HD 83443c: A Highly Eccentric Giant Planet on a 22 yr Orbit

Errico, Adriana and Wittenmyer, Robert A. and Horner, Jonathan and Li, Zhexing and Brandt, G. Mirek and Kane, Stephen R. and Fetherolf, Tara and Holt, Timothy R. and Carter, Brad ORCID: https://orcid.org/0000-0003-0035-8769 and Clark, Jake T. and Butler, R. P. and Tinney, C. G. and Ballard, Sarah and Bowler, Brendan P. and Kielkopf, John and Liu, Huigen and Plavchan, Peter P. and Shporer, Avi and Zhang, Hui and Wright, Duncan J. ORCID: https://orcid.org/0000-0001-7294-5386 and Addison, Brett C. ORCID: https://orcid.org/0000-0003-3216-0626 and Mengel, Matthew W. ORCID: https://orcid.org/0000-0002-7830-6822 and Okumura, Jack (2022) HD 83443c: A Highly Eccentric Giant Planet on a 22 yr Orbit. Astronomical Journal, 163 (6):273. pp. 1-19. ISSN 0004-6256

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Abstract

We report the discovery of a highly eccentric long-period Jovian planet orbiting the hot-Jupiter host HD 83443. By combining radial velocity data from four instruments (AAT/UCLES, Keck/HIRES, HARPS, Minerva-Australis) spanning more than two decades, we find evidence for a planet with m sin i=1.35-0.06+0.07 M J, moving on an orbit with a = 8.0 ± 0.8 au and eccentricity e = 0.76 ± 0.05. We combine our radial velocity analysis with Gaia eDR3 /Hipparcos proper motion anomalies and derive a dynamical mass of 1.5-0.2+0.5MJup . We perform a detailed dynamical simulation that reveals locations of stability within the system that may harbor additional planets, including stable regions within the habitable zone of the host star. HD 83443 is a rare example of a system hosting a hot Jupiter and an exterior planetary companion. The high eccentricity of HD 83443c suggests that a scattering event may have sent the hot Jupiter to its close orbit while leaving the outer planet on a wide and eccentric path.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 18 Jul 2022 01:17
Last Modified: 18 Jul 2022 01:17
Uncontrolled Keywords: Planet hosting stars; Radial velocity; Exoplanet astronomy; Exoplanet; dynamics; Subgiant stars; Astrometry; Astrophysics - Earth and Planetary Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.3847/1538-3881/ac6589
URI: http://eprints.usq.edu.au/id/eprint/49477

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