Publications (66)
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…
A Jupiter-like Planet Orbiting the Nearby M Dwarf GJ832
Jeremy Bailey, R. Paul Butler, C. G. Tinney +4
Precision Doppler velocity measurements from the Anglo-Australian Tele- scope reveal a planet with a 9.4+/-0.4 year period orbiting the M1.5 dwarf GJ 832. Within measurement uncert…
New Planets around Three G Dwarfs
Simon J. O'Toole, R. Paul Butler, C. G. Tinney +8
Doppler velocity measurements from the Anglo-Australian Planet Search reveal planetary mass companions to HD23127, HD159868, and a possible second planetary companion to HD154857.…
The Distribution of Carbon Monoxide in the Lower Atmosphere of Venus
Daniel V. Cotton, Jeremy Bailey, D. Crisp +1
We have obtained spatially resolved near-infrared spectroscopy of the Venus nightside on 15 nights over three observing seasons. We use the depth of the CO absorption band at 2.3 m…
A Large Ground-Based Observing Campaign of the Disintegrating Planet K2-22b
Knicole D. Colón, George Zhou, Avi Shporer +27
We present 45 ground-based photometric observations of the K2-22 system collected between December 2016 and May 2017, which we use to investigate the evolution of the transit of th…
The intrinsic and interstellar broadband linear polarization of nearby FGK dwarfs
Daniel V. Cotton, Jonathan P. Marshall, Jeremy Bailey +4
We present linear polarization measurements of nearby FGK dwarfs to parts-per-million (ppm) precision. Before making any allowance for interstellar polarization, we found that the…
The linear polarisation of southern bright stars measured at the parts-per-million level
Daniel V. Cotton, Jeremy Bailey, Lucyna Kedziora-Chudczer +4
We report observations of the linear polarisation of a sample of 50 nearby southern bright stars measured to a median sensitivity of 4.4 . We find larger pola…
Examining the broadband emission spectrum of WASP-19b: A new z band eclipse detection
George Zhou, Lucyna Kedziora-Chudczer, Daniel D. R. Bayliss +1
WASP-19b is one of the most irradiated hot-Jupiters known. Its secondary eclipse is the deepest of all transiting planets, and has been measured in multiple optical and infrared ba…
A study of the rapid rotator Aql: differential surface rotation?
Ian D. Howarth, Jeremy Bailey, Daniel V. Cotton +1
We report new, extremely precise, photopolarimetry of the rapidly-rotating A0 main-sequence star Aql, covering the wavelength range 400--900nm, which reveals a rotationa…
Revised Architecture and Two New Super-Earths in the HD 134606 Planetary System
Zhexing Li, Stephen R. Kane, Timothy D. Brandt +15
Multi-planet systems exhibit a diversity of architectures that diverge from the solar system and contribute to the topic of exoplanet demographics. Radial velocity (RV) surveys for…
Epsilon Sagittarii: An Extreme Rapid Rotator with a Decretion Disk
Jeremy Bailey, Fiona Lewis, Ian D. Howarth +3
We report high-precision multi-wavelength linear-polarization observations of the bright B9 (or A0) star Sagittarii. The polarization shows the distinctive wavelength dependen…
The rotation of alpha Oph investigated using polarimetry
Jeremy Bailey, Daniel V. Cotton, Ian D. Howarth +2
Recently we have demonstrated that high-precision polarization observations can detect the polarization resulting from the rotational distortion of a rapidly rotating B-type star.…
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-…
The polarization of the binary system Spica, and the reflection of light from stars
Jeremy Bailey, Daniel. V. Cotton, Lucyna Kedziora-Chudczer +2
Close binary systems often show linear polarization varying over the binary period, usually attributed to light scattered from electrons in circumstellar clouds. One of the brighte…
VSTAR Modelling of the Infrared Spectrum of Uranus
Kimberly Bott, Lucyna Kedziora-Chudczer, Jeremy Bailey
We modelled the H-band spectrum obtained with the Infrared Imaging Spectrograph (IRIS2) at the Anglo-Australian Telescope in order to infer the cloud structure and composition of t…
Mariner 2 and its Legacy: 50 Years on
Jeremy Bailey
Fifty years ago, NASA's Jet Propulsion Laboratory (JPL) built and flew the first successful spacecraft to another planet: Mariner 2 to Venus. This paper discusses the context of th…
High eccentricity planets from the Anglo-Australian Planet Search
Hugh R. A. Jones, R. Paul Butler, C. G. Tinney +5
We report Doppler measurements of the stars HD187085 and HD20782 which indicate two high eccentricity low-mass companions to the stars. We find HD187085 has a Jupiter-mass companio…
A study of the F-giant star Scorpii A: a post-merger rapid rotator?
