Publications (140)
The TESS Grand Unified Hot Jupiter Survey. I. Ten TESS Planets
Samuel W. Yee, Joshua N. Winn, Joel D. Hartman +69
We report the discovery of ten short-period giant planets (TOI-2193A b, TOI-2207 b, TOI-2236 b, TOI-2421 b, TOI-2567 b, TOI-2570 b, TOI-3331 b, TOI-3540A b, TOI-3693 b, TOI-4137 b)…
Transits of Known Planets Orbiting a Naked-Eye Star
Stephen R. Kane, Selçuk Yalçınkaya, Hugh P. Osborn +45
Some of the most scientifically valuable transiting planets are those that were already known from radial velocity (RV) surveys. This is primarily because their orbits are well cha…
GJ 832c: A super-earth in the habitable zone
R. A. Wittenmyer, Mikko Tuomi, R. P. Butler +17
We report the detection of GJ 832c, a super-Earth orbiting near the inner edge of the habitable zone of GJ 832, an M dwarf previously known to host a Jupiter analog in a nearly-cir…
Capturing Trojans and Irregular Satellites - the key required to unlock planetary migration
Jonathan Horner, F. Elliott Koch, Patryk Sofia Lykawka
It is now accepted that the Solar system's youth was a dynamic and chaotic time. The giant planets migrated significant distances to reach their current locations, and evidence of…
TOI-431/HIP 26013: a super-Earth and a sub-Neptune transiting a bright, early K dwarf, with a third RV planet
Ares Osborn, David J. Armstrong, Bryson Cale +125
We present the bright (V), multi-planet system TOI-431, characterised with photometry and radial velocities. We estimate the stellar rotation period to be $30.5 \pm…
The Search for the Inbetweeners: How packed are TESS planetary systems?
Jonathan Horner, Robert A. Wittenmyer, Stephen R. Kane +1
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 pl…
The GALAH Survey: Chemodynamics of the Solar Neighbourhood
Michael R. Hayden, Joss Bland-Hawthorn, Sanjib Sharma +13
We present the chemodynamic structure of the solar neighbourhood using 62 814 stars within a 500 pc sphere of the Sun observed by GALAH and with astrometric parameters from Gaia DR…
TOI-257b (HD 19916b): A Warm sub-Saturn Orbiting an Evolved F-type Star
Brett C. Addison, Duncan J. Wright, Belinda A. Nicholson +91
We report the discovery of a warm sub-Saturn, TOI-257b (HD 19916b), based on data from NASA's Transiting Exoplanet Survey Satellite (TESS). The transit signal was detected by TESS…
HD 83443c: A highly eccentric giant planet on a 22-year orbit
Adriana Errico, Robert A. Wittenmyer, Jonathan Horner +19
We report the discovery of a highly eccentric long-period Jovian planet orbiting the hot-Jupiter host HD\,83443. By combining radial velocity data from four instruments (AAT/UCLES,…
An Orbital Stability Study of the Proposed Companions of SW Lyncis
Tobias C. Hinse, Jonathan Horner, Robert A. Wittenmyer
We have investigated the dynamical stability of the proposed companions orbiting the Algol type short-period eclipsing binary SW Lyncis (Kim et al. 2010). The two candidate compani…
TOI-1994b: A Low Mass Eccentric Brown Dwarf Transiting A Subgiant Star
Emma Page, Joshua Pepper, Duncan Wright +22
We present the discovery of TOI-1994b, a low-mass brown dwarf transiting a hot subgiant star on a moderately eccentric orbit. TOI-1994 has an effective temperature of $7700^{+720}_…
A sub-Neptune transiting the young field star HD 18599 at 40 pc
Jerome P. de Leon, John H. Livingston, James S. Jenkins +67
Transiting exoplanets orbiting young nearby stars are ideal laboratories for testing theories of planet formation and evolution. However, to date only a handful of stars with age <…
The Pan-Pacific Planet Search. IV. Two super-Jupiters in a 3:5 resonance orbiting the giant star HD33844
Robert A. Wittenmyer, John Asher Johnson, R. P. Butler +9
We report the discovery of two giant planets orbiting the K giant HD 33844 based on radial velocity data from three independent campaigns. The planets move on nearly circular orbit…
