References of "Loicq, Jerôme"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailExoplanet detection yield of a space-based Bracewell interferometer from small to medium satellites
Dandumont, Colin ULiege; Defrere, Denis ULiege; Kammerer, Jens et al

in Journal of Astronomical Telescopes, Instruments, and Systems (2020), 6(3),

Space-based nulling interferometry is one of the most promising solutions to spectrally characterize the atmosphere of rocky exoplanets in the mid-infrared (3 to 20  μm). It provides both high angular ... [more ▼]

Space-based nulling interferometry is one of the most promising solutions to spectrally characterize the atmosphere of rocky exoplanets in the mid-infrared (3 to 20  μm). It provides both high angular resolution and starlight mitigation. This observing capability depends on several technologies. A CubeSat (up to 20 kg) or a medium satellite (up to a few hundreds of kg), using a Bracewell architecture on a single spacecraft could be an adequate technological precursor to a larger, flagship mission. Beyond technical challenges, the scientific return of such a small-scale mission needs to be assessed. We explore the exoplanet science cases for various missions (several satellite configurations and sizes). Based on physical parameters (diameter and wavelength) and thanks to a state-of-the-art planet population synthesis tool, the performance and the possible exoplanet detection yield of these configurations are presented. Without considering platform stability constraints, a CubeSat (baseline of b  ≃  1  m and pupils diameter of D  ≃  0.1  m) could detect ≃7 Jovian exoplanets, a small satellite (b  ≃  5  m  /  D  ≃  0.25  m) ≃120 exoplanets, whereas a medium satellite (b  ≃  12.5  m  /  D  ≃  0.5  m) could detect ∼250 exoplanets including 51 rocky planets within 20 pc. To complete our study, an analysis of the platform stability constraints (tip/tilt and optical path difference) is performed. Exoplanet studies impose very stringent requirements on both tip/tilt and OPD control. [less ▲]

Detailed reference viewed: 126 (44 ULiège)
Full Text
See detailBenefits of photonic structuring on perovskite solar cells using opal-like layers
Lobet, Michaël ULiege; Mayer, Alexandre; Maho, Anthony ULiege et al

Poster (2020, August 26)

Detailed reference viewed: 30 (1 ULiège)
Full Text
Peer Reviewed
See detailSolution uniqueness and noise impact in a static spectropolarimeter based on birefringent prisms for full Stokes parameter retrieval
Vasilescu, Bogdan ULiege; Loicq, Jerôme ULiege; Nazé, Yaël ULiege

in Journal of Astronomical Telescopes, Instruments, and Systems (2020), 6(2),

An innovative model of a static spectropolarimeter able to cover the entire Stokes vector is discussed. The optical layout is based on a birefringent modulator formed by two antiparallel prisms stuck ... [more ▼]

An innovative model of a static spectropolarimeter able to cover the entire Stokes vector is discussed. The optical layout is based on a birefringent modulator formed by two antiparallel prisms stuck together with the help of an intermediary part of the same material. This optical model has the advantage of being extremely compact. It avoids any movable parts or rotating components. By its architecture, the device induces a complete modulation on the vertical direction of any incoming polarized light, facilitating the determination of the entire Stokes vector through a single measurement. Because the modulation is also wavelength-dependent, spectral dependencies of the polarization states can be derived. The behavior of the model was first investigated in noise-free conditions. The existence of a unique solution was proven in the absence of noise and for any Stokes vector configuration. Under noisy conditions, the uncertainty on the Stokes parameters and the efficiency of the modulation scheme were evaluated as a function of the analyzer’s angle and for two different configurations of the modulator. The simulations show that an almost ideal efficiency is reachable, qualifying the concept for the high-precision measurement of the polarization. [less ▲]

Detailed reference viewed: 70 (18 ULiège)
Full Text
Peer Reviewed
See detailOpal-Like Photonic Structuring of Perovskite Solar Cells Using a Genetic Algorithm Approach
Lobet, Michaël ULiege; Mayer, Alexandre; Maho, Anthony ULiege et al

in Applied Sciences (2020)

