Search Publications
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…
Kelvin-Helmholtz Vortices as an Interplay of Magnetosphere-Ionosphere Coupling
Russell, C. T.; Escoubet, C. P.; Torbert, R. B. +11 more
The solar wind-magnetosphere interaction drives diverse physical processes on the flanks of Earth's magnetopause, and in turn these processes couple to the ionosphere. We investigate simultaneous multipoint in-situ spacecraft and ground-based measurements to determine the role of Kelvin-Helmholtz waves at the Earth's magnetopause and the low-latit…
A Jupiter Analog Orbiting The Nearby M Dwarf GJ 463
Cochran, William D.; Endl, Michael; Howard, Andrew W. +8 more
We report the detection of a long-period giant planetary companion to the nearby M3V star GJ 463 (=Ross 690). The detection is based on over ten years of highly-precise radial velocity measurements with the High Resolution Spectrograph at the Hobby-Eberly Telescope and the HIRES spectrograph at Keck. With an orbital period of 10 yr and a minimum m…
Determining Star Formation Rates of Active Galactic Nucleus Host Galaxies Based on SED Fitting with Submillimeter Data
Jadhav, Yashashree; Hwang, Ho Seong; Luo, Rongxin +9 more
We present the star formation rate (SFR) measurements based on the spectral energy distribution (SED) analysis with new submillimeter fluxes combined with archival multiwavelength data for a sample of 52 active galactic nucleus (AGN) host galaxies at z < 0.2. We carried out submillimeter observations using the SCUBA-2 camera at the James Clerk …