The GALAH survey: Chemical Tagging of Star Clusters and New Members in the Pleiades
Janez Kos, Joss Bland-Hawthorn, Ken Freeman +25
The technique of chemical tagging uses the elemental abundances of stellar atmospheres to `reconstruct' chemically homogeneous star clusters that have long since dispersed. The GAL…
The K2-HERMES Survey. I. Planet Candidate Properties from K2 Campaigns 1-3
Robert A. Wittenmyer, Sanjib Sharma, Dennis Stello +31
Accurate and precise radius estimates of transiting exoplanets are critical for understanding their compositions and formation mechanisms. To know the planet, we must know the host…
Revised Exoplanet Radii and Habitability Using Gaia Data Release 2
Daniel Johns, Connor Marti, Madison Huff +4
Accurate stellar properties are crucial for determining exoplanet characteristics. Gaia DR2 presents revised distances, luminosities, and radii for 1.6 billion stars. Here, we repo…
The Curious Case of HU Aquarii - Dynamically Testing Proposed Planetary Systems
Jonathan Horner, Robert A Wittenmyer, Jonathan P Marshall +2
In early 2011, the discovery of two planets moving on surprisingly extreme orbits around the eclipsing polar cataclysmic variable system HU Aquraii was announced based on variation…
Predicting multiple planet stability and habitable zone companions in the TESS era
Matthew T. Agnew, Sarah T. Maddison, Jonathan Horner +1
We present an approach that is able to both rapidly assess the dynamical stability of multiple planet systems, and determine whether an exoplanet system would be capable of hosting…
TOI-3362b: A Proto-Hot Jupiter Undergoing High-Eccentricity Tidal Migration
Jiayin Dong, Chelsea X. Huang, George Zhou +39
High-eccentricity tidal migration is a possible way for giant planets to be emplaced in short-period orbits. If it commonly operates, one would expect to catch proto-Hot Jupiters o…
Initial Characterization of Active Transitioning Centaur, P/2019 LD2 (ATLAS), using Hubble, Spitzer, ZTF, Keck, APO and GROWTH Visible & Infrared Imaging and Spectroscopy
Bryce T. Bolin, Yanga R. Fernandez, Carey M. Lisse +43
We present visible and mid-infrared imagery and photometry of temporary Jovian co-orbital comet P/2019 LD taken with HST/WFC3, Spitzer/IRAC, the GROWTH telescope network, visib…
A pair of Jovian Trojans at the L4 Lagrange point
Timothy R. Holt, David Vokrouhlický, David Nesvorný +2
Asteroid pairs, two objects that are not gravitationally bound to one another, but share a common origin, have been discovered in the Main belt and Hungaria populations. Such pairs…
TESS Delivers Five New Hot Giant Planets Orbiting Bright Stars from the Full Frame Images
Joseph E. Rodriguez, Samuel N. Quinn, George Zhou +115
We present the discovery and characterization of five hot and warm Jupiters -- TOI-628 b (TIC 281408474; HD 288842), TOI-640 b (TIC 147977348), TOI-1333 b (TIC 395171208, BD+47 352…
The Dependence of Earth Milankovitch Cycles on Martian Mass
Stephen R. Kane, Pam Vervoort, Jonathan Horner
The Milankovitch cycles of Earth result from gravitational interactions with other bodies in the Solar System. These interactions lead to slow changes in the orbit and angular mome…
Near-resonance in a system of sub-Neptunes from TESS
Samuel N. Quinn, Juliette C. Becker, Joseph E. Rodriguez +78
We report the Transiting Exoplanet Survey Satellite () detection of a multi-planet system orbiting the K0 dwarf TOI 125. We find evidence for up to five planets, wit…
The Pan-Pacific Planet Search. II. Confirmation of a two-planet system around HD 121056
Robert A. Wittenmyer, Liang Wang, Fan Liu +5
Precise radial velocities from the Anglo-Australian Telescope confirm the presence of a rare short-period planet around the K0 giant HD 121056. An independent two-planet solution u…
