Search Publications
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…
INTEGRAL x-ray constraints on sub-GeV dark matter
Pinetti, Elena; Fornengo, Nicolao; Cirelli, Marco +1 more
Light dark matter (DM), defined here as having a mass between 1 MeV and about 1 GeV, is an interesting possibility both theoretically and phenomenologically, at one of the frontiers of current progress in the field of DM searches. Its indirect detection via gamma rays is challenged by the scarcity of experiments in the MeV-GeV region. We look ther…
Star formation and nuclear activity in luminous infrared galaxies: an infrared through radio review
Aalto, Susanne; Alonso-Herrero, Almudena; Mattila, Seppo +2 more
Nearby galaxies offer unique laboratories allowing multi-wavelength spatially resolved studies of the interstellar medium, star formation and nuclear activity across a broad range of physical conditions. In particular, detailed studies of individual local luminous infrared galaxies (LIRGs) are crucial for gaining a better understanding of these pr…
Milky Way Mid-Infrared Spitzer Spectroscopic Extinction Curves: Continuum and Silicate Features
Gordon, Karl D.; Hines, Dean C.; Bouwman, Jeroen +7 more
We measured the mid-infrared (MIR) extinction using Spitzer photometry and spectroscopy (3.6-37 µm) for a sample of Milky Way sight lines (mostly) having measured ultraviolet extinction curves. We used the pair method to determine the MIR extinction that we then fit with a power law for the continuum and modified Drude profiles for the silic…
TESS Observations of the WASP-121 b Phase Curve
Mikal-Evans, Thomas; Sing, David K.; Kane, Stephen R. +23 more
We study the red-optical photometry of the ultrahot Jupiter WASP-121 b as observed by the Transiting Exoplanet Survey Satellite (TESS) and model its atmosphere through a radiative transfer simulation. Given its short orbital period of ∼1.275 days, inflated state, and bright host star, WASP-121 b is exceptionally favorable for detailed atmospheric …