Search Publications
Scientific Domain Knowledge Improves Exoplanet Transit Classification with Deep Learning
Jenkins, Jon M.; Ansdell, Megan; Osborn, Hugh P. +8 more
Space-based missions such as Kepler, and soon the Transiting Exoplanet Survey Satellite (TESS), provide large data sets that must be analyzed efficiently and systematically. Recent work by Shallue & Vanderburg successfully used state-of-the-art deep learning models to automatically classify Kepler transit signals as either exoplanets or false …
Multiple Rings in the Transitional Disk of GM Aurigae Revealed by VLA and ALMA
Schwarz, Kamber R.; Carrasco-González, Carlos; Ribas, Álvaro +6 more
Our understanding of protoplanetary disks is rapidly departing from the classical view of a smooth, axisymmetric disk. This is in part thanks to the high angular resolution that (sub)millimeter observations can provide. Here, we present the combined results of Atacama Large Millimeter/submillimeter Array (ALMA) (0.9 mm) and Very Large Array (VLA) …
Properties and Occurrence Rates for Kepler Exoplanet Candidates as a Function of Host Star Metallicity from the DR25 Catalog
Henning, Thomas; Mathew, Blesson; Manoj, P. +5 more
Correlations between the occurrence rate of exoplanets and their host star properties provide important clues about the planet formation process. We studied the dependence of the observed properties of exoplanets (radius, mass, and orbital period) as a function of their host star metallicity. We analyzed the planetary radii and orbital periods of …
Aurigaia: mock Gaia DR2 stellar catalogues from the AURIGA cosmological simulations
Springel, Volker; Grand, Robert J. J.; Gómez, Facundo A. +12 more
We present and analyse mock stellar catalogues that match the selection criteria and observables (including uncertainties) of the Gaia satellite data release 2 (DR2). The source are six cosmological high-resolution magneto-hydrodynamic ΛCDM zoom simulations of the formation of Milky Way analogues from the AURIGA project. Mock data are provided for…
A new method to identify subclasses among AGB stars using Gaia and 2MASS photometry
Mowlavi, N.; Lecoeur-Taïbi, I.; Lebzelter, T. +4 more
Aims: We explore the wealth of high-quality photometric data provided by data release 2 (DR2) of the Gaia mission for long-period variables (LPVs) in the Large Magellanic Cloud (LMC). Our goal is to identify stars of various types and masses along the asymptotic giant branch.
Methods: For this endeavour, we developed a new multi-band app…
A New Tool for CME Arrival Time Prediction using Machine Learning Algorithms: CAT-PUMA
Wang, Yuming; Shen, Chenglong; Liu, Jiajia +2 more
Coronal mass ejections (CMEs) are arguably the most violent eruptions in the solar system. CMEs can cause severe disturbances in interplanetary space and can even affect human activities in many aspects, causing damage to infrastructure and loss of revenue. Fast and accurate prediction of CME arrival time is vital to minimize the disruption that C…
Spectroscopic Observations of a Current Sheet in a Solar Flare
Feng, L.; Gan, W. Q.; Cheng, X. +6 more
The current sheet is believed to be the region of energy dissipation via magnetic reconnection in solar flares. However, its properties, for example, the dynamic process, are not fully understood. Here, we report a current sheet in a solar flare (SOL2017-09-10T16:06) that was clearly observed by the Atmospheric Imaging Assembly on board the Solar …
Simultaneous Multiwavelength Variability Characterization of the Free-floating Planetary-mass Object PSO J318.5-22
Henning, Thomas; Bézard, Bruno; Manjavacas, Elena +15 more
We present simultaneous Hubble Space Telescope (HST) WFC3+Spitzer IRAC variability monitoring for the highly variable young (∼20 Myr) planetary-mass object PSO J318.5-22. Our simultaneous HST + Spitzer observations covered approximately two rotation periods with Spitzer and most of a rotation period with the HST. We derive a period of 8.6 ± 0.1 hr…
A Spatially Resolved au-scale Inner Disk around DM Tau
Dong, Ruobing; Liu, Hauyu Baobab; Tsukagoshi, Takashi +5 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of the dust continuum emission at 1.3 mm and 12CO J=2\to 1 line emission of the transitional disk around DM Tau. DM Tau’s disk is thought to possess a dust-free inner cavity inside a few au, from the absence of near-infrared excess on its spectral energy distrib…
Identifying the subtle signatures of feedback from distant AGN using ALMA observations and the EAGLE hydrodynamical simulations
Alexander, D. M.; Santini, P.; Swinbank, A. M. +10 more
We present sensitive 870 µm continuum measurements from our ALMA programmes of 114 X-ray selected active galactic nuclei (AGN) in the Chandra Deep Field-South and Cosmic Evolution Survey fields. We use these observations in combination with data from Spitzer and Herschel to construct a sample of 86 X-ray selected AGN, 63 with ALMA constraint…