Fiona Lewis, Jeremy Bailey, Daniel V. Cotton +3
We report high-precision observations of the linear polarization of the F1III star Scorpii. The polarization has a wavelength dependence of the form expected for a rapid r…
Empirical line lists and absorption cross sections for methane at high temperature
Robert J. Hargreaves, Peter F. Bernath, Jeremy Bailey +1
Hot methane is found in many "cool" sub-stellar astronomical sources including brown dwarfs and exoplanets, as well as in combustion environments on Earth. We report on the first h…
Modelling the near-IR spectra of Jupiter using line-by-line methods
Lucyna Kedziora-Chudczer, Jeremy Bailey
We have obtained long-slit, infrared spectra of Jupiter with the Anglo Australian Telescope in the K and H bands at a resolving power of 2260. Using a line-by-line, radiative trans…
Multi-wavelength aperture polarimetry of debris disc host stars
Jonathan P. Marshall, Daniel V. Cotton, Kimberly Bott +3
Debris discs around main sequence stars have been extensively characterised from infrared to millimetre wavelengths through imaging, spectroscopic, and total intensity (scattered l…
A long-period planet orbiting a nearby Sun-like star
Hugh R. A. Jones, R. Paul Butler, C. G. Tinney +10
The Doppler wobble induced by the extra-solar planet HD 134987b was first detected by data from the Keck Telescope nearly a decade ago, and was subsequently confirmed by data from…
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…
Evidence for Reflected Light from the Most Eccentric Exoplanet Known
Stephen R. Kane, Robert A. Wittenmyer, Natalie R. Hinkel +16
Planets in highly eccentric orbits form a class of objects not seen within our Solar System. The most extreme case known amongst these objects is the planet orbiting HD~20782, with…
The Near-IR Spectrum of Titan Modeled with an Improved Methane Line List
Jeremy Bailey, Linda Ahlsved, V. S. Meadows
We have obtained spatially resolved spectra of Titan in the near-infrared J, H and K bands at a resolving power of ~5000 using the near-infrared integral field spectrometer (NIFS)…
Polarization of hot Jupiter systems: a likely detection of stellar activity and a possible detection of planetary polarization
Jeremy Bailey, Kimberly Bott, Daniel V. Cotton +6
We present high-precision linear polarization observations of four bright hot Jupiter systems ( Boo, HD 179949, HD 189733 and 51 Peg) and use the data to search for polarized r…
A Comparison of Water Vapor Line Parameters for Modeling the Venus Deep Atmosphere
Jeremy Bailey
The discovery of the near infrared windows into the Venus deep atmosphere has enabled the use of remote sensing techniques to study the composition of the Venus atmosphere below th…
Deneb is a Large Amplitude Polarimetric Variable
Daniel V. Cotton, Jeremy Bailey, Jean Perkins +2
We write to report the discovery that Deneb is a large amplitude polarization variable. Over a ~400 d time span from August 2022 Deneb's polarization was typically around 3900 part…
An investigation of lucky imaging techniques
Andrew Smith, Jeremy Bailey, J. H. Hough +1
We present an empirical analysis of the effectiveness of frame selection (also known as Lucky Imaging) techniques for high resolution imaging. A high-speed image recording system h…
MagAO Imaging of Long-period Objects (MILO). II. A Puzzling White Dwarf around the Sun-like Star HD 11112
Timothy J. Rodigas, P. Bergeron, Amelie Simon +18
HD 11112 is an old, Sun-like star that has a long-term radial velocity (RV) trend indicative of a massive companion on a wide orbit. Here we present direct images of the source res…
The polarisation of HD 189733
