Performance and limitations of using ELT and MCAO for 50 μas astrometry

Rodeghiero, Gabriele; Arcidiacono, Carmelo; Pott, Jörg‐Uwe; Perera, Saavidra; Pariani, Giorgio; Magrin, Demetrio; Riechert, Hannes; Glück, Martin; Gendron, É.; Massari, D.; Sauter, Jonas; Fabricius, Maximilian; Häberle, Maximilian; Meßlinger, Sebastian; Davies, R. I.; Ciliegi, P.; Lombini, Matteo; Schreiber, Laura

doi:10.1117/1.jatis.7.3.035005

Cited by 5 publications

(5 citation statements)

References 47 publications

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“…More measurements will be done with current telescopes, like James Webb Space Telescope [63] and Very Large Telescope Interferometer [64], as well as by future telescopes, such as China Space Station Telescope [65], European Extremely Large Telescope [66], Thirty Meter Telescope [67], Giant Magellan Telescope [68], and Legacy Survey of Space and Time [69], in the outer MW region with r ∼ 100-200 kpc. It can be expected that better and more data can be obtained by these telescopes, and the accuracy of measurements will be improved significantly in the near future.…”

Section: Resultsmentioning

confidence: 99%

Dark energy on astrophysical scales and its detection in the Milky Way

Zhang,

Zhang

2023

J. Cosmol. Astropart. Phys.

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The origin and nature of dark energy is one of the most significant challenges in modern science. This research aims to investigate dark energy on astrophysical scales and provide a cosmology-independent method to measure its equation-of-state parameter w. To accomplish this, we introduce the concept of a perfect fluid in any static, curved spacetime, and express the energy-momentum tensor of the perfect fluid in a general isotropic form, namely Weinberg's isotropic form. This enables us to define an equation-of-state parameter in a physical and global manner. Within this theoretical framework, we demonstrate that the energy-momentum tensor of dark energy on different scales can take the general isotropic form. Furthermore, we explore the SdS w spacetime and establish its connection with dark energy in cosmology through the equation-of-state parameter w. In the SdS w spacetime, a repulsive dark force can be induced by dark energy locally. We then apply the concept of the dark force to realistic astrophysical systems using the Poisson equation. Finally, we find that an anomaly in the Milky Way rotation curve can be quantitatively interpreted by the dark force. By fitting the galactic curve, we are able to obtain the value of the equation-of-state parameter of dark energy, independently of specific dark energy models.

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Section: Resultsmentioning

confidence: 99%

Dark energy on astrophysical scales and its detection in the Milky Way

Zhang,

Zhang

2023

J. Cosmol. Astropart. Phys.

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show abstract

“…More measurements will be done with current telescopes, like James Webb Space Telescope [45] and Very Large Telescope Interferometer [46], as well as by future telescopes, such as European Extremely Large Telescope [47], Thirty Meter Telescope [48], Giant Magellan Telescope [49], and Legacy Survey of Space and Time [50], in the outer MW region with r ∼ 100 − 200 kpc. It can be expected that better data and more data can be obtained by these telescopes, and the accuracy of measurements will be improved significantly in the near future.…”

Section: Resultsmentioning

confidence: 99%

The development of geophysics in the early period of the People's Republic of China based on the Institute of Geophysics, Chinese Academy of Sciences (1950–1966)

Zhang

Wang

2021

Hist. Geo Space. Sci.

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Abstract. From the perspective of the social history of science and transnational history, this paper reviewed the development of the Institute of Geophysics, Chinese Academy of Sciences (IGCAS), rather than focusing on its scientific achievements. Before the 1950s, the discipline of geophysics in China, except for the branch of meteorology, had a very weak foundation, and few researchers were engaged in it. The systematic development of geophysics began with the establishment of IGCAS. In this paper, the early development of IGCAS was researched thoroughly. At first, we briefly reviewed the establishment process for IGCAS. After being promoted by the desire of scientists to develop big geophysics, the Chinese Academy of Sciences (CAS) integrated scattered academic forces, which included geomagnetism and geophysical exploration, to establish the IGCAS. The IGCAS was based on the Institute of Meteorology of Academia Sinica in the Republic of China era. After that, we summarized work done by IGCAS in the development of geophysics from the 1950s to 1966, the year in which the Cultural Revolution began. We focused on policy support, adjustment of organizational structure, and scientific capacity building, when China was facing an isolated international diplomatic environment, continuous domestic political movements, and an austere social economy. Then, to bolster the development of geophysics in China, the slogan of “Missions Drive Disciplines”, which was instilled and implemented by the Chinese scientific community, was introduced briefly. The scientific development of the IGCAS and typical examples in several branches of geophysics, which included atmospheric science, seismology, space physics, and other fields, were systematically summarized and benchmarked to the international academic level. We then summarized the basic research on geophysics carried out by the institute in economic construction and national defense. Finally, the experience and lessons in the development of this institute and its effect on geophysics in China were explored.

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“…In that case, the mathematical framework works out precisely as for the PSF, so long as the timescale on which the telescope pointing is affected by inaccuracies is significantly lower than the total time of the exposure, such that photons can be assumed to be independently affected. In the case of the ELT, the uncompensatable random errors vary on subsecond timescales (Rodeghiero et al 2021), such that we deem this a reasonable assumption. METIS will achieve fine-guiding accuracies below 0.02λ/D (Brandl et al 2021), which translates to a worst-case pointing offset below σ PO ≈ 1 mas, such that we can expect the pointing inaccuracy σ p to be at the very greatest…”

Section: Pointing Noisementioning

confidence: 94%

The spectroastrometric detectability of nearby Solar System-like exomoons

van Woerkom,

Kleisioti

2024

A&A

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Though efforts to detect them have been made with a variety of methods, no technique can claim a successful, confirmed detection of a moon outside the Solar System yet. Moon detection methods are restricted in capability to detecting moons of masses beyond what formation models would suggest, or they require surface temperatures exceeding what tidal heating simulations allow. We expand upon spectroastrometry, a method that makes use of the variation of the centre of light with wavelength as the result of an unresolved companion, which has previously been shown to be capable of detecting Earth-analogue moons around nearby exo-Jupiters, with the aim to place bounds on the types of moons detectable using this method. We derived a general, analytic expression for the spectroastrometric signal of a moon in any closed Keplerian orbit, as well as a new set of estimates on the noise due to photon noise, pointing inaccuracies, background and instrument noise, and a pixelated detector. This framework was consequently used to derive bounds on the temperature required for Solar System-like moons to be observable around super-Jupiters in nearby systems, with epsilon Indi Ab as an archetype. We show that such a detection is possible with the ELT for Solar System-like moons of moderate temperatures (150-300 K) in line with existing literature on tidal heating, and that the detection of large (Mars-sized or greater) icy moons of temperatures such as those observed in our Solar System in the very nearest systems may be feasible.

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Performance and limitations of using ELT and MCAO for 50 μas astrometry

Cited by 5 publications

References 47 publications

Dark energy on astrophysical scales and its detection in the Milky Way

Dark energy on astrophysical scales and its detection in the Milky Way

The development of geophysics in the early period of the People's Republic of China based on the Institute of Geophysics, Chinese Academy of Sciences (1950–1966)

The spectroastrometric detectability of nearby Solar System-like exomoons

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