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Surface brightness-colour relations of dwarf stars from detached eclipsing binaries. I. Calibrating sample
Kervella, P.; Maxted, P. F. L.; Southworth, J. +19 more
Aims: Surface brightness - colour relations (SBCRs) are very useful tools for predicting the angular diameters of stars. They offer the possibility to calculate very precise spectrophotometric distances by the eclipsing binary method or the Baade-Wesselink method. Double-lined Detached Eclipsing Binary stars (SB2 DEBs) with precisely known tr…
Evidence of Alfvén Waves Generated by Mode Coupling in the Magnetotail Lobe
Zhang, Tielong; Sun, Jicheng; Wang, Guoqiang +2 more
Mode coupling is an important mechanism to excite Alfvén waves and has been extensively investigated based on numerical simulations. However, no direct observational evidence has been found regarding to this mechanism in the magnetotail lobe. Here, we report an in-situ observation that an Alfvén wave with a period of several minutes is clearly rel…
Radiation from cold molecular clouds and Sun chromosphere produced by antiquark nugget dark matter
Flambaum, V. V.; Samsonov, I. B.
We study the astrophysical implications of the quark nugget model of dark matter and propose observational techniques for detecting antiquark nuggets (anti-QNs) with modern telescopes. Anti-QNs are compact composite objects of antiquark matter with a typical radius R ∼10-5 cm and density exceeding that of nuclear matter. Atoms and molec…
Spectral Evolution of Ultraluminous X-Ray Pulsar NGC 300 ULX-1
Steiner, James F.; Remillard, Ronald A.; Chakrabarty, Deepto +2 more
We report on results from a 1 yr soft X-ray observing campaign of the ultraluminous X-ray pulsar NGC 300 ULX-1 by the Neutron star Interior Composition Explorer (NICER) during 2018-2019. Our analysis also made use of data from Swift/XRT and XMM-Newton in order to model and remove contamination from the nearby eclipsing X-ray binary NGC 300 X-1. We…
Gaia-TESS synergy: improving the identification of transit candidates
Latham, David W.; Collins, Karen A.; Mazeh, Tsevi +5 more
Context. The TESS team periodically issues a new list of transiting exoplanet candidates based on the analysis of the accumulating light curves obtained by the satellite. The list includes the estimated epochs, periods, and durations of the potential transits. As the point spread function (PSF) of TESS is relatively wide, follow-up photometric obs…
Modelling the flare in NGC 1097 from 1991 to 2004 as a tidal disruption event
Zhang, Xue-Guang
In the letter, interesting evidence is reported to support a central tidal disruption event (TDE) in the known AGN NGC 1097. Considering the motivations of TDE as one probable origination of emission materials of double-peaked broad emission lines and also as one probable explanation to changing-look AGN, it is interesting to check whether there a…
Tracking the Evolution of an Ocean Within Mimas Using the Herschel Impact Basin
Rhoden, A. R.; Denton, C. A.
Mimas' small size, lack of geologic activity, and high eccentricity suggest a frozen, inactive history. However, Cassini libration measurements are best explained by a present-day liquid ocean under an ice shell 24-31 km thick, a configuration that tidal heating can support. These unexpected findings have motivated further study of Mimas' surface …
Investigation of the homogeneity of energy conversion processes at dipolarization fronts from MMS measurements
Russell, C. T.; Lavraud, B.; Anderson, B. J. +28 more
We report on six dipolarization fronts (DFs) embedded in fast earthward flows detected by the Magnetospheric Multiscale mission during a substorm event on 23 July 2017. We analyzed Ohm's law for each event and found that ions are mostly decoupled from the magnetic field by Hall fields. However, the electron pressure gradient term is also contribut…
Stellar collisions in globular clusters: Constraints on the initial mass function of the first generation of stars
Dib, Sami; Haghi, Hosein; Zonoozi, Akram Hasani +2 more
Globular clusters display an anticorrelation between the fraction of the first generation of stars (N(G1)/N(tot)) and the slope of the present-day mass function of the clusters (αpd), which is particularly significant for massive clusters. In the framework of the binary-mediated collision scenario for the formation of the second-generat…
Linear Nash-Greene fluctuations on the evolution of S 8 H 0
Capistrano, Abraão J. S.; Cabral, Luís A.; Marão, José A. P. F. +1 more
We present the perturbation equations in an embedded four space-time from the linear Nash-Greene fluctuations of background metric. In the context of a five-dimensional bulk, we show that the cosmological perturbations are only propagated by the gravitational tensorial field equation. In Newtonian conformal gauge, we study the matter density evolu…