Two mini-Neptunes Transiting the Adolescent K-star HIP 113103 Confirmed with TESS and CHEOPS
Nataliea Lowson, George Zhou, Chelsea X. Huang +31
We report the discovery of two mini-Neptunes in near 2:1 resonance orbits ( d for HIP 113103 b and d for HIP 113103 c) around the adolescent K-star HIP 11…
On the RZ Draconis Sub-stellar Circumbinary Companions Stability Study of the Proposed Sub-stellar Circumbinary System
Tobias C. Hinse, Jonathan Horner, Jae Woo Lee +3
In this work we revisit the proposed multi-circumbinary system RZ Dra. We find the proposed system to be highly unstable. We attempt to find a best-fit light-travel time model rend…
Forever alone? Testing single eccentric planetary systems for multiple companions
Robert A. Wittenmyer, Songhu Wang, Jonathan Horner +9
Determining the orbital eccentricity of an extrasolar planet is critically important for understanding the system's dynamical environment and history. However, eccentricity is ofte…
System Architecture and Planetary Obliquity: Implications for Long-Term Habitability
Pam Vervoort, Jonathan Horner, Stephen R. Kane +2
In the search for life beyond our Solar system, attention should be focused on those planets that have the potential to maintain habitable conditions over the prolonged periods of…
The GALAH survey: A census of lithium-rich giant stars
Sarah Martell, Jeffrey Simpson, Adithya Balasubramaniam +20
We investigate the properties of 1262 red giant stars with high photospheric abundances of lithium observed by the GALAH and \Ktwo-HERMES surveys, and discuss them in the context o…
TOI-1431b/MASCARA-5b: A Highly Irradiated Ultra-Hot Jupiter Orbiting One of the Hottest & Brightest Known Exoplanet Host Stars
Brett Christopher Addison, Emil Knudstrup, Ian Wong +70
We present the discovery of a highly irradiated and moderately inflated ultra-hot Jupiter, TOI-1431b/MASCARA-5b (HD 201033b), first detected by NASA's Transiting Exoplanet Survey S…
The Dynamics of Centaurs in the Vicinity of the 2:1 Mean Motion Resonance of Neptune and Uranus Trojan Region
Jeremy Wood, Jonathan Horner
In this work we present the results of a suite of dynamical simulations following the orbital evolution of 8,022 hypothetical Centaur objects. These Centaurs begin our integrations…
The GALAH survey: a catalogue of carbon-enhanced stars and CEMP candidates
Klemen Äotar, Tomaž Zwitter, Janez Kos +19
Swan bands - characteristic molecular absorption features of the C molecule - are a spectroscopic signature of carbon-enhanced stars. They can also be used to identify carbon-e…
Astrocladistics of the Jovian Trojan Swarms
Timothy R. Holt, Jonathan Horner, David Nesvorný +4
The Jovian Trojans are two swarms of small objects that share Jupiter's orbit, clustered around the leading and trailing Lagrange points, L and L. In this work, we investig…
Could life have been transferred from Mars to Earth? Laboratory and computational simulations of Martian ejecta
Gregory M. Davis, Jonathan Horner, Bradley D. Carter +1
The study of the origin of life on Earth has been broadened due to panspermia models that suggest that early life may have been transferred between planets. Mars likely once had co…
The Mysterious Dimmings of the T Tauri Star V1334 Tau
Joseph E. Rodriguez, George Zhou, Phillip A. Cargile +35
We present the discovery of two extended 0.12 mag dimming events of the weak-lined T-Tauri star V1334. The start of the first event was missed but came to an end in late 2003…
HD 38973 b -- a cold Saturn orbiting a Sun-like star
Adriana Errico, Robert A. Wittenmyer, Jonathan Horner +2
We report the detection of a long-period companion to the nearby solar-type star HD\,38973 using precision radial-velocity measurements. The radial-velocity data reveal a coherent…
Could the Migration of Jupiter have Accelerated the Atmospheric Evolution of Venus?