Kimberly Bott, Jeremy Bailey, Lucyna Kedziora-Chudczer +4
We present linear polarization observations of the exoplanet system HD 189733 made with the HIgh Precision Polarimetric Instrument (HIPPI) on the Anglo-Australian Telescope (AAT).…
Polarimetric and radiative transfer modelling of HD 172555
Jonathan P. Marshall, Daniel V. Cotton, Peter Scicluna +3
The debris disc around HD 172555 was recently imaged in near-infrared polarised scattered light by the Very Large Telescope's Spectro-Polarimetric High-contrast Exoplanet REsearch…
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…
Extended High Circular Polarization in the Orion Massive Star Forming Region: Implications for the Origin of Homochirality in the Solar System
Tsubasa Fukue, Motohide Tamura, Ryo Kandori +7
We present a wide-field (~6'x6') and deep near-infrared (Ks band: 2.14 micro m) circular polarization image in the Orion nebula, where massive stars and many low-mass stars are for…
A Super-Earth and two Neptunes Orbiting the Nearby Sun-like star 61 Virginis
Steven S. Vogt, Robert A. Wittenmyer, R. Paul Butler +10
We present precision radial velocity (RV) data that reveal a multiple exoplanet system orbiting the bright nearby G5V star 61 Virginis. Our 4.6 years of combined Keck/HIRES and Ang…
A high precision polarimeter for small telescopes
Jeremy Bailey, Daniel V. Cotton, Lucyna Kedziora-Chudczer
We describe Mini-HIPPI (Miniature HIgh Precision Polarimetric Instrument), a stellar polarimeter weighing just 650 grams but capable of measuring linear polarization to $\sim10^{-5…
Carrying a Torch for Dust in Binary Star Systems
Daniel V. Cotton, Jonathan P. Marshall, Kimberly Bott +2
Young stars are frequently observed to host circumstellar disks, within which their attendant planetary systems are formed. Scattered light imaging of these proto-planetary disks r…
Doppler Constraints on Planetary Companions to Nearby Sun-like Stars: An Archival Radial Velocity Survey of Southern Targets for Proposed NASA Direct Imaging Missions
Katherine Laliotis, Jennifer A. Burt, Eric E. Mamajek +22
Directly imaging temperate rocky planets orbiting nearby, Sun-like stars with a 6-m-class IR/O/UV space telescope, recently dubbed the Habitable Worlds Observatory, is a high prior…
The Dawes Review 3: The Atmospheres of Extrasolar Planets and Brown Dwarfs
Jeremy Bailey
The last few years has seen a dramatic increase in the number of exoplanets known and in the range of methods for characterising their atmospheric properties. At the same time, new…
A high-sensitivity polarimeter using a ferro-electric liquid crystal modulator
Jeremy Bailey, Lucyna Kedziora-Chudczer, Daniel V. Cotton +3
We describe the HIgh Precision Polarimetric Instrument (HIPPI), a polarimeter built at UNSW Australia and used on the Anglo-Australian Telescope (AAT). HIPPI is an aperture polarim…
One Hundred Years of Venus Polarimetry: PICSARR Observations of the Phase Curves
Jeremy Bailey, Daniel V. Cotton, Kimberly Bott +1
We report new high-precision observations of the polarization of light scattered from the atmosphere of Venus, made 100 years after the pioneering studies by Bernard Lyot. The new…
Atmospheric Modelling for Neptune's Methane D/H Ratio - Preliminary Results
Daniel V. Cotton, Lucyna L. Kedziora-Chudczer, Kimberly Bott +1
The ratio of deuterium to hydrogen (D/H ratio) of Solar System bodies is an important clue to their formation histories. Here we fit a Neptunian atmospheric model to Gemini Near In…
The linear polarization of nearby bright stars measured at the parts per million level
Jeremy Bailey, P. W. Lucas, J. H. Hough
