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The Alma catalogue of OB stars - II. A cross-match with Gaia DR2 and an updated map of the solar neighbourhood
Maíz Apellániz, J.; Barbá, R. H.; Pantaleoni González, M. +1 more
We cross-match the Alma catalogue of OB stars with Gaia DR2 astrometry and photometry as a first step towards producing a clean sample of massive stars in the solar neighbourhood with a high degree of completeness. We analyse the resulting colour-absolute magnitude diagram to divide our sample into categories and compare extinction estimates from …
Diving Beneath the Sea of Stellar Activity: Chromatic Radial Velocities of the Young AU Mic Planetary System
Barclay, Thomas; Latham, David W.; Quinn, Samuel N. +52 more
We present updated radial-velocity (RV) analyses of the AU Mic system. AU Mic is a young (22 Myr) early-M dwarf known to host two transiting planets-P b ~ 8.46 days, ${R}_{b}={4.38}_{-0.18}^{+0.18}\ {R}_{\oplus }$ , P c ~ 18.86 days, ${R}_{c}={3.51}_{-0.16}^{+0.16}\ {R}_{\oplus }$ . With visible RVs from Calar Alto high-R…
Evolution of Stellar Feedback in H II Regions
Bolatto, Alberto D.; Reiter, Megan; Lopez, Laura A. +4 more
Stellar feedback is needed to produce realistic giant molecular clouds and galaxies in simulations, but due to limited numerical resolution, feedback must be implemented using sub-grid models. Observational work is an important means to test and anchor these models, but limited studies have assessed the relative dynamical role of multiple feedback…
Improving Damped Random Walk Parameters for SDSS Stripe 82 Quasars with Pan-STARRS1
Ivezić, Željko; MacLeod, Chelsea; Suberlak, Krzysztof L.
We use the Panoramic Survey Telescope and Rapid Response System 1 Survey (Pan-STARRS1, PS1) data to extend the Sloan Digital Sky Survey (SDSS) Stripe 82 quasar light curves. Combining PS1 and SDSS light curves provides a 15 yr baseline for 9248 quasars—5 yr longer than prior studies that used only SDSS. We fit the light curves with the damped rand…
Broken into Pieces: ATLAS and Aliqa Uma as One Single Stream
Lewis, Geraint F.; Hattori, Kohei; Erkal, Denis +18 more
We present the first spectroscopic measurements of the ATLAS and Aliqa Uma streams from the Southern Stellar Stream Spectroscopic Survey (S5), in combination with the photometric data from the Dark Energy Survey and astrometric data from Gaia. From the coherence of spectroscopic members in radial velocity and proper motion, we find that…
Convolutional neural network identification of galaxy post-mergers in UNIONS using IllustrisTNG
Ellison, Sara L.; Gwyn, Stephen; Hudson, Michael J. +6 more
The Canada-France Imaging Survey (CFIS) will consist of deep, high-resolution r-band imaging over ~5000 deg2 of the sky, representing a first-rate opportunity to identify recently merged galaxies. Because of the large number of galaxies in CFIS, we investigate the use of a convolutional neural network (CNN) for automated merger classifi…
Spiral Arms and a Massive Dust Disk with Non-Keplerian Kinematics: Possible Evidence for Gravitational Instability in the Disk of Elias 2-27
Lodato, G.; Pinte, C.; Testi, L. +16 more
To determine the origin of the spiral structure observed in the dust continuum emission of Elias 2-27 we analyze multiwavelength continuum ALMA data with a resolution of ~0"2 (~23 au) at 0.89, 1.3, and 3.3 mm. We also study the kinematics of the disk with 13CO and C18O ALMA observations in the J = 3-2 transition. The spiral a…
A "Quick Look" at All-sky Galactic Archeology with TESS: 158,000 Oscillating Red Giants from the MIT Quick-look Pipeline
Huber, Daniel; Sharma, Sanjib; Stello, Dennis +6 more
We present the first near all-sky yield of oscillating red giants from the prime mission data of NASA's Transiting Exoplanet Survey Satellite (TESS). We apply machine learning toward long-cadence TESS photometry from the first data release by the MIT Quick-look Pipeline to automatically detect the presence of red giant oscillations in frequency po…
3D simulations of photochemical hazes in the atmosphere of hot Jupiter HD 189733b
Showman, Adam P.; Zhang, Xi; Tan, Xianyu +3 more
Photochemical hazes have been suggested as candidate for the high-altitude aerosols observed in the transmission spectra of many hot Jupiters. We present 3D simulations of the hot Jupiter HD 189733b to study how photochemical hazes are transported by atmospheric circulation. The model includes spherical, constant-size haze particles that gravitati…
Multiwavelength continuum sizes of protoplanetary discs: scaling relations and implications for grain growth and radial drift
Testi, L.; Tazzari, M.; Natta, A. +5 more
We analyse spatially resolved ALMA observations at 0.9, 1.3, and 3.1 mm for the 26 brightest protoplanetary discs in the Lupus star-forming region. We characterize the discs multiwavelength brightness profiles by fitting the interferometric visibilities in a homogeneous way, obtaining effective disc sizes at the three wavelengths, spectral index p…