Search Publications
Gyro-kinematic Ages for around 30,000 Kepler Stars
Angus, Ruth; Kiman, Rocio; Curtis, Jason L. +2 more
Estimating stellar ages is important for advancing our understanding of stellar and exoplanet evolution and investigating the history of the Milky Way. However, ages for low-mass stars are hard to infer as they evolve slowly on the main sequence. In addition, empirical dating methods are difficult to calibrate for low-mass stars as they are faint.…
Constraining Mornings and Evenings on Distant Worlds: A new Semianalytical Approach and Prospects with Transmission Spectroscopy
Espinoza, Néstor; Jones, Kathryn
The technique of transmission spectroscopy-the variation of a planetary radius with wavelength due to opacity sources in the planet's terminator region-has been one of the most successful in the characterization of exoplanet atmospheres to date, providing key insights into the composition and structure of these distant worlds. A common assumption …
A Detailed Characterization of HR 8799's Debris Disk with ALMA in Band 7
Stapelfeldt, Karl R.; Hales, Antonio S.; Casassus, Simon +8 more
The exoplanetary system of HR 8799 is one of the rare systems in which multiple planets have been directly imaged. Its architecture is strikingly similar to that of the solar system, with the four imaged giant planets surrounding a warm dust belt analogous to the Asteroid Belt, and themselves being surrounded by a cold dust belt analog to the Kuip…
Low-luminosity Galaxies in the Early Universe Have Observed Sizes Similar to Star Cluster Complexes
Oesch, P. A.; Bouwens, R. J.; Illingworth, G. D. +3 more
We compare the sizes and luminosities of faint z = 6-8 galaxies magnified by the Hubble Frontier Fields clusters with star-forming regions, as well as more evolved objects, in the nearby universe. Our high-redshift comparison sample includes 330 z = 6-8 galaxies, for which size measurements were made as part of a companion study where lensing magn…
Hot Stars with Kepler Planets Have High Obliquities
Howard, Andrew W.; Petigura, Erik A.; Winn, Joshua N. +5 more
It has been known for a decade that hot stars with hot Jupiters tend to have high obliquities. Less is known about the degree of spin-orbit alignment for hot stars with other kinds of planets. Here, we reassess the obliquities of hot Kepler stars with transiting planets smaller than Neptune, based on spectroscopic measurements of their projected r…
ARES IV: Probing the Atmospheres of the Two Warm Small Planets HD 106315c and HD 3167c with the HST/WFC3 Camera
Drossart, Pierre; Marcq, Emmanuel; Blain, Doriann +27 more
We present an atmospheric characterization study of two medium-sized planets bracketing the radius of Neptune: HD 106315c (RP = 4.98 ± 0.23 R⊕) and HD 3167c ( ${R}_{{\rm{P}}}={2.740}_{-0.100}^{+0.106}$ R⊕). We analyze spatially scanned spectroscopic observations obtained with the G141 grism (1.125-1.650 µm) o…
PBjam: A Python Package for Automating Asteroseismology of Solar-like Oscillators
García, R. A.; Chaplin, W. J.; Moya, A. +14 more
Asteroseismology is an exceptional tool for studying stars using the properties of observed modes of oscillation. So far the process of performing an asteroseismic analysis of a star has remained somewhat esoteric and inaccessible to nonexperts. In this software paper we describe PBjam, an open-source Python package for analyzing the frequency spe…
Architectures of Exoplanetary Systems. II. An Increase in Inner Planetary System Occurrence toward Later Spectral Types for Kepler's FGK Dwarfs
Ford, Eric B.; Ragozzine, Darin; He, Matthias Y.
The Kepler mission observed thousands of transiting exoplanet candidates around hundreds of thousands of FGK dwarf stars. He et al. applied forward modeling to infer the distribution of intrinsic architectures of planetary systems, developed a clustered Poisson point process model for exoplanetary systems (SysSim) to reproduce the marginal distrib…
The Second Data Release of the Survey of the MAgellanic Stellar History (SMASH)
Bell, Eric F.; Monachesi, Antonela; Carballo-Bello, Julio A. +32 more
The Large and Small Magellanic Clouds (LMC and SMC) are the largest satellite galaxies of the Milky Way and close enough to allow for a detailed exploration of their structure and formation history. The Survey of the MAgellanic Stellar History (SMASH) is a community Dark Energy Camera (DECam) survey of the Magellanic Clouds using ∼50 nights to sam…
Precise Masses and Orbits for Nine Radial-velocity Exoplanets
Jensen-Clem, Rebecca; Dupuy, Trent J.; Brandt, Timothy D. +6 more
Radial-velocity (RV) surveys have discovered hundreds of exoplanetary systems but suffer from a fundamental degeneracy between planet mass M p and orbital inclination i. In this paper, we resolve this degeneracy by combining RVs with complementary absolute astrometry taken from the Gaia EDR3 version of the cross calibrated Hipparcos-G…