Samuel W. Yee
A5034689299- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Space Exploration and Technology
- Solar and Space Plasma Dynamics
- Scientific Research and Discoveries
- Prostate Cancer Diagnosis and Treatment
- Planetary Science and Exploration
- Spacecraft and Cryogenic Technologies
- Geological and Geochemical Analysis
- Isotope Analysis in Ecology
- High-pressure geophysics and materials
- Geophysics and Gravity Measurements
- Quantum chaos and dynamical systems
- Calibration and Measurement Techniques
- Spacecraft Design and Technology
- Radio Astronomy Observations and Technology
- Astronomical and nuclear sciences
- Quantum, superfluid, helium dynamics
- Radioactive element chemistry and processing
- Urologic and reproductive health conditions
- Urinary Tract Infections Management
Princeton University
2019-2024
Center for Astrophysics Harvard & Smithsonian
2024
Chinese University of Hong Kong
2022
California Institute of Technology
2016-2018
Abstract Classification of stars, by comparing their optical spectra to a few dozen spectral standards, has been workhorse observational astronomy for more than century. Here, we extend this technique compiling library 404 touchstone stars observed with Keck/HIRES the California Planet Search. The have high resolution ( R ≈ 60,000), signal-to-noise ratio (S/N 150/pixel), and are registered onto common wavelength scale. properties derived from interferometry, asteroseismology, LTE synthesis,...
WASP-12b is a transiting hot Jupiter on 1.09-day orbit around late-F star. Since the planet's discovery in 2008, time interval between transits has been decreasing by $29\pm 2$ msec year$^{-1}$. This possible sign of orbital decay, although previously available data left open possibility that slightly eccentric and undergoing apsidal precession. Here, we present new transit occultation observations provide more decisive evidence for which favored over precession $\Delta\mathrm{BIC}$ 22.3 or...
Abstract NASA’s Transiting Exoplanet Survey Satellite (TESS) mission promises to improve our understanding of hot Jupiters by providing an all-sky, magnitude-limited sample transiting suitable for population studies. Assembling such a requires confirming hundreds planet candidates with additional follow-up observations. Here we present 20 that were detected using TESS data and confirmed be planets through photometric, spectroscopic, imaging observations coordinated the Follow-up Observing...
Abstract We confirm TOI-4201 b as a transiting Jovian-mass planet orbiting an early M dwarf discovered by the Transiting Exoplanet Survey Satellite. Using ground-based photometry and precise radial velocities from NEID Planet Finder Spectrograph, we measure mass of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mn>2.59</mml:mn> </mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.06</mml:mn> <mml:mo>+</mml:mo> <mml:mn>0.07</mml:mn>...
Abstract TOI-677 b is part of an emerging class “tidally detached” gas giants ( a / R ⋆ ≳ 11) that exhibit large orbital eccentricities and yet low stellar obliquities. Such sources pose challenge for models giant planet formation, which must account the excitation high without changes in inclination. In this work, we present new Rossiter–McLaughlin measurement tidally detached warm Jupiter b, obtained using high-precision radial velocity observations with Magellan’s Planet Finder...
Abstract HAT-P-11 is a mid-K dwarf that hosts one of the first Neptune-sized planets found outside solar system. The orbit HAT-P-11b misaligned with star’s spin—one few known cases planet orbiting star less massive than Sun. We find an additional in system based on decade precision radial velocity (RV) measurements from Keck/High Resolution Echelle Spectrometer. HAT-P-11c similar to Jupiter its mass ( M J ) and orbital period year), but has much more eccentric e = 0.60 ± 0.03). In our joint...
We present 151 planet candidates orbiting 141 stars from K2 campaigns 5-8 (C5-C8), identified through a systematic search of photometry. In addition, we identify 16 targets as likely eclipsing binaries, based on their light curve morphology. obtained follow-up optical spectra 105/141 candidate host and 8/16 binaries to improve stellar properties spectroscopic binaries. Importantly, spectroscopy enables measurements star radii with $\approx$10% precision, compared $\approx$40% precision when...
In this study, we performed a homogeneous analysis of the planets around FGK dwarf stars observed by Kepler and K2 missions, providing spectroscopic parameters for 310 targets -- including 239 Scaling hosts with Keck/HIRES. For orbital periods less than 40 days, found that distribution as function period, stellar effective temperature, metallicity was consistent between Kepler, reflecting planet formation efficiency across numerous ~1 kpc sight-lines in local Milky Way. Additionally,...
Abstract The Transiting Exoplanet Survey Satellite (TESS) has discovered hundreds of new worlds, with TESS planet candidates now outnumbering the total number confirmed planets from Kepler. Owing to differences in survey design, continues provide that are better suited for subsequent follow-up studies, including mass measurement through radial velocity (RV) observations, compared Kepler targets. In this work, we present TESS-Keck Survey’s (TKS) Mass Catalog: a uniform analysis all TKS RV...
Abstract TOI-6255 b (GJ 4256) is an Earth-sized planet (1.079 ± 0.065 R ⊕ ) with orbital period of only 5.7 hr. With the newly commissioned Keck Planet Finder and CARMENES spectrographs, we determine planet’s mass to be 1.44 0.14 M . The just outside Roche limit, P orb / = 1.13 0.10. strong tidal force likely deforms into a triaxial ellipsoid long axis that ∼10% longer than short axis. Assuming reduced stellar quality factor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Abstract 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 USP TOI-1347 b, a 1.8 ± 0.1 R ⊕ planet on 0.85 day orbit that was detected with photometry from TESS mission. measured radial velocities system using Keck/HIRES HARPS-N found be unusually massive at 11.1 1.2 M . mass radius b imply an Earth-like bulk composition. A...