Light management is an important area of photovoltaic research, but little is known about it in perovskite solar cells. The present work numerically studies the positive effect of structuring the photo ... [more ▼]

Light management is an important area of photovoltaic research, but little is known about it in perovskite solar cells. The present work numerically studies the positive effect of structuring the photo-active layer of perovskite material. This structuration consists of a hybrid absorbing layer made of an uniform part and an opal-like part. A genetic algorithm approach allows us to determine the optimal combination among more than 1.4 􀵈 10􀬽 potential combinations. The optimal combination provides an internal quantum efficiency of 98.1%, nearly 2% higher than for an equivalent unstructured photo-active layer. The robustness of the optimum against potential experimental deviations, as well as the angular dependency of the proposed structure, are examined in the present study. [less ▲]

Detailed reference viewed: 47 (8 ULiège)
Full Text
See detailTechnological challenges for the Large Interferometer For Exoplanets (LIFE)
Defrere, Denis ULiege; Quanz, Sascha; Absil, Olivier ULiege et al

Scientific conference (2019, November 04)

LIFE is a project initiated in 2017 and officially kicked-off in 2019 to develop the science, technology and a roadmap for an ambitious space mission that will allow mankind for the first time to detect ... [more ▼]

LIFE is a project initiated in 2017 and officially kicked-off in 2019 to develop the science, technology and a roadmap for an ambitious space mission that will allow mankind for the first time to detect and characterize the atmospheres of dozens of warm, terrestrial extrasolar planets. Thanks to NASA's Kepler mission and dedicated, long-term exoplanet searches from the ground, we know that rocky exoplanets are ubiquitous in the Milky Way and very likely also in the immediate Solar neighbourhood. Detecting these nearest planets, understanding the (atmospheric) diversity of other worlds and searching for indications of habitability and biological activity is a cornerstone of 21st century astrophysics and will provide us a new perspective on our place in this Universe. After a brief introduction on the scientific objectives, we present in this talk the recent technology developments required for LIFE and present the main technological challenges to tackle before launching such a mission. [less ▲]

Detailed reference viewed: 67 (8 ULiège)
Full Text
See detailTRIUMF: Trifocal & EDOF
Gatinel, Damien; Pagnoulle, Christophe; Loicq, Jerôme ULiege

Conference (2019, September 13)

Developement of a new multifocal intra-occular lens chromatically corrected.

Detailed reference viewed: 21 (3 ULiège)
Full Text
See detailUsing a cubesat to improve irrigation: an innovative thermal imager
Laborde, Victor ULiege; Loicq, Jerôme ULiege; Habraken, Serge ULiege et al

Conference (2019, September 11)

Water management has become one of the most important issues since 70% of the fresh water available on Earth is used for irrigation. The growing food demand and the scarcity of water resources lead to the ... [more ▼]

