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It is possible to learn a great deal about exoplanet atmospheres even when we cannot spatially resolve the planets from their host stars. In this chapter, we overview the basic techniques used to characterize transiting exoplanets -…

Earth and Planetary Astrophysics · Physics 2019-02-06 Laura Kreidberg

This tutorial is an introduction to techniques used to characterize the atmospheres of transiting exoplanets. We intend it to be a useful guide for the undergraduate, graduate student, or postdoctoral scholar who wants to begin research in…

Earth and Planetary Astrophysics · Physics 2018-12-19 Drake Deming , Dana Louie , Holly Sheets

A variety of terrestrial planets with different physical parameters and exotic atmospheres might plausibly exist outside our Solar System, waiting to be detected by the next generation of space-exploration missions. Some of these planets…

With over 1800 planets discovered outside of the Solar System in the past two decades, the field of exoplanetology has broadened our perspective on planetary systems. Research priorities are now moving from planet detection to planet…

Earth and Planetary Astrophysics · Physics 2015-09-07 Julien de Wit

Exoplanet transmission spectra, which measure the absorption of light passing through a planet's atmosphere during transit, are most often assessed globally, resulting in a single spectrum per planetary atmosphere. However, the inherent…

Earth and Planetary Astrophysics · Physics 2022-12-21 David Grant , Hannah R. Wakeford

Although transit spectroscopy is a powerful method for studying the composition, thermal properties and dynamics of exoplanet atmospheres, only a few transiting terrestrial exoplanets will be close enough to allow significant transit…

Earth and Planetary Astrophysics · Physics 2015-05-28 Franck Selsis , Robin Wordsworth , François Forget

The transit method, during which a planet's presence is inferred by measuring the reduction in flux as it passes in front of its parent star, is a highly successful exoplanet detection and characterization technique. During transit, the…

Instrumentation and Methods for Astrophysics · Physics 2026-01-13 Joanna K. Barstow , Hannah R. Wakeford , Sarah L. Casewell , Vatsal Panwar

The best-characterized exoplanets to date are planets on close-in transiting orbits around their host stars. The high level of irradiation and transiting geometry of these objects make them ideal targets for atmospheric investigations.…

Earth and Planetary Astrophysics · Physics 2019-03-25 Diana Dragomir , Eliza Kempton , Jacob Bean , Ian Crossfield , Eric Gaidos , Nikole Lewis , Michael Line , Roxana Lupu , George Zhou

To date, the ability for observers to reveal the composition or thermal structure of an exoplanet's atmosphere has rested on two techniques: high-contrast direct imaging and time-series observations of transiting exoplanets. The former is…

Earth and Planetary Astrophysics · Physics 2020-07-30 Kevin B. Stevenson

Exoplanets are now being discovered in profusion. However, to understand their character requires spectral models and data. These elements of remote sensing can yield temperatures, compositions, and even weather patterns, but only if…

Earth and Planetary Astrophysics · Physics 2015-06-23 Adam Burrows

Spectral retrieval has long been a powerful tool for interpreting planetary remote sensing observations. Flexible, parameterised, agnostic models are coupled with inversion algorithms in order to infer atmospheric properties directly from…

Earth and Planetary Astrophysics · Physics 2020-07-08 Joanna K. Barstow , Kevin Heng

The review aims to give an overview of atmospheric escape processes from exoplanets. I briefly discuss the physics of various escape processes responsible for atmospheric escape across different types of exoplanets. Transmission…

Earth and Planetary Astrophysics · Physics 2025-02-26 Gopal Hazra

Detailed characterization of an extrasolar planet's atmosphere provides the best hope for distinguishing the makeup of its outer layers, and the only hope for understanding the interplay between initial composition, chemistry, dynamics &…

Earth and Planetary Astrophysics · Physics 2016-03-09 Ian J. M. Crossfield

The majority of exoplanets found to date have been discovered via the transit method, and transmission spectroscopy represents the primary method of studying these distant worlds. Currently, in-depth atmospheric characterization of…

Transmission spectroscopy during planetary transits is expected to be a major source of information on the atmospheres of small (approximately Earth-sized) exoplanets in the next two decades. This technique, however, is intrinsically…

Observations of stellar surfaces - except for the Sun - are hampered by their tiny angular extent, while observed spectral lines are smeared by averaging over the stellar surface, and by stellar rotation. Exoplanet transits can be used to…

Solar and Stellar Astrophysics · Physics 2016-12-07 Dainis Dravins , Hans-Günter Ludwig , Erik Dahlén , Hiva Pazira

We propose a method for observing transiting exoplanets with near-infrared high-resolution spectrometers. We aim to create a robust data analysis method for recovering atmospheric transmission spectra from transiting exoplanets over a wide…

Instrumentation and Methods for Astrophysics · Physics 2015-06-17 Erik Aronson , Pierre Waldén , Nikolai Piskunov

Transmission spectroscopy is a key technique in the characterization of exoplanet atmospheres and has been widely applied to planets undergoing hydrodynamic escape. While a robust analytic theory exists for transmission spectra of…

Earth and Planetary Astrophysics · Physics 2026-04-09 Leonardos Gkouvelis

The field of exoplanets is quickly expanding from just the detection of new planets and the measurement of their most basic parameters, such as mass, radius and orbital configuration, to the first measurements of their atmospheric…

Earth and Planetary Astrophysics · Physics 2010-12-15 Mercedes Lopez-Morales

Understanding a planet's atmosphere is a necessary condition for understanding not only the planet itself, but also its formation, structure, evolution, and habitability, This puts a premium on obtaining spectra, and developing credible…

Earth and Planetary Astrophysics · Physics 2015-06-18 Adam Burrows
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