Robert A. Wittenmyer
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Author Swipe
View article: SPORES-HWO. II. Companion Mass Limits and Updated Planet Properties for 120 Future Exoplanet Imaging Targets from 35 yr of Precise Doppler Monitoring <sup>∗</sup>
SPORES-HWO. II. Companion Mass Limits and Updated Planet Properties for 120 Future Exoplanet Imaging Targets from 35 yr of Precise Doppler Monitoring <sup>∗</sup> Open
A goal of the future Habitable Worlds Observatory (HWO) is to directly image and spectroscopically characterize true Earth-analogs. However, if a large fraction of HWO target stars host unknown dynamically disruptive giant planets in their…
View article: Exploring Warm Jupiter Migration Pathways with Eccentricities. I. Catalog of Uniform Keplerian Fits to Radial Velocities of 200 Warm Jupiters
Exploring Warm Jupiter Migration Pathways with Eccentricities. I. Catalog of Uniform Keplerian Fits to Radial Velocities of 200 Warm Jupiters Open
Giant planets are expected to predominantly form beyond the water ice line and occasionally undergo inward migration. Unlike hot Jupiters, which can result from high-eccentricity tidal migration, warm Jupiters between 0.1-1 AU ($\approx$10…
View article: Exploring Warm Jupiter Migration Pathways with Eccentricities. I. Catalog of Uniform Keplerian Fits to Radial Velocities of 200 Warm Jupiters
Exploring Warm Jupiter Migration Pathways with Eccentricities. I. Catalog of Uniform Keplerian Fits to Radial Velocities of 200 Warm Jupiters Open
Giant planets are expected to predominantly form beyond the water-ice line and occasionally undergo inward migration. Unlike hot Jupiters, which can result from high-eccentricity tidal migration, warm Jupiters between 0.1 and 1 au (≈10–365…
View article: Sub-Jupiter Gas Giants Orbiting Giant Stars Uncovered using a Bayesian Framework
Sub-Jupiter Gas Giants Orbiting Giant Stars Uncovered using a Bayesian Framework Open
Giant stars have been shown to be rich hunting grounds for those aiming to detect giant planets orbiting beyond ~0.5 AU. Here we present two planetary systems around bright giant stars, found by combining the radial-velocity (RV) measureme…
View article: The Spin–orbit alignment of two short period eclipsing binary systems
The Spin–orbit alignment of two short period eclipsing binary systems Open
We present a joint analysis of TESS photometry and radial velocity measurements obtained from the Minerva–Australis facility for two short-period eclipsing binaries, TIC 48227288 and TIC 339607421. TIC 339607421 hosts an M-dwarf companion …
View article: A high mutual inclination system around KOI-134 revealed by transit timing variations
A high mutual inclination system around KOI-134 revealed by transit timing variations Open
View article: The NEID Earth Twin Survey. II. Dynamical Masses in Seven High-acceleration Star Systems
The NEID Earth Twin Survey. II. Dynamical Masses in Seven High-acceleration Star Systems Open
We present a set of companion dynamical masses and orbital parameters of seven star systems from the NEID Earth Twin Survey with significant absolute astrometric accelerations between the epochs of Hipparcos and Gaia. These include four bi…
View article: Asteroseismology of the G8 subgiant <i>β</i> Aquilae with SONG-Tenerife, SONG-Australia and TESS
Asteroseismology of the G8 subgiant <i>β</i> Aquilae with SONG-Tenerife, SONG-Australia and TESS Open
Aims. We present time-series radial velocities of the G8 subgiant star β Aql obtained in 2022 and 2023 using SONG-Tenerife and, for the first time, SONG-Australia. We also analyse a sector of TESS photometry that overlapped with the 2022 S…
View article: Exoplanets in the Antarctic Sky. V. The Second Data Release of AST3-II/CHESPA and Newly Found Variables within the Southern Continuous Viewing Zone of TESS
Exoplanets in the Antarctic Sky. V. The Second Data Release of AST3-II/CHESPA and Newly Found Variables within the Southern Continuous Viewing Zone of TESS Open
Located at Dome A, the highest point on the Antarctic plateau, China’s Kunlun station is a premier ground-based photometric observatory. Its cold, dry, and stable atmosphere allows continuous observation for over 40 days during polar winte…
View article: Three-dimensional Orbit and Dynamical Masses of GJ 105 AC
Three-dimensional Orbit and Dynamical Masses of GJ 105 AC Open
