Emma V. Turtelboom
A5074819338- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Planetary Science and Exploration
- Space Exploration and Technology
- Gamma-ray bursts and supernovae
- High-pressure geophysics and materials
- History and Developments in Astronomy
- Spacecraft and Cryogenic Technologies
- Isotope Analysis in Ecology
- Astronomical and nuclear sciences
- Real-time simulation and control systems
- Astronomical Observations and Instrumentation
- Scientific Research and Discoveries
- Geology and Paleoclimatology Research
- Atmospheric Ozone and Climate
- Space Satellite Systems and Control
- Methane Hydrates and Related Phenomena
- Computational Physics and Python Applications
- Archaeology and ancient environmental studies
- Historical Astronomy and Related Studies
University of California, Berkeley
2021-2024
The University of Sydney
2023
National Postdoctoral Association
2023
Centre de Recerca Matemàtica
2023
University of Hawaii System
2018
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 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...
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,...
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 We present a near-infrared transmission spectrum of the long-period ( P = 542 days), temperate T eq 294 K) giant planet HIP 41378 f obtained with Wide-Field Camera 3 instrument aboard Hubble Space Telescope (HST). With measured mass 12 ± M ⊕ and radius 9.2 0.1 R , has an extremely low bulk density (0.09 0.02 g cm −3 ). measure transit depth median precision 84 ppm in 30 spectrophotometric channels uniformly sized widths 0.018 μ m. Within this level precision, shows no evidence...
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 We present the Distant Giants Survey, a three-year radial velocity campaign to measure P(DG∣CS), conditional occurrence of distant giant planets (DG; M p ∼ 0.3–13 J , P > 1 yr) in systems hosting close-in small planet (CS; R < 10 ⊕ ). For past two years, we have monitored 47 Sun-like stars transiting detected by TESS. selection criteria used assemble our sample and report discovery planets, TOI-1669 b TOI-1694 c. find that <?CDATA $M\sin i=0.573\pm 0.074\,\,{M}_{{\rm{J}}}$?>...
We confirm the planetary nature of a pair transiting sub-Neptune exoplanets orbiting bright F-type sub-giant star TOI-6054 ($V=8.02$, $K=6.673$) as part OrCAS radial velocity survey using WIYN/NEID observations. find that TOI-6054b and TOI-6054c have radii $2.65 \pm 0.15$ $R_{\oplus}$ $2.81 0.18$ $R_{\oplus}$, respectively, masses $12.4 1.7$ $M_{\oplus}$ $9.2 2.0$ $M_{\oplus}$. The planets zero-albedo equilibrium temperatures $1360 33$ K $1144 28$ K. host has expanded will evolve off Main...
Abstract Sub-Neptunes—volatile-rich exoplanets smaller than Neptune—are intrinsically the most common type of planet known. However, formation and nature these objects, as well distinctions between subclasses (if any), remain unclear. Two powerful tools to tease out secrets worlds are measurements (i) atmospheric composition structure revealed by transit and/or eclipse spectroscopy, (ii) mass, radius, density photometry Doppler spectroscopy. Here, we present OrCAS, a survey better elucidate...
We report the discovery, mass, and radius determination of TOI-1801 b, a temperate mini-Neptune around young M dwarf. b was observed in TESS sectors 22 49, alert that this planet candidate with period 21.3 days went out April 2020. However, ground-based follow-up observations, including seeing-limited photometry outside transit together precise radial velocity (RV) measurements CARMENES HIRES revealed true is 10.6 days. These observations also allowed us to retrieve mass 5.74 ± 1.46 ⊕ ,...
Abstract We present and confirm TOI-1751 b, a transiting sub-Neptune orbiting slightly evolved, solar-type, metal-poor star ( T eff = 5996 ± 110 K, <?CDATA $\mathrm{log}(g)=4.2\pm 0.1$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>log</mml:mi> <mml:mo stretchy="false">(</mml:mo> <mml:mi>g</mml:mi> stretchy="false">)</mml:mo> <mml:mo>=</mml:mo> <mml:mn>4.2</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.1</mml:mn> </mml:math> , V 9.3 mag, [Fe/H] −0.40 0.06 dex)...
