The HD 181433 Planetary System: Dynamics and a New Orbital Solution

Horner, Jonathan; Wittenmyer, Robert A.; Wright, D. E.; Hinse, T. C.; Marshall, Jonathan P.; Kane, Stephen R.; Clark, Jake T.; Mengel, M. W.; Agnew, Matthew T.; Johns, Daniel

doi:10.3847/1538-3881/ab2e78

Cited by 18 publications

(32 citation statements)

References 69 publications

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“…Herein we present a stability analysis of the exoplanetary sys-16 tem HD 181433 [37][38][39], in the context of the planar three-body 17 problem (3BP). We follow some considerations already presented 18 in [31], but now focus on the relationship between a computed 19 diffusion coefficient D S and a global instability time-scale associ-20 ated to specific initial conditions (ICs) in the phase space of the 21 system.…”

Section: A System Of Continuous Time: the Planar 3bp 15mentioning

confidence: 99%

The Shannon entropy: An efficient indicator of dynamical stability

Cincotta

Giordano

Silva

et al. 2021

Physica D: Nonlinear Phenomena

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Section: A System Of Continuous Time: the Planar 3bp 15mentioning

confidence: 99%

The Shannon entropy: An efficient indicator of dynamical stability

Cincotta

Giordano

Silva

et al. 2021

Physica D: Nonlinear Phenomena

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“…Given the uncertainty around the period of planet c, we are unable to perform a full dynamical analysis of the system, as in the work of e.g. Horner et al (2019). However, we can estimate the system stability by comparing the possible period scenarios of planet c to the general cases presented by Agnew et al (2019).…”

Section: Orbital Dynamicsmentioning

confidence: 99%

Planet Hunters TESS III: two transiting planets around the bright G dwarf HD 152843

Eisner

Nicholson

Barragán

et al. 2021

Monthly Notices of the Royal Astronomical Society

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We report on the discovery and validation of a two-planet system around a bright (V = 8.85 mag) early G dwarf (1.43 R⊙ , 1.15 M⊙ , TOI 2319) using data from NASA’s Transiting Exoplanet Survey Satellite (TESS). Three transit events from two planets were detected by citizen scientists in the month-long TESS light curve (sector 25), as part of the Planet Hunters TESS project. Modelling of the transits yields an orbital period of $11.6264 _{ - 0.0025 } ^ { + 0.0022 }$ days and radius of $3.41 _{ - 0.12 } ^ { + 0.14 }$ R⊕ for the inner planet, and a period in the range 19.26–35 days and a radius of $5.83 _{ - 0.14 } ^ { + 0.14 }$ R⊕ for the outer planet, which was only seen to transit once. Each signal was independently statistically validated, taking into consideration the TESS light curve as well as the ground-based spectroscopic follow-up observations. Radial velocities from HARPS-N and EXPRES yield a tentative detection of planet b, whose mass we estimate to be $11.56 _{ - 6.14 } ^ { + 6.58 }$ M⊕, and allow us to place an upper limit of 27.5 M⊕ (99 per cent confidence) on the mass of planet c. Due to the brightness of the host star and the strong likelihood of an extended H/He atmosphere on both planets, this system offers excellent prospects for atmospheric characterisation and comparative planetology.

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“…These criteria have been extensively used within dynamical astronomy, for both the Solar System and extrasolar planetary systems (e.g. Jenkins et al 2009;Hinse et al 2015;Wood et al 2017;Horner et al 2019). We applied the MEGNO implementation within the N-body integrator REBOUND (Rein & Liu 2012), which made use of the Wisdom-Holman WHfast code (Rein & Tamayo 2015).…”

Section: Stability Of the Systemmentioning

confidence: 99%

GJ 273: on the formation, dynamical evolution, and habitability of a planetary system hosted by an M dwarf at 3.75 parsec

Pozuelos

Suárez

Elía

et al. 2020

A&A

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Context. Planets orbiting low-mass stars such as M dwarfs are now considered a cornerstone in the search for planets with the potential to harbour life. GJ 273 is a planetary system orbiting an M dwarf only 3.75 pc away, which is composed of two confirmed planets, GJ 273b and GJ 273c, and two promising candidates, GJ 273d and GJ 273e. Planet GJ 273b resides in the habitable zone. Currently, due to a lack of observed planetary transits, only the minimum masses of the planets are known: Mb sin ib = 2.89 M⊕, Mc sin ic = 1.18 M⊕, Md sin id = 10.80 M⊕, and Me sin ie = 9.30 M⊕. Despite its interesting character, the GJ 273 planetary system has been poorly studied thus far. Aims. We aim to precisely determine the physical parameters of the individual planets, in particular, to break the mass–inclination degeneracy to accurately determine the mass of the planets. Moreover, we present a thorough characterisation of planet GJ 273b in terms of its potential habitability. Methods. First, we explored the planetary formation and hydration phases of GJ 273 during the first 100 Myr. Secondly, we analysed the stability of the system by considering both the two- and four-planet configurations. We then performed a comparative analysis between GJ 273 and the Solar System and we searched for regions in GJ 273 which may harbour minor bodies in stable orbits, that is, the main asteroid belt and Kuiper belt analogues. Results. From our set of dynamical studies, we find that the four-planet configuration of the system allows us to break the mass–inclination degeneracy. From our modelling results, the masses of the planets are unveiled as: 2.89 ≤ Mb ≤ 3.03 M⊕, 1.18 ≤ Mc ≤ 1.24 M⊕, 10.80 ≤ Md ≤ 11.35 M⊕, and 9.30 ≤ Me ≤ 9.70 M⊕. These results point to a system that is likely to be composed of an Earth-mass planet, a super-Earth and two mini-Neptunes. Based on planetary formation models, we determine that GJ 273b is likely an efficient water captor while GJ 273c is probably a dry planet. We find that the system may have several stable regions where minor bodies might reside. Collectively, these results are used to offer a comprehensive discussion about the habitability of GJ 273b.

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The HD 181433 Planetary System: Dynamics and a New Orbital Solution

Cited by 18 publications

References 69 publications

The Shannon entropy: An efficient indicator of dynamical stability

The Shannon entropy: An efficient indicator of dynamical stability

Planet Hunters TESS III: two transiting planets around the bright G dwarf HD 152843

GJ 273: on the formation, dynamical evolution, and habitability of a planetary system hosted by an M dwarf at 3.75 parsec

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