Missionary design of an aperture-synthetic interferometer system to detect an exoplanet in space

How did scientists design the aperture-synthetic interferometer system?

In this project, there is a telescope array system with a collection at the center and four sensors shared around it. Shows how to look in orbit. Available: Space: Science & Technology

The search for another life and the search for the “other world” have always been a subject for mankind and will inspire generations of earth scientists. It will not only improve our understanding of the formation and development of the planets during the formation of a star system but also help scientists to investigate the exact positions and levels of planetary systems. survival. In the last 30 years, scientists have identified more than 4,000 exoplanets, but the search has come a long way.

Due to the extreme distance, the search for exoplanets requires high intelligence and high resolution. The space -based telescope could eliminate the obstruction of Earth’s atmosphere and become the norm for exoplanet exploration. As a next-generation telescope configuration, it is expected that the telescope will be seen in the cross-generation of the telescope system so that an exoplanet like Earth can be seen in close proximity to space. host star like the Sun.

In a research paper published in Space: science & technologyXiangyu Li from Beijing Institute of Technology is launching an exoplanet research mission about space and analyzing his scientific knowledge, mission field, trajectory modeling, and orbital management technology, putting some satellites to create an aperture-synthetic interferometer system in space. help identify exoplanets.

The author has previously mentioned four observational requirements of the telescope array, which are necessary to locate and identify exoplanets that can reside in the neighbors of our solar system (within 65 years). light).

  1. High spatial resolution. The number of star-planets is more than 0.01 arcsec 65 light-years from the Sun.
  2. High quality. The brightness of stars and galaxies varies by at least 7 orders of magnitude in the midinfrared band.
  3. Higher awareness. The Earth’s luminosity in the main power group is less than 3 photons / sec / m2.
  4. Spectral range. Improper observation of the near-infrared group of 1 to 5 μm and direct observation of the near-infrared group of 1 to 13 μm.

Next, the values ​​of the two nulling interferometer and the fourth nulling interferometer were introduced. Due to the nature of the observation requirements and the purpose of the interferometry, the standard requirements for a telescope array system for trajectory design have been eliminated.

Then, the paths were proposed for orbit selection and rotational trajectory design. The Sun-Earth L2 orbit was chosen as a missionary orbit for two main reasons. On the one hand, the ideal missionary orbit must depart from the Earth’s electromagnetic radiation. On the other hand, a clean cleaning environment should reduce the amount and frequency of orbital maintenance. Depending on the selected periodic orbit, the fixed invariant manifolds of the periodic orbits were used to find the lowest conversion time. The transmission trajectory was calculated through a third step. First, due to the limited problem of the third body, the fixed manifolds of the target mission orbit were formed at different angles, and the branch closest to Earth was selected. Second, the Poincare map was chosen as the boundary of the perigee state. Third, the same component that met the maximum limit of the vehicle orbit was selected as the primary predictor of the transmission path. In order to maintain order around the small area, the high drift fault control was imposed and the control rule regarding the tangent search method was intended to increase the recorded time. Between maneuvers.

Finally, statistical comparisons were performed to verify the accuracy of the proposed method. There are two important facts that need to be mentioned. During the orbital rotation, the multiple perigees of the manifold have been found to reduce the rotation time by one and a half years, and each rotation only requires a speed increase of less than 10 m. / to perform the insertion of the halo orbit. . In the process of orbit maintenance, the aircraft is able to meet fixed position limits relative to the frequency of maintenance once every two days instead of, with an increase of the speed of each aircraft is less than 5 × 10.−4 m / s when the error is recorded at 0.1 m.


The eccentric exoplanet was observed


More information:
Feida Jia et al, Mission Design of an Aperture-Synthetic Interferometer System for Detecting the Exoplanet in Space, Space: science & technology (2022). DOI: 10.34133 / 2022 /9835234

Presented by Beijing Institute of Technology

Directions: Missionary design of an aperture-synthetic interferometer system to detect an exoplanet in space (2022, April 8) retrieved 9 April 2022 from https://phys.org/news /2022-04-mission-aperture-synthetic-interferometer-space -based-exoplanet.html

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