Ashley Chontos
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View article: A Homogeneous Catalog of Oscillating Solar-type Stars Observed by the Kepler Mission and a New Amplitude Scaling Relation Including Chromospheric Activity
A Homogeneous Catalog of Oscillating Solar-type Stars Observed by the Kepler Mission and a New Amplitude Scaling Relation Including Chromospheric Activity Open
We present a homogeneous catalog of global asteroseismic parameters and derived stellar parameters for 765 Kepler main-sequence and subgiant stars. The catalog was produced by reanalyzing all available Kepler DR25 short-cadence data using …
View article: The TESS Grand Unified Hot Jupiter Survey. III. Thirty More Giant Planets<sup>*</sup>
The TESS Grand Unified Hot Jupiter Survey. III. Thirty More Giant Planets<sup>*</sup> Open
We present the discovery of 30 transiting giant planets that were initially detected using data from NASA’s Transiting Exoplanet Survey Satellite mission. These new planets orbit relatively bright ( G ≤ 12.5) FGK host stars with orbital pe…
View article: Luminaries in the sky: The TESS legacy sample of bright stars
Luminaries in the sky: The TESS legacy sample of bright stars Open
Aims . We aim to detect and characterise solar-like oscillations in bright naked-eye ( V <6) main-sequence and subgiant stars observed by the Transiting Exoplanet Survey Satellite (TESS). In doing so, we seek to expand the current benchmar…
View article: The Compositions of Rocky Planets in Close-in Orbits Tend to Be Earth-like
The Compositions of Rocky Planets in Close-in Orbits Tend to Be Earth-like Open
Hundreds of exoplanets between 1 and 1.8 times the size of Earth have been discovered on close-in orbits. However, these planets show such a diversity in densities that some appear to be made entirely of iron, while others appear to host g…
View article: The TESS Grand Unified Hot Jupiter Survey. III. Thirty More Giant Planets
The TESS Grand Unified Hot Jupiter Survey. III. Thirty More Giant Planets Open
We present the discovery of 30 transiting giant planets that were initially detected using data from NASA's Transiting Exoplanet Survey Satellite (TESS) mission. These new planets orbit relatively bright ($G \leq 12.5$) FGK host stars with…
View article: Planet Masses, Radii, and Orbits from NASA’s K2 Mission
Planet Masses, Radii, and Orbits from NASA’s K2 Mission Open
We report the masses, sizes, and orbital properties of 86 planets orbiting 55 stars observed by NASA’s K2 Mission with follow-up Doppler measurements by the HIRES spectrometer at the W. M. Keck Observatory and the Automated Planet Finder a…
View article: K Dwarf Radius Inflation and a 10 Gyr Spin-down Clock Unveiled through Asteroseismology of HD 219134 from the Keck Planet Finder
K Dwarf Radius Inflation and a 10 Gyr Spin-down Clock Unveiled through Asteroseismology of HD 219134 from the Keck Planet Finder Open
We present the first asteroseismic analysis of the K3 V planet host HD 219134 based on four consecutive nights of radial velocities collected with the Keck Planet Finder. We apply Gold deconvolution to the power spectrum to disentangle mod…
View article: The TESS–Keck Survey. XXIV. Outer Giants May Be More Prevalent in the Presence of Inner Small Planets
The TESS–Keck Survey. XXIV. Outer Giants May Be More Prevalent in the Presence of Inner Small Planets Open
We present the results of the Distant Giants Survey, a 3 yr radial velocity (RV) campaign to search for wide-separation giant planets orbiting Sun-like stars known to host an inner transiting planet. We defined a distant giant (DG) to have…
View article: A Homogeneous Catalog of Oscillating Solar-Type Stars Observed by the Kepler Mission and a New Amplitude Scaling Relation Including Chromospheric Activity
A Homogeneous Catalog of Oscillating Solar-Type Stars Observed by the Kepler Mission and a New Amplitude Scaling Relation Including Chromospheric Activity Open
We present a homogeneous catalog of global asteroseismic parameters and derived stellar parameters for 765 Kepler main-sequence and subgiant stars. The catalog was produced by re-analyzing all available Kepler DR25 short-cadence data using…
View article: Planet Masses, Radii, and Orbits from NASA's K2 Mission
Planet Masses, Radii, and Orbits from NASA's K2 Mission Open
We report the masses, sizes, and orbital properties of 86 planets orbiting 55 stars observed by NASA's K2 Mission with follow-up Doppler measurements by the HIRES spectrometer at the W. M. Keck Observatory and the Automated Planet Finder a…
View article: K-dwarf Radius Inflation and a 10-Gyr Spin-down Clock Unveiled through Asteroseismology of HD 219134 from the Keck Planet Finder
K-dwarf Radius Inflation and a 10-Gyr Spin-down Clock Unveiled through Asteroseismology of HD 219134 from the Keck Planet Finder Open
We present the first asteroseismic analysis of the K3\,V planet host HD~219134, based on four consecutive nights of radial velocities collected with the Keck Planet Finder. We applied Gold deconvolution to the power spectrum to disentangle…
View article: Origins of Super Jupiters: TOI-2145b has a Moderately Eccentric and Nearly Aligned Orbit
Origins of Super Jupiters: TOI-2145b has a Moderately Eccentric and Nearly Aligned Orbit Open
Super Jupiters are giant planets with several Jupiter masses. It remains an open question whether these planets originate with such high masses or grow through collisions. Previous work demonstrates that warm super Jupiters tend to have mo…
View article: Origins of Super Jupiters: TOI-2145b Has a Moderately Eccentric and Nearly Aligned Orbit
Origins of Super Jupiters: TOI-2145b Has a Moderately Eccentric and Nearly Aligned Orbit Open
Super Jupiters are giant planets with several Jupiter masses. It remains an open question whether these planets originate with such high masses or grow through collisions. Previous work demonstrates that warm super Jupiters tend to have mo…
View article: Asteroseismology of the Nearby K Dwarf σ Draconis Using the Keck Planet Finder and TESS
Asteroseismology of the Nearby K Dwarf σ Draconis Using the Keck Planet Finder and TESS Open
Asteroseismology of dwarf stars cooler than the Sun is very challenging owing to the low amplitudes and rapid timescales of oscillations. Here we present the asteroseismic detection of solar-like oscillations at 4-minute timescales ( …
View article: The California Legacy Survey. V. Chromospheric Activity Cycles in Main-sequence Stars
The California Legacy Survey. V. Chromospheric Activity Cycles in Main-sequence Stars Open
We present optical spectroscopy of 710 solar neighborhood stars collected over 20 years to catalog chromospheric activity and search for stellar activity cycles. The California Legacy Survey stars are amenable to exoplanet detection using …
View article: The TESS-Keck Survey. XXII. A Sub-Neptune Orbiting TOI-1437
The TESS-Keck Survey. XXII. A Sub-Neptune Orbiting TOI-1437 Open
Exoplanet discoveries have revealed a dramatic diversity of planet sizes across a vast array of orbital architectures. Sub-Neptunes are of particular interest; due to their absence in our own solar system, we rely on demographics of exopla…
View article: Obliquities of Exoplanet Host Stars: 19 New and Updated Measurements, and Trends in the Sample of 205 Measurements
Obliquities of Exoplanet Host Stars: 19 New and Updated Measurements, and Trends in the Sample of 205 Measurements Open
Measurements of the obliquities in exoplanet systems have revealed some remarkable architectures, some of which are very different from the Solar System. Nearly 200 obliquity measurements have been obtained through observations of the Ross…
View article: Asteroseismology of the Nearby K-Dwarf $σ$ Draconis using the Keck Planet Finder and TESS
Asteroseismology of the Nearby K-Dwarf $σ$ Draconis using the Keck Planet Finder and TESS Open
Asteroseismology of dwarf stars cooler than the Sun is very challenging due to the low amplitudes and rapid timescales of oscillations. Here, we present the asteroseismic detection of solar-like oscillations at 4-minute timescales ($ν_{\ma…
View article: TESS Giants Transiting Giants. VI. Newly Discovered Hot Jupiters Provide Evidence for Efficient Obliquity Damping after the Main Sequence
TESS Giants Transiting Giants. VI. Newly Discovered Hot Jupiters Provide Evidence for Efficient Obliquity Damping after the Main Sequence Open
The degree of alignment between a star’s spin axis and the orbital plane of its planets (the stellar obliquity) is related to interesting and poorly understood processes that occur during planet formation and evolution. Hot Jupiters orbiti…
View article: The California Legacy Survey V. Chromospheric Activity Cycles in Main Sequence Stars
The California Legacy Survey V. Chromospheric Activity Cycles in Main Sequence Stars Open
We present optical spectroscopy of 710 solar neighborhood stars collected over twenty years to catalog chromospheric activity and search for stellar activity cycles. The California Legacy Survey stars are amenable to exoplanet detection us…
View article: TESS Giants Transiting Giants. IV. A Low-density Hot Neptune Orbiting a Red Giant Star
TESS Giants Transiting Giants. IV. A Low-density Hot Neptune Orbiting a Red Giant Star Open
Hot Neptunes, gaseous planets smaller than Saturn (∼3–8 R ⊕ ) with orbital periods less than 10 days, are rare. Models predict this is due to high-energy stellar irradiation stripping planetary atmospheres over time, often leaving behind o…
View article: The TESS-Keck Survey. XX. 15 New TESS Planets and a Uniform RV Analysis of All Survey Targets
The TESS-Keck Survey. XX. 15 New TESS Planets and a Uniform RV Analysis of All Survey Targets Open
The Transiting Exoplanet Survey Satellite (TESS) has discovered hundreds of new worlds, with TESS planet candidates now outnumbering the total number of confirmed planets from Kepler. Owing to differences in survey design, TESS continues t…
View article: The TESS-Keck Survey. VII. A Superdense Sub-Neptune Orbiting TOI-1824*
The TESS-Keck Survey. VII. A Superdense Sub-Neptune Orbiting TOI-1824* Open
We confirm a massive sub-Neptune-sized planet on a P = 22.8 days orbit around the star TOI-1824 ( T eff = 5200 K, V = 9.7 mag). TESS first identified TOI-1824 b (formerly TOI-1824.01) as an object of interest in 2020 April after two transi…
View article: The K2 Asteroseismic KEYSTONE sample of Dwarf and Subgiant Solar-Like Oscillators
The K2 Asteroseismic KEYSTONE sample of Dwarf and Subgiant Solar-Like Oscillators Open
Aims . The KEYSTONE project aims to enhance our understanding of solar-like oscillators by delivering a catalogue of global asteroseismic parameters (Δ v and v max ) for 173 stars, comprising mainly dwarfs and subgiants, observed by the K2…
View article: The TESS-Keck Survey. XXII. A sub-Neptune Orbiting TOI-1437
The TESS-Keck Survey. XXII. A sub-Neptune Orbiting TOI-1437 Open
Exoplanet discoveries have revealed a dramatic diversity of planet sizes across a vast array of orbital architectures. Sub-Neptunes are of particular interest; due to their absence in our own solar system, we rely on demographics of exopla…
View article: Planet Hunters TESS. V. A Planetary System Around a Binary Star, Including a Mini-Neptune in the Habitable Zone
Planet Hunters TESS. V. A Planetary System Around a Binary Star, Including a Mini-Neptune in the Habitable Zone Open
We report on the discovery and validation of a transiting long-period mini-Neptune orbiting a bright ( V = 9.0 mag) G dwarf (TOI 4633; R = 1.05 R ⊙ , M = 1.10 M ⊙ ). The planet was identified in data from the Transiting Exoplanet Survey Sa…
View article: Identification of the Top TESS Objects of Interest for Atmospheric Characterization of Transiting Exoplanets with JWST
Identification of the Top TESS Objects of Interest for Atmospheric Characterization of Transiting Exoplanets with JWST Open
JWST has ushered in an era of unprecedented ability to characterize exoplanetary atmospheres. While there are over 5000 confirmed planets, more than 4000 Transiting Exoplanet Survey Satellite (TESS) planet candidates are still unconfirmed …
View article: The TESS-Keck Survey. XVIII. A Sub-Neptune and Spurious Long-period Signal in the TOI-1751 System
The TESS-Keck Survey. XVIII. A Sub-Neptune and Spurious Long-period Signal in the TOI-1751 System Open
We present and confirm TOI-1751 b, a transiting sub-Neptune orbiting a slightly evolved, solar-type, metal-poor star ( T eff = 5996 ± 110 K, , V = 9.3 mag, [Fe/H] = −0.40 ± 0.06 dex) every 37.47 days. We use TESS photometry to mea…
View article: A Tale of Two Peas in a Pod: The Kepler-323 and Kepler-104 Systems
A Tale of Two Peas in a Pod: The Kepler-323 and Kepler-104 Systems Open
In order to understand the relationship between planet multiplicity, mass, and composition, we present newly measured masses of five planets in two planetary systems: Kepler-323 and Kepler-104. We used the HIRES instrument at the W.M. Keck…
View article: The TESS-Keck Survey. XII. A Dense 1.8 R<sub>⊕</sub> Ultra-short-period Planet Possibly Clinging to aHigh-mean-molecular-weight Atmosphere after the First Gigayear
The TESS-Keck Survey. XII. A Dense 1.8 R<sub>⊕</sub> Ultra-short-period Planet Possibly Clinging to aHigh-mean-molecular-weight Atmosphere after the First Gigayear Open
The extreme environments of ultra-short-period planets (USPs) make excellent laboratories to study how exoplanets obtain, lose, retain, and/or regain gaseous atmospheres. We present the confirmation and characterization of the USP TOI-1347…