We report observations of the linear polarization of a sample of 49 nearby bright stars measured to sensitivities of between ~1 and 4 x 10^-6. The majority of stars in the sample s…
The Rotationally Modulated Polarization of Boo A
Daniel V. Cotton, Dag Evensberget, Stephen C. Marsden +9
We have observed the active star Boo A (HD 131156A) with high precision broadband linear polarimetry contemporaneously with circular spectropolarimetry. We find both signals a…
The spectrum of hot methane in astronomical objects using a comprehensive computed line list
Sergei N. Yurchenko, Jonathan Tennyson, Jeremy Bailey +2
Hot methane spectra are important in environments ranging from flames to the atmospheres of cool stars and exoplanets. A new spectroscopic line list, 10to10, for CH cont…
Polarization position angle standard stars: a reassessment of and its variability for seventeen stars based on a decade of observations
Daniel V. Cotton, Jeremy Bailey, Lucyna Kedziora-Chudczer +14
Observations of polarization position angle () standards made from 2014 to 2023 with the High Precision Polarimetric Instrument (HIPPI) and other HIPPI-class polarimeters in bo…
UV circular polarisation in star formation regions: the origin of homochirality?
P. W. Lucas, J. H. Hough, Jeremy Bailey +3
Ultraviolet circularly polarised light has been suggested as the initial cause of the homochirality of organic molecules in terrestrial organisms, via enantiomeric selection of pre…
Rapid polarization variations in the O4 supergiant Puppis
Jeremy Bailey, Ian D. Howarth, Daniel V. Cotton +5
We present time-series linear-polarization observations of the bright O4 supergiant Puppis. The star is found to show polarization variation on timescales of around an hour an…
Polarimetric detection of nonradial oscillation modes in the beta Cephei star beta Crucis
Daniel V. Cotton, Derek L. Buzasi, Conny Aerts +11
Here we report the detection of polarization variations due to nonradial modes in the beta Cephei star beta Crucis. In so doing we confirm 40-year-old predictions of pulsation-indu…
Neural Networks and the Classification of Active Galactic Nucleus Spectra
Daya M. Rawson, Jeremy Bailey, Paul J. Francis
The use of Artificial Neural Networks (ANNs) as a classifier of digital spectra is investigated. Using both simulated and real data, it is shown that neural networks can be trained…
Atmospheric Modelling for the Removal of Telluric Features from Infrared Planetary Spectra
Daniel V. Cotton, Jeremy Bailey, Lucyna Kedziora-Chudczer
The effects of telluric absorption on infrared spectra present a problem for the observer. Strong molecular absorptions from species whose concentrations vary with time can be part…
Colour-colour and colour-magnitude diagrams for Hot Jupiters
Graeme Melville, Lucyna Kedziora-Chudczer, Jeremy Bailey
We use ground-based and space-based eclipse measurements for the near-infrared () bands and Spitzer 3.6 m and 4.5 m bands to construct colour-colour and colour-magn…
A Neptune-mass Planet Orbiting the Nearby G Dwarf HD16417
Simon O'Toole, C. G. Tinney, R. Paul Butler +6
Precision Doppler measurements from an intensive 48 night "Rocky Planet Search" observing campaign on the Anglo-Australian Telescope (AAT) have revealed the presence of a low-mass…
Phase-locked polarization by photospheric reflection in the semidetached eclipsing binary Sco
Daniel V. Cotton, Jeremy Bailey, Lucyna Kedziora-Chudczer +1
We report the detection of phase-locked polarization in the bright (=2.98-3.24) semidetached eclipsing binary Sco (HD 151890). The phenomenon was observed in multiple p…
Polarized Radiative Transfer in Planetary Atmospheres and the Polarization of Exoplanets
