Results 1 to 10 of about 66 (62)

Mitigating Worst-case Exozodiacal Dust Structure in High-contrast Images of Earth-like Exoplanets

The Astronomical Journal, 2023
Detecting Earth-like exoplanets in direct images of nearby Sun-like systems brings a unique set of challenges that must be addressed in the early phases of designing a space-based direct imaging mission.
Miles H. Currie, Christopher C. Stark, Jens Kammerer, Roser Juanola-Parramon, Victoria S. Meadows   +4 more
doaj   +3 more sources

Close-in faint companions mimicking interferometric hot exozodiacal dust observations

Astronomy & Astrophysics
Context. Interferometric observations of various nearby main sequence stars display an unexpected infrared excess, raising questions about its origin.
Tsishchankava Katsiaryna, Kirchschlager Florian, Krieger Anton, Stuber Thomas A., Wolf Sebastian   +4 more
doaj   +3 more sources

Unraveling the Mystery of Exozodiacal Dust [PDF]

Proceedings of the International Astronomical Union, 2013
AbstractExozodiacal dust clouds are thought to be the extrasolar analogs of the Solar System's zodiacal dust. Studying these systems provides insights in the architecture of the innermost regions of planetary systems, including the Habitable Zone. Furthermore, the mere presence of the dust may result in major obstacles for direct imaging of earth-like ...
Ertel, Steve, Augereau, Jean-Charles, Thébault, Philippe, Absil, Olivier, Bonsor, A., Defrère, Denis, Kral, Quentin, Le Bouquin, Jean-Baptiste, Lebreton, J., Coudé Du Foresto, Vincent   +9 more
openaire   +5 more sources

Hot exozodiacal dust: an exocometary origin? [PDF]

Astronomy & Astrophysics, 2019
Context. Near- and mid-infrared interferometric observations have revealed populations of hot and warm dust grains populating the inner regions of extrasolar planetary systems. These are known as exozodiacal dust clouds, or exozodis, reflecting the similarity with the solar system’s zodiacal cloud. Radiative transfer models have constrained the dust to
É. Sezestre, J.-C. Augereau, P. Thébault   +2 more
openaire   +4 more sources

The HOSTS Survey—Exozodiacal Dust Measurements for 30 Stars [PDF]

The Astronomical Journal, 2018
Abstract The Hunt for Observable Signatures of Terrestrial Systems survey searches for dust near the habitable zones (HZs) around nearby, bright main-sequence stars. We use nulling interferometry in the N band to suppress the bright stellar light and to probe for low levels of HZ dust around the 30 stars observed so far.
S. Ertel, D. Defrère, P. Hinz, B. Mennesson, G. M. Kennedy, W. C. Danchi, C. Gelino, J. M. Hill, W. F. Hoffmann, G. Rieke, A. Shannon, E. Spalding, J. M. Stone, A. Vaz, A. J. Weinberger, P. Willems, O. Absil, P. Arbo, V. P. Bailey, C. Beichman, G. Bryden, E. C. Downey, O. Durney, S. Esposito, A. Gaspar, P. Grenz, C. A. Haniff, J. M. Leisenring, L. Marion, T. J. McMahon, R. Millan-Gabet, M. Montoya, K. M. Morzinski, E. Pinna, J. Power, A. Puglisi, A. Roberge, E. Serabyn, A. J. Skemer, K. Stapelfeldt, K. Y. L. Su, V. Vaitheeswaran, M. C. Wyatt   +42 more
openaire   +7 more sources

Extrasolar comets: The origin of dust in exozodiacal disks? [PDF]

Planetary and Space Science, 2016
21 pages, 10 ...
Marboeuf, U., Bonsor, A., Augereau, J. -C.   +2 more
openaire   +3 more sources

The HOSTS Survey for Exozodiacal Dust: Observational Results from the Complete Survey [PDF]

The Astronomical Journal, 2020
Abstract The Large Binocular Telescope Interferometer (LBTI) enables nulling interferometric observations across the N band (8 to 13 μm) to suppress a star’s bright light and probe for faint circumstellar emission. We present and statistically analyze the results from the LBTI/Hunt for Observable Signatures of Terrestrial Systems survey ...
Ertel, S., Defrere, D., Hinz, P., Mennesson, B., Kennedy, G.M., Danchi, W.C., Gelino, C., Hill, J.M., Hoffmann, W.F., Mazoyer, J., Rieke, G., Shannon, A., Stapelfeldt, K., Spalding, E., Stone, J.M., Vaz, A., Weinberger, A.J., Willems, P., Absil, O., Arbo, P., Bailey, V.P., Beichman, C., Bryden, G., Downey, E.C., Durney, O., Esposito, S., Gaspar, A., Grenz, P., Haniff, C.A., Leisenring, J.M., Marion, L., McMahon, T.J., Millan-Gabet, R., Montoya, M., Morzinski, K.M., Perera, S., Pinna, E., Pott, J-U., Power, J., Puglisi, A., Roberge, A., Serabyn, E., Skemer, A.J., Su, K.YL., Vaitheeswaran, V., Wyatt, M.C.   +45 more
openaire   +5 more sources

The Exozodiacal Dust Problem for Direct Observations of Exo-Earths [PDF]

Publications of the Astronomical Society of the Pacific, 2012
Debris dust in the habitable zones of stars - otherwise known as exozodiacal dust - comes from extrasolar asteroids and comets and is thus an expected part of a planetary system. Background flux from the Solar System's zodiacal dust and the exozodiacal dust in the target system is likely to be the largest source of astrophysical noise in direct ...
Roberge, Aki, Chen, Christine H, Millan-Gabet, Rafael, Weinberger, Alycia J, Hinz, Philip M, Stapelfeldt, Karl R, Absil, Olivier, Kuchner, Marc J, Bryden, Geoffrey, the NASA ExoPAG SAG #1, Team   +9 more
openaire   +3 more sources

How much large dust could be present in hot exozodiacal dust systems?

Astronomy & Astrophysics, 2023
Context. An infrared excess over the stellar photospheric emission of main-sequence stars has been found in interferometric surveys, commonly attributed to the presence of hot exozodiacal dust (HEZD). While submicrometer-sized grains in close vicinity to their host star have been inferred to be responsible for the found near-infrared excesses, the ...
T. A. Stuber, F. Kirchschlager, T. D. Pearce, S. Ertel, A. V. Krivov, S. Wolf   +5 more
openaire   +2 more sources

Sensitivity of the Roman Coronagraph Instrument to Exozodiacal Dust

Publications of the Astronomical Society of the Pacific, 2022
Abstract Exozodiacal dust, warm debris from comets and asteroids in and near the habitable zone of stellar systems, reveals the physical processes that shape planetary systems. Scattered light from this dust is also a source of background flux which must be overcome by future missions to image Earthlike planets. This study quantifies the
Ewan S. Douglas, John Debes, Bertrand Mennesson, Bijan Nemati, Jaren Ashcraft, Bin Ren, Karl R. Stapelfeldt, Dmitry Savransky, Nikole K. Lewis, Bruce Macintosh   +9 more
openaire   +3 more sources