Search Publications
On the Ubiquity and Stellar Luminosity Dependence of Exocometary CO Gas: Detection around M Dwarf TWA 7
Bayo, A.; Wilner, D. J.; Olofsson, J. +2 more
Millimeter observations of CO gas in planetesimal belts show a high detection rate around A stars, but few detections for later type stars. We present the first CO detection in a planetesimal belt around an M star, TWA 7. The optically thin CO (J = 3-2) emission is colocated with previously identified dust emission from the belt, and the emission …
HATS-60b-HATS-69b: 10 Transiting Planets from HATSouth
Arriagada, P.; Butler, R. P.; Henning, Th. +27 more
We report the discovery of 10 transiting extrasolar planets by the HATSouth survey. The planets range in mass from the super-Neptune HATS-62b, with {M}p< 0.179 {M}{{J}}, to the super-Jupiter HATS-66b, with {M}p=5.33 {M}{{J}}, and in size from the Saturn HATS-69b, with {R}p=0.94 {R}{{J<…
Distant Comet C/2017 K2 and the Cohesion Bottleneck
Mutchler, Max; Jewitt, David; Agarwal, Jessica +3 more
The distant long-period comet C/2017 K2 (PANSTARRS) has been outside the planetary region of the solar system for ∼3 Myr, negating the possibility that heat retained from the previous perihelion could be responsible for its activity. This inbound comet is also too cold for water ice to sublimate and too cold for amorphous water ice, if present, to…
Long-period Giant Companions to Three Compact, Multiplanet Systems
Fulton, Benjamin J.; Hirsch, Lea A.; Howard, Andrew W. +7 more
Understanding the relationship between long-period giant planets and multiple smaller short-period planets is critical for formulating a complete picture of planet formation. This work characterizes three such systems. We present Kepler-65, a system with an eccentric (e = 0.28 ± 0.07) giant planet companion discovered via radial velocities (RVs) e…
Revisiting the Long-period Transiting Planets from Kepler
Zhu, Wei; Wu, Yanqin; Herman, Miranda K.
Currently, we have only limited means to probe the presence of planets at large orbital separations. Foreman-Mackey et al. searched for long-period transiting planets in the Kepler light curves using an automated pipeline. Here, we apply their pipeline, with minor modifications, to a larger sample and use updated stellar parameters from Gaia DR2. …
First ALMA Millimeter-wavelength Maps of Jupiter, with a Multiwavelength Study of Convection
de Pater, Imke; Sault, R. J.; Wong, Michael H. +15 more
We obtained the first maps of Jupiter at 1-3 mm wavelength with the Atacama Large Millimeter/Submillimeter Array (ALMA) on 2017 January 3-5, just days after an energetic eruption at 16.°5S jovigraphic latitude had been reported by the amateur community, and about two to three months after the detection of similarly energetic eruptions in the north…
A Tail Structure Associated with a Protoplanetary Disk around SU Aurigae
Dong, Ruobing; Liu, Sheng-Yuan; Tamura, Motohide +4 more
We present Atacama Large Millimeter/submillimeter Array observations of the CO (J = 2 - 1) line emission from a protoplanetary disk around T-Tauri star SU Aurigae (hereafter SU Aur). Previous observations in optical and near-infrared wavelengths find a unique structure in SU Aur. One of the highlights of the observational results is that an extend…
Machine Learning Applied to Star-Galaxy-QSO Classification and Stellar Effective Temperature Regression
Bai, Yu; Wang, Song; Yang, Fan +1 more
In modern astrophysics, machine learning has increasingly gained popularity with its incredibly powerful ability to make predictions or calculated suggestions for large amounts of data. We describe an application of the supervised machine-learning algorithm, random forests (RF), to the star/galaxy/QSO classification and the stellar effective tempe…
Li Evolution and the Open Cluster NGC 6819: A Correlation between Li Depletion and Spindown in Dwarfs More Massive Than the F-Dwarf Li-Dip
Twarog, Bruce A.; Anthony-Twarog, Barbara J.; Deliyannis, Constantine P. +1 more
Spectroscopy of 333 NGC 6819 stars and Gaia astrometry are used to map Li evolution from the giant branch tip to 0.5 mag below the Li dip. Isochrone comparison with [Fe/H] = -0.04, based upon neural network spectroscopic analysis, produces an age of 2.25 (2.4) Gyr for E(B - V) = 0.16 (0.14) and (m - M) = 12.40 (12.29). Despite originating outside …
The Physics of the Accelerating Universe Camera
Carretero, Jorge; Castander, Francisco J.; Eriksen, Martin +30 more
The Physics of the Accelerating Universe (PAU) Survey goal is to obtain photometric redshifts (photo-z) and spectral energy distributions (SEDs) of astronomical objects with a resolution roughly one order of magnitude better than current broadband (BB) photometric surveys. To accomplish this, a new large field-of-view (FoV) camera (PAUCam) has bee…