Search Publications
Molecular Line Observations in Two Dusty Star-forming Galaxies at z = 6.9
Greve, Thomas R.; Phadke, Kedar A.; Aravena, Manuel +18 more
SPT0311-58 is the most massive infrared luminous system discovered so far during the Epoch of Reionization (EoR). In this paper, we present a detailed analysis of the molecular interstellar medium at z = 6.9, through high resolution observations of the CO(6-5), CO(7-6), CO(10-9), [C I](2-1), and p-H2O(21,1 -20,2) l…
Tracking the Evolution of Lithium in Giants Using Asteroseismology: Super-Li-rich Stars Are Almost Exclusively Young Red-clump Stars
Vrard, Mathieu; Campbell, Simon W.; Reddy, Bacham E. +2 more
We report novel observational evidence on the evolutionary status of lithium-rich giant stars by combining asteroseismic and lithium abundance data. Comparing observations and models of the asteroseismic gravity-mode period spacing ΔΠ1, we find that super-Li-rich giants (SLRs, A(Li) > 3.2 dex) are almost exclusively young red-clump (…
Membership Lists for 431 Open Clusters in Gaia DR2 Using Extreme Deconvolution Gaussian Mixture Models
Jaehnig, Karl; Holley-Bockelmann, Kelly; Bird, Jonathan
Open clusters are groups of stars that form at the same time, making them an ideal laboratory to test theories of star formation, stellar evolution, and dynamics in the Milky Way disk. However, the utility of an open cluster can be limited by the accuracy and completeness of its known members. Here, we employ a "top-down" technique, Extreme Deconv…
Kinematics of the Circumgalactic Medium of a z = 0.77 Galaxy from Mg II Tomography
Faucher-Giguère, Claude-André; Sanders, Ryan L.; Stark, Daniel P. +5 more
Galaxy evolution is thought to be driven in large part by the flow of gas between galaxies and the circumgalactic medium (CGM), a halo of metal-enriched gas extending out to ≳100 kpc from each galaxy. Studying the spatial structure of the CGM holds promise for understanding these gas flow mechanisms; however, the common method of using background …
Gaia Gaps and the Physics of Low-mass Stars. I. The Fully Convective Boundary
Jao, Wei-Chun; Feiden, Gregory A.; Skidmore, Khian
The Gaia M-dwarf gap is a significant underdensity of stars observed near MG = 10.2 in a color-magnitude diagram for stars within 200 pc of the Sun. It has been proposed that the gap is the manifestation of structural instabilities within stellar interiors due to nonequilibrium 3He fusion prior to some stars becoming fully co…
A Model for the Coupled Eruption of a Pseudostreamer and Helmet Streamer
Lynch, B. J.; Antiochos, S. K.; Kumar, P. +3 more
A highly important aspect of solar activity is the coupling between eruptions and the surrounding coronal magnetic field topology, which determines the trajectory and morphology of the event and can even lead to sympathetic eruptions from multiple sources. In this paper, we report on a numerical simulation of a new type of coupled eruption, in whi…
Molecular Gas Filaments and Fallback in the Ram Pressure Stripped Coma Spiral NGC 4921
Tonnesen, S.; Smith, R.; Cramer, W. J. +6 more
We investigate the effects of ram pressure on the molecular interstellar medium (ISM) in the disk of the Coma cluster galaxy NGC 4921 via high-resolution CO observations. We present 6″ resolution CARMA CO(1-0) observations of the full disk, and 0"4 resolution Atacama Large Millimeter/submillimeter Array CO(2-1) observations of the leading quadrant…
The Sample of Red Supergiants in 12 Low-mass Galaxies of the Local Group
Yang, Ming; Ren, Yi; Jiang, Biwei +2 more
This work establishes the most complete sample of red supergiants (RSGs) in 12 low-mass galaxies (WLM, IC 10, NGC 147, NGC 185, IC 1613, Leo A, Sextans B, Sextans A, NGC 6822, Pegasus Dwarf, SMC, and LMC) of the Local Group, which forms a solid basis to study the properties of RSGs as well as the star formation rate and initial mass function of th…
Vertical Phase Mixing across the Galactic Disk
Li, Zhao-Yu
By combining the Large Sky Area Multi-object Fiber Spectroscopic Telescope and Gaia data, we investigate the vertical phase mixing across the Galactic disk. Our results confirm the existence of phase space snail shells (or phase spirals) from 6-12 kpc. We find that grouping stars by the guiding radius (Rg), instead of the present radius…
TOI-3362b: A Proto Hot Jupiter Undergoing High-eccentricity Tidal Migration
Triaud, Amaury H. M. J.; Latham, David W.; Quinn, Samuel N. +39 more
High-eccentricity tidal migration is a possible way for giant planets to be placed in short-period orbits. If this happens often, one would expect to catch proto hot Jupiters on highly elliptical orbits undergoing high-eccentricity tidal migration. As of yet, few such systems have been discovered. Here, we introduce TOI-3362b (TIC-464300749b), an …