VLT/NACO astrometry of the HR8799 planetary system. L'-band observations of the three outer planets

Abstract

HR8799 is so far the only directly imaged multiple exoplanet system. The orbital configuration would, if better known, provide valuable insight into the formation and dynamical evolution of wide-orbit planetary systems. We present L'-band observations of the HR8799 system obtained with NACO at VLT, adding to the astrometric monitoring of the planets HR8799b, c and d. We investigate how well the two simple cases of (i) a circular orbit and (ii) a face-on orbit fit the astrometric data for HR8799d over a total time baseline of ~2 years. The results indicate that the orbit of HR8799d is inclined with respect to our line of sight, and suggest that the orbit is slightly eccentric or non-coplanar with the outer planets and debris disk.

5 pages, 4 figures, 1 table, accepted for publication in A\&A. Updated version includes minor changes made in the proofs

References in corpus (9)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Images of a fourth planet orbiting HR 8799
• Optical Images of an Exosolar Planet 25 Light Years from Earth
• A Combined Subaru/VLT/MMT 1--5 Micron Study of Planets Orbiting HR 8799: Implications for Atmospheric Properties, Masses, and Formation
• Direct Imaging and Spectroscopy of a Planetary Mass Candidate Companion to a Young Solar Analog
• Refractive Index of Humid Air in the Infrared: Model Fits
• HST/NICMOS detection of HR 8799 b in 1998
• Determination of the inclination of the multi-planet hosting star HR8799 using asteroseismology
• Impact of the Atmospheric Refraction on the Precise Astrometry with Adaptive Optics in Infrared

Cited by in corpus (21)

• Imaging Extrasolar Giant Planets
• First light of the VLT planet finder SPHERE. III. New spectrophotometry and astrometry of the HR8799 exoplanetary system
• Orbital characterization of the βPictoris b giant planet
• Constraining the initial entropy of directly-detected exoplanets
• Atmospheric Retrieval Analysis of the Directly Imaged Exoplanet HR 8799b
• Reconnaissance of the HR 8799 Exosolar System II: Astrometry and Orbital Motion
• The Gemini NICI Planet-Finding Campaign: Discovery of a Multiple System Orbiting the Young A Star HD 1160
• Multiple mean motion resonances in the HR 8799 planetary system
• Astrometric Monitoring of the HR 8799 Planets: Orbit Constraints from Self-Consistent Measurements
• A 5 Micron Image of beta Pictoris b at a Sub-Jupiter Projected Separation: Evidence for a Misalignment Between the Planet and the Inner, Warped Disk
• VLT/SPHERE robust astrometry of the HR8799 planets at milliarcsecond-level accuracy Orbital architecture analysis with PyAstrOFit
• LBT observations of the HR 8799 planetary system: First detection of HR8799e in H band
• High-Mass, Four-Planet Models for HR 8799: Constraining the Orbital Inclination and Age of the System
• The LEECH Exoplanet Imaging Survey. Further constraints on the planet architecture of the HR 8799 system
• Four-of-a-kind? Comprehensive atmospheric characterisation of the HR 8799 planets with VLTI/GRAVITY
• Orbital and dynamical analysis of the system around HR 8799. New astrometric epochs from VLT/SPHERE and LBT/LUCI
• An exact, generalised Laplace resonance in the HR 8799 planetary system
• The orbital architecture and debris disks of the HR 8799 planetary system
• JWST-TST High Contrast: Living on the Wedge, or, NIRCam Bar Coronagraphy Reveals CO${}_2$ in the HR 8799 and 51 Eri Exoplanets' Atmospheres
• Deep orbital search for additional planets in the HR 8799 system
• Toward Complete Characterization: Prospects for Directly Imaging Transiting Exoplanets