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An Improved Pair Method to Probe the Dust Extinction Law
Gao, Jian; Ren, Yi; Wang, Yuxi +1 more
Dust extinction law is crucial to recover the intrinsic energy distribution of celestial objects and infer the characteristics of interstellar dust. Based on the traditional pair method, an improved pair method is proposed to model the dust extinguished spectral energy distribution (SED) of an individual star. Instead of the mathematically paramet…
Titan's North-South Haze Asymmetry Ratio and Boundary at Visible Wavelengths over the Cassini Mission
Barnes, Jason W.; Lorenz, Ralph D.; Vashist, Aadvik S. +2 more
We document the evolution of the north-south asymmetry (NSA) of Titan's haze albedo during the Cassini mission between 2004 and 2017. We analyze coadded cube images taken at 96 distinct wavelengths between 0.35 and 1.05 µm by the Cassini Visual and Infrared Mapping Spectrometer (VIMS-V) instrument from 14 Titan flybys. Over half of a Titan y…
The Interstellar Ti II Distance Scale
Krełowski, J.; Galazutdinov, G. A.; Santander, T. A. +1 more
We measured the equivalent widths (
Kepler, K2, and TESS observations: ensemble and comparative asteroseismology
Reed, M. D.; Jeffery, C. S.; Baran, A. S. +2 more
The original Kepler mission detected 18 pulsating subdwarf B (sdBV) stars, K2 observed 161 of our proposed targets with 41 sdB stars found to show p- or g-mode pulsations, and TESS has observed about 1,000 of our proposed targets. All these data should provide ∼300 sdBV stars, from which asteroseismology will provide a host of measurables. Combine…
TYC 1417-891-1 and TYC 1478-742-1: Eclipsing variable stars. The Gaia EDR3 and TESS photometric data.
Gigoyan, K. K.; Gigoyan, K. S.; Kostandyan, G. R.
Based on the TESS (Transiting Exoplanet Survey Satellite) phase dependent light curves, we confirm the eclipsing type variability nature for two G - type dwarfs: TYC 1417-891-1 and TYC 1478-742-1. Both objects show EA (Algol - type) light curves morphology. Orbital period for TYC 1417-891-1 is P ≈ 8.0 day and for TYC 1478-742-1, P ≈ 13.6 day. We p…
The Structure of the Warped Io Plasma Torus Constrained by the Io Footprint
Saur, Joachim; Schlegel, Stephan
Standard models of force balance along Jovian field lines predict the location of the Io Plasma Torus to be the centrifugal equator of Jupiter's magnetosphere, that is, the position along the magnetic field lines farthest away from Jupiter's rotational axis. In many models, the centrifugal equator is assumed to lay on a plane, calculated from a (s…
Confirmation and characterization of neglected WDS systems using Gaia data release 3 and the virtual observatory
Cortés-Contreras, M.; Solano, E.; Rodrigo, C. +2 more
The aim of this article is making use of the Gaia DR3 catalogue and virtual observatory tools, to confirm and characterize 428 binary and multiple stellar systems classified as neglected (only one observation) in the Washington Double Star Catalogue (WDS). The components of the stellar systems have the same parallax and proper motion (within the e…
Probing the Variation of Reverberation Lags along with X-Ray Flux in the AGN Mrk 704
Sriram, K.; Choi, C. S.; Agrawal, Vivek K. +2 more
Understanding the variation of lags with respect to the X-ray flux is important to explore the geometry of the inner region of the accretion disk in AGNs. We performed frequency-lag, energy-lag and spectral studies for two sets of observations, in order to investigate the variations in lags with respect to X-ray flux in the AGN source Mrk 704 usin…
Soft excess in AGN with relativistic X‑ray reflection
Mathew, Blesson; Dewangan, Gulab C.; Ezhikode, Savithri H. +1 more
The soft X‑ray excess, emission below 2 keV over the X‑ray power‑law, is a marked spectral component in the X‑ray spectra of many Seyfert 1 galaxies. We investigate if the observed soft X‑ray excess in a sample of Seyfert 1s is in accordance with the prediction of the relativistic reflection model by analyzing the XMM‑Newton and NuSTAR spectra. Th…
XGAPS: a sub-arcsec cross-match of galactic plane surveys
Knigge, C.; Groot, P. J.; Monguió, M. +5 more
We present a sub-arcsec cross-match of Gaia Data Release 3 (DR3) against the INT Galactic Plane Surveys (IGAPS) and the United Kingdom Infrared Deep Sky Survey (UKIDSS). The resulting cross-match of Galactic Plane Surveys (XGAPS) provides additional precise photometry (URGO, g, r, i, Hα, J, H, and K) to the Gaia photometry. In building …