Search Publications
Kepler K2 and TESS Observations of Two Magnetic Cataclysmic Variables: The New Asynchronous Polar SDSS J084617.11+245344.1 and Paloma
Rappaport, Saul A.; Jayaraman, Rahul; Garnavich, Peter +7 more
There have been relatively few published long-duration, uninterrupted light curves of magnetic cataclysmic variable stars in which the accreting white dwarf's rotational frequency is slightly desynchronized from the binary orbital frequency. We report Kepler K2 and TESS observations of two such systems. The first, SDSS J084617.11+245344.1, was obs…
Interstellar Polarization Survey. II. General Interstellar Medium
Magalhães, A. M.; Kawabata, Koji S.; Rodrigues, C. V. +4 more
Magnetic fields permeate the entire Galaxy and are essential to, for example, the regulation of several stages of the star formation process and cosmic-ray transportation. Unraveling their properties, such as intensity and topology, is an observational challenge that requires combining different and complementary techniques. The polarization of st…
Observing Atmospheric Escape in Sub-Jovian Worlds with JWST
Alam, Munazza K.; Espinoza, Néstor; Dos Santos, Leonardo A. +1 more
Hydrodynamic atmospheric escape is considered an important process that shapes the evolution of sub-Jovian exoplanets, particularly those with short orbital periods. The metastable He line in the near-infrared at 1.083 µm is a reliable tracer of atmospheric escape in hot exoplanets, with the advantage of being observable from the ground. How…
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…