Search Publications
A catalogue of binary stars from phase modulation in the first four years of TESS mission photometry
Murphy, Simon J.; Huang, Chelsea X.; Wright, Duncan +2 more
We present a catalogue of binary companions to
Deep imaging of three accelerating stars using SHARK-NIR and LMIRCam at LBT
Ertel, S.; Barbato, D.; D'Orazi, V. +29 more
The combination of detection techniques enhances our ability to identify companions orbiting nearby stars. We employed high-contrast imaging to constrain mass and separation of possible companions responsible for the significant proper motion anomalies of the nearby stars HIP 11696, HIP 47110, and HIP 36277. These targets were observed using the L…
Gaia uncovers difference in B and Be star binarity at small scales: evidence for mass transfer causing the Be phenomenon
Oudmaijer, René D.; Vioque, Miguel; Dodd, Jonathan M. +2 more
Be stars make up almost 20 per cent of the B star population, and are rapidly rotating stars surrounded by a disc; however the origin of this rotation remains unclear. Mass transfer within close binaries provides the leading hypothesis, with previous detections of stripped companions to Be stars supporting this. Here, we exploit the exquisite astr…
Two mini-Neptunes transiting the adolescent K-star HIP 113103 confirmed with TESS and CHEOPS
Pallé, E.; Zhang, H.; Winn, J. N. +31 more
We report the discovery of two mini-Neptunes in near 2:1 resonance orbits (P = 7.610303 d for HIP 113103 b and P = 14.245651 d for HIP 113103 c) around the adolescent K-star HIP 113103 (TIC 121490076). The planet system was first identified from the TESS mission, and was confirmed via additional photometric and spectroscopic observations, includin…
HD 222237 b: a long-period super-Jupiter around a nearby star revealed by radial-velocity and Hipparcos-Gaia astrometry
Butler, R. Paul; Rice, Malena; Wittenmyer, Robert A. +16 more
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, we present the discovery of a super-Jupiter, HD 222237 b, orbiting a star located
HD 28185 revisited: an outer planet, instead of a brown dwarf, on a Saturn-like orbit
Vanderburg, Andrew; Wittenmyer, Robert A.; Huang, Chelsea X. +3 more
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
Orbits and masses in two triple systems
Tokovinin, Andrei; Nazor, Dinko
In an effort to determine accurate orbital and physical properties of a large number of bright stars, a method was developed to fit simultaneously stellar parameters (masses, luminosities, effective temperatures), distance, and orbits to the available data on multiple systems, namely the combined and differential photometry, positional measurement…
The Keck-HGCA Pilot Survey - II. Direct imaging discovery of HD 63754 B, a 20 au massive companion near the hydrogen burning limit
Jensen-Clem, Rebecca; Salama, Maïssa; Currie, Thayne +15 more
We present the joint astrometric and direct imaging discovery, mass measurement, and orbital analysis of HD 63754 B (HIP 38216 B), a companion near the stellar-substellar boundary orbiting
Discovery of double stars by Giovanni Battista Hodierna in 1654
Caballero, J. A.; González-Payo, J.
It has been generally accepted that the originators of the double star astronomy were Christian Mayer and William Herschel. We recovered the memory of the poorly known Italian astronomer Giovanni Battista Hodierna, who published the first catalogue of stellar binaries over a century before Mayer and Herschel. We analysed the fourth section of 1654…
Binarity and beyond in A stars - I. Survey description and first results of VLTI/GRAVITY observations of VAST targets with high Gaia-Hipparcos accelerations
Katz, Boaz; Waisberg, Idel; Klein, Ygal
The connection between the multiplicity of A stars and that of their white dwarf (WD) descendants is not known and the observational mappings of both multiplicities are far from complete. We are conducting an interferometric survey with VLTI/GRAVITY of 20 out of 108 southern A stars within the VAST sample which show large Gaia-Hipparcos proper mot…