Stephen R. Kane, Pam Vervoort, Jonathan Horner +1
In the study of planetary habitability and terrestrial atmospheric evolution, the divergence of surface conditions for Venus and Earth remains an area of active research. Among the…
The GALAH survey: Co-orbiting stars and chemical tagging
Jeffrey D. Simpson, Sarah L. Martell, Gary Da Costa +24
We present a study using the second data release of the GALAH survey of stellar parameters and elemental abundances of 15 pairs of stars identified by Oh et al 2017. They identifie…
Observations of the D/H ratio in Methane in the atmosphere of Saturn's moon, Titan - where did the Saturnian system form?
Lucyna Kedziora-Chudczer, Jeremy Bailey, Jonathan Horner
The details of the Solar system's formation are still heavily debated. Questions remain about the formation locations of the giant planets, and the degree to which volatile materia…
Kuiper Belt Formation via Grainy Planetary Migration
Patryk Sofia Lykawka, Jonathan Horner, Pedro Bernardinelli
We used N-body simulations to model the 4.5 Gyr orbital evolution of the early Kuiper Belt, incorporating a massive protoplanetary disk, the four giant planets, and 1500 primordial…
The dynamical evolution of dwarf planet (136108) Haumea's collisional family: General properties and implications for the trans-Neptunian belt
Patryk Sofia Lykawka, Jonathan Horner, Tadashi Mukai +1
Recently, the first collisional family was identified in the trans-Neptunian belt. The family consists of Haumea and at least ten other ~100km-sized trans-Neptunian objects (TNOs)…
Finding Alien Worlds in Queensland -- A Decade of MINERVA-Australis
Jonathan Horner, Robert A. Wittenmyer, Stephen R. Kane +2
Three decades ago, humanity entered the Exoplanet Era, with the discovery of the first planets orbiting other stars. Today, more than 6000 exoplanets are known - a tally recently b…
KELT-25b and KELT-26b: A Hot Jupiter and a Substellar Companion Transiting Young A-stars Observed by TESS
Romy RodrÃguez MartÃnez, B. Scott Gaudi, Joseph E. Rodriguez +89
We present the discoveries of KELT-25b (TIC 65412605, TOI-626.01) and KELT-26b (TIC 160708862, TOI-1337.01), two transiting companions orbiting relatively bright, early A-stars. Th…
Hot Jupiter - Cold Jupiter: A complex sibling relation
Adriana Errico, Robert A. Wittenmyer, Jonathan Horner +2
A handful of planetary systems hosting a Hot Jupiter have been subsequently found to also host long-period giant planets. These ``cold Jupiters,'' giant planets residing beyond the…
The Spin-orbit alignment of two short period eclipsing binary systems
Tony Wells, B. C. Addison, R. A. Wittenmyer +8
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 a…
The GALAH Survey: Verifying abundance trends in the open cluster M67 using non-LTE spectroscopy
Xudong Gao, Karin Lind, Anish M. Amarsi +28
Open cluster members are coeval and share the same initial bulk chemical compositions. Consequently, differences in surface abundances between members of a cluster that are at diff…
The GALAH+ Survey: Third Data Release
Sven Buder, Sanjib Sharma, Janez Kos +44
The ensemble of chemical element abundance measurements for stars, along with precision distances and orbit properties, provides high-dimensional data to study the evolution of the…
Stability of Jovian Trojans and their collisional families
Timothy R. Holt, David Nesvorny, Jonathan Horner +6
The Jovian Trojans are two swarms of objects located around the L and L Lagrange points. The population is thought to have been captured by Jupiter during the Solar system'…
Detection of Planetary and Stellar Companions to Neighboring Stars via a Combination of Radial Velocity and Direct Imaging Techniques
Stephen R. Kane, Paul A. Dalba, Zhexing Li +13
