Search Publications
Dust Unveils the Formation of a Mini-Neptune Planet in a Protoplanetary Ring
Dong, Ruobing; Baruteau, Clément; Pérez, Sebastián +3 more
Rings and radial gaps are ubiquitous in protoplanetary disks, yet their possible connection to planet formation is currently subject to intense debates. In principle, giant planet formation leads to wide gaps that separate the gas and dust mass reservoir in the outer disk, while lower mass planets lead to shallow gaps that are manifested mainly on…
Comprehensive comparison of models for spectral energy distributions from 0.1 µm to 1 mm of nearby star-forming galaxies
Helou, G.; Ciesla, L.; Boquien, M. +26 more
We have fit the far-ultraviolet (FUV) to sub-millimeter (850 µm) spectral energy distributions (SEDs) of the 61 galaxies from the Key Insights on Nearby Galaxies: A Far-Infrared Survey with Herschel (KINGFISH). The fitting has been performed using three models: the Code for Investigating GALaxy Evolution (CIGALE), the GRAphite-SILicate appro…
Hot Jupiters Are Destroyed by Tides While Their Host Stars Are on the Main Sequence
Schlaufman, Kevin C.; Hamer, Jacob H.
While cooler giant planets are often observed with nonzero eccentricities, the short-period circular orbits of hot Jupiters suggest that they lose orbital energy and angular momentum due to tidal interactions with their host stars. However, orbital decay has never been unambiguously observed. We use data from Gaia Data Release 2 to show that hot J…
The Inside-out Growth of the Galactic Disk
Ting, Yuan-Sen; Rix, Hans-Walter; Ness, Melissa +2 more
We quantify the inside-out growth of the Milky Way’s low-α stellar disk, modeling the ages, metallicities, and Galactocentric radii of APOGEE red clump stars with 6 kpc < R < 13 kpc. The current stellar distribution differs significantly from that expected from the star formation history due to the redistribution of stars through radial orbi…
Proper Motions of Milky Way Ultra-faint Satellites with Gaia DR2 × DES DR1
Li, Ting S.; Pace, Andrew B.
We present a new, probabilistic method for determining the systemic proper motions of Milky Way (MW) ultra-faint satellites in the Dark Energy Survey (DES). We utilize the superb photometry from the first public data release (DR1) of the DES to select candidate members and cross-match them with the proper motions from the Gaia DR2. We model the ca…
Systematic Variations of CO Gas Abundance with Radius in Gas-rich Protoplanetary Disks
Zhang, Ke; Bergin, Edwin A.; Krijt, Sebastiaan +2 more
CO is the most widely used gas tracer of protoplanetary disks. Its abundance is usually assumed to be an interstellar ratio throughout the warm molecular layer of the disk. But recent observations of low CO gas abundance in many protoplanetary disks challenge our understanding of physical and chemical evolutions in disks. Here we investigate the C…
Mapping the Magnetic Interstellar Medium in Three Dimensions over the Full Sky with Neutral Hydrogen
Hensley, Brandon S.; Clark, S. E.
Recent analyses of 21 cm neutral hydrogen (H I) emission have demonstrated that H I gas is organized into linear filamentary structures that are preferentially aligned with the local magnetic field, and that the coherence of these structures in velocity space traces line-of-sight magnetic field tangling. On this basis, we introduce a paradigm for …
ALMA survey of Class II protoplanetary disks in Corona Australis: a young region with low disk masses
Tamura, M.; Galván-Madrid, R.; Testi, L. +20 more
Context. In recent years, the disk populations in a number of young star-forming regions have been surveyed with the Atacama Large Millimeter/submillimeter Array (ALMA). Understanding the disk properties and their correlation with the properties of the central star is critical to understanding planet formation. In particular, a decrease of the ave…
HAWC+/SOFIA Multiwavelength Polarimetric Observations of OMC-1
Morris, Mark R.; Staguhn, Johannes; Ward-Thompson, Derek +36 more
We report new polarimetric and photometric maps of the massive star-forming region OMC-1 using the HAWC+ instrument on the Stratospheric Observatory for Infrared Astronomy. We present continuum polarimetric and photometric measurements of this region at 53, 89, 154, and 214 µm at angular resolutions of 5″, 8″, 14″, and 19″ for the four bands…
Kiloparsec Scale Properties of Star Formation Driven Outflows at z ∼ 2.3 in the SINS/zC-SINF AO Survey
Lutz, D.; Wuyts, S.; Förster Schreiber, N. M. +19 more
We investigate the relationship between star formation activity and outflow properties on kiloparsec scales in a sample of 28 star-forming galaxies at z ∼ 2-2.6, using adaptive optics assisted integral field observations from SINFONI on the Very Large Telescope. The narrow and broad components of the Hα emission are used to simultaneously determin…