The Gemini NICI Planet-Finding Campaign: The Orbit of the Young Exoplanet beta Pictoris b

Abstract

We present new astrometry for the young (12--21 Myr) exoplanet beta Pictoris b taken with the Gemini/NICI and Magellan/MagAO instruments between 2009 and 2012. The high dynamic range of our observations allows us to measure the relative position of beta Pic b with respect to its primary star with greater accuracy than previous observations. Based on a Markov Chain Monte Carlo analysis, we find the planet has an orbital semi-major axis of 9.1 (+5.3, -0.5) AU and orbital eccentricity <0.15 at 68% confidence (with 95% confidence intervals of 8.2--48 AU and 0.00--0.82 for semi-major axis and eccentricity, respectively, due to a long narrow degenerate tail between the two). We find that the planet has reached its maximum projected elongation, enabling higher precision determination of the orbital parameters than previously possible, and that the planet's projected separation is currently decreasing. With unsaturated data of the entire beta Pic system (primary star, planet, and disk) obtained thanks to NICI's semi-transparent focal plane mask, we are able to tightly constrain the relative orientation of the circumstellar components. We find the orbital plane of the planet lies between the inner and outer disks: the position angle (PA) of nodes for the planet's orbit (211.8 +/- 0.3 degrees) is 7.4 sigma greater than the PA of the spine of the outer disk and 3.2 sigma less than the warped inner disk PA, indicating the disk is not collisionally relaxed. Finally, for the first time we are able to dynamically constrain the mass of the primary star beta Pic to 1.76 (+0.18, -0.17) solar masses.

arXiv commentApJ in press. The most significant addition is new analysis of NICI data strengthening the misalignment of the orbit with both disks. Notable minor changes include slightly revised orbital parameter PDFs, a comparison to Macintosh et al (2014) with generally good agreement, comparison to previous disk-planet alignment results, and improved measurement of the star's dynamical mass (10% precision)

References in corpus (37)

• Validation of the new Hipparcos reduction
• A giant planet imaged in the disk of the young star Beta Pictoris
• A probable giant planet imaged in the Beta Pictoris disk
• Dynamical Origin of Extrasolar Planet Eccentricity Distribution
• Improving the Efficiency of Markov Chain Monte Carlo for Analyzing the Orbits of Extrasolar Planets
• Quantifying the Uncertainty in the Orbits of Extrasolar Planets
• The fast spin-rotation of a young extrasolar planet
• A planet on an inclined orbit as an explanation of the warp in the Beta Pictoris disk
• A lithium depletion boundary age of 21 Myr for the Beta Pictoris moving group
• The Gemini NICI Planet-Finding Campaign: The Frequency of Planets around Young Moving Group Stars
• The Age of Beta Pic
• HST/ACS Multiband Coronagraphic Imaging of the Debris Disk around Beta Pictoris
• Dynamical modeling of large scale asymmetries in the beta Pictoris dust disk
• Orbital characterization of the βPictoris b giant planet
• Predictions for a planet just inside Fomalhaut's eccentric ring
• The Gemini NICI Planet-Finding Campaign: The Frequency of Giant Planets around Young B and A Stars
• The Gemini NICI Planet-Finding Campaign: Discovery of a Close Substellar Companion to the Young Debris Disk Star PZ Tel
• High Orbital Eccentricities of Extrasolar Planets Induced by the Kozai Mechanism
• The Gemini NICI Planet-Finding Campaign : Discovery of a Substellar L Dwarf Companion to the Nearby Young M Dwarf CD-35 2722
• The near-infrared spectral energy distribution of β Pictoris b
• The Inner Rings of Beta Pictoris
• Keck Laser Guide Star Adaptive Optics Monitoring of 2MASS J1534-2952AB: First Dynamical Mass Determination of a Binary T Dwarf
• beta Pic b position relative to the Debris Disk
• The Gemini NICI Planet-Finding Campaign: The Frequency of Giant Planets Around Debris Disk Stars
• Studying the Physical Diversity of Late-M Dwarfs with Dynamical Masses
• Searching for companions down to 2 AU from beta Pictoris using the L'-band AGPM coronagraph on VLT/NACO
• The Gemini NICI Planet-Finding Campaign: Discovery of a Multiple System Orbiting the Young A Star HD 1160
• On the misalignment of the directly imaged planet β Pictoris b with the system's warped inner disk
• 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
• The Gemini NICI Planet-Finding Campaign: The Companion Detection Pipeline
• Magellan Adaptive Optics first-light observations of the exoplanet $\beta$ Pic b. I. Direct imaging in the far-red optical with MagAO+VisAO and in the near-IR with NICI
• Constrains on planets around beta Pic with Harps radial velocity data
• Predictions for Shepherding Planets in Scattered Light Images of Debris Disks
• SMACK: A New Algorithm for Modeling Collisions and Dynamics of Planetesimals in Debris Disks
• On the Eccentricity Distribution of Short-Period Single-Planet Systems
• High Resolution Images of Orbital Motion in the Orion Trapezium Cluster with the LBT Adaptive Optics System
• Independent confirmation of β Pictoris b imaging with NICI

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• 1 to 2.4 micron Near-IR spectrum of the Giant Planet $\beta$ Pictoris b obtained with the Gemini Planet Imager
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• The Orbit and Transit Prospects for $\beta$ Pictoris b constrained with One Milliarcsecond Astrometry
• Magellan Adaptive Optics first-light observations of the exoplanet beta Pic b. II. 3-5 micron direct imaging with MagAO+Clio, and the empirical bolometric luminosity of a self-luminous giant planet
• Astrometric Confirmation and Preliminary Orbital Parameters of the Young Exoplanet 51 Eridani b with the Gemini Planet Imager
• A Model-Independent Mass and Moderate Eccentricity for $\beta$ Pic b
• The Inner Disk Structure, Disk-Planet Interactions, and Temporal Evolution in the Beta Pictoris System: A Two-Epoch HST/STIS Coronagraphic Study
• Precise Dynamical Masses and Orbital Fits for $\beta$ Pic b and $\beta$ Pic c
• The Gemini Planet Imager Exoplanet Survey: Dynamical Mass of the Exoplanet beta Pictoris b from Combined Direct Imaging and Astrometry
• A SMACK Model of Colliding Planetesimals in the $\beta$ Pictoris Debris Disk
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• The Gemini NICI Planet-Finding Campaign: Asymmetries in the HD 141569 disc
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• The orbit of Beta Pic b as a transiting planet
• bRing: An observatory dedicated to monitoring the $\beta$ Pictoris b Hill sphere transit
• MagAO: Status and Science
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• Dynamical Mass Estimates of the $\beta$ Pictoris Planetary System Through Gaussian Process Stellar Activity Modelling
• Sparse aperture masking at the VLT II. Detection limits for the eight debris disks stars $\beta$ Pic, AU Mic, 49 Cet, $\eta$ Tel, Fomalhaut, g Lup, HD181327 and HR8799
• Formation of the warped debris disc around $\beta$ Pictoris
• Effects of Mirror Seeing on High-Contrast Adaptive Optics Instruments
• Direct Imaging Discovery of Giant Exoplanet $\beta$ Pictoris d: A Decade-Long Game of Hide-and-Seek
• Update on the Preliminary Design of SCALES: the Santa Cruz Array of Lenslets for Exoplanet Spectroscopy