The sensitivity of radial velocity (RV) surveys for exoplanet detection are extending to increasingly long orbital periods, where companions with periods of several years are now b…
The GALAH survey: unresolved triple Sun-like stars discovered by the Gaia mission
Klemen Äotar, Tomaž Zwitter, Gregor Traven +16
The latest Gaia data release enables us to accurately identify stars that are more luminous than would be expected on the basis of their spectral type and distance. During an inves…
The NEID Earth Twin Survey. II. Dynamical Masses in Seven High-acceleration Star Systems
Mark R. Giovinazzi, Cullen H. Blake, Paul Robertson +26
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 betw…
Cladistical analysis of the Jovian and Saturnian satellite systems
Timothy. R. Holt, Adrian. J. Brown, David Nesvorný +2
Jupiter and Saturn each have complex systems of satellites and rings. These satellites can be classified into dynamical groups, implying similar formation scenarios. Recently, a la…
TOI-481 b & TOI-892 b: Two long period hot Jupiters from the Transiting Exoplanet Survey Satellite
Rafael Brahm, Louise D. Nielsen, Robert A. Wittenmyer +75
We present the discovery of two new 10-day period giant planets from the Transiting Exoplanet Survey Satellite () mission, whose masses were precisely determined using a wide…
2001 QR - an update on Neptune's first unstable Trojan companion
Jonathan Horner, Patryk Sofia Lykawka
The Neptune Trojans are the most recent addition to the panoply of Solar system small body populations. The orbit of the first discovered member, 2001 QR, was investigated…
Truly eccentric. II. When can two circular planets mimic a single eccentric orbit?
Robert A. Wittenmyer, Christoph Bergmann, Jonathan Horner +2
When, in the course of searching for exoplanets, sparse sampling and noisy data make it necessary to disentangle possible solutions to the observations, one must consider the possi…
The Anglo-Australian Planet Search XXV: A Candidate Massive Saturn Analog Orbiting HD 30177
Robert A. Wittenmyer, Jonathan Horner, M. W. Mengel +8
We report the discovery of a second long-period giant planet orbiting HD 30177, a star previously known to host a massive Jupiter analog (HD 30177b: a=3.80.1 au, m sin $i=9.7\…
A planet within the debris disk around the pre-main-sequence star AU Microscopii
Peter Plavchan, Thomas Barclay, Jonathan Gagné +84
AU Microscopii (AU Mic) is the second closest pre main sequence star, at a distance of 9.79 parsecs and with an age of 22 million years. AU Mic possesses a relatively rare and spat…
Wobbling Ancient Binaries - Here Be Planets?
Jonathan Horner, Robert Wittenmyer, Tobias Hinse +2
In the last few years, a number of planets have been proposed to orbit several post main-sequence binary star systems on the basis of observed variations in the timing of eclipses…
The GALAH Survey: Stellar streams and how stellar velocity distributions vary with Galactic longitude, hemisphere and metallicity
Alice C. Quillen, Gayandhi De Silva, Sanjib Sharma +30
Using GALAH survey data of nearby stars, we look at how structure in the planar (u,v) velocity distribution depends on metallicity and on viewing direction within the Galaxy. In ne…
The GALAH Survey: A new constraint on cosmological lithium and Galactic lithium evolution from warm dwarf stars
Xudong Gao, Karin Lind, Anish M. Amarsi +22
Lithium depletion and enrichment in the cosmos is not yet well understood. To help tighten constraints on stellar and Galactic evolution models, we present the largest high-resolut…
Trials and Tribulations in the Reanalysis of KELT-24 b: a Case Study for the Importance of Stellar Modeling
Mark R. Giovinazzi, Bryson Cale, Jason D. Eastman +21
We present a new analysis of the KELT-24 system, comprising a well-aligned hot Jupiter, KELT-24~b, and a bright (), nearby () F-type host star. KELT-24~b…
