Search Publications
A Closer Look at Exoplanet Occurrence Rates: Considering the Multiplicity of Stars without Detected Planets
Mayo, Andrew W.; Hirsch, Lea A.; Ciardi, David R. +5 more
One core goal of the Kepler mission was to determine the frequency of Earth-like planets that orbit Sun-like stars. Accurately estimating this planet occurrence rate requires both a well-vetted list of planets and a clear understanding of the stars searched for planets. Previous ground-based follow-up observations have, through a variety of method…
TOI-824 b: A New Planet on the Lower Edge of the Hot Neptune Desert
Butler, R. Paul; Barclay, Thomas; Vanderburg, Andrew +54 more
We report the detection of a transiting hot Neptune exoplanet orbiting TOI-824 (SCR J1448-5735), a nearby (d = 64 pc) K4V star, using data from the Transiting Exoplanet Survey Satellite. The newly discovered planet has a radius Rp = 2.93 ± 0.20 ${R}_{\oplus }$ and an orbital period of 1.393 days. Radial velocity measurements using the P…
WD1032 + 011, an inflated brown dwarf in an old eclipsing binary with a white dwarf
Hermes, J. J.; Winget, D. E.; Gänsicke, B. T. +11 more
We present the discovery of only the third brown dwarf known to eclipse a non-accreting white dwarf. Gaia parallax information and multicolour photometry confirm that the white dwarf is cool (9950 ± 150 K) and has a low mass (0.45 ± 0.05 M⊙), and spectra and light curves suggest the brown dwarf has a mass of 0.067 ± 0.006 M⊙ …
Testing general relativity with x-ray reflection spectroscopy: The Konoplya-Rezzolla-Zhidenko parametrization
Tripathi, Ashutosh; Abdikamalov, Askar B.; Ayzenberg, Dimitry +6 more
X-ray reflection spectroscopy is a promising technique for testing general relativity in the strong-field regime as it can be used to test the Kerr black hole hypothesis. In this context, the parametrically deformed black hole metrics proposed by Konoplya, Rezzolla, and Zhidenko [Phys. Rev. D 93, 064015 (2016), 10.1103/PhysRevD.93.064015] form an …
Star-forming Clumps in Local Luminous Infrared Galaxies
Sanders, D. B.; Murphy, E. J.; Armus, L. +15 more
We present HST narrowband near-infrared imaging of Paα and Paβ emission of 48 local luminous infrared galaxies (LIRGs) from the Great Observatories All-Sky LIRG Survey. These data allow us to measure the properties of 810 spatially resolved star-forming regions (59 nuclei and 751 extranuclear clumps) and directly compare their properties to those …
The Gaia-ESO Survey: Calibrating the lithium-age relation with open clusters and associations. I. Cluster age range and initial membership selections
Baratella, M.; Gilmore, G.; Bayo, A. +33 more
Context. Previous studies of open clusters have shown that lithium depletion is not only strongly age dependent but also shows a complex pattern with other parameters that is not yet understood. For pre- and main-sequence late-type stars, these parameters include metallicity, mixing mechanisms, convection structure, rotation, and magnetic activity…
Effects of radiation pressure on the evaporative wind of HD 209458b
Murray-Clay, Ruth; Frank, Adam; Fossati, Luca +4 more
The role of radiation pressure in shaping exoplanet photoevaporation remains a topic of contention. Radiation pressure from the exoplanet's host star has been proposed as a mechanism to drive the escaping atmosphere into a 'cometary' tail and explain the high velocities observed in systems where mass-loss is occurring. In this paper, we present re…
Resolving the Crab pulsar wind nebula at teraelectronvolt energies
H. E. S. S. Collaboration
The Crab nebula is one of the most-studied cosmic particle accelerators, shining brightly across the entire electromagnetic spectrum up to very-high-energy gamma rays1,2. It is known from observations in the radio to gamma-ray part of the spectrum that the nebula is powered by a pulsar, which converts most of its rotational energy losse…
deepCR: Cosmic Ray Rejection with Deep Learning
Zhang, Keming; Bloom, Joshua S.
Cosmic ray (CR) identification and replacement are critical components of imaging and spectroscopic reduction pipelines involving solid-state detectors. We present deepCR, a deep-learning-based framework for CR identification and subsequent image inpainting based on the predicted CR mask. To demonstrate the effectiveness of this framework, we trai…
Large-scale CO Spiral Arms and Complex Kinematics Associated with the T Tauri Star RU Lup
Wilner, David J.; Andrews, Sean M.; Huang, Jane +9 more
While protoplanetary disks often appear to be compact and well organized in millimeter continuum emission, CO spectral line observations are increasingly revealing complex behavior at large distances from the host star. We present deep Atacama Large Millimeter/submillimeter Array maps of the J = 2-1 transition of 12CO, 13CO, …