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Three-Dimensional Structure of the Corona During WHPI Campaign Rotations CR-2219 and CR-2223
Lamy, P.; Gilardy, H.; Nuevo, F. A. +6 more
Differential emission measure tomography (DEMT) and white light (WL) tomography were applied to study the three-dimensional (3D) structure of the global solar corona for two Whole Heliosphere and Planetary Interactions campaign periods, Carrington rotations 2219 and 2223. With DEMT, Solar Dynamics Observatory/Atmospheric Imaging Assembly images we…
S-PLUS: exploring wide field properties of multiple populations in galactic globular clusters at different metallicities
Chies-Santos, Ana L.; Mendes de Oliveira, Claudia; Bastian, Nate +9 more
Multiple stellar populations (MSPs) are a ubiquitous phenomenon in Galactic globular clusters (GCs). By probing different spectral ranges affected by different absorption lines using the multiband photometric survey S-PLUS, we study four GCs - NGC 104, NGC 288, NGC 3201, and NGC 7089 - that span a wide range of metallicities. With the combination …
Gaia 0007-1605: An Old Triple System with an Inner Brown Dwarf-White Dwarf Binary and an Outer White Dwarf Companion
Rebassa-Mansergas, Alberto; Raddi, Roberto; Torres, Santiago +5 more
We identify Gaia 0007-1605 A,C as the first inner brown dwarf-white dwarf binary of a hierarchical triple system in which the outer component is another white dwarf (Gaia 0007-1605 B). From optical/near-infrared spectroscopy obtained at the Very Large Telescope with the X-Shooter instrument and/or from Gaia photometry plus spectral energy distribu…
Gap Opening and Inner Disk Structure in the Strongly Accreting Transition Disk of DM Tau
Dong, Ruobing; Johnstone, Doug; Liu, Hauyu Baobab +7 more
Large inner dust gaps in transition disks are frequently posited as evidence of giant planets sculpting gas and dust in the disk, or the opening of a gap by photoevaporative winds. Although the former hypothesis is strongly supported by the observations of planets and deep depletions in gas within the gap in some disks, many T Tauri stars hosting …
The Gaia-ESO Survey: Probing the lithium abundances in old metal-rich dwarf stars in the solar vicinity
Gilmore, G.; Guiglion, G.; Chiappini, C. +14 more
Context. Lithium (Li) is a fragile element that is produced in a variety of sites but can also be very easily depleted in stellar photospheres. Radial migration has been reported to explain the decrease in the upper envelope of Li measurements observed for relatively old metal-rich dwarf stars in some surveys.
Aims: We test a scenario in whic…
Revised Stellar Parameters for V471 Tau, A Post-common Envelope Binary in the Hyades
Drout, Maria R.; Muirhead, Philip S.; Nordhaus, Jason
V471 Tau is a post-common-envelope binary consisting of an eclipsing DA white dwarf and a K-type main-sequence star in the Hyades star cluster. We analyzed publicly available photometry and spectroscopy of V471 Tau to revise the stellar and orbital parameters of the system. We used archival K2 photometry, archival Hubble Space Telescope spectrosco…
Impact of point spread function higher moments error on weak gravitational lensing
Mandelbaum, Rachel; LSST Dark Energy Science Collaboration; Zhang, Tianqing
Weak gravitational lensing is one of the most powerful tools for cosmology, while subject to challenges in quantifying subtle systematic biases. The point spread function (PSF) can cause biases in weak lensing shear inference when the PSF model does not match the true PSF that is convolved with the galaxy light profile. Although the effect of PSF …
Chemo-dynamics and asteroseismic ages of seven metal-poor red giants from the Kepler field
Monty, Stephanie; Freeman, Ken C.; Stello, Dennis +5 more
In this work, we combine information from solar-like oscillations, high-resolution spectroscopy, and Gaia astrometry to derive stellar ages, chemical abundances, and kinematics for a group of seven metal-poor red giants and characterize them in a multidimensional chrono-chemo-dynamical space. Chemical abundance ratios were derived through classica…
Thermal Structure of the Middle and Upper Atmosphere of Mars From ACS/TGO CO2 Spectroscopy
Montmessin, F.; Fedorova, A. A.; Olsen, K. S. +6 more
Temperature and density in the upper Martian atmosphere, above ∼100 km, are key diagnostic parameters to study processes of the species' escape, investigate the impact of solar activity, model the atmospheric circulation, and plan spacecraft descent or aerobraking maneuvers. In this paper, we report vertical profiling of carbon dioxide (CO2
Far-ultraviolet to FIR Spectral-energy Distribution Modeling of the Stellar Formation History of the M31 Bulge
Leahy, Denis; Leahy, Cameron; Seminoff, Noah
M31 is being surveyed at far- and near-ultraviolet with the UVIT telescope on AstroSat. The central bulge of M31 was observed in the N279N (275-280 nm), N219M (200-240 nm), F172M (160-185 nm), F169M (145-175 nm), and F148W (120-180 nm) filters. These images are made publicly available here. The UVIT data are supplemented with Sloan Digital Sky Sur…