Search Publications
Discovery of Three New Transiting Hot Jupiters: WASP-161 b, WASP-163 b, and WASP-170 b
Bouchy, F.; Queloz, D.; Delrez, L. +28 more
We present the discovery of three new transiting hot Jupiters by the WASP-South project, WASP-161 b, WASP-163 b, and WASP-170 b. Follow-up radial velocities obtained with the Euler/CORALIE spectrograph and transit light curves obtained with the TRAPPIST-North, TRAPPIST-South, SPECULOOS-South, NITES, and Euler telescopes have enabled us to determin…
Giant Planet Occurrence within 0.2 au of Low-luminosity Red Giant Branch Stars with K2
Huber, Daniel; Gaidos, Eric; Stello, Dennis +3 more
Every Sun-like star will eventually evolve into a red giant, a transition which can profoundly affect the evolution of a surrounding planetary system. The timescale of dynamical planet evolution and orbital decay has important implications for planetary habitability, as well as post-main-sequence star and planet interaction, evolution, and interna…
Radii of 88 M Subdwarfs and Updated Radius Relations for Low-metallicity M-dwarf Stars
Kesseli, Aurora Y.; Muirhead, Philip S.; Cushing, Michael C. +9 more
M subdwarfs are low-metallicity M dwarfs that typically inhabit the halo population of the Galaxy. Metallicity controls the opacity of stellar atmospheres; in metal-poor stars, hydrostatic equilibrium is reached at a smaller radius, leading to smaller radii for a given effective temperature. We compile a sample of 88 stars that span spectral class…
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…