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Title: Astrometric confirmation and preliminary orbital parameters of the young exoplanet 51 Eridani b with the Gemini Planet Imager

Journal Article · · The Astrophysical Journal. Letters (Online)
 [1];  [2];  [3];  [1];  [4];  [5];  [6];  [7];  [1];  [1];  [8];  [8];  [9];  [8];  [8];  [10];  [11];  [12];  [13];  [14] more »;  [7];  [15];  [1];  [12];  [16];  [17];  [18];  [19];  [20];  [16];  [1];  [7];  [13];  [21];  [13];  [22];  [23];  [24];  [25];  [6];  [25];  [19];  [8];  [26];  [6];  [14];  [4];  [27];  [25];  [18] « less
  1. Univ. of California, Berkeley, CA (United States)
  2. SETI Institute, Mountain View, CA (United States); Stanford Univ., Stanford, CA (United States)
  3. SETI Institute, Mountain View, CA (United States); Brown Univ., Providence, RI (United States)
  4. Univ. of California, San Diego, La Jolla, CA (United States)
  5. National Research Council of Canada Herzberg, Victoria, BC (Canada); Univ. of Victoria, Victoria, BC (Canada)
  6. Space Telescope Science Institute, Baltimore, MD (United States)
  7. Univ. de Montreal, Montreal, QC (Canada)
  8. Stanford Univ., Stanford, CA (United States)
  9. Univ. of Chicago, Chicago, IL (United States)
  10. SETI Institute, Mountain View, CA (United States)
  11. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  12. Univ. of California, Los Angeles, CA (United States)
  13. Univ. of Toronto, Toronto, ON (Canada)
  14. Univ. of Georgia, Athens, GA (United States)
  15. Univ. of California, Berkeley, CA (United States); Univ. Grenoble Alpes/CNRS, Grenoble (France)
  16. Univ. of Victoria, Victoria, BC (Canada)
  17. Durham Univ., Durham (United Kingdom); Gemini Observatory, La Serena (Chile)
  18. Johns Hopkins Univ., Baltimore, MD (United States)
  19. Gemini Observatory, Hilo, HI (United States)
  20. Large Synoptic Survey Telescope, Tucson, AZ (United States)
  21. The Univ. of Western Ontario, London, ON (Canada); Stony Brook Univ., Stony Brook, NY (United States)
  22. Univ. of Arizona, Tucson, AZ (United States)
  23. American Museum of Natural History, New York, NY (United States)
  24. Stony Brook Univ., Stony Brook, NY (United States)
  25. Arizona State Univ., Tempe, AZ (United States)
  26. Univ. of Toledo, Toledo, OH (United States)
  27. California Inst. of Technology (CalTech), Pasadena, CA (United States)
+ Show Author Affiliations

We present new Gemini Planet Imager observations of the young exoplanet 51 Eridani b that provide further evidence that the companion is physically associated with 51 Eridani. Combining this new astrometric measurement with those reported in the literature, we significantly reduce the posterior probability that 51 Eridani b is an unbound foreground or background T-dwarf in a chance alignment with 51 Eridani to 2 × 10–7, an order of magnitude lower than previously reported. If 51 Eridani b is indeed a bound object, then we have detected orbital motion of the planet between the discovery epoch and the latest epoch. By implementing a computationally efficient Monte Carlo technique, preliminary constraints are placed on the orbital parameters of the system. The current set of astrometric measurements suggest an orbital semimajor axis of $${14}_{-3}^{+7}$$ AU, corresponding to a period of $${41}_{-12}^{+35}$$ years (assuming a mass of 1.75 M⊙ for the central star), and an inclination of $${138}_{-13}^{+15}$$ deg. The remaining orbital elements are only marginally constrained by the current measurements. As a result, these preliminary values suggest an orbit that does not share the same inclination as the orbit of the distant M-dwarf binary, GJ 3305, which is a wide physically bound companion to 51 Eridani.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1324508
Report Number(s):
LLNL-JRNL--678574
Journal Information:
The Astrophysical Journal. Letters (Online), Journal Name: The Astrophysical Journal. Letters (Online) Journal Issue: 1 Vol. 814; ISSN 2041-8213
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (43)