The GALAH Survey: Chemical tagging and chrono-chemodynamics of accreted halo stars with GALAH+ DR3 and eDR3
Sven Buder, Karin Lind, Melissa K. Ness +27
Since the advent of astrometry, it is possible to identify massive accreted systems within the Galaxy through their unique dynamical signatures. One such system, -Saus…
The Great January Comet of 1910 (C/1910 A1): A Key Opportunity Missed by New Zealand Astronomers
John Drummond, Wayne Orchiston, Carolyn Brown +1
C/1910 A1 was one of the Great Comets of the twentieth century. Although it was widely observed from the Northern Hemisphere, it was first discovered by observers south of the Equa…
A dense mini-Neptune orbiting the bright young star HD 18599
Jose I. Vines, James S. Jenkins, Zaira Berdiñas +23
Very little is known about the young planet population because the detection of small planets orbiting young stars is obscured by the effects of stellar activity and fast rotation…
A Near-Earth Object Model Calibrated to Earth Impactors
Sophie E. Deam, Hadrien A. R. Devillepoix, David Nesvorný +16
The population of Earth-impacting meteoroids and its size-dependent orbital elements are key to understanding the origin of meteorites and informing on planetary defence efforts. O…
TOI-677 b: A Warm Jupiter (P=11.2d) on an eccentric orbit transiting a late F-type star
Andrés Jordán, Rafael Brahm, Néstor Espinoza +46
We report the discovery of TOI-677 b, first identified as a candidate in light curves obtained within Sectors 9 and 10 of the Transiting Exoplanet Survey Satellite (TESS) mission a…
The Anglo-Australian Planet Search XXIV: The Frequency of Jupiter Analogs
Robert A. Wittenmyer, R. P. Butler, C. G. Tinney +6
We present updated simulations of the detectability of Jupiter analogs by the 17-year Anglo-Australian Planet Search. The occurrence rate of Jupiter-like planets that have remained…
Origin and Dynamical Evolution of Neptune Trojans - II: Long Term Evolution
Patryk Sofia Lykawka, Jonathan Horner, Barrie W. Jones +1
We present results examining the fate of the Trojan clouds produced in our previous work. We find that the stability of Neptunian Trojans seems to be strongly correlated to their i…
Constraints from deuterium on the formation of icy bodies in the Jovian system and beyond
Jonathan Horner, Olivier Mousis, Yann Alibert +2
We consider the role of deuterium as a potential marker of location and ambient conditions during the formation of small bodies in our Solar system. We concentrate in particular on…
HD 183579b: A Warm Sub-Neptune Transiting a Solar Twin Detected by TESS
Tianjun Gan, Megan Bedell, Sharon Xuesong Wang +48
We report the discovery and characterization of a transiting warm sub-Neptune planet around the nearby bright ( mag, mag) solar twin HD 183579, delivered by the Tr…
The Pan-Pacific Planet Search -- IX. A menagerie of companions orbiting evolved stars
Robert A. Wittenmyer, Alexander Venner, Tyler Fairnington +22
We present resolutions as to the nature of six speculative candidate companions proposed in the final data release of the Pan-Pacific Planet Search, a 6-year radial-velocity survey…
Discovery of a Compact Companion to a Nearby Star
Stephen R. Kane, Paul A. Dalba, Jonathan Horner +5
Radial velocity (RV) searches for exoplanets have surveyed many of the nearest and brightest stars for long-term velocity variations indicative of a companion body. Such surveys of…
A Detailed Analysis of the HD 73526 2:1 Resonant Planetary System
Robert A. Wittenmyer, Xianyu Tan, Man Hoi Lee +15
We present six years of new radial-velocity data from the Anglo-Australian and Magellan Telescopes on the HD 73526 2:1 resonant planetary system. We investigate both Keplerian and…
Are Two of the Neptune Trojans Dynamically Unstable?
