Search Publications
Prospects from TESS and Gaia to Constrain the Flatness of Planetary Systems
Zhu, Wei; Espinoza-Retamal, Juan I.; Petrovich, Cristobal
The mutual inclination between planets orbiting the same star provides key information to understand the formation and evolution of multiplanet systems. In this work, we investigate the potential of Gaia astrometry in detecting and characterizing cold Jupiters in orbits exterior to the currently known Transiting Exoplanet Survey Satellite (TESS) p…
The Variable Detection of Atmospheric Escape around the Young, Hot Neptune AU Mic b
Youngblood, Allison; Lowrance, Patrick J.; Mann, Andrew W. +5 more
Photoevaporation is a potential explanation for several features within exoplanet demographics. Atmospheric escape observed in young Neptune-sized exoplanets can provide insight into and characterize which mechanisms drive this evolution and at what times they dominate. AU Mic b is one such exoplanet, slightly larger than Neptune (4.19 R ⊕
Flares, Rotation, Activity Cycles, and a Magnetic Star–Planet Interaction Hypothesis for the Far-ultraviolet Emission of GJ 436
Loyd, R. O. Parke; Jackman, James A. G.; France, Kevin +6 more
Variability in the far-ultraviolet (FUV) emission produced by stellar activity affects photochemistry and heating in orbiting planetary atmospheres. We present a comprehensive analysis of the FUV variability of GJ 436, a field-age M2.5V star (P rot ≈ 44 days) that is orbited by a warm Neptune-sized planet (M ≈ 25 M ⊕, R ≈ 4.1…
Hyades Member K2-136c: The Smallest Planet in an Open Cluster with a Precisely Measured Mass
Vanderburg, Andrew; Shkolnik, Evgenya; López-Morales, Mercedes +39 more
K2-136 is a late-K dwarf (0.742 ± 0.039 M ⊙) in the Hyades open cluster with three known, transiting planets and an age of 650 ± 70 Myr. Analyzing K2 photometry, we found that planets K2-136b, c, and d have periods of 8.0, 17.3, and 25.6 days and radii of 1.014 ± 0.050 R ⊕, 3.00 ± 0.13 R ⊕, and 1.565 ± 0.077 R
Stellar Properties for a Comprehensive Collection of Star-forming Regions in the SDSS APOGEE-2 Survey
Bizyaev, Dmitry; Pan, Kaike; Stassun, Keivan G. +25 more
The Sloan Digital Sky Survey IV APOGEE-2 primary science goal was to observe red giant stars throughout the Galaxy to study its dynamics, morphology, and chemical evolution. The APOGEE instrument, a high-resolution 300-fiber H-band (1.55-1.71 µm) spectrograph, is also ideal to study other stellar populations in the Galaxy, among which are a …
The TESS-Keck Survey. XV. Precise Properties of 108 TESS Planets and Their Host Stars
Batalha, Natalie M.; Rice, Malena; Kane, Stephen R. +38 more
We present the stellar and planetary properties for 85 TESS Objects of Interest (TOIs) hosting 108 planet candidates that compose the TESS-Keck Survey (TKS) sample. We combine photometry, high-resolution spectroscopy, and Gaia parallaxes to measure precise and accurate stellar properties. We then use these parameters as inputs to a light-curve pro…
Predicting the Yield of Small Transiting Exoplanets around Mid-M and Ultracool Dwarfs in the Nancy Grace Roman Space Telescope Galactic Bulge Time Domain Survey
Muirhead, Philip S.; Dressing, Courtney D.; Tamburo, Patrick
We simulate the yield of small (0.5-4.0 R ⊕) transiting exoplanets around single mid-M and ultracool dwarfs (UCDs) in the Nancy Grace Roman Space Telescope Galactic Bulge Time Domain Survey. We consider multiple approaches for simulating M3-T9 sources within the survey fields, including scaling local space densities and using Galactic s…
The Breakthrough Listen Search for Intelligent Life: A Laser Search Pipeline for the Automated Planet Finder
Croft, Steve; Isaacson, Howard; Siemion, Andrew +4 more
The Search for Extraterrestrial Intelligence has traditionally been conducted at radio wavelengths, but optical searches are well-motivated and increasingly feasible due to the growing availability of high-resolution spectroscopy. We present a data analysis pipeline to search Automated Planet Finder (APF) spectroscopic observations from the Levy S…
Detection of Strongly Lensed Arcs in Galaxy Clusters with Transformers
Li, Nan; Luo, Rui; Jia, Peng +4 more
Strong lensing in galaxy clusters probes properties of dense cores of dark matter halos in mass, studies the distant universe at flux levels and spatial resolutions otherwise unavailable, and constrains cosmological models independently. The next-generation large-scale sky imaging surveys are expected to discover thousands of cluster-scale strong …
Disk or Companion: Characterizing Excess Infrared Flux in Seven White Dwarf Systems with Near-infrared Spectroscopy
Zuckerman, B.; Manjavacas, Elena; Dufour, Patrick +7 more
Excess infrared flux from white dwarf stars is likely to arise from a dusty debris disk or a cool companion. In this work, we present near-infrared spectroscopic observations with Keck/MOSFIRE, Gemini/GNIRS, and Gemini/Flamingos-2 of seven white dwarfs with infrared excesses identified in previous studies. We confirmed the presence of dust disks a…