DOI | Resolve DOI: https://doi.org/10.3847/1538-3881/ab4da4 |
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Author | Search for: Rosa, Robert J. DeORCID identifier: https://orcid.org/0000-0002-4918-0247; Search for: Nielsen, Eric L.ORCID identifier: https://orcid.org/0000-0001-6975-9056; Search for: Wang, Jason J.ORCID identifier: https://orcid.org/0000-0003-0774-6502; Search for: Ammons, S. MarkORCID identifier: https://orcid.org/0000-0001-5172-7902; Search for: Duchêne, GaspardORCID identifier: https://orcid.org/0000-0002-5092-6464; Search for: Macintosh, BruceORCID identifier: https://orcid.org/0000-0003-1212-7538; Search for: Rameau, JulienORCID identifier: https://orcid.org/0000-0003-0029-0258; Search for: Bailey, Vanessa P.ORCID identifier: https://orcid.org/0000-0002-5407-2806; Search for: Barman, TravisORCID identifier: https://orcid.org/0000-0002-7129-3002; Search for: Bulger, JoannaORCID identifier: https://orcid.org/0000-0003-4641-2003; Search for: Chilcote, JeffreyORCID identifier: https://orcid.org/0000-0001-6305-7272; Search for: Cotten, TaraORCID identifier: https://orcid.org/0000-0003-0156-3019; Search for: Doyon, Rene; Search for: Esposito, Thomas M.ORCID identifier: https://orcid.org/0000-0002-0792-3719; Search for: Fitzgerald, Michael P.ORCID identifier: https://orcid.org/0000-0002-0176-8973; Search for: Follette, Katherine B.ORCID identifier: https://orcid.org/0000-0002-7821-0695; Search for: Gerard, Benjamin L.1ORCID identifier: https://orcid.org/0000-0003-3978-9195; Search for: Goodsell, Stephen J.ORCID identifier: https://orcid.org/0000-0002-4144-5116; Search for: Graham, James R.; Search for: Greenbaum, Alexandra Z.ORCID identifier: https://orcid.org/0000-0002-7162-8036; Search for: Hibon, PascaleORCID identifier: https://orcid.org/0000-0003-3726-5494; Search for: Hom, Justin; Search for: Hung, Li-WeiORCID identifier: https://orcid.org/0000-0003-1498-6088; Search for: Ingraham, PatrickORCID identifier: https://orcid.org/0000-0003-3715-8138; Search for: Kalas, Paul; Search for: Konopacky, QuinnORCID identifier: https://orcid.org/0000-0002-9936-6285; Search for: Larkin, James E.ORCID identifier: https://orcid.org/0000-0001-7687-3965; Search for: Maire, Jérôme; Search for: Marchis, FranckORCID identifier: https://orcid.org/0000-0001-7016-7277; Search for: Marley, Mark S.ORCID identifier: https://orcid.org/0000-0002-5251-2943; Search for: Marois, ChristianORCID identifier: https://orcid.org/0000-0002-4164-4182; Search for: Metchev, StanimirORCID identifier: https://orcid.org/0000-0003-3050-8203; Search for: Millar-Blanchaer, Maxwell A.ORCID identifier: https://orcid.org/0000-0001-6205-9233; Search for: Oppenheimer, RebeccaORCID identifier: https://orcid.org/0000-0001-7130-7681; Search for: Palmer, DavidORCID identifier: https://orcid.org/0000-0001-7128-0802; Search for: Patience, Jennifer; Search for: Perrin, MarshallORCID identifier: https://orcid.org/0000-0002-3191-8151; Search for: Poyneer, Lisa; Search for: Pueyo, Laurent; Search for: Rajan, AbhijithORCID identifier: https://orcid.org/0000-0002-9246-5467; Search for: Rantakyrö, Fredrik T.ORCID identifier: https://orcid.org/0000-0002-9667-2244; Search for: Ren, Bin; Search for: Ruffio, Jean-BaptisteORCID identifier: https://orcid.org/0000-0003-2233-4821; Search for: Savransky, DmitryORCID identifier: https://orcid.org/0000-0002-8711-7206; Search for: Schneider, Adam C.ORCID identifier: https://orcid.org/0000-0002-6294-5937; Search for: Sivaramakrishnan, AnandORCID identifier: https://orcid.org/0000-0003-1251-4124; Search for: Song, InseokORCID identifier: https://orcid.org/0000-0002-5815-7372; Search for: Soummer, RemiORCID identifier: https://orcid.org/0000-0003-2753-2819; Search for: Tallis, Melisa; Search for: Thomas, SandrineORCID identifier: https://orcid.org/0000-0002-9121-3436; Search for: Wallace, J. Kent; Search for: Ward-Duong, KimberlyORCID identifier: https://orcid.org/0000-0002-4479-8291; Search for: Wiktorowicz, SloaneORCID identifier: https://orcid.org/0000-0003-4483-5037; Search for: Wolff, SchuylerORCID identifier: https://orcid.org/0000-0002-9977-8255 |
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Affiliation | - National Research Council of Canada. Herzberg Astronomy and Astrophysics
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Format | Text, Article |
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Subject | coronographic imaging; astrometry; exoplanet dynamics |
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Abstract | We present a revision to the visual orbit of the young, directly imaged exoplanet 51 Eridani b using four years of observations with the Gemini Planet Imager. The relative astrometry is consistent with an eccentric ($e=0.53⁰.⁰⁹₋₀.₁₃) orbit at an intermediate inclination (i=136⁺¹⁰ °₋₁₁), although circular orbits cannot be excluded due to the complex shape of the multidimensional posterior distribution. We find a semimajor axis of 11.1⁺⁴.²₋₁.₃ au and a period of 28.1⁺¹⁷.²₋₄.₉ yr, assuming a mass of 1.75 M⊙ for the host star. We find consistent values with a recent analysis of VLT/SPHERE data covering a similar baseline. We investigate the potential of using the absolute astrometry of the host star to obtain a dynamical mass constraint for the planet. The astrometric acceleration of 51 Eri derived from a comparison of the Hipparcos and Gaia catalogs was found to be inconsistent at the 2σ–3σ level with the predicted reflex motion induced by the orbiting planet. Potential sources of this inconsistency include a combination of random and systematic errors between the two astrometric catalogs and the signature of an additional companion within the system interior to current detection limits. We also explored the potential of using Gaia astrometry alone for a dynamical mass measurement of the planet by simulating Gaia measurements of the motion of the photocenter of the system over the course of the extended 8 yr mission. We find that such a measurement is only possible (>98% probability) given the most optimistic predictions for the Gaia scan astrometric uncertainties for bright stars and a high mass for the planet (gsim3.6 M Jup). |
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Publication date | 2019-12-10 |
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Publisher | IOP |
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In | |
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Language | English |
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Peer reviewed | Yes |
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Export citation | Export as RIS |
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Report a correction | Report a correction (opens in a new tab) |
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Record identifier | 477131a1-7797-437a-af01-b66317988754 |
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Record created | 2020-10-30 |
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Record modified | 2021-09-17 |
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