Search Publications
The Mass of Stirring Bodies in the AU Mic Debris Disk Inferred from Resolved Vertical Structure
Hughes, A. Meredith; Carpenter, John; Wilner, David +9 more
The vertical distribution of dust in debris disks is sensitive to the number and size of large planetesimals dynamically stirring the disk, and is therefore well-suited for constraining the prevalence of otherwise unobservable Uranus and Neptune analogs. Information regarding stirring bodies has previously been inferred from infrared and optical o…
Catalog for the ESPRESSO blind radial velocity exoplanet survey
Rebolo, R.; Zapatero Osorio, M. R.; Poretti, E. +19 more
Aims: One of the main scientific drivers for ESPRESSO, Échelle SPectrograph, is the detection and characterization of Earth-class exoplanets. With this goal in mind, the ESPRESSO guaranteed time observations (GTO) Catalog identifies the best target stars for a blind search for the radial velocity (RV) signals caused by Earth-class exoplanets.…
Kepler-730: A Hot Jupiter System with a Close-in, Transiting, Earth-sized Planet
Schneider, Donald P.; Mahadevan, Suvrath; Majewski, Steven R. +9 more
Kepler-730 is a planetary system hosting a statistically validated hot Jupiter in a 6.49 day orbit and an additional transiting candidate in a 2.85 day orbit. We use spectroscopic radial velocities from the APOGEE-2N instrument, Robo-AO contrast curves, and Gaia distance estimates to statistically validate the planetary nature of the additional Ea…
A Hubble PanCET Study of HAT-P-11b: A Cloudy Neptune with a Low Atmospheric Metallicity
Nikolov, Nikolay; Mikal-Evans, Thomas; Sing, David K. +14 more
We present the first comprehensive look at the 0.35-5 µm transmission spectrum of the warm (∼800 K) Neptune HAT-P-11b derived from 13 individual transits observed using the Hubble and Spitzer Space Telescopes. Along with the previously published molecular absorption feature in the 1.1-1.7 µm bandpass, we detect a distinct absorption fe…
Kepler-411: a four-planet system with an active host star
Schmitt, J. H. M. M.; Wang, X.; Ioannidis, P. +3 more
We present a detailed characterization of the Kepler-411 system (KOI 1781). This system was previously known to host two transiting planets: one with a period of 3 days (R = 2.4 R⊕; Kepler-411b) and one with a period of 7.8 days (R = 4.4 R⊕; Kepler-411c), as well as a transiting planetary candidate with a 58-day period (R = 3…
Searches after Gravitational Waves Using ARizona Observatories (SAGUARO): System Overview and First Results from Advanced LIGO/Virgo’s Third Observing Run
Gabor, P.; Palazzi, E.; Smith, N. +54 more
We present Searches After Gravitational-waves Using ARizona Observatories (SAGUARO), a comprehensive effort dedicated to the discovery and characterization of optical counterparts to gravitational-wave (GW) events. SAGUARO utilizes ground-based facilities ranging from 1.5 to 10 m in diameter, located primarily in the Northern Hemisphere. We provid…
NuSTAR Observations of the Accreting Atolls GX 3+1, 4U 1702-429, 4U 0614+091, and 4U 1746-371
Harrison, F. A.; Degenaar, N.; Miller, J. M. +7 more
Atoll sources are accreting neutron star (NS) low-mass X-ray binaries. We present a spectral analysis of four persistent atoll sources (GX 3+1, 4U 1702-429, 4U 0614+091, and 4U 1746-371) observed for ∼20 ks each with NuSTAR to determine the extent of the inner accretion disk. These sources range from an apparent luminosity of 0.006-0.11 of the Edd…
Flame-like Ellerman Bombs and Their Connection to Solar Ultraviolet Bursts
Chen, Yajie; Cao, Wenda; Wang, Haimin +6 more
Ellerman bombs (EBs) are small-scale intense brightenings in Hα wing images, which are generally believed to be signatures of magnetic reconnection around the temperature minimum region of the solar atmosphere. They have a flame-like morphology when observed near the solar limb. Recent observations from the Interface Region Imaging Spectrograph (I…
Modelling the spectral energy distribution of super-Eddington quasars
Done, Chris; Kubota, Aya
We develop a broad-band spectral model, AGNSLIM, to describe super-Eddington black hole accretion disc spectra. This is based on the slim disc emissivity, where radial advection keeps the surface luminosity at the local Eddington limit, resulting in L(r) ∝ r-2 rather than the r-3 expected from the Novikov-Thorne (standard, su…
Arecibo radar observations of near-Earth asteroid (3200) Phaethon during the 2017 apparition
Bhiravarasu, Sriram S.; Benner, Lance A. M.; Giorgini, Jon D. +8 more
We report Arecibo S-band (2380 MHz; 12.6 cm) radar observations of near-Earth asteroid (3200) Phaethon during the December 2017 apparition when Phaethon passed within 0.07 au of Earth. Radar images with a resolution of 75 m per pixel reveal a roughly spheroidal shape more than 6 km in diameter at the equator with several discernible surface featur…