Corey Beard
A5027895732- 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
- Planetary Science and Exploration
- Space Exploration and Technology
- Scientific Research and Discoveries
- Astronomical and nuclear sciences
- Spacecraft and Cryogenic Technologies
- Atmospheric Ozone and Climate
- Adaptive optics and wavefront sensing
- High-pressure geophysics and materials
- Astrophysical Phenomena and Observations
- Laser-Ablation Synthesis of Nanoparticles
- Calibration and Measurement Techniques
- Methane Hydrates and Related Phenomena
- Spectroscopy and Laser Applications
- Silicon Nanostructures and Photoluminescence
- Geomagnetism and Paleomagnetism Studies
- Archaeology and ancient environmental studies
- Laser-induced spectroscopy and plasma
- Semiconductor Lasers and Optical Devices
- Space Satellite Systems and Control
University of California, Irvine
2020-2024
Convergent disk migration has long been suspected to be responsible for forming planetary systems with a chain of mean-motion resonances (MMR). Dynamical evolution over time could disrupt the delicate resonant configuration. We present TOI-1136, 700-Myr-old G star hosting at least 6 transiting planets between $\sim$2 and 5 $R_\oplus$. The orbital period ratios deviate from exact commensurability by only $10^{-4}$, smaller than $\sim$\,$10^{-2}$ deviations seen in typical Kepler near-resonant...
Mass, radius, and age measurements of young (<100 Myr) planets have the power to shape our understanding planet formation. However, stars tend be extremely variable in both photometry radial velocity, which makes constraining these properties challenging. The V1298 Tau system four ~0.5 Rjup transiting a pre-main sequence star presents an important, if stress-inducing, opportunity directly observe measure infant planets. Su\'arez-Mascare\~no et al. (2021) published radial-velocity-derived...
TOI-561 is a galactic thick disk star hosting an ultra-short period (0.45 day orbit) planet with radius of 1.37 R$_{\oplus}$, making it one the most metal-poor ([Fe/H] = -0.41) and oldest ($\sim$10 Gyr) sites where Earth-sized has been found. We present new simultaneous radial velocity measurements (RVs) from Gemini-N/MAROON-X Keck/HIRES, which we combined literature RVs to derive mass M$_{b}$=2.24 $\pm$ 0.20 M$_{\oplus}$. also used two Sectors TESS photometry improve determination, finding...
Abstract Despite the importance of Jupiter and Saturn to Earth’s formation habitability, there has not yet been a comprehensive observational study how giant exoplanets correlate with architectural properties close-in, sub-Neptune-sized exoplanets. This is largely because transit surveys are particularly insensitive planets at orbital separations ≳1 au, so their census Jupiter-like incomplete, inhibiting our relationship between small that do transit. To investigate distant, planets, we...
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...
We validate the discovery of a 2 Earth radii sub-Neptune-size planet around nearby high proper motion M2.5-dwarf G 9-40 (EPIC 212048748), using high-precision near-infrared (NIR) radial velocity (RV) observations with Habitable-zone Planet Finder (HPF), precision diffuser-assisted ground-based photometry custom narrow-band photometric filter, and adaptive optics imaging. At distance $d=27.9\mathrm{pc}$, 9-40b is second closest transiting discovered by K2 to date. The planet's large transit...
Abstract LTT 1445 is a hierarchical triple M-dwarf star system located at distance of 6.86 pc. The primary 1445A (0.257 M ⊙ ) known to host the transiting planet 1445Ab with an orbital period 5.36 days, making it second-closest exoplanet system, and closest one for which dwarf. Using Transiting Exoplanet Survey Satellite data, we present discovery second in 3.12 days. We combine radial-velocity measurements obtained from five spectrographs, Echelle Spectrograph Rocky Exoplanets Stable...
We present spectroscopic measurements of the Rossiter-McLaughlin effect for WASP-148b, only known hot Jupiter with a nearby warm-Jupiter companion, from WIYN/NEID and Keck/HIRES instruments. This is one first scientific results reported newly commissioned NEID spectrograph, as well second obliquity constraint system close-in after WASP-47. WASP-148b consistent being in alignment sky-projected spin axis host star, $\lambda=-8^{\circ}.2^{{+8^{\circ}.7}}_{-9^{\circ}.7}$. The low observed...