Water management has become one of the most important issues since 70% of the fresh water available on Earth is used for irrigation. The growing food demand and the scarcity of water resources lead to the need to carefully monitor water use, considering agricultural fields of thousands of km². The intrinsic hydric stress of crops is an indicator of their water needs. Better water management and crops healthiness could be achieved if this stress could be measured quickly. Hydric stress can be retrieve by comparing the ground temperature (reference) and the leaf surface temperature (LST) which also depends on the transpiration ability of the plant. Yet, this measure is very unpractical without airborne/spaceborn sensors with good resolution. This finding has led to the birth of the OUFTI-NEXT mission. The recent advances in the field of nanosatellites and the rising attention they get from the space agencies have convinced the University of Liege to develop its own CubeSat mission to image the LST with thermal infrared light above extensive crops to provide data for irrigation schedule. The aim of the long term mission will be to fly a constellation of CubeSats to ensure daily coverage over various fields with resolution of 50m. In addition, hot singular events data can be retrieved such as forest fire, volcanoes activity, pollutant leaking, etc… Each CubeSat is a dual-band imager in both the middle wave infrared (MWIR) and the long wave infrared (LWIR). The scientific value of combining these bands is huge since LWIR gives accurate temperature measurements around 300K but with bad contrast, the latter being compensated by the MWIR which allows fine resolution. Each band is also sensitive to different atmosphere condition (humidity, clouds) and using both brings robustness to the mission. The current step of this ambitious project is to fly a single band 3U technology demonstrator to validate the use of MWIR technologies without space heritage and the scientific value of MWIR images for LST determination. This spectral band is very challenging, as it hardly allows diffraction-limited performances: it requires fast optics, more sensitive to aberrations. For this demonstrator, resolution of 100m without daily coverage is chosen, resulting from is a trade-off between science demonstration and mission size. The “new” infrared technologies include: high operating temperature detector, compact optics, passive athermalization and recent infrared materials. Solutions to make this challenging mission feasible are promising: The MWIR camera achieved diffraction-limited performances and uses compact hybrid lenses made of chalcogenide materials to reduce thermals effects and manufacturing costs. A very wide range of suitable detectors have been reviewed and the possibility to customize their integration is studied with their manufacturers. The orbit is sun-synchronous to optimize the thermal design and in accordance with both the radiometric budget and the observation strategy. [less ▲]

Detailed reference viewed: 64 (4 ULiège)
Full Text
See detailFeasibility study of an interferometric CubeSat for exoplanet science
Dandumont, Colin ULiege; Loicq, Jerôme ULiege; Defrere, Denis ULiege et al

Conference (2019, September 11)

Every week, new exoplanets are discovered mostly by the transit method (77.1% of all discoveries according to NASA). Even if this method is efficient at detecting planets, it is limited to a small ... [more ▼]

Every week, new exoplanets are discovered mostly by the transit method (77.1% of all discoveries according to NASA). Even if this method is efficient at detecting planets, it is limited to a small fraction of the whole expected exoplanets population due to the low probability of planetary transit. Therefore, a direct method is needed to detect and characterize exoplanets around the nearest stars. In this case, the planet and the star are angularly separated and photons are distinguished. It leads to the detection of the planet. Moreover, it allows the possible characterization of the planet surface or its atmosphere. One way to detect them through direct method is to use interferometry. With at least two sub-pupils (Bracewell interferometer), coherent light from the target is recombined to form interference patterns. The angular resolution depends on the baseline (distance between the two sub-pupils) and not on the diameter of each sub-pupil. Instead of using a single large telescope (around 60 cm diameter), which does not fit into a CubeSat, one can use two small and well separated apertures (around 10 cm each) to synthesize this large telescope. Therefore, it increases drastically the resolution power of CubeSats. In order to detect an exoplanet and get the direct light coming from it, the light from the star must be mitigated. It is called nulling interferometry. Thanks to a pi phase shift induced in one arm of the interferometer, destructive interferences are produced on the line-of-sight in order to suppress the light of the star. The exoplanet, which is on constructive interferences (white fringes), is unveiled. The Centre Spatial de Liège of the University is developing a space-based interferometer with a CubeSat. Goals are twofold: observe the nearest stars and demonstrate this technology in space, which will be a premiere. It is the first step towards a future large interferometry space-based mission which has the ambition to spectrally characterize Earth-like planets. The CubeSat will demonstrate light injection to optical fibers, recombination of the two beams, control of the delay-lines and detection. CubeSats offer low-cost demonstrator capabilities with a fixed baseline and with no free-flying concept. Aside the technical challenges, the second part of our researches is focused on the detection possibilities with this type of nanosatellite. We estimate by numerical simulations the possible science return for such an instrument. [less ▲]

Detailed reference viewed: 134 (22 ULiège)
Full Text
See detailAtmospheric characterization of terrestrial exoplanets in the mid-infared: biosignatures, habitability & diversity
Quanz, Sascha P.; Absil, Olivier ULiege; Angerhausen, Daniel et al

E-print/Working paper (2019)

Exoplanet science is one of the most thriving fields of modern astrophysics. A major goal is the atmospheric characterization of dozens of small, terrestrial exoplanets in order to search for signatures ... [more ▼]

Exoplanet science is one of the most thriving fields of modern astrophysics. A major goal is the atmospheric characterization of dozens of small, terrestrial exoplanets in order to search for signatures in their atmospheres that indicate biological activity, assess their ability to provide conditions for life as we know it, and investigate their expected atmospheric diversity. None of the currently adopted projects or missions, from ground or in space, can address these goals. In this White Paper we argue that a large space-based mission designed to detect and investigate thermal emission spectra of terrestrial exoplanets in the MIR wavelength range provides unique scientific potential to address these goals and surpasses the capabilities of other approaches. While NASA might be focusing on large missions that aim to detect terrestrial planets in reflected light, ESA has the opportunity to take leadership and spearhead the development of a large MIR exoplanet mission within the scope of the "Voyage 2050'' long-term plan establishing Europe at the forefront of exoplanet science for decades to come. Given the ambitious science goals of such a mission, additional international partners might be interested in participating and contributing to a roadmap that, in the long run, leads to a successful implementation. A new, dedicated development program funded by ESA to help reduce development and implementation cost and further push some of the required key technologies would be a first important step in this direction. Ultimately, a large MIR exoplanet imaging mission will be needed to help answer one of mankind's most fundamental questions: "How unique is our Earth?'' [less ▲]

Detailed reference viewed: 47 (13 ULiège)
Full Text
See detailDevelopment of a space-based nulling interferometer to detect and characterize exoplanets
Schifano, Luca; Defrere, Denis ULiege; Absil, Olivier ULiege et al

in Proceedings of SPIE: The International Society for Optical Engineering (2019, July 12)

The development of small space-based platforms for nulling interferometric observations could be the pathfinder of a new era in exoplanetology. While planetary transit and radial velocity are the most ... [more ▼]

The development of small space-based platforms for nulling interferometric observations could be the pathfinder of a new era in exoplanetology. While planetary transit and radial velocity are the most productive ways to detect exoplanets, such techniques are indirect detections. For deeper characterization of exoplanets, direct detection techniques should be developed. By injecting direct light coming from exoplanets into spectrometers, we could study their chemical composition, search for biosignatures, and possibly infer the presence of life. The low number of photons to be gathered from the planets, high contrast with the star and small angular resolution are the major difficulties for a direct detection. However, nulling interferometry seems to be a solution to tackle these challenges. By combining the light of two or more telescopes, we would considerably increase the angular resolution, and thus could potentially lead to the detection of Earth-size rocky exoplanets around Solar-type stars. Moreover, with a π- phase shift between the two interferometer arms, the starlight is reduced which allows the detection of much fainter objects around the star. In this paper it will be presented the development of a new mission based on nulling interferometry and dedicated to the Alpha Centauri system. As our nearest stellar system, it is a prime target to investigate for the research of new worlds. Monte-Carlo simulations about potential exoplanet yield of such an interferometer will be described, for different assumptions such as the detection wavelength and telescope size. Single-mode fibers and integrated optics will also be investigated for this mission. This could lead to low-cost type missions with a high potential of scientific return. [less ▲]

Detailed reference viewed: 49 (7 ULiège)
Full Text
Peer Reviewed
See detailDevelopment of VUV multilayer coatings for SMILE-UVI instrument
Loicq, Jerôme ULiege; Fleury-Frenette, Karl ULiege; Blain, Pascal ULiege et al

in International Conference on Space Optics — ICSO 2018 (2019, July 12)

he Ultraviolet Imager (UVI) instrument is a very challenging imager developed in the frame of the SMILE-ESA mission. The UV camera will consist of a single imaging system targeted at a portion of the ... [more ▼]

he Ultraviolet Imager (UVI) instrument is a very challenging imager developed in the frame of the SMILE-ESA mission. The UV camera will consist of a single imaging system targeted at a portion of the Lyman-Birge-Hopfield (LBH) N2 wavelength band. The baseline design of the imager meets the requirements to record snapshots of auroral dynamics with sufficient spatial resolution to measure cusp processes (100 km) under fully sunlit conditions from the specified apogee of the spacecraft. To achieve this goal, the UVI instrument utilizes a combination of four on-axis mirrors with an intensified FUV CMOS based camera. The mirrors will be coated with spectral selective interferometric layers to provide most of the signal filtering. The objective of these filters is to select the scientific waveband between 160 and 180 nm. The combined four mirrors have to give an out-of-band rejection ratio as high as possible to reject light from solar diffusion, dayglow and unwanted atomic lines in a range of 10-8 – 10-9. Different multilayer coatings are considered and optimized according to the π- multilayer equation for different H/L ratio and for different angles of incidence. Our theoretical evaluation shows a least a modification of the reflectance spectrum as a function of the angle of incidence, so that the optical beams hitting the different mirrors can have different optical properties depending on the optical fields and the distribution of the rays on the pupil. In this paper the effect of fields and coating homogeneity on the spectral throughput of the UVI instrument will be assessed and described. [less ▲]

Detailed reference viewed: 30 (8 ULiège)
Full Text
Peer Reviewed
See detailTopography and Longitudinal Chromatic Aberration characterizations of Refractive-Diffractive Multifocal IOLs
Loicq, Jerôme ULiege; Willet, Nicolas ULiege; Gatinel, Damien

in Journal of Cataract and Refractive Surgery (2019)

Purpose Most optical systems present chromatic aberration quantified along the optical axis by the longitudinal chromatic aberration (LCA). LCA is controlled by the biomaterial Abbe number combined with ... [more ▼]

Purpose Most optical systems present chromatic aberration quantified along the optical axis by the longitudinal chromatic aberration (LCA). LCA is controlled by the biomaterial Abbe number combined with diffractive effects, driven by the IOL topography. This paper experimentally aims at describing in vitro the effect of LCA in diffractive multifocal IOLs, with the help of dedicated optical benches and topographic characterization. Setting Centre Spatial de Liege. Design Optical and topology analysis of various Multifocal diffractive intraocular lenses. Methods Seven diffractive multifocal lenses, available on the market and exhibiting different diffractive profiles, made from various biomaterials, were characterized under different wavelengths. Results Through-focus Modulation Transfer Function (MTF) curves and IOL diffraction efficiency depends on the incident light wavelength. In this paper, we investigated the topology properties of various Multifocal intraocular lenses and correlated their characteristics to their optical behavior for various wavelengths. Chromatic properties and their origins were then compared. As expected, diffractive and refractive effects were found to act in opposite ways, and could be partially or completely compensated. Conclusions The longitudinal chromatic aberration of each of the lenses was evaluated in vitro. In most of the MIOLs studied, some of the foci were found to be refractive, while others were diffractive. Although the results were not extrapolated to clinical relevance , it was shown, in some of the cases, that LCA could be fully compensated. [less ▲]

Detailed reference viewed: 36 (22 ULiège)
See detailPhotonic management using opal-like crystals in perovskite solar cells
Lobet, Michaël ULiege; Piron, Pierre ULiege; Dewalque, Jennifer ULiege et al

Conference (2019, May 22)

Perovskite solar cells recently showed a tremendous interest among the photovoltaic community. However, little is known on the effect of light management inside PV architectures. We compare structured and ... [more ▼]

Perovskite solar cells recently showed a tremendous interest among the photovoltaic community. However, little is known on the effect of light management inside PV architectures. We compare structured and unstructured absorbing layers in order to enhance the integrated quantum efficiency. The photo-active layer is made of monolayer, bilayer or trilayer of perovskite spheres inside a TiO2 matrix. The excitation of guided resonances via Fano resonances inside the absorbing spheres enhances the integrated quantum efficiency and enables a photonic gain as high as 6.4%. Influence of sphere's radius, incident angle and incident polarization on the absorbing properties are also reported. [less ▲]

Detailed reference viewed: 82 (12 ULiège)
Full Text
See detailOpal-like CH3NH3PbI3 perovskite solar cells : effect of the 3D structuration on the conversion efficiency
Dewalque, Jennifer ULiege; Daem, Nathan ULiege; Spronck, Gilles ULiege et al

Poster (2019, May 13)

In this work, the 3D structuration of perovskite films is studied in order to highlight the effect of a periodic porous structure on the optical properties of the films (light harvesting, optical ... [more ▼]

In this work, the 3D structuration of perovskite films is studied in order to highlight the effect of a periodic porous structure on the optical properties of the films (light harvesting, optical coloration, semi-transparency…) and on the PV efficiency, in comparison with dense perovskite films usually used in planar solar cells configuration. The opal-like perovskite scaffold is obtained from templating fabrication method, with polystyrene beads as structuring agent. Five PS bead diameters are studied: 300 nm, 540 nm, 810 nm, 1.0 µm and 2.1 µm, to highlight the effect of the PS bead diameter on the optical properties of the films and on the PV efficiency. PbI2/CH3NH3I 0.7M in DMSO leads to the most covering, homogeneous and overlayer-free porous films. The PV efficiency of the corresponding cells increases with the bead diameter. A significant improvement in the PV conversion efficiency is observed thanks to the 3D structuration compared to a dense reference, due to the improvement of charge separation at the Spiro-OMeTAD/perovskite interface and thus to the reduction of charge recombination. In addition, CH3NH3PbI3 porous films prepared with 810 nm, 1000 nm and 2100 nm PS bead diameter respectively, are coloured, which is very interesting for building-integrated applications (BIPV). [less ▲]

Detailed reference viewed: 94 (17 ULiège)
Full Text
See detailICON mission and SMILE mission: From optical design to vacuum calibration, and launch
Loicq, Jerôme ULiege

Scientific conference (2019, February)

Presentation of Uliege activities on SMILE (ESA) and ICON (Nasa) missions

Detailed reference viewed: 18 (2 ULiège)
Full Text
See detailSMILE-UVI: Development of VUV multilayer coatings.
Loicq, Jerôme ULiege

Scientific conference (2018, October 30)

Presentation of the status of the UV coating development in the frame of the SMILE Mission

Detailed reference viewed: 7 (1 ULiège)
Full Text
See detailLCA discussion on diffractive intraocular lenses: a new optical design to correct chromatic aberration
Loicq, Jerôme ULiege; Willet, Nicolas ULiege; Gatinel, Damien

in Biometry and quality of Vision (2018, September 25)

Methods: The effects of Abbe number and the topography of different diffractive IOL profiles were evaluated. On the basis of MTF through-focus curves at different light wavelengths (red, blue and green ... [more ▼]

Methods: The effects of Abbe number and the topography of different diffractive IOL profiles were evaluated. On the basis of MTF through-focus curves at different light wavelengths (red, blue and green) and for different pupil apertures, polychromatic behavior of various diffractive multifocal IOLs was assessed. Pin-hole effect will also be discussed and addressed with the point of view of chromatic effect. Results: Diffractive multifocal IOLs show chromatic aberration especially along the axis (LCA-longitudinal Chromatic aberration) but also out of the optical axis. These chromatic aberrations are the results of the refractive chromatic properties of the lens, driven by the biomaterial refractive indexes and the IOL diffractive pattern. Refractive effects are mainly controlled by the biomaterial Abbe number while diffractive effects are controlled by the topography of the diffractive pattern. Conclusions: Refractive effects are mainly controlled by biomaterial Abbe number while diffractive effects are controlled by diffractive pattern topography. The insertion of a multifocal diffractive lens following crystalline lens extraction may significantly modify the chromatic aberration of the pseudophakic eye. Chromatic aberrations induce vision losses due to sharpness reduction of (any) object edges. The contrast sensitivity as well as the visual acuity are then reduced. This fact has especially been proven with measurements on optical benches. Moreover, diffractive and refractive effects act in an opposite ways and can in principle be compensated. However rules to creates an achromatic lens based on refractive-diffractive principles are quite complex. [less ▲]

Detailed reference viewed: 36 (8 ULiège)
See detailEvaluation of the longitudinal chromatic aberration generated by diffractive IOLs
Gatinel, Damien; Pagnoulle, Christophe; Loicq, Jerôme ULiege

Poster (2018, September 23)

Purpose: To investigate some chromatic properties of hybrid refractive-diffractive extended depth of focus (EDOF) and multifocal IOLs using an optical bench and different illumination wavelengths. Methods ... [more ▼]

Purpose: To investigate some chromatic properties of hybrid refractive-diffractive extended depth of focus (EDOF) and multifocal IOLs using an optical bench and different illumination wavelengths. Methods: The induction and compensation of longitudinal chromatic aberration (LCA) were investigated on an optical bench using the through-focus energy efficiency (TFEE) curves of different wavelength for various hybrid refractive-diffractive EDOF, bi, and trifocal IOLs. Results : The LCA of each IOL can be estimated from the location of TFEE curves peaks for the tested wavelengths. For IOLs diffracting mainly in 0th and 1st order (green), the chromatic defocus is of refractive type for far foci (bi & trifocal), compensated for intermediate foci (trifocal), and reversed (diffraction dominant) for near foci (trifocal & bifocal). For IOLs diffracting in 1st and 2nd order (green), LCA is compensated for far and intermediate foci (EDOF and trifocal), and reversed for near foci (trifocal). However, there are important differences in height of energy peaks for blue and red wavelengths. Conclusions: It is theoretically possible to conceive diffractive lenses self-corrected for LCA at some of their foci. However, even when corrected for defocus, there are differences in the energy efficiency (peak height) obtained for the blue and red wavelengths. [less ▲]

Detailed reference viewed: 13 (1 ULiège)
Full Text
See detailCharacterizing the atmosphere of Proxima b with a space-based mid-infrared nulling interferometer
Defrere, Denis ULiege; Léger, A.; Absil, Olivier ULiege et al

in Proceedings of SPIE: The International Society for Optical Engineering (2018, July 09), 10701

Proxima b is our nearest potentially rocky exoplanet and represents a formidable opportunity for exoplanet science and possibly astrobiology. With an angular separation of only 35 mas (or 0.05 AU) from ... [more ▼]

Proxima b is our nearest potentially rocky exoplanet and represents a formidable opportunity for exoplanet science and possibly astrobiology. With an angular separation of only 35 mas (or 0.05 AU) from its host star, Proxima b is however hardly observable with current imaging telescopes and future space-based coronagraphs. One way to separate the photons of the planet from those of its host star is to use an interferometer that can easily resolve such spatial scales. In addition, its proximity to Earth and its favorable contrast ratio compared with its host M dwarf (approximately 10-5 at 10 microns) makes it an ideal target for a space-based nulling interferometer with relatively small apertures. In this paper, we present the motivation for observing this planet in the mid-infrared (5-20 microns) and the corresponding technological challenges. Then, we describe the concept of a space-based infrared interferometer with relatively small (<1m in diameter) apertures that can measure key details of Proxima b, such as its size, temperature, climate structure, as well as the presence of important atmospheric molecules such as H2O, CO2, O3, and CH4. Finally, we illustrate the concept by showing realistic observations using synthetic spectra of Proxima b computed with coupled climate chemistry models. © 2018 SPIE. [less ▲]

Detailed reference viewed: 57 (14 ULiège)