Truly eccentric – I. Revisiting eight single-eccentric planetary systems

Wittenmyer, Robert A.; Clark, Jake T.; Zhao, Jun; Horner, Jonathan; Wang, Songhu; Johns, Daniel

doi:10.1093/mnras/stz290

Cited by 31 publications

(28 citation statements)

References 81 publications

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“…We also report updated orbital parameters for HD 50499b (Vogt et al 2005), as well as the detection of HD 50499c, which has previously been noted by Vogt et al (2005), Butler et al (2017), and Barbato et al (2018). We also report the updated orbital parameters of HD 92788b detected by Fischer et al (2001) and confirm the recent detection of HD 92788c (Wittenmyer et al 2019).…”

Section: Introductionsupporting

confidence: 59%

“…We present updated orbital parameters for a known exoplanet around HD 98649 (Marmier et al 2013). We also report updated orbital parameters for HD 92788b (Fischer et al 2001) and confirm the detection of HD 92788c (Wittenmyer et al 2019). Moreover, we report the discovery of a new planet around HD 50499 and report updated orbital parameters for HD 50499b (Vogt et al 2005).…”

Section: Updated Parameters For Known Exoplanetsmentioning

confidence: 55%

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The CORALIE survey for southern extrasolar planets

Rickman

Ségransan

Marmier

et al. 2019

A&A

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Context. Since 1998, a planet-search around main sequence stars within 50 pc in the southern hemisphere has been underway with the CORALIE spectrograph at La Silla Observatory. Aims. With an observing time span of more than 20 yr, the CORALIE survey is able to detect long-term trends in data with masses and separations large enough to select ideal targets for direct imaging. Detecting these giant companion candidates will allow us to start bridging the gap between radial-velocity-detected exoplanets and directly imaged planets and brown dwarfs. Methods. Long-term precise Doppler measurements with the CORALIE spectrograph reveal radial-velocity signatures of massive planetary companions and brown dwarfs on long-period orbits. Results. In this paper, we report the discovery of new companions orbiting HD 181234, HD 13724, HD 25015, HD 92987 and HD 50499. We also report updated orbital parameters for HD 50499b, HD 92788b and HD 98649b. In addition, we confirm the recent detection of HD 92788c. The newly reported companions span a period range of 15.6–40.4 yr and a mass domain of 2.93–26.77 MJup, the latter of which straddles the nominal boundary between planets and brown dwarfs. Conclusions. We report the detection of five new companions and updated parameters of four known extrasolar planets. We identify at least some of these companions to be promising candidates for imaging and further characterisation.

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Section: Introductionsupporting

confidence: 59%

Section: Updated Parameters For Known Exoplanetsmentioning

confidence: 55%

The CORALIE survey for southern extrasolar planets

Rickman

Ségransan

Marmier

et al. 2019

A&A

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“…Such an outcome is far from unusual -and, indeed, it is often the case that, with more data, a single eccentric planet seen in RV data is resolved to actually be two planets moving on near-circular orbits (e.g. Wittenmyer et al 2013Wittenmyer et al , 2019. For now, however, we can do no more than to call the existence of HD 67087 c into question, pending the acquisition of such additional data.…”

Section: Discussionmentioning

confidence: 98%

“…We determine the best-fitting parameters and uncertainties for each system using the code Exoplanet Mcmc Parallel tEmpering Radial velOcity fitteR 1 (ASTROEMPEROR), which uses thermodynamic methods combined with MCMC. Our approach has previously been established and described in Marshall et al (2019) and Wittenmyer et al (2019). We summarize the input values and constraints used in the fitting presented in this work for the sake of reproducibility.…”

Section: Modellingmentioning

confidence: 99%

“…Long-term follow-up of known planet host systems is therefore desirable to refine the orbital parameters for known companions, to infer the presence of additional companions at lower masses and/or larger semimajor axes (e.g. Becker & Adams 2017;Denham et al 2019;Horner et al 2019;Kane et al 2019;Rickman et al 2019;Wittenmyer et al 2019), and to disentangle the complex signals produced by planets on resonant (e.g. Anglada-Escudé, López-Morales & Chambers 2010;Wittenmyer et al 2012cWittenmyer et al , 2014aWittenmyer et al , 2016a or eccentric orbits (e.g.…”

mentioning

confidence: 99%

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Stability analysis of three exoplanet systems

Marshall

Horner

Wittenmyer

et al. 2020

Monthly Notices of the Royal Astronomical Society

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The orbital solutions of published multiplanet systems are not necessarily dynamically stable on time-scales comparable to the lifetime of the system as a whole. For this reason, dynamical tests of the architectures of proposed exoplanetary systems are a critical tool to probe the stability and feasibility of the candidate planetary systems, with the potential to point the way towards refined orbital parameters of those planets. Such studies can even help in the identification of additional companions in such systems. Here, we examine the dynamical stability of three planetary systems, orbiting HD 67087, HD 110014, and HD 133131A. We use the published radial velocity measurements of the target stars to determine the best-fitting orbital solutions for these planetary systems using the systemic console. We then employ the N-body integrator mercury to test the stability of a range of orbital solutions lying within 3σ of the nominal best fit for a duration of 100 Myr. From the results of the N-body integrations, we infer the best-fitting orbital parameters using the Bayesian package astroemperor. We find that both HD 110014 and HD 133131A have long-term stable architectures that lie within the 1σ uncertainties of the nominal best fit to their previously determined orbital solutions. However, the HD 67087 system exhibits a strong tendency towards instability on short time-scales. We compare these results to the predictions made from consideration of the angular momentum deficit criterion, and find that its predictions are consistent with our findings.

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On the dynamical evolution of two-planet extrasolar systems orbiting one of the stars of wide binaries separated by less than 3000 au

Correa-Otto,

Molina

2024

Icarus

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Truly eccentric – I. Revisiting eight single-eccentric planetary systems

Cited by 31 publications

References 81 publications

The CORALIE survey for southern extrasolar planets

The CORALIE survey for southern extrasolar planets

Stability analysis of three exoplanet systems

On the dynamical evolution of two-planet extrasolar systems orbiting one of the stars of wide binaries separated by less than 3000 au

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