Search Publications
Unveiling Subarcsecond Multiplicity in the Pleiades with Gaia Multicolor Photometry
Chulkov, Dmitry
The list of 409 probable cluster members down to G = 15mag (m ≳ 0.5M ⊙) is compiled for the two degree radius of the Pleiades, based on astrometric data from Gaia DR3 and the PPMXL catalog, along with several radial velocity surveys, including APOGEE and LAMOST. This approach allows for the inclusion of binary stars with unre…
Spectral Modeling of the Supersoft X-Ray Source CAL87 Based on Radiative Transfer Codes
Tsujimoto, Masahiro; Wada, Qazuya; Ebisawa, Ken +2 more
Supersoft X-ray sources (SSSs) are white dwarf (WD) binaries that radiate almost entirely below ~1 keV. Their X-ray spectra are often complex when viewed with the X-ray grating spectrometers, where numerous emission and absorption features are intermingled and hard to separate. The absorption features are mostly from the WD atmosphere, for which r…
Jovian Electrons in the Inner Heliosphere: Opportunities for Multi-spacecraft Observations and Modeling
Mitchell, J. G.; Rankin, J. S.; Ferreira, S. E. S. +11 more
In this paper we explore the idea of using multi-spacecraft observations of Jovian electrons to measure the 3D distribution of these particles in the inner heliosphere. We present simulations of Jovian electron intensities along selected spacecraft trajectories for 2021 and compare these, admittedly qualitatively, to these measurements. Using the …
Serendipitous Archival Observations of a New Ultradistant Comet C/2019 E3 (ATLAS)
Weryk, Robert; Hui, Man-To; Micheli, Marco +2 more
We identified a new ultradistant comet C/2019 E3 (ATLAS) exhibiting preperihelion cometary activity at heliocentric distances ≳20 au, making it the fourth member of this population after C/2010 U3 (Boattini), C/2014 UN271 (Bernardinelli–Bernstein), and C/2017 K2 (PANSTARRS). From serendipitous archival data, we conducted analyses of the…
Mapping the Milky Way in 5D with 170 Million Stars
Conroy, Charlie; Ting, Yuan-Sen; Cargile, Phillip A. +18 more
We present Augustus, a catalog of distance, extinction, and stellar parameter estimates for 170 million stars from 14 mag < r < 20 mag and with ∣b∣ > 10° drawing on a combination of optical to near-infrared photometry from Pan-STARRS, 2MASS, UKIDSS, and unWISE along with parallax measurements from Gaia DR2 and 3D dust extinction maps. Aft…
SRG/ART-XC Galactic Bulge deep survey. II. Catalogue of point sources
Sunyaev, R.; Krivonos, R.; Sazonov, S. +20 more
We present a catalogue of point sources detected with the Mikhail Pavlinsky ART-XC telescope onboard the SRG observatory during a wide-field survey of the Galactic Bulge that was conducted as part of the mission's calibration and performance verification phase in 2019. The survey consisted of nearly 18 d of consecutive scanning observations of the…
BP3M: Bayesian Positions, Parallaxes, and Proper Motions Derived from the Hubble Space Telescope and Gaia Data
van der Marel, Roeland P.; Watkins, Laura L.; Libralato, Mattia +9 more
We present a hierarchical Bayesian pipeline, BP3M, that measures positions, parallaxes, and proper motions (PMs) for cross-matched sources between Hubble Space Telescope (HST) images and Gaia—even for sparse fields (N * < 10 per image)—expanding from the recent GaiaHub tool. This technique uses Gaia-measured astrometry as priors to p…
Chemodynamic Analysis of Four r-Process Enhanced Stars Observed with GTC
Sivarani, Thirupathi; Saraf, Pallavi
Here, we delineate a comprehensive abundance analysis of four r-process enhanced metal-poor stars observed with HORuS spectrograph on a 10-m class telescope, GTC. The high signal-to-noise ratio at R≈25000 spectral resolution allowed us to detect 16 light and 20 neutron-capture elements along with Th in two stars. Four of our program stars show sig…
Climatology of gravity wave activity based on two Martian years from ACS/TGO observations
Montmessin, Franck; Starichenko, Ekaterina D.; Belyaev, Denis A. +6 more
Context. Gravity waves redistribute energy and momentum between the lower and upper atmosphere, thus providing vertical coupling between layers, and they affect the state, dynamics, and variability of the upper atmosphere. The statistics of gravity wave activity on Mars is poorly explored but is required in order to characterize the atmospheric ci…
Revisiting the abundance pattern and charge-exchange emission in the centre of M 82
Matsushita, K.; Fukushima, K.; Kobayashi, S. B.
Context. The interstellar medium (ISM) in starburst galaxies contains many chemical elements that are synthesised by core-collapse supernova explosions. By measuring the abundances of these metals, we can study the chemical enrichment within the galaxies and the transportation of metals into the circumgalactic environment through powerful outflows…