The Gemini Planet Imager Exoplanet Survey: Dynamical Mass of the Exoplanet β Pictoris b from Combined Direct Imaging and Astrometry

@article{Nielsen2020TheGP,
  title={The Gemini Planet Imager Exoplanet Survey: Dynamical Mass of the Exoplanet $\beta$ Pictoris b from Combined Direct Imaging and Astrometry},
  author={Eric L. Nielsen and Robert J. de Rosa and Jason J. Wang and Johannes Sahlmann and Paul Kalas and Gaspard Duch{\^e}ne and Julien Rameau and Mark. S. Marley and Didier Saumon and Bruce A. Macintosh and Maxwell A. Millar-Blanchaer and Meiji M. Nguyen and S. Mark Ammons and Vanessa P. Bailey and Travis S. Barman and Joanna Bulger and Jeffrey K. Chilcote and Tara H. Cotten and Ren{\'e} Doyon and Thomas M. Esposito and Michael P. Fitzgerald and Katherine B. Follette and Benjamin L. Gerard and Stephen J. Goodsell and James R. Graham and Alexandra Z. Greenbaum and Pascale Hibon and Li-Wei Hung and Patrick Ingraham and Quinn M. Konopacky and James E. Larkin and J'erome Maire and Franck Marchis and Christian Marois and Stanimir A. Metchev and Rebecca Oppenheimer and David Palmer and Jennifer L. Patience and Marshall D. Perrin and Lisa Ann Poyneer and Laurent Pueyo and Abhijith Rajan and Fredrik T. Rantakyr{\"o} and Jean-Baptiste Ruffio and Dmitry Savransky and Adam C. Schneider and Anand Sivaramakrishnan and Inseok Song and R{\'e}mi Soummer and Sandrine J. Thomas and J. Kent Wallace and Kimberly Ward-Duong and Sloane J. Wiktorowicz and Schuyler G. Wolff},
  journal={The Astronomical Journal},
  year={2020},
  volume={159}
}
We present new observations of the planet β Pictoris b from 2018 with the Gemini Planet Imager (GPI), the first GPI observations following conjunction. Based on these new measurements, we perform a joint orbit fit to the available relative astrometry from ground-based imaging, the Hipparcos Intermediate Astrometric Data (IAD), and the Gaia DR2 position, and demonstrate how to incorporate the IAD into direct imaging orbit fits. We find a mass consistent with predictions of hot-start evolutionary… 

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