Abstract The distribution of stellar obliquities provides critical insight into the formation and evolution pathways exoplanets. In past decade, it was found that hot stars hosting Jupiters are more likely to have high than cool stars, but is not clear whether this trend exists only for or holds other types planets. work, we extend study (6250–7000 K) with transiting super-Earth-sized sub-Neptune-sized We constrain obliquity based on measurements stars’ projected rotation velocities. Our...
We report the discovery of BD+05$\,$4868$\,$Ab, a transiting exoplanet orbiting bright ($V=10.16$) K-dwarf (TIC 466376085) with period 1.27 days. Observations from NASA's Transiting Exoplanet Survey Satellite (TESS) reveal variable transit depths and asymmetric profiles that are characteristic comet-like tails formed by dusty effluents emanating disintegrating planet. Unique to BD+05$\,$4868$\,$Ab is presence prominent dust in both trailing leading directions contribute extinction starlight...
Abstract We present the discovery of TOI-7041 b (TIC 201175570 b), a hot Saturn transiting red giant star with measurable stellar oscillations. observe solar-like oscillations in frequency maximum power <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>ν</mml:mi> </mml:mrow> <mml:mi mathvariant="normal">max</mml:mi> </mml:msub> <mml:mspace width="0.25em"/> <mml:mo>=</mml:mo> </mml:math> 218.50 ± 2.23 μ Hz and large separation Δ ν =...
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 HIRES spectrometer at W. M. Keck Observatory Automated Planet Finder Lick Observatory. Eighty-one were discovered from their transits in photometry, while five found based on subsequent transiting planet host stars. The sizes range Earth-size to larger than Jupiter (1-3 REarth is typical), periods less a day few months. For 32 planets, signal...
Abstract TOI-2818 b is a hot Jupiter orbiting slightly evolved G-type star on 4.04 day orbit that shows transit timing variations (TTVs) suggestive of decreasing orbital period. In the most recent year TESS observations, transits were observed ∼8 minutes earlier than expected for constant The implied decay rate 1.35 ± 0.25 s yr −1 , too fast to be explained by tidal dissipation, even considering nature host star. Radial velocity (RV) monitoring and astrometric data make possibility...
Abstract The “super-puffs” are a population of planets that have masses comparable to Neptune but radii similar Jupiter, leading extremely low bulk densities ( ρ p ≲ 0.2 g cm −3 ) not easily explained by standard core accretion models. Interestingly, several these super-puffs found in orbits significantly misaligned with their host stars’ spin axes, indicating past dynamical excitation may be connected densities. Here, we present new Magellan/Planet Finder Spectrograph radial velocity...
Abstract We present the results of Distant Giants Survey, a 3 yr radial velocity (RV) campaign to search for wide-separation giant planets orbiting Sun-like stars known host an inner transiting planet. defined distant (DG) have = 1–10 au and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mi>p</mml:mi> </mml:msub> <mml:mi>sin</mml:mi> <mml:mi>i</mml:mi> <mml:mo>=</mml:mo> </mml:math> 70–4000 M ⊕ 0.2–12.5 J...
Abstract We report the discovery of BD+05 4868 Ab, a transiting exoplanet orbiting bright ( V = 10.16) K-dwarf (TIC 466376085) with period 1.27 days. Observations from NASA’s Transiting Exoplanet Survey Satellite reveal variable transit depths and asymmetric profiles that are characteristic comet-like tails formed by dusty effluents emanating disintegrating planet. Unique to Ab is presence prominent dust in both trailing leading directions contribute extinction starlight host star. By...
Abstract Hot Jupiters—short-period giant planets—were the first extrasolar planets to be discovered, but many questions about their origin remain. NASA’s Transiting Exoplanet Survey Satellite (TESS), an all-sky search for transiting planets, presents opportunity address these by constructing a uniform sample of hot Jupiters demographic study through new detections and unifying work previous ground-based transit surveys. As results effort build this large we report here discovery 10...
Populating the exoplanet mass-radius diagram in order to identify underlying relationship that governs planet composition is driving an interdisciplinary effort within community. The discovery of hot super-Earths - a high temperature, short-period subset super-Earth population has presented many unresolved questions concerning formation, evolution, and rocky planets. We report transiting, ultra-short period orbiting TOI-1075 (TIC 351601843), nearby ($d$ = 61.4 pc) late K-/early M-dwarf star,...
Despite decades of effort, the mechanisms by which spin axis a star and orbital axes its planets become misaligned remain elusive. Particularly, it is great interest whether large spin-orbit misalignments observed are driven primarily high-eccentricity migration -- expected to have occurred for short-period, isolated or reflect more universal process that operates across systems with variety present-day architectures. Compact multi-planet offer unique opportunity differentiate between these...
ABSTRACT We report the discovery of two transiting planets detected by Transiting Exoplanet Survey Satellite (TESS), TOI-2374 b and TOI-3071 b, orbiting a K5V an F8V star, respectively, with periods 4.31 1.27 d, respectively. confirm characterize these variety ground-based follow-up observations, including photometry, precise radial velocity monitoring high-resolution imaging. The planetary orbital parameters were derived from joint analysis velocities photometric data. found that have...