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Direct discovery of the inner exoplanet in the HD206893 system
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(2023) Direct discovery of the inner exoplanet in the HD206893 system. Astronomy & Astrophysics, 671 . L5. doi:10.1051/0004-6361/202244727 ISSN 0004-6361.
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Official URL: https://doi.org/10.1051/0004-6361/202244727
Abstract
Long term precise radial velocity (RV) monitoring of the nearby star HD206893, as well as anomalies in the system proper motion, have suggested the presence of an additional, inner companion in the system. Here we describe the results of a multi-epoch search for the companion responsible for this RV drift and proper motion anomaly using the VLTI/GRAVITY instrument. Utilizing information from ongoing precision RV measurements with the HARPS spectrograph, as well as Gaia host star astrometry, we report a high significance detection of the companion HD206893c over three epochs, with clear evidence for Keplerian orbital motion. Our astrometry with ∼ 50-100 μ arcsec precision afforded by GRAVITY allows us to derive a dynamical mass of 12.7 +1.2−1.0 M Jup and an orbital separation of 3.53 +0.08−0.06 au for HD206893c. Our fits to the orbits of both companions in the system utilize both Gaia astrometry and RVs to also provide a precise dynamical estimate of the previously uncertain mass of the B component, and therefore derive an age of 155±15 Myr. We find that theoretical atmospheric/evolutionary models incorporating deuterium burning for HD206893c, parameterized by cloudy atmospheres provide a good simultaneous fit to the luminosity of both HD206893B and c. In addition to utilizing long-term RV information, this effort is an early example of a direct imaging discovery of a bona fide exoplanet that was guided in part with Gaia astrometry. Utilizing Gaia astrometry is expected to be one of the primary techniques going forward to identify and characterize additional directly imaged planets. Lastly, this discovery is another example of the power of optical interferometry to directly detect and characterize extrasolar planets where they form at ice-line orbital separations of 2-4\,au.
Item Type: | Journal Article | ||||||||||||||||||
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Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Extrasolar planets , Extrasolar planets -- Detection, Planetary systems, Interferometry , Brown dwarf stars | ||||||||||||||||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||||||||||||||||
Publisher: | EDP Sciences | ||||||||||||||||||
ISSN: | 0004-6361 | ||||||||||||||||||
Official Date: | 2 March 2023 | ||||||||||||||||||
Dates: |
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Volume: | 671 | ||||||||||||||||||
Article Number: | L5 | ||||||||||||||||||
DOI: | 10.1051/0004-6361/202244727 | ||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||
Date of first compliant deposit: | 19 December 2022 | ||||||||||||||||||
Date of first compliant Open Access: | 8 March 2023 | ||||||||||||||||||
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