Abstract Hot Neptunes, gaseous planets smaller than Saturn (∼3–8 R ⊕ ) with orbital periods less 10 days, are rare. Models predict this is due to high-energy stellar irradiation stripping planetary atmospheres over time, often leaving behind only rocky cores. Using our TESS full-frame-image pipeline giants in conjunction Keck/HIRES radial velocity measurements, we present the discovery of TIC365102760 b, a 6.2 (0.55 J ), 19.2 M (0.060 planet transiting red giant star every 4.21285 days. The...
Abstract We present optical spectroscopy of 710 solar neighborhood stars collected over 20 years to catalog chromospheric activity and search for stellar cycles. The California Legacy Survey are amenable exoplanet detection using precise radial velocities, we their Ca ii H K time series as a proxy activity. Using the High Resolution Echelle Spectrometer at Keck Observatory, measured flux in cores lines determine S -values on Mount Wilson scale <mml:math...
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 With JWST’s successful deployment and unexpectedly high fuel reserves, measuring the masses of sub-Neptunes transiting bright, nearby stars will soon become bottleneck for characterizing atmospheres small exoplanets via transmission spectroscopy. Using a carefully curated target list observations from more than 2 yr APF-Levy Keck-HIRES Doppler monitoring, TESS-Keck Survey is working toward alleviating this pressure. Here we present mass measurements 11 planets in eight systems that...
Abstract Moons orbiting exoplanets (“exomoons”) may hold clues about planet formation, migration, and habitability. In this work, we investigate the plausibility of exomoons temperate ( T eq = 294 K) giant R 9.2 ⊕ ) HIP 41378 f, which has been shown to have a low apparent bulk density 0.09 g cm −3 flat near-infrared transmission spectrum, hinting that it possess circumplanetary rings. Given planet’s long orbital period P ≈ 1.5 yr), suggested also host large exomoon. Here, analyze stability...
Multi-planet systems are valuable arenas for investigating exoplanet architectures and comparing planetary siblings. TOI-1246 is one such system, with a moderately bright K dwarf ($\rm{V=11.6,~K=9.9}$) four transiting sub-Neptunes identified by TESS orbital periods of $4.31~\rm{d},~5.90~\rm{d},~18.66~\rm{d}$, $~37.92~\rm{d}$. We collected 130 radial velocity observations Keck/HIRES TNG/HARPS-N to measure planet masses. refit the 14 sectors photometry refine radii ($\rm{2.97 \pm...
K2-136 is a late-K dwarf ($0.742\pm0.039$ M$_\odot$) in the Hyades open cluster with three known, transiting planets and an age of $650\pm70$ Myr. Analyzing K2 photometry, we found that K2-136b, c, d have periods $8.0$, $17.3$, $25.6$ days radii $1.014\pm0.050$ R$_\oplus$, $3.00\pm0.13$ $1.565\pm0.077$ respectively. We collected 93 radial velocity measurements (RVs) HARPS-N spectrograph (TNG) 22 RVs ESPRESSO (VLT). data jointly, K2-136c induced semi-amplitude $5.49\pm0.53$ m s$^{-1}$,...
Abstract We present the stellar and planetary properties for 85 TESS Objects of Interest (TOIs) hosting 108 planet candidates that compose TESS-Keck Survey (TKS) sample. combine photometry, high-resolution spectroscopy, Gaia parallaxes to measure precise accurate properties. then use these parameters as inputs a light-curve processing pipeline recover signals homogeneously fit their transit Among fits, we detect significant transit-timing variations among at least three multiplanet systems...
Abstract We collected near-infrared spectra of 65 cool stars with the NASA Infrared Telescope Facility and analyzed them to calculate accurate metallicities stellar parameters. The sample 55 M dwarfs 10 K includes 25 systems confirmed planets 27 planet candidates identified by K2 TESS missions. Three planetary host multiple two candidate candidates. Using new parameters, we refit light curves updated properties. In general, our properties are more precise than those previously reported agree...
Abstract We confirm a massive sub-Neptune-sized planet on P = 22.8 days orbit around the star TOI-1824 ( T eff 5200 K, V 9.7 mag). TESS first identified b (formerly TOI-1824.01) as an object of interest in 2020 April after two transits Sector 22 were matched with single transit 21. was subsequently targeted for ground-based Doppler monitoring Keck-HIRES and APF-Levy. Using joint model photometry, radial velocities, Ca ii H K emission measurements activity indicator, we find that is unusually...