Jonathan Horner, Patryk Sofia Lykawka
The Neptune Trojans are the most recently discovered population of small bodies in the Solar System. To date, only eight have been discovered, though it is thought likely that the…
Spinning up a Daze: TESS Uncovers a Hot Jupiter orbiting the Rapid-Rotator TOI-778
Jake Clark, Brett Addison, Jack Okumura +68
NASA's Transiting Exoplanet Survey Satellite (TESS) mission, has been uncovering a growing number of exoplanets orbiting nearby, bright stars. Most exoplanets that have been discov…
A Dynamical Investigation of the Proposed BD +20 2457 System
Jonathan Horner, Robert A. Wittenmyer, Tobias C. Hinse +1
We present a detailed dynamical analysis of the orbital stability of the BD +20 2457 system, which features planets or brown dwarfs moving on relatively eccentric orbits. We find t…
Impact regimes and post-formation sequestration processes: implications for the origin of heavy noble gases in terrestrial planets
Olivier Mousis, Jonathan I. Lunine, Jean-Marc Petit +5
The difference between the measured atmospheric abundances of neon, argon, krypton and xenon for Venus, the Earth and Mars is striking. Because these abundances drop by at least tw…
Fundamental relations for the velocity dispersion of stars in the Milky Way
Sanjib Sharma, Michael R. Hayden, Joss Bland-Hawthorn +34
We explore the fundamental relations governing the radial and vertical velocity dispersions of stars in the Milky Way, from combined studies of complementary surveys including GALA…
The Gliese 86 Binary System: A Warm Jupiter Formed in a Disk Truncated at 2 AU
Yunlin Zeng, Timothy D. Brandt, Gongjie Li +12
Gliese 86 is a nearby K dwarf hosting a giant planet on a 16-day orbit and an outer white dwarf companion on a century-long orbit. In this study we combine radial…
The Pan-Pacific Planet Search. VIII. Complete results and the occurrence rate of planets around low-luminosity giants
Robert A. Wittenmyer, R. P. Butler, Jonathan Horner +6
Our knowledge of the populations and occurrence rates of planets orbiting evolved intermediate-mass stars lags behind that for solar-type stars by at least a decade. Some radial ve…
Minerva-Australis I: Design, Commissioning, & First Photometric Results
Brett Addison, Duncan J. Wright, Robert A. Wittenmyer +35
The Minerva-Australis telescope array is a facility dedicated to the follow-up, confirmation, characterisation, and mass measurement of bright transiting planets discovered by the…
Understanding Super-Earths with MINERVA-Australis at USQ's Mount Kent Observatory
Robert A Wittenmyer, Jonathan Horner, Brad D Carter +4
Super Earths, planets between 5-10 Earth masses, are the most common type of exoplanet known, yet are completely absent from our Solar system. As a result, their detailed propertie…
Planetary Trojans - the main source of short period comets?
Jonathan Horner, Patryk Sofia Lykawka
We present a short review of the impact regime experienced by the terrestrial planets within our own Solar system, describing the three populations of potentially hazardous objects…
Dynamical Constraints on Multi-Planet Exoplanetary Systems
Jonathan Horner, Robert A. Wittenmyer, Chris G. Tinney +3
As a direct result of ongoing efforts to detect more exoplanetary systems, an ever-increasing number of multiple-planet systems are being announced. But how many of these systems a…
A Mini-Neptune from TESS and CHEOPS Around the 120 Myr Old AB Dor member HIP 94235
George Zhou, Christopher P. Wirth, Chelsea X. Huang +36
The TESS mission has enabled discoveries of the brightest transiting planet systems around young stars. These systems are the benchmarks for testing theories of planetary evolution…
The Gender Balance of the Australian Space Research Community: A Snapshot From The 15th ASRC, 2015
Jonathan Horner, Alice Gorman, Ann Cairns +1
In recent years, the striking gender imbalance in the physical sciences has been a topic for much debate. National bodies and professional societies in the astronomical and space s…
TESS Spots a Compact System of Super-Earths around the Naked-Eye Star HR 858