Jeremy Bailey, Lucyna Kedziora-Chudczer, Kimberly Bott
We describe the incorporation of polarized radiative transfer into the atmospheric radiative transfer modelling code VSTAR (Versatile Software for Transfer of Atmospheric Radiation…
PICSARR: high-precision polarimetry using CMOS image sensors
Jeremy Bailey, Daniel V. Cotton, Ain De Horta +2
We have built and tested a compact, low-cost, but very-high-performance astronomical polarimeter based on a continuously rotating half-wave plate and a high-speed imaging detector.…
RVTESS I: Modeling Asteroseismic Signals with Simultaneous Photometry and RVs
Jiaxin Tang, Sharon X. Wang, Yaguang Li +22
Detecting small planets via the radial velocity method remains challenged by signals induced by stellar variability, versus the effects of the planet(s). Here, we explore using Gau…
A spectro-astrometric study of southern pre-main sequence stars - binaries, outflows, and disc structure down to AU scales
Michihiro Takami, Jeremy Bailey, Antonio Chrysostomou
We present spectro-astrometric observations for 28 southern pre-main sequence (PMS) stars and investigate their circumstellar environment down to AU scales. The structures detected…
Modelling the Spectra of Planets, Brown Dwarfs and Stars using VSTAR
Jeremy Bailey, Lucyna Kedziora-Chudczer
We describe a new software package capable of predicting the spectra of solar-system planets, exoplanets, brown dwarfs and cool stars. The Versatile Software for Transfer of Atmosp…
The wavelength dependence of interstellar polarization in the Local Hot Bubble
Daniel V. Cotton, Jonathan P. Marshall, Priscilla C. Frisch +6
The properties of dust in the interstellar medium (ISM) nearest the Sun are poorly understood because the low column densities of dust toward nearby stars induce little photometric…
Polarization due to rotational distortion in the bright star Regulus
Daniel V. Cotton, Jeremy Bailey, Ian D. Howarth +4
Polarization in stars was first predicted by Chandrasekhar [1] who calculated a substantial linear polarization at the stellar limb for a pure electron-scattering atmosphere. This…
HIPPI-2: A Versatile High Precision Polarimeter
Jeremy Bailey, Daniel V. Cotton, Lucyna Kedziora-Chudczer +2
We describe the High-Precision Polarimetric Instrument-2 (HIPPI-2) a highly versatile stellar polarimeter developed at the University of New South Wales (UNSW). Two copies of HIPPI…
A Bright Short Period M-M Eclipsing Binary from the KELT Survey: Magnetic Activity and the Mass-Radius Relationship for M-dwarfs
Jack B. Lubin, Joseph E. Rodriguez, George Zhou +26
We report the discovery of KELT J041621-620046, a moderately bright (J10.2) M dwarf eclipsing binary system at a distance of 393 pc. KELT J041621-620046 was first identi…
Signals embedded in the radial velocity noise. Periodic variations in the tau Ceti velocities
Mikko Tuomi, Hugh R. A. Jones, James S. Jenkins +12
The abilities of radial velocity exoplanet surveys to detect the lowest-mass extra-solar planets are currently limited by a combination of instrument precision, lack of data, and "…
Polarization measurements of the polluted white dwarf G29-38
Daniel V. Cotton, Jeremy Bailey, J. E. Pringle +3
We have made high precision polarimetric observations of the polluted white dwarf G29-38 with the HIgh Precision Polarimetric Instrument 2. The observations were made at two differ…
The polarization of the planet-hosting WASP-18 system
Kimberly Bott, Jeremy Bailey, Daniel V. Cotton +3
We report observations of the linear polarization of the WASP-18 system, which harbors a very massive ( approx 10 M_J) planet orbiting very close to its star with an orbital period…