Results 11 to 20 of about 85 (81)

Impact of exozodiacal dust on LUVOIR coronagraphy

, 2022
In this poster, we present our recent work on methods to subtract exozodiacal light from images taken with a future direct imaging mission aiming at detecting Earth-like planets in reflected starlight. Previous studies have assumed that the exozodiacal light can be subtracted down to the photon noise limit.
Kammerer, Jens, Stark, Christopher, Juanola-Parramon, Roser, Nemati, Bijan, Ludwick, Kevin, Miller, Sam   +5 more
openaire   +1 more source

Exozodiacal clouds: hot and warm dust around main sequence stars [PDF]

Astronomical Review, 2017
A warm/hot dust component (at temperature $>$ 300K) has been detected around $\sim$ 20% of stars. This component is called "exozodiacal dust" as it presents similarities with the zodiacal dust detected in our Solar System, even though its physical properties and spatial distribution can be significantly different.
Kral, Quentin, Krivov, Alexander V., Defrere, Denis, van Lieshout, Rik, Bonsor, Amy, Augereau, Jean-Charles, Thebault, Philippe, Ertel, Steve, Lebreton, Jeremy, Absil, Olivier   +9 more
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Constraints on the structure of hot exozodiacal dust belts [PDF]

Monthly Notices of the Royal Astronomical Society, 2017
Recent interferometric surveys of nearby main-sequence stars show a faint but significant near-infrared excess in roughly two dozen systems, i.$\,$e. around $10\,\%$ to $30\,\%$ of stars surveyed. This excess is attributed to dust located in the immediate vicinity of the star, the origin of which is highly debated.
Kirchschlager, F, Wolf, S, Krivov, AV, Mutschke, H, Brunngraeber, R   +4 more
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First L band detection of hot exozodiacal dust with VLTI/MATISSE [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2020
ABSTRACT For the first time, we observed the emission of hot exozodiacal dust in L band. We used the new instrument MATISSE at the Very Large Telescope Interferometer to detect the hot dust around κ Tuc with a significance of 3σ to 6σ at wavelengths between 3.37 and $3.85\, {\mu {\rm m}}$ and a dust-to-star flux ratio of 5 to $7{{{\ \rm ...
Florian Kirchschlager, Steve Ertel, Sebastian Wolf, Alexis Matter, Alexander V Krivov   +4 more
openaire   +3 more sources

Hot exozodiacal dust resolved around Vega with IOTA/IONIC [PDF]

Astronomy & Astrophysics, 2011
10 pages, 9 figures, accepted for publication in A& ...
Defrère, D., Absil, O., Augereau, J. -C., Di Folco, E., Berger, J. -P., Coudé Du Foresto, V., Kervella, P., Le Bouquin, J. -B., Lebreton, J., Millan-Gabet, R., Monnier, J. D., Olofsson, J., Traub, W.   +12 more
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THE TRANSIT LIGHT CURVE OF AN EXOZODIACAL DUST CLOUD [PDF]

The Astronomical Journal, 2011
Planets embedded within debris disks gravitationally perturb nearby dust and can create clumpy, azimuthally asymmetric circumstellar ring structures that rotate in lock with the planet. The Earth creates one such structure in the solar zodiacal dust cloud.
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Simulating the effects of exozodiacal dust in WFIRST CGI observations [PDF]

Techniques and Instrumentation for Detection of Exoplanets IX, 2019
The WFIRST Coronagraph Instrument (CGI) will image the environment close to stars at orders of magnitude higher sensitivity than current observatories. In addition to directly imaging giant exoplanets, WFIRST CGI has unprecedented sensitivity to scattered light from circumstellar dust.
Douglas, Ewan S., Debes, John, Milani, Kian, Xin, Yinzi, Cahoy, Kerri L., Lewis, Nikole K., Macintosh, Bruce   +6 more
openaire   +1 more source

Modelling of mid-infrared interferometric signature of hot exozodiacal dust emission [PDF]

Monthly Notices of the Royal Astronomical Society, 2017
6 pages, 4 figures, 3 tables, accepted for publication in ...
Kirchschlager, Florian, Wolf, Sebastian, Brunngräber, Robert, Matter, Alexis, Krivov, Alexander V., Labdon, Aaron   +5 more
openaire   +4 more sources

Studying hot exozodiacal dust with near-infrared interferometry

SPIE Proceedings, 2012
Since our first detection of a resolved near-infrared emission around the main sequence star Vega, which we identified as the signature of hot dust grains close to the sublimation limit, we have been systematically searching for similar signatures around a magnitude-limited sample of nearby main sequence stars with the FLUOR instrument at the CHARA ...
Absil, Olivier, Defrère, Denis, Le Bouquin, Jean-Baptiste, Mollier, