Search Publications
VLTI/GRAVITY Observations of AF Lep b: Preference for Circular Orbits, Cloudy Atmospheres, and a Moderately Enhanced Metallicity
Pueyo, Laurent; Henning, Th.; Mollière, Paul +26 more
Direct imaging observations are biased toward wide-separation, massive companions that have degenerate formation histories. Although the majority of exoplanets are expected to form via core accretion, most directly imaged exoplanets have not been convincingly demonstrated to follow this formation pathway. We obtained new interferometric observatio…
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
Dynamical and Atmospheric Characterization of the Substellar Companion HD 33632 Ab from Direct Imaging, Astrometry, and Radial-velocity Data
Currie, Thayne; Tamura, Motohide; Kuzuhara, Masayuki +17 more
We present follow-up SCExAO/CHARIS H- and K-band (R ∼ 70) high-contrast integral field spectroscopy and Keck/NIRC2 photometry of directly imaged brown dwarf companion HD 33632 Ab and new radial-velocity data for the system from the SOPHIE spectrograph, complemented by Hipparcos and Gaia astrometry. These data enable more robust spectral characteri…
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…
Orbits of Six Triple Systems
Tokovinin, Andrei
Joint analysis of position measurements and radial velocities of six triple stellar systems is conducted to determine their inner and/or outer orbits. Accumulation of such data is needed to study the architecture of stellar hierarchies and its relation to the formation mechanisms. The inner periods in the six systems (HIP 11783, 64836, 72423, 8472…
A Maia-type candidate was misclassified: V424 Cep is an eclipsing β Cep-type pulsator in a triple system
Schmutz, W.; Koenigsberger, G.; Richer, M. G. +2 more
Context. V424 Cephei is an eclipsing binary system that has been classified as a Maia variable candidate. These objects are pulsators that apparently lie outside the theoretical instability strips. Aims. We determine the properties of V424 Cep and identify the nature of the pulsating variable. Methods. We analyzed photometric data obtained over th…
Contributions of `citizen science' to occultation astronomy
Beisker, Wolfgang; Guhl, Konrad; Midavaine, Thierry
The modern term `citizen science' describes a very old tradition in the natural sciences. Until the specialization of the sciences at the end of the eighteenth century, the emergence of technical universities and the formation of a modern scientific enterprise, citizen science was the norm. Since the 1960s, amateur astronomers have increasingly ob…
Discovery of a Jupiter Analog Misaligned to the Inner Planetary System in HD 73344
Huber, Daniel; Saunders, Nicholas; Fulton, Benjamin J. +6 more
We present the discovery of a Jupiter-like planet, HD 73344 d (
A multi-technique detection of an eccentric giant planet around the accelerating star HD 57625
Ertel, S.; Henning, Th.; Sozzetti, A. +42 more
Context. The synergy between different detection methods is a key asset in exoplanetology that allows the precise characterization of detected exoplanets and robust constraints even in the case of a non-detection. The interplay between imaging, radial velocities and astrometry has recently produced significant advancements in exoplanetary science.…
On the Orbit of the Binary Brown Dwarf Companion GL229 Ba and Bb
Henning, Thomas; Mérand, Antoine; Johnstone, Doug +21 more
The companion GL229B was recently resolved by Xuan et al. as a tight binary of two brown dwarfs (Ba and Bb) through VLTI-GRAVITY interferometry and Very Large Telescope-CRIRES+ radial velocity (RV) measurements. Here, we present Bayesian models of the interferometric and RV data in additional detail, along with an updated outer orbit of the brown …