Search Publications
A Multifrequency ALMA Characterization of Substructures in the GM Aur Protoplanetary Disk
Wilner, David J.; Andrews, Sean M.; Huang, Jane +12 more
The protoplanetary disk around the T Tauri star GM Aur was one of the first hypothesized to be in the midst of being cleared out by a forming planet. As a result, GM Aur has had an outsized influence on our understanding of disk structure and evolution. We present 1.1 and 2.1 mm ALMA continuum observations of the GM Aur disk at a resolution of ∼50…
COLDz: A High Space Density of Massive Dusty Starburst Galaxies ∼1 Billion Years after the Big Bang
Dickinson, Mark; Smail, Ian; Daddi, Emanuele +15 more
We report the detection of CO(J = 2 → 1) emission from three massive dusty starburst galaxies at z > 5 through molecular line scans in the NSF's Karl G. Jansky Very Large Array (VLA) CO Luminosity Density at High Redshift (COLDz) survey. Redshifts for two of the sources, HDF 850.1 (z = 5.183) and AzTEC-3 (z = 5.298), were previously known. We r…
Spiral arms in the protoplanetary disc HD100453 detected with ALMA: evidence for binary-disc interaction and a vertical temperature gradient
Dominik, C.; Benisty, M.; Stolker, T. +7 more
Scattered light high-resolution imaging of the protoplanetary disc orbiting HD100453 shows two symmetric spiral arms, possibly launched by an external stellar companion. In this paper, we present new, sensitive high-resolution (∼30 mas) Band 7 ALMA observations of this source. This is the first source where we find counterparts in the sub-mm conti…
Morpheus: A Deep Learning Framework for the Pixel-level Analysis of Astronomical Image Data
Hausen, Ryan; Robertson, Brant E.
We present Morpheus, a new model for generating pixel-level morphological classifications of astronomical sources. Morpheus leverages advances in deep learning to perform source detection, source segmentation, and morphological classification pixel-by-pixel via a semantic segmentation algorithm adopted from the field of computer vision. By utilizi…
A physically motivated definition for the size of galaxies in an era of ultradeep imaging
Trujillo, Ignacio; Knapen, Johan H.; Chamba, Nushkia
Present-day multiwavelength deep imaging surveys allow to characterize the outskirts of galaxies with unprecedented precision. Taking advantage of this situation, we define a new physically motivated measurement of size for galaxies based on the expected location of the gas density threshold for star formation. Employing both theoretical and obser…
Equatorial retrograde flow in WASP-43b elicited by deep wind jets?
Henning, Thomas; Mollière, Paul; Carone, Ludmila +6 more
We present WASP-43b climate simulations with deep wind jets (down to 700 bar) that are linked to retrograde (westward) flow at the equatorial day side for p < 0.1 bar. Retrograde flow inhibits efficient eastward heat transport and naturally explains the small hotspot shift and large day-night-side gradient of WASP-43b (Porb = Pr…
In-flight calibration of the Insight-Hard X-ray Modulation Telescope
Zhang, Shu; Li, Xiaobo; Tuo, Youli +19 more
We present the calibration of the Insight-Hard X-ray Modulation Telescope (Insight-HXMT) X-ray satellite, which can be used to perform timing and spectral studies of bright X-ray sources. Insight-HXMT carries three main payloads onboard: the High Energy X-ray telescope (HE), the Medium Energy X-ray telescope (ME) and the low Energy X-ray telescope…
Evidence for a vast prograde stellar stream in the solar vicinity
Hopkins, Philip F.; Sanderson, Robyn; Wetzel, Andrew +6 more
Massive dwarf galaxies that merge with the Milky Way on prograde orbits can be dragged into the disk plane before being completely disrupted. Such mergers can contribute to an accreted stellar disk and a dark matter disk. Here we present Nyx, a vast stellar stream in the vicinity of the Sun, which provides the first indication that such an event o…
The carbon monoxide-rich interstellar comet 2I/Borisov
Feldman, P. D.; Bodewits, D.; Noonan, J. W. +7 more
Interstellar comets offer direct samples of volatiles from distant protoplanetary disks. 2I/Borisov is the first notably active interstellar comet discovered in our Solar System1. Comets are condensed samples of the gas, ice and dust that were in a star's protoplanetary disk during the formation of its planets, and inform our understand…
A low-mass planet candidate orbiting Proxima Centauri at a distance of 1.5 AU
Butler, R. Paul; Jenkins, James S.; Anglada-Escudé, Guillem +18 more
Our nearest neighbor, Proxima Centauri, hosts a temperate terrestrial planet. We detected in radial velocities evidence of a possible second planet with minimum mass mc sin ic = 5.8 ± 1.9 M⊕ and orbital period Pc = 5.21+0.26-0.22 years. The analysis of photometric data and spectrosc…