Investigating Optimizing Mirror Orbits for Dark-side Illumination

Auteurs-es

  • Kaisa Elisabeth Anne Crawford-Taylor University of Wisconsin - LaCrosse

DOI :

https://doi.org/10.17307/wsc.v1i1.255

Mots-clés :

Astronomy, radiation pressure, Python

Résumé

When a planet is tidally locked with its star, the same side always faces the star; thus one side is always dark. This synchronization occurs quickly for potentially habitable Earth-like planets orbiting dim, low-mass stars. Korpela, Sallmen, & Leystra Greene (2015; KSG) suggest that advanced extraterrestrial civilizations may put large-scale mirror fleets in orbit around such exoplanets to reflect starlight to the dark side of the planet. They might also use such mirrors to alter the climate of their own or another planet. Radiation pressure (RP) will be important for such large, lightweight mirrors, but research on satellite orbit stability typically neglects its effects. The long-term goal of this research is to determine fuel-efficient satellite orbits in situations where RP is important. We use Python and REBOUND to simulate mirrors orbiting an Earth-like exoplanet in the habitable zone for a variety of stars. Our simulations use two settings: “Always RP†always reflects starlight towards the planet’s center while “Nighttime RP†only does so on its dark side. We found mirrors survive longer when initially orbiting face on to the star compared to edge on. We present a selection of results illustrating how RP affects the mirror’s survival time.

Biographie de l'auteur-e

Kaisa Elisabeth Anne Crawford-Taylor, University of Wisconsin - LaCrosse

Physics and mathematics major with computer science minor. Astrophysics is my research area. I am currently a 3rd year.

Références

Bennett, Jeffrey O., et al. The Cosmic Perspective. 8th ed., Pearson, 2017.

Gaidos, E. “Transit detection of a ‘starshade’ at the inner Lagrange point of an exoplanet.†Monthly Notices of the Royal Astronomical Society, vol. 469, no. 4, 4 May 2017, pp. 4455–4464., doi:10.1093/mnras/stx1078.

(KSG) Korpela, E. J., Sallmen, S. M., & Leystra Greene, D. (2015). Modeling Indications of Technology in Planetary Transit Light Curves-Dark-side Illumination. The Astrophysical Journal, 809(2), 139. doi:10.1088/0004-637X/ 809/2/139

Marcy, G. W., Isaacson, H., Howard, A. W., et al. 2014, ApJS, 210, 20 DOI:10.1088/0067-0049/210/2/20

Petigura, E. A., Howard, A. W., and Marcy, G. W. 2013, Proceedings of the National Academy of Science, 110, 19273 ADS: 2013PNAS..11019273P

Rein, H., and Liu, S. (2012). REBOUND: an open-source multi-purpose N- body code for collisional dynamics. Astronomy and Astrophysics, 537, A128. doi: 10.1051/0004-6361/201118085

Rein, H., and Spiegel, D. S. (2014). Ias15: a fast, adaptive, high-order integrator for gravitational dynamics, accurate to machine precision over a billion orbits. Monthly Notices of the Royal Astronomical Society, 446(2), 1424-1437. doi:10.1093/mnras/stu2164

Weiss, L. M., and Marcy, G. W. (2014). The Mass-Radius Relation For 65 Exoplanets Smaller Than 4 Earth Radii. The Astrophysical Journal, 783(1), L6. doi:10.1088/2041-8205/783/1/L6

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Publié-e

2019-02-08

Comment citer

Crawford-Taylor, K. E. A. (2019). Investigating Optimizing Mirror Orbits for Dark-side Illumination. Proceedings of the Wisconsin Space Conference, 1(1). https://doi.org/10.17307/wsc.v1i1.255

Numéro

Rubrique

Astronomy and Cosmology