The precision of stellar models is higher than the precision at which we are able to measure the masses of most stars, with the notable exception of binaries where we can determine dynamical masses of the component stars. In addition to we…
View article: Optimizing radial velocity detection limits for Southern Habitable Worlds Observatory targets
Optimizing radial velocity detection limits for Southern Habitable Worlds Observatory targets Open
The planned NASA Habitable Worlds Observatory (HWO) flagship mission aims to image and spectroscopically characterize 25 Earth-sized planets in the habitable zones of their stars. However, one giant planet in the habitable zone can ruin yo…
View article: Optimising Radial Velocity Detection Limits for Southern Habitable Worlds Observatory Targets
Optimising Radial Velocity Detection Limits for Southern Habitable Worlds Observatory Targets Open
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 in the habitable zone can ruin you…
View article: Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581*
Two Earth-size Planets and an Earth-size Candidate Transiting the nearby Star HD 101581* Open
We report the validation of multiple planets transiting the nearby ( d = 12.8 pc) K5V dwarf HD 101581 (GJ 435, TOI–6276, TIC 397362481). This system consists of at least two Earth-size planets whose orbits are near a mutual 4:3 mean-motion…
View article: Two Earth-size Planets and an Earth-size Candidate Transiting the Nearby Star HD 101581
Two Earth-size Planets and an Earth-size Candidate Transiting the Nearby Star HD 101581 Open
We report the validation of multiple planets transiting the nearby ($d = 12.8$ pc) K5V dwarf HD 101581 (GJ 435, TOI-6276, TIC 397362481). The system consists of at least two Earth-size planets whose orbits are near a mutual 4:3 mean-motion…
View article: The Search for the In-betweeners: How Packed Are TESS Planetary Systems?
The Search for the In-betweeners: How Packed Are TESS Planetary Systems? Open
In this work, we examine seven systems discovered by TESS, to see whether there is any room in those systems for an additional planet (or several) to lurk unseen between the two planets already confirmed therein. In five of those systems (…
View article: The Search for the Inbetweeners: How packed are TESS planetary systems?
The Search for the Inbetweeners: How packed are TESS planetary systems? Open
In this work, we examine seven systems discovered by TESS, to see whether there is any room in those systems for an additional planet (or several) to lurk unseen between the two planets already confirmed therein. In five of those systems (…
View article: HD 28185 revisited: an outer planet, instead of a brown dwarf, on a Saturn-like orbit
HD 28185 revisited: an outer planet, instead of a brown dwarf, on a Saturn-like orbit Open
As exoplanet surveys reach ever-higher sensitivities and durations, planets analogous to the Solar system giant planets are increasingly within reach. HD 28185 is a Sun-like star known to host a $m\sin i=6~M_\mathrm{ J}$ planet on an Earth…
View article: The GALAH Survey: Data Release 4
The GALAH Survey: Data Release 4 Open
The stars of the Milky Way carry the chemical history of our Galaxy in their atmospheres as they journey through its vast expanse. Like barcodes, we can extract the chemical fingerprints of stars from high-resolution spectroscopy. The four…
View article: HD 222237 b: a long-period super-Jupiter around a nearby star revealed by radial-velocity and <i>Hipparcos–Gaia</i> astrometry
HD 222237 b: a long-period super-Jupiter around a nearby star revealed by radial-velocity and <i>Hipparcos–Gaia</i> astrometry Open
Giant planets on long-period orbits around the nearest stars are among the easiest to directly image. Unfortunately these planets are difficult to fully constrain by indirect methods, e.g. transit and radial velocity (RV). In this study, w…
View article: HD 222237 b: a long period super-Jupiter around a nearby star revealed by radial-velocity and Hipparcos-Gaia astrometry
HD 222237 b: a long period super-Jupiter around a nearby star revealed by radial-velocity and Hipparcos-Gaia astrometry Open
Giant planets on long period orbits around the nearest stars are among the easiest to directly image. Unfortunately these planets are difficult to fully constrain by indirect methods, e.g., transit and radial velocity (RV). In this study, …
