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Direct imaging of extra-solar planets has now become a reality, especially with the deployment and commissioning of the first generation of specialized ground-based instruments such as the GPI, SPHERE, P1640 and SCExAO. These systems will…

Instrumentation and Methods for Astrophysics · Physics 2015-06-22 Sandrine J. Thomas , Ruslan Belikov , Eduardo Bendek

Detecting the faint emission of a secondary source in the proximity of the much brighter source has been the most severe obstacle for using direct imaging in searching for exoplanets. Using quantum state discrimination and quantum imaging…

Quantum Physics · Physics 2021-09-29 Zixin Huang , Cosmo Lupo

A space telescope capable of high-contrast imaging has been recognized as the avenue toward finding terrestrial planets around nearby Sun-like stars and characterizing their potential habitability. It is thus essential to quantify the…

Earth and Planetary Astrophysics · Physics 2022-06-01 Mario Damiano , Renyu Hu

Future space telescopes may be able to directly image $\sim$10 - 100 planets with sizes and orbits consistent with habitable surface conditions ("exo-Earth candidates" or EECs), but observers will face difficulty in distinguishing these…

Earth and Planetary Astrophysics · Physics 2020-02-27 Alex Bixel , Dániel Apai

We propose a method to detect exoplanets based on their host star's intensity centroid after it passes thru a vortex filter. Based on our calculations with planets in face-on orbits, exoplanets with relative proximity to their host stars…

Instrumentation and Methods for Astrophysics · Physics 2025-03-21 Niña Zambale Simon , Miguel Revilla , Nathaniel Hermosa

High-contrast imaging (HCI) is one of the most challenging techniques for exoplanet detection. It relies on sophisticated data processing to reach high contrasts at small angular separations. Most data processing techniques of this type are…

Instrumentation and Methods for Astrophysics · Physics 2021-02-10 Carl-Henrik Dahlqvist , Olivier Absil

The detection of exoplanets through direct imaging has produced numerous new positive identifications in recent years. The technique is biased towards planets at wide separations due to the difficulty in removing the stellar signature at…

Earth and Planetary Astrophysics · Physics 2015-06-12 Stephen R. Kane

Further advances in exoplanet detection and characterisation require sampling a diverse population of extrasolar planets. One technique to detect these distant worlds is through the direct detection of their thermal emission. The so-called…

We propose the application of coronagraphic techniques to the spectroscopic direct detection of exoplanets via the Doppler shift of planetary molecular lines. Even for an unresolved close-in planetary system, we show that the combination of…

Earth and Planetary Astrophysics · Physics 2014-06-05 Hajime Kawahara , Naoshi Murakami , Taro Matsuo , Takayuki Kotani

We investigate directly imaging exoplanets around eclipsing binaries, using the eclipse as a natural tool for dimming the binary and thus increasing the planet to star brightness contrast. At eclipse, the binary becomes point-like, making…

Earth and Planetary Astrophysics · Physics 2020-09-02 Stefano Bellotti , Ann Zabludoff , Ruslan Belikov , Olivier Guyon , Chirag Rathi

At optical wavelengths, an exoplanet's signature is essentially reflected light from the host star - several orders of magnitude fainter. Since it is superimposed on the star spectrum its detection has been a difficult observational…

Earth and Planetary Astrophysics · Physics 2013-10-07 Jorge H. C. Martins , Pedro Figueira , Nuno Santos , Christophe Lovis

Exoplanet research is essential for understanding planetary formation and the potential for life beyond our solar system. The direct imaging method captures exoplanet light while minimizing light from the host star. This is conventionally…

Instrumentation and Methods for Astrophysics · Physics 2025-12-02 Suvinay Goyal , Yinzi Xin , Nemanja Jovanovic , Dimitri Mawet , Michael P. Fitzgerald

Direct imaging of extra-solar planets is now a reality, especially with the deployment and commissioning of the first generation of specialized ground-based instruments such as the Gemini Planet Imager and SPHERE. These systems will allow…

Instrumentation and Methods for Astrophysics · Physics 2016-01-20 Sandrine J. Thomas , Ruslan Belikov , Eduardo Bendek

Effective image post-processing algorithms are vital for the successful direct imaging of exoplanets. Standard PSF subtraction methods use techniques based on a low-rank approximation to separate the rotating planet signal from the…

Instrumentation and Methods for Astrophysics · Physics 2024-12-11 Hazan Daglayan , Simon Vary , Olivier Absil , Faustine Cantalloube , Valentin Christiaens , Nicolas Gillis , Laurent Jacques , Valentin Leplat , P. -A. Absil

One of the top remaining science challenges in astronomical optics is the direct imaging and characterization of extrasolar planets and planetary systems. Directly imaging exoplanets from ground-based observatories requires combining…

Instrumentation and Methods for Astrophysics · Physics 2021-10-04 Alexander T Rodack , Richard A Frazin , Jared R Males , Olivier Guyon

Exoplanet imaging is a major challenge in astrophysics due to the need for high angular resolution and high contrast. We present a multi-scale statistical model for the nuisance component corrupting multivariate image series at high…

Instrumentation and Methods for Astrophysics · Physics 2025-09-25 Théo Bodrito , Olivier Flasseur , Julien Mairal , Jean Ponce , Maud Langlois , Anne-Marie Lagrange

Context. High-contrast exoplanet imaging is a rapidly growing field as can be seen through the significant resources invested. In fact, the detection and characterization of exoplanets through direct imaging is featured at all major…

Instrumentation and Methods for Astrophysics · Physics 2018-04-17 Markus J. Bonse , Sascha P. Quanz , Adam Amara

The detection of exoplanets with the radial velocity method consists in detecting variations of the stellar velocity caused by an unseen sub-stellar companion. Instrumental errors, irregular time sampling, and different noise sources…

Earth and Planetary Astrophysics · Physics 2023-09-06 L. A. Nieto , R. F. Díaz

The high contrast and spatial resolution requirements for directly imaging exoplanets requires effective coordination of wavefront control, coronagraphy, observation techniques, and post-processing algorithms. However, even with this suite…

Direct imaging and spectroscopy is the likely means by which we will someday identify, confirm, and characterize an Earth-like planet around a nearby Sun-like star. This Chapter summarizes the current state of knowledge regarding…

Earth and Planetary Astrophysics · Physics 2023-07-28 Thayne Currie , Beth Biller , Anne-Marie Lagrange , Christian Marois , Olivier Guyon , Eric Nielsen , Mickael Bonnefoy , Robert De Rosa