Andrew Vanderburg, Chelsea X. Huang, Joseph E. Rodriguez +48
Transiting Exoplanet Survey Satellite (TESS) observations have revealed a compact multi-planet system around the sixth-magnitude star HR 858 (TIC 178155732, TOI 396), located 32 pa…
Truly eccentric. I. Revisiting eight single-eccentric planetary systems
Robert A. Wittenmyer, Jake T. Clark, Jinglin Zhao +3
We examine eight known single-eccentric planetary systems in light of recently released large data archives and new analysis techniques. For four of these systems (HD 7449, HD 6521…
A transiting warm giant planet around the young active star TOI-201
Melissa J. Hobson, Rafael Brahm, Andres Jordán +44
We present the confirmation of the eccentric warm giant planet TOI-201 b, first identified as a candidate in \textit{TESS} photometry (Sectors 1-8, 10-13, and 27-28) and confirmed…
Cool Jupiters greatly outnumber their toasty siblings: Occurrence rates from the Anglo-Australian Planet Search
Robert A. Wittenmyer, Songhu Wang, Jonathan Horner +8
Our understanding of planetary systems different to our own has grown dramatically in the past 30 years. However, our efforts to ascertain the degree to which the Solar system is a…
The role of Jupiter in driving Earth's orbital evolution
Jonathan Horner, Dave Waltham, F. Elliot Koch
In coming years, the first truly Earth-like planets will be discovered orbiting other stars, and the search for signs of life on these worlds will begin. However, such observations…
A Full Implementation of Spectro-Perfectionism for Precise Radial Velocity Exoplanet Detection: A Test Case With the MINERVA Reduction Pipeline
Matthew A. Cornachione, Adam S. Bolton, Jason D. Eastman +10
We present a computationally tractable implementation of spectro-perfectionism, a method which minimizes error imparted by spectral extraction. We develop our method in conjunction…
The GALAH Survey and Gaia DR2: (Non)existence of five sparse high-latitude open clusters
Janez Kos, Gayandhi de Silva, Joss Bland-Hawthorn +21
Sparse open clusters can be found at high galactic latitudes where loosely populated clusters are more easily detected against the lower stellar background. Because most star forma…
Main-sequence progenitor configurations of the NN Ser candidate circumbinary planetary system are dynamically unstable
Alexander J Mustill, Jonathan P Marshall, Eva Villaver +4
Recent observations of the NN Serpentis post-common envelope binary system have revealed eclipse timing variations that have been attributed to the presence of two Jovian-mass exop…
A Detailed Dynamical Investigation of the Proposed QS Virginis Planetary System
Jonathan Horner, Robert A Wittenmyer, Tobias C Hinse +3
In recent years, a number of planetary systems have been proposed to orbit evolved binary star systems. The presence of planets is invoked to explain observed variations in the tim…
Stable habitable zones of single Jovian planet systems
Matthew T. Agnew, Sarah T. Maddison, Elodie Thilliez +1
With continued improvement in telescope sensitivity and observational techniques, the search for rocky planets in stellar habitable zones is entering an exciting era. With so many…
On the dynamical stability of the proposed planetary system orbiting NSVS 14256825
Robert A. Wittenmyer, Jonathan Horner, Jonathan Marshall
We present a detailed dynamical analysis of the orbital stability of the two circumbinary planets recently proposed to orbit the evolved eclipsing binary star system NSVS 14256825.…
Resonances Required: Dynamical Analysis of the 24 Sex and HD 200964 Planetary Systems
Robert A. Wittenmyer, Jonathan Horner, C. G. Tinney
We perform several suites of highly detailed dynamical simulations to investigate the architectures of the 24 Sextantis and HD 200964 planetary systems. The best fit orbital soluti…
Two Earth-size Planets and an Earth-size Candidate Transiting the Nearby Star HD 101581
Michelle Kunimoto, Zifan Lin, Sarah Millholland +43
We report the validation of multiple planets transiting the nearby ( pc) K5V dwarf HD 101581 (GJ 435, TOI-6276, TIC 397362481). The system consists of at least two Earth-…