View article: HD 21520 b: a warm sub-Neptune transiting a bright G dwarf
HD 21520 b: a warm sub-Neptune transiting a bright G dwarf Open
We report the discovery and validation of HD 21520 b, a transiting planet found with Transiting Exoplanet Survey Satellite and orbiting a bright G dwarf (V = 9.2, $T_{\rm eff} = 5871 \pm 62$ K, $R_{\star } = 1.04\pm 0.02\, {\rm R}_{\odot }…
View article: Searching for Neutral Hydrogen Escape from the 120 Myr Old Sub-Neptune HIP94235b using HST
Searching for Neutral Hydrogen Escape from the 120 Myr Old Sub-Neptune HIP94235b using HST Open
HIP94235 b, a 120 Myr old sub-Neptune, provides us the unique opportunity to study mass loss at a pivotal stage of the system’s evolution: the end of a 100 Myr old phase of intense XUV irradiation. We present two observations of HIP94235 b…
View article: Surviving in the Hot-Neptune Desert: The Discovery of the Ultrahot Neptune TOI-3261b
Surviving in the Hot-Neptune Desert: The Discovery of the Ultrahot Neptune TOI-3261b Open
The recent discoveries of Neptune-sized ultra-short-period planets (USPs) challenge existing planet formation theories. It is unclear whether these residents of the Hot Neptune Desert have similar origins to smaller, rocky USPs, or if this…
View article: Trials and Tribulations in the Reanalysis of KELT-24 b: A Case Study for the Importance of Stellar Modeling
Trials and Tribulations in the Reanalysis of KELT-24 b: A Case Study for the Importance of Stellar Modeling Open
We present a new analysis of the KELT-24 system, comprising a well-aligned hot Jupiter, KELT-24 b, and a bright ( V = 8.3), nearby ( d = 96.9 pc) F-type host star. KELT-24 b was independently discovered by two groups in 2019, with each rep…
View article: Searching for Neutral Hydrogen Escape from the 120 Myr Old Sub-Neptune HIP94235b using HST
Searching for Neutral Hydrogen Escape from the 120 Myr Old Sub-Neptune HIP94235b using HST Open
HIP94235 b, a 120 Myr old sub-Neptune, provides us the unique opportunity to study mass loss at a pivotal stage of the system's evolution: the end of a 100 million year (Myr) old phase of intense XUV irradiation. We present two observation…
View article: Surviving in the Hot Neptune Desert: The Discovery of the Ultra-Hot Neptune TOI-3261b
Surviving in the Hot Neptune Desert: The Discovery of the Ultra-Hot Neptune TOI-3261b Open
The recent discoveries of Neptune-sized ultra-short period planets (USPs) challenge existing planet formation theories. It is unclear whether these residents of the Hot Neptune Desert have similar origins to smaller, rocky USPs, or if this…
View article: HD 21520 b: a warm sub-Neptune transiting a bright G dwarf
HD 21520 b: a warm sub-Neptune transiting a bright G dwarf Open
We report the discovery and validation of HD 21520 b, a transiting planet found with TESS and orbiting a bright G dwarf (V=9.2, $T_{eff} = 5871 \pm 62$ K, $R_{\star} = 1.04\pm 0.02\, R_{\odot}$). HD 21520 b was originally alerted as a syst…
View article: Trials and Tribulations in the Reanalysis of KELT-24 b: a Case Study for the Importance of Stellar Modeling
Trials and Tribulations in the Reanalysis of KELT-24 b: a Case Study for the Importance of Stellar Modeling Open
We present a new analysis of the KELT-24 system, comprising a well-aligned hot Jupiter, KELT-24~b, and a bright ($V=8.3$), nearby ($d=96.9~\mathrm{pc}$) F-type host star. KELT-24~b was independently discovered by two groups in 2019, with e…
View article: Gliese 12 b, A Temperate Earth-sized Planet at 12 Parsecs Discovered with TESS and CHEOPS
Gliese 12 b, A Temperate Earth-sized Planet at 12 Parsecs Discovered with TESS and CHEOPS Open
We report on the discovery of Gliese 12 b, the nearest transiting temperate, Earth-sized planet found to date. Gliese 12 is a bright ($V=12.6$ mag, $K=7.8$ mag) metal-poor M4V star only $12.162\pm0.005$ pc away from the Solar System with o…
View article: Gliese 12 b, a temperate Earth-sized planet at 12 parsecs discovered with <i>TESS</i> and <i>CHEOPS</i>
Gliese 12 b, a temperate Earth-sized planet at 12 parsecs discovered with <i>TESS</i> and <i>CHEOPS</i> Open
We report on the discovery of Gliese 12 b, the nearest transiting temperate, Earth-sized planet found to date. Gliese 12 is a bright (V = 12.6 mag, K = 7.8 mag) metal-poor M4V star only 12.162 ± 0.005 pc away from the Solar system with one…