the ACS TIRVIM experiment on board the ExoMarsTrace Gas Orbiter. The 1.7-17 µm range TIRVIM Fourier spectrometer as part of the ACS instrument complex aboard the ExoMarsTGO operates in the nadir and solar occultation modes in orbit around Ma…
Visit Nearby Halo Substructures Using LAMOST DR9 MRS Data
Zhao, Gang; Zhao, Jing-Kun; Gao, Qi +3 more
Based on the LAMOST DR9 Medium Resolution Spectra (MRS) catalog, combined with astrometries from Gaia DR3, we conducted an investigation into the substructures in the stellar halo to obtain their chemical and kinematic information. We employed the HDBSCAN algorithm in the (L z , E, L xy ) space for clustering and utilized M…
Verification of Astrometrically Accelerating Stars from Hipparcos and Gaia. I. Methodology and Application to HIP 44842
Tokovinin, Andrei; Makarov, Valeri V.
A large number of candidate binary stars with apparent acceleration on the sky has emerged from analysis of astrometric data collected by the Hipparcos, Tycho-2, and Gaia space missions. Although the apparent acceleration can serve as a relatively reliable indicator of binarity, it provides scarce information about the orbital and physical paramet…