We confirm the planetary nature of two gas giants discovered by TESS to transit M dwarfs. TOI-3714 ($V=15.24,~J=11.74$) is an M2 dwarf hosting a hot Jupiter ($M_p=0.70 \pm 0.03~\mathrm{M_J}$ and $R_p=1.01 0.03~\mathrm{R_J}$) on orbital period $2.154849 0.000001$ days with resolved white companion. TOI-3629 ($V=14.63,~J=11.42$) M1 ($M_p=0.26 0.02~\mathrm{M_J}$ $R_p=0.74 0.02~\mathrm{R_J}$) $3.936551_{-0.000006}^{+0.000005}$ days. characterize each transiting companion using combination...
Giant planets on short-period orbits are predicted to be inflated and eventually engulfed by their host stars. However, the detailed timescales stages of these processes not well known. Here we present discovery three hot Jupiters (P $<$ 10 d) orbiting evolved, intermediate-mass stars ($M_\star$ $\approx$ 1.5 M$_\odot$, 2 R$_\odot$ $R_\star < $ 5 R$_\odot$). By combining \tess photometry with ground-based radial velocity measurements, report masses radii for between 0.4 1.8 M$_\mathrm{J}$...
Abstract The Kepler and TESS missions have demonstrated that planets are ubiquitous. However, the success of these heavily depends on ground-based radial velocity (RV) surveys, which combined with transit photometry can yield bulk densities orbital properties. While most host stars too faint for detailed follow-up observations, is detecting orbiting nearby bright more amenable to RV characterization. Here, we introduce TESS-Keck Survey (TKS), an program using ∼100 nights Keck/HIRES study...
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 We measured the Rossiter–McLaughlin effect of WASP-107b during a single transit with Keck/HIRES. found sky-projected inclination WASP-107b’s orbit, relative to its host star’s rotation axis, be degrees. This confirms misaligned/polar orbit that was previously suggested from spot-crossing events and adds growing population hot Neptunes in polar orbits around cool stars. is also fourth such planet have known distant planetary companion. examined several dynamical pathways by which...
We report the discovery of TOI-561, a multi-planet system in galactic thick disk that contains rocky, ultra-short period planet (USP). This bright ($V=10.2$) star hosts three small transiting planets identified photometry from NASA TESS mission: TOI-561 b (TOI-561.02, P=0.44 days, $R_b = 1.45\pm0.11\,R_\oplus$), c (TOI-561.01, P=10.8 $R_c=2.90\pm0.13\,R_\oplus$), and d (TOI-561.03, P=16.3 $R_d=2.32\pm0.16\,R_\oplus$). The is chemically ([Fe/H]$=-0.41\pm0.05$, [$\alpha$/H]$=+0.23\pm0.05$)...
Abstract Barnard’s star is among the most studied stars given its proximity to Sun. It often considered radial velocity (RV) standard for fully convective due RV stability and equatorial decl. Recently, an <?CDATA $M\sin i=3.3{M}_{\oplus }$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>M</mml:mi> <mml:mi>sin</mml:mi> <mml:mi>i</mml:mi> <mml:mo>=</mml:mo> <mml:mn>3.3</mml:mn> <mml:msub> <mml:mrow> </mml:mrow> <mml:mo>⊕</mml:mo> </mml:msub> </mml:math>...
Abstract Exoplanet systems with multiple transiting planets are natural laboratories for testing planetary astrophysics. One such system is HD 191939 (TOI 1339), a bright ( V = 9) and Sun-like (G9V) star, which TESS found to host three (b, c, d). The have periods of 9, 29, 38 days each similar sizes from 3 3.4 R ⊕ . To further characterize the system, we measured radial velocity (RV) over 415 Keck/HIRES APF/Levy. We find that M b 10.4 ± 0.9 c 7.2 1.4 , low compared most known comparable...
