Tara Fetherolf
A5091366659- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Space Exploration and Technology
- Planetary Science and Exploration
- Adaptive optics and wavefront sensing
- Astronomical and nuclear sciences
- History and Developments in Astronomy
- Scientific Research and Discoveries
- Astrophysical Phenomena and Observations
- Solar and Space Plasma Dynamics
- Spacecraft and Cryogenic Technologies
- Gaussian Processes and Bayesian Inference
- Species Distribution and Climate Change
- Space exploration and regulation
- Spacecraft Design and Technology
- Plant Water Relations and Carbon Dynamics
- Calibration and Measurement Techniques
- Spectroscopy and Chemometric Analyses
- Space Science and Extraterrestrial Life
- Dark Matter and Cosmic Phenomena
University of California, Riverside
2018-2024
California State University, San Marcos
2024
San Diego State University
2011-2012
The Kepler Mission provides nearly continuous monitoring of ~156 000 objects with unprecedented photometric precision. Coincident the first data release, we presented a catalog 1879 eclipsing binary systems identified within 115 square degree FOV. Here, provide an updated augmented second release which increases baseline 4-fold to 125 days. 386 new have been added, ephemerides and principle parameters recomputed. We removed 42 previously cataloged that are now clearly recognized as...
We present detections of [OIII]$\lambda$4363 and direct-method metallicities for star-forming galaxies at $z=1.7-3.6$. combine new measurements from the MOSFIRE Deep Evolution Field (MOSDEF) survey with literature sources to construct a sample 18 $z>1$, spanning $7.5<1$2+log(O/H$)<8.2$ log(M$_*$/M$_{\odot})=7-10$. find that strong-line calibrations based on local analogs high-redshift reliably reproduce metallicity $z>1$ average. first mass-metallicity relation purely O/H, finding slope is...
Abstract The search for habitable planets has revealed many that can vary greatly from an Earth analog environment. These include highly eccentric orbits, giant planets, different bulk densities, relatively active stars, and evolved stars. This work catalogs all found to reside in the zone (HZ) provides HZ boundaries, orbit characterization, potential spectroscopic follow-up observations. Demographics of are compared with a full catalog exoplanets. Extreme within highlighted, how their...
Abstract We derive a UV-optical stellar dust attenuation curve of galaxies at z = 1.4–2.6 as function gas-phase metallicity. use sample 218 star-forming galaxies, excluding those with very young or heavily obscured star formation, from the MOSFIRE Deep Evolution Field survey H α , β and [N ii ] λ 6585 spectroscopic measurements. constrain shape by comparing average flux densities sorted into bins obscuration using Balmer decrements, i.e., -to-H luminosities. The for high-metallicity (...
We carried out a systematic study of full-orbit phase curves for known transiting systems in the northern ecliptic sky that were observed during Year 2 TESS primary mission. applied same methodology target selection, data processing, and light-curve fitting as we did our 1 study. Out 15 selected analysis, seven - HAT-P-7, KELT-1, KELT-9, KELT-16, KELT-20, Kepler-13A, WASP-12 show statistically significant secondary eclipses day-night atmospheric brightness modulations. Small eastward dayside...
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...
Abstract During its 2 yr Prime Mission, TESS observed over 232,000 stars at a minute cadence across ∼70% of the sky. These data provide record photometric variability range astrophysically interesting timescales, probing stellar rotation, binarity, and pulsations. We have analyzed light curves to identify periodic on timescales 0.01–13 days, explored results various properties. identified 46,000 variables with high confidence, another 38,000 moderate confidence. show differences in type...
Using data from the MOSFIRE Deep Evolution Field (MOSDEF) survey, we present a census of AGN-driven ionized outflows in sample 159 AGNs at $1.4 \le z 3.8$. The spans AGN bolometric luminosities $10^{44-47} \mathrm{~erg~s}^{-1}$ and includes both quiescent star-forming galaxies extending across three orders magnitude stellar mass. We identify characterize \hbeta, [OIII], \halpha ~and [NII] emission line spectra. detect $17\%$ AGNs, seven times more often than mass-matched inactive MOSDEF. are...
Abstract We carry out a phase-curve analysis of the KELT-9 system using photometric observations from NASA’s Transiting Exoplanet Survey Satellite (TESS). The measured secondary eclipse depth and peak-to-peak atmospheric brightness modulation are <?CDATA ${650}_{-15}^{+14}$?> 566 ± 16 ppm, respectively. planet’s variation reaches maximum 31 5 minutes before midpoint eclipse, indicating 5.°2 0.°9 eastward shift in dayside hot spot substellar point. also detect stellar pulsations on with...
We analyze the rest-optical emission-line spectra of $z\sim2.3$ star-forming galaxies in complete MOSFIRE Deep Evolution Field (MOSDEF) survey. In investigating origin well-known offset between sequences high-redshift and local [O III]5008/H$\beta$ vs. [N II]6585/H$\alpha$ ("[N II] BPT") diagram, we define two populations MOSDEF galaxies. These include "high" population that is towards higher and/or with respect to SDSS sequence "low" overlaps sequence. groups are also segregated within [S...
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...
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 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 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...
We combine spectroscopic measurements of H$\alpha$ and H$\beta$ UV continuum photometry for a sample 673 galaxies from the MOSFIRE Deep Evolution Field survey to constrain hydrogen ionizing photon production efficiencies ($\xi_{\rm ion}$, xi_ion) at z=1.4-2.6. find average log(xi_ion/[Hz erg$^{-1}$])=25.06 (25.34), assuming Calzetti (SMC) curve dust correction scatter 0.28 dex in xi_ion distribution. After accounting observational uncertainties variations attenuation, we conclude that...
Abstract We present results on the emission-line properties of 1.3 ≤ z 2.7 galaxies drawn from complete MOSFIRE Deep Evolution Field (MOSDEF) survey. Specifically, we use observations diagnostic diagram [O iii ] λ 5007/H β versus [S ii λλ 6717,6731/H α , i.e., “[S BPT diagram,” to gain insight into physical high-redshift star-forming regions. High-redshift MOSDEF are offset toward lower at fixed relative local Sloan Digital Sky Survey (SDSS). Furthermore, SDSS follow a trend decreasing as...
Abstract We present a visible-light full orbital phase curve of the transiting planet WASP-18b measured by TESS mission. The includes transit, secondary eclipse, and sinusoidal modulations across shaped planet’s atmospheric characteristics star–planet gravitational interaction. measure beaming (Doppler boosting) tidal ellipsoidal distortion show that amplitudes both agree with theoretical expectations. find light from dayside hemisphere occulted during relative brightness <?CDATA...
We analyze the phase curve of short-period transiting hot Jupiter system WASP-19, which was observed by Transiting Exoplanet Survey Satellite ($TESS$) in Sector 9. WASP-19 is one only five exoplanet systems with full-orbit measurements at both optical and infrared wavelengths. measure a secondary eclipse depth $470^{+130}_{-110}$ ppm detect strong atmospheric brightness modulation signal semi-amplitude $319\pm51$ ppm. No significant offset detected between substellar point region maximum on...
We study the red-optical photometry of ultra-hot Jupiter WASP-121 b as observed by Transiting Exoplanet Survey Satellite (TESS) and model its atmosphere through a radiative transfer simulation. Given short orbital period $\sim1.275$ days, inflated state bright host star, is exceptionally favorable for detailed atmospheric characterization. Towards this purpose, we use \texttt{allesfitter} to characterize full phase curve, including planetary modulation secondary eclipse. measure day...
We report the discovery of two planetary systems around comoving stars; TOI-2076 (TIC 27491137) and TOI-1807 180695581). is a nearby (41.9 pc) multi-planetary system orbiting young (204$\pm$50 Myr), bright (K = 7.115 in TIC v8.1). hosts single transiting planet, similarly (42.58pc), (180$\pm$40 bright. Both targets exhibit significant, periodic variability due to star spots, characteristic their ages. Using photometric data collected by TESS we identify three planets with radii...
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...
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,...
Understanding the physical characteristics of Venus, including its atmosphere, interior, and evolutionary pathway with respect to Earth, remains a vital component for terrestrial planet evolution models emergence and/or decline planetary habitability. A statistical strategy evaluating pathways planets lies in atmospheric characterization exoplanets, where sample size provides sufficient means determining required runaway greenhouse conditions. Observations potential exoVenuses can help...
Abstract The planned NASA Habitable Worlds Observatory (HWO) flagship mission aims to image and spectroscopically characterise 25 Earth-size planets in the habitable zones of their stars. However, one giant planet zone can ruin your whole day. Recent work has examined current state our knowledge on presence or absence such objects samples likely HWO targets, that been found wanting; even Saturn-mass remain undetectable many these systems. In this work, we present simulations assessing degree...
The planned NASA Habitable Worlds Observatory (HWO) flagship mission aims to image and spectroscopically characterise 25 Earth-size planets in the habitable zones of their stars. However, one giant planet zone can ruin your whole day. Recent work has examined current state our knowledge on presence or absence such objects samples likely HWO targets, that been found wanting; even Saturn-mass remain undetectable many these systems. In this work, we present simulations assessing degree which...