Spectral and atmospheric characterization of 51 Eridani b using VLT/SPHERE journal July 2017
Hint of curvature in the orbital motion of the exoplanet 51 Eridani b using 3 yr of VLT/SPHERE monitoring journal April 2019
ISPY – NaCo Imaging Survey for Planets around Young stars: Discovery of an M dwarf in the gap between HD 193571 and its debris ring⋆ ,⋆⋆ journal July 2019
Imaging Extrasolar Giant Planets journal August 2016
Constraining the presence of giant planets in two-belt debris disc systems with VLT/SPHERE direct imaging and dynamical arguments journal July 2018
The exoplanet handbook: Book Review journal March 2012
The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics from 10 to 100 au text January 2019
A Quantitative Comparison of Exoplanet Catalogs journal August 2018
THE ORBIT AND TRANSIT PROSPECTS FOR β PICTORIS b CONSTRAINED WITH ONE MILLIARCSECOND ASTROMETRY journal October 2016
IMAGING AN 80 au RADIUS DUST RING AROUND THE F5V STAR HD 157587 journal October 2016
Orbits for the Impatient: A Bayesian Rejection-sampling Method for Quickly Fitting the Orbits of Long-period Exoplanets journal April 2017
Characterizing 51 Eri b from 1 to 5 μ m: A Partly Cloudy Exoplanet journal June 2017
Direct Imaging of the HD 35841 Debris Disk: A Polarized Dust Ring from Gemini Planet Imager and an Outer Halo from HST /STIS journal July 2018
Dynamical Constraints on the HR 8799 Planets with GPI journal October 2018
Atmospheric Characterization of Directly Imaged Exoplanets with JWST /MIRI journal November 2018
Orbital Motion of the Wide Planetary-mass Companion GSC 6214-210 b: No Evidence for Dynamical Scattering journal January 2019
Three Direct Imaging Epochs Could Constrain the Orbit of Earth 2.0 inside the Habitable Zone journal April 2019
The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics from 10 to 100 au journal June 2019
Performance of the Gemini Planet Imager Non-redundant Mask and Spectroscopy of Two Close-separation Binaries: HR 2690 and HD 142527 journal June 2019
Radial Velocity Discovery of an Eccentric Jovian World Orbiting at 18 au journal October 2019
An Updated Visual Orbit of the Directly Imaged Exoplanet 51 Eridani b and Prospects for a Dynamical Mass Measurement with Gaia journal December 2019
Population-level Eccentricity Distributions of Imaged Exoplanets and Brown Dwarf Companions: Dynamical Evidence for Distinct Formation Channels journal January 2020
The Gemini Planet Imager Exoplanet Survey: Dynamical Mass of the Exoplanet β Pictoris b from Combined Direct Imaging and Astrometry journal January 2020
Imaging the 44 au Kuiper Belt Analog Debris Ring around HD 141569A with GPI Polarimetry journal January 2020
Multiple Spiral Arms in the Disk around Intermediate-mass Binary HD 34700A journal February 2019
An Exo–Kuiper Belt with an Extended Halo around HD 191089 in Scattered Light journal September 2019
ISPY - NaCo Imaging Survey for Planets around Young stars Discovery of an M dwarf in the gap between HD193571 and its debris ring text January 2019
Imaging Extrasolar Giant Planets text January 2016
Imaging an 80 AU Radius Dust Ring Around the F5V Star HD 157587 text January 2016
Orbits for the Impatient: A Bayesian Rejection Sampling Method for Quickly Fitting the Orbits of Long-Period Exoplanets text January 2017
Spectral and atmospheric characterization of 51 Eridani b using VLT/SPHERE text January 2017
Constraining the presence of giant planets in two-belt debris disk systems with VLT/SPHERE direct imaging and dynamical arguments text January 2018
A Quantitative Comparison of Exoplanet Catalogs text January 2018
Atmospheric characterization of directly imaged exoplanets with JWST/MIRI text January 2018
Three direct imaging epochs could constrain the orbit of Earth 2.0 inside the habitable zone text January 2019
Performance of the Gemini Planet Imager Non-Redundant Mask and spectroscopy of two close-separation binaries HR 2690 and HD 142527 text January 2019
An Exo-Kuiper Belt and An Extended Halo around HD 191089 in Scattered Light text January 2019
An updated visual orbit of the directly-imaged exoplanet 51 Eridani b and prospects for a dynamical mass measurement with Gaia text January 2019
Population-Level Eccentricity Distributions of Imaged Exoplanets and Brown Dwarf Companions: Dynamical Evidence for Distinct Formation Channels text January 2019
The Gemini Planet Imager Exoplanet Survey: Dynamical Mass of the Exoplanet beta Pictoris b from Combined Direct Imaging and Astrometry text January 2019
Imaging the 44 AU Kuiper Belt-analogue debris ring around HD 141569A with GPI polarimetry text January 2019
A Quantitative Comparison of Exoplanet Catalogs text January 2018
Spectral and atmospheric characterization of 51 Eridani b using VLT/SPHERE text January 2017

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