We report the discovery of TOI-2180 b, a 2.8 $M_{\rm J}$ giant planet orbiting slightly evolved G5 host star. This transited only once in Cycle 2 primary Transiting Exoplanet Survey Satellite (TESS) mission. Citizen scientists identified 24 hr single-transit event shortly after data were released, allowing Doppler monitoring campaign with Automated Planet Finder telescope at Lick Observatory to begin promptly. The radial velocity observations refined orbital period b be 260.8$\pm$0.6 days,...
We present the discovery of a new Jovian-sized planet, TOI-3757 b, lowest density planet orbiting an M dwarf (M0V). It orbits solar-metallicity discovered using TESS photometry and confirmed with precise radial velocities (RV) from HPF NEID. With planetary radius $12.0^{+0.4}_{-0.5}$ $R_{\oplus}$ mass $85.3^{+8.8}_{-8.7}$ $M_{\oplus}$, not only does this object add to small sample gas giants ($\sim 10$) around dwarfs, but also, its low ($\rho =$ $0.27^{+0.05}_{-0.04}$ $\textrm{g~cm}^{-3}$)...
We confirm the planetary nature of two gas giants discovered by TESS to transit M dwarfs with stellar companions at wide separations. TOI-3984 A ($J=11.93$) is an M4 dwarf hosting a short-period ($4.353326 \pm 0.000005$ days) giant ($M_p=0.14\pm0.03~\mathrm{M_{J}}$ and $R_p=0.71\pm0.02~\mathrm{R_{J}}$) separation white companion. TOI-5293 ($J=12.47$) M3 ($2.930289 0.000004$ ($M_p=0.54\pm0.07~\mathrm{M_{J}}$ $R_p=1.06\pm0.04~\mathrm{R_{J}}$) characterize both systems using combination...
Abstract We present a radial velocity (RV) analysis of TOI-1136, bright Transiting Exoplanet Survey Satellite (TESS) system with six confirmed transiting planets, and seventh single-transiting planet candidate. All planets in the are amenable to transmission spectroscopy, making TOI-1136 one best targets for intra-system comparison exoplanet atmospheres. is young (∼700 Myr), exhibits transit timing variations (TTVs). The youth contributes high stellar variability on order 50 m s −1 , much...
Abstract The degree of alignment between a star’s spin axis and the orbital plane its planets (the stellar obliquity) is related to interesting poorly understood processes that occur during planet formation evolution. Hot Jupiters orbiting hot stars (≳6250 K) display wide range obliquities, while similar cool are preferentially aligned. Tidal dissipation expected be more rapid in with thick convective envelopes, potentially explaining this trend. Evolved provide an opportunity test damping...
Abstract Young, rapidly rotating M dwarfs exhibit prominent starspots, which create quasiperiodic signals in their photometric and Doppler spectroscopic measurements. The periodic can mimic radial velocity (RV) changes expected from orbiting exoplanets. Exoplanets be distinguished activity-induced false positives by the chromaticity long-term incoherence of starspot signals, but these qualities are poorly constrained for fully convective stars. Coherent on may persist hundreds rotations,...
We report the detection of a Saturn-size exoplanet orbiting HD 332231 (TOI 1456) in light curves from Transiting Exoplanet Survey Satellite (TESS). 332231, an F8 dwarf star with V-band magnitude 8.56, was observed by TESS Sectors 14 and 15. detect single-transit event Sector 15 presearch data conditioning (PDC) curve. obtain spectroscopic follow-up observations Automated Planet Finder, Keck I, SONG telescopes. The orbital period we infer radial velocity (RV) leads to discovery another...
Abstract We report the discovery of TOI-1444b, a 1.4 R ⊕ super-Earth on 0.47 day orbit around Sun-like star discovered by TESS. Precise radial velocities from Keck/HIRES confirmed planet and constrained mass to be 3.87 ± 0.71 M . The RV data set also indicates possible nontransiting, 16 (11.8 2.9 ). tentative detection phase-curve variation secondary eclipse TOI-1444b in TESS bandpass. joins growing sample 17 ultra-short-period planets (USPs) with well-measured masses sizes, most which are...