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Constraining the Orbit and Mass of epsilon Eridani b with Radial Velocities, Hipparcos IAD-Gaia DR2 Astrometry, and Multiepoch Vortex Coronagraphy Upper Limits

Llop-Sayson, Jorge (author)
California Institute of Technology, USA
Wang, Jason J. (author)
California Institute of Technology, USA
Ruffio, Jean-Baptiste (author)
California Institute of Technology, USA
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Mawet, Dimitri (author)
California Institute of Technology/Jet Propulsion Laboratory, USA
Blunt, Sarah (author)
California Institute of Technology, USA
Absil, Olivier (author)
Université de Liège, Belgium
Bond, Charlotte (author)
Science and Technology Facilities Council, United Kingdom
Brinkman, Casey (author)
University of Hawaii, USA
Bowler, Brendan P. (author)
The University of Texas at Austin, USA
Bottom, Michael (author)
University of Hawaii, USA
Chontos, Ashley (author)
University of Hawaii, USA
Dalba, Paul A. (author)
University of California Riverside, USA
Fulton, B. J. (author)
California Institute of Technology, USA
Giacalone, Steven (author)
University of California at Berkeley, USA
Hill, Michelle (author)
University of California Riverside, USA
Hirsch, Lea A. (author)
Stanford University, USA
Howard, Andrew W. (author)
California Institute of Technology, USA
Isaacson, Howard (author)
University of Southern Queensland, Australia
Karlsson, Mikael (author)
Uppsala universitet,Tillämpad materialvetenskap
Lubin, Jack (author)
University of California Irvine, USA
Madurowicz, Alex (author)
Stanford University, USA
Matthews, Keith (author)
California Institute of Technology, USA
Morris, Evan (author)
University of California Santa Cruz, USA
Perrin, Marshall (author)
Space Telescope Science Institute, USA
Ren, Bin (author)
California Institute of Technology, USA
Rice, Malena (author)
Yale University, USA
Rosenthal, Lee J. (author)
California Institute of Technology, USA
Ruane, Garreth (author)
Jet Propulsion Laboratory, USA
Rubenzahl, Ryan (author)
California Institute of Technology, USA
Sun, He (author)
California Institute of Technology, USA
Wallack, Nicole (author)
California Institute of Technology, USA
Xuan, Jerry W. (author)
California Institute of Technology, USA
Ygouf, Marie (author)
Jet Propulsion Laboratory, USA
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 (creator_code:org_t)
2021-10-06
2021
English.
In: Astronomical Journal. - : Institute of Physics Publishing (IOPP). - 0004-6256 .- 1538-3881. ; 162:5
Related links:
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https://urn.kb.se/re...
https://doi.org/10.3...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • epsilon Eridani is a young planetary system hosting a complex multibelt debris disk and a confirmed Jupiter-like planet orbiting at 3.48 au from its host star. Its age and architecture are thus reminiscent of the early Solar System. The most recent study of Mawet et al., which combined radial-velocity data and Ms-band direct imaging upper limits, started to constrain the planet's orbital parameters and mass, but are still affected by large error bars and degeneracies. Here we make use of the most recent data compilation from three different techniques to further refine epsilon Eridani b's properties: RVs, absolute astrometry measurements from the Hipparcos and Gaia missions, and new Keck/NIRC2 Ms-band vortex coronagraph images. We combine this data in a Bayesian framework. We find a new mass, M-b = 0.66(-0.09)(+0.12) M-Jup, and inclination, i = 78.81(-22.41 degrees)(+29.34), with at least a factor 2 of improvement over previous uncertainties. We also report updated constraints on the longitude of the ascending node, the argument of the periastron, and the time of periastron passage. With these updated parameters, we can better predict the position of the planet at any past and future epoch, which can greatly help define the strategy and planning of future observations and with subsequent data analysis. In particular, these results can assist the search for a direct detection with JWST and the Nancy Grace Roman Space Telescope's coronagraph instrument.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
TEKNIK OCH TEKNOLOGIER  -- Materialteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Materials Engineering (hsv//eng)

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