Dakotah Tyler
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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: Black in (exo)planetary science
Black in (exo)planetary science Open
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: 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: An Obliquity Measurement of the Hot Neptune TOI-1694b
An Obliquity Measurement of the Hot Neptune TOI-1694b Open
We present spectral observations of the multiplanet host TOI-1694 during the transit of TOI-1694b, a 26.1 M ⊕ hot Neptune with a 3.77 day orbit. By analyzing radial velocities obtained from the Keck Planet Finder, we modeled the Rossiter–M…
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: Revised Masses for Low-density Planets Orbiting the Disordered M-dwarf System TOI-1266
Revised Masses for Low-density Planets Orbiting the Disordered M-dwarf System TOI-1266 Open
We present an analysis of 126 new radial velocity measurements from the MAROON-X spectrograph to investigate the TOI-1266 system, which hosts two known transiting sub-Neptunes at 10.8 and 18.8 days. We integrated our measurements with exis…
View article: Gas Dynamics in 3 “Dippers”: EPIC 203850058, EPIC 204638512, and EPIC 205151387 in 2017–2018
Gas Dynamics in 3 “Dippers”: EPIC 203850058, EPIC 204638512, and EPIC 205151387 in 2017–2018 Open
We have examined variability of the three dipper stars—EPIC 203850058, EPIC 204638512, and EPIC 205151387—using the SpeX spectrograph on NASA’s Infrared Telescope facility on two nights in 2018. We combined these data with those previously…
View article: An Obliquity Measurement of the Hot Neptune TOI-1694b
An Obliquity Measurement of the Hot Neptune TOI-1694b Open
We present spectral observations of the multiplanet host TOI-1694 during the transit of TOI-1694b, a 26.1 $M_\oplus$ hot Neptune with a 3.77-day orbit. By analyzing radial velocities obtained from the Keck Planet Finder, we modeled the Ros…
View article: Revised Masses for Low Density Planets Orbiting the Disordered M-dwarf System TOI-1266
Revised Masses for Low Density Planets Orbiting the Disordered M-dwarf System TOI-1266 Open
We present an analysis of 126 new radial velocity measurements from the MAROON-X spectrograph to investigate the TOI-1266 system, which hosts two transiting sub-Neptunes at 10.8 and 18.8 days. We measure masses of $M_{b}=4.01~\pm~0.55~M_{\…
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 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 1-1.8 times the size of the 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-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: Additional Doppler Monitoring Corroborates HAT-P-11c as a Planet
Additional Doppler Monitoring Corroborates HAT-P-11c as a Planet Open
In 2010, Bakos and collaborators discovered a Neptune-sized planet transiting the K-dwarf HAT-P-11 every five days. Later in 2018, Yee and collaborators reported an additional Jovian-mass companion on a nine year orbit based on a decade of…
View article: Additional Doppler Monitoring Corroborates HAT-P-11 c as a Planet
Additional Doppler Monitoring Corroborates HAT-P-11 c as a Planet Open
In 2010, Bakos and collaborators discovered a Neptune-sized planet transiting the K-dwarf HAT-P-11 every five days. Later in 2018, Yee and collaborators reported an additional Jovian-mass companion on a nine year orbit based on a decade of…
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: 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. 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: 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…
View article: The TESS-Keck Survey. XII. A Dense 1.8 R$_\oplus$ Ultra-Short-Period Planet Possibly Clinging to a High-Mean-Molecular-Weight Atmosphere After the First Gyr
The TESS-Keck Survey. XII. A Dense 1.8 R$_\oplus$ Ultra-Short-Period Planet Possibly Clinging to a High-Mean-Molecular-Weight Atmosphere After the First Gyr 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…
View article: The TESS-Keck Survey. XVII. Precise Mass Measurements in a Young, High-multiplicity Transiting Planet System Using Radial Velocities and Transit Timing Variations
The TESS-Keck Survey. XVII. Precise Mass Measurements in a Young, High-multiplicity Transiting Planet System Using Radial Velocities and Transit Timing Variations Open
We present a radial velocity (RV) analysis of TOI-1136, a bright Transiting Exoplanet Survey Satellite (TESS) system with six confirmed transiting planets, and a seventh single-transiting planet candidate. All planets in the system are ame…
View article: WASP-69b’s Escaping Envelope Is Confined to a Tail Extending at Least 7 R<sub>p</sub>
WASP-69b’s Escaping Envelope Is Confined to a Tail Extending at Least 7 R<sub>p</sub> Open
Studying the escaping atmospheres of highly irradiated exoplanets is critical for understanding the physical mechanisms that shape the demographics of close-in planets. A number of planetary outflows have been observed as excess H/He absor…
View article: The Kepler Giant Planet Search. I. A Decade of Kepler Planet-host Radial Velocities from W. M. Keck Observatory
The Kepler Giant Planet Search. I. A Decade of Kepler Planet-host Radial Velocities from W. M. Keck Observatory Open
Despite the importance of Jupiter and Saturn to Earth’s formation and habitability, there has not yet been a comprehensive observational study of how giant exoplanets correlate with the architectural properties of close-in, sub-Neptune-siz…
View article: The TESS-Keck Survey XVII: Precise Mass Measurements in a Young, High Multiplicity Transiting Planet System using Radial Velocities and Transit Timing Variations
The TESS-Keck Survey XVII: Precise Mass Measurements in a Young, High Multiplicity Transiting Planet System using Radial Velocities and Transit Timing Variations Open
We present a radial velocity (RV) analysis of TOI-1136, a bright TESS system with six confirmed transiting planets, and a seventh single-transiting planet candidate. All planets in the system are amenable to transmission spectroscopy, maki…
View article: WASP-69b's Escaping Envelope is Confined to a Tail Extending at Least Seven Planet Radii
WASP-69b's Escaping Envelope is Confined to a Tail Extending at Least Seven Planet Radii Open
Studying the escaping atmospheres of highly-irradiated exoplanets is critical for understanding the physical mechanisms that shape the demographics of close-in planets. A number of planetary outflows have been observed as excess H/He absor…
View article: <i>TESS</i>giants transiting giants V – two hot Jupiters orbiting red giant hosts
<i>TESS</i>giants transiting giants V – two hot Jupiters orbiting red giant hosts Open
In this work, we present the discovery and confirmation of two hot Jupiters orbiting red giant stars, TOI-4377 b and TOI-4551 b, observed by Transiting Exoplanet Survey Satellite in the Southern ecliptic hemisphere and later followed-up wi…
View article: The TESS-Keck Survey. XVI. Mass Measurements for 12 Planets in Eight Systems
The TESS-Keck Survey. XVI. Mass Measurements for 12 Planets in Eight Systems Open
With JWST’s successful deployment and unexpectedly high fuel reserves, measuring the masses of sub-Neptunes transiting bright, nearby stars will soon become the bottleneck for characterizing the atmospheres of small exoplanets via transmis…
View article: A close-in giant planet escapes engulfment by its star
A close-in giant planet escapes engulfment by its star Open
View article: A close-in giant planet escapes engulfment by its star
A close-in giant planet escapes engulfment by its star Open
When main-sequence stars expand into red giants, they are expected to engulf close-in planets. Until now, the absence of planets with short orbital periods around post-expansion, core-helium-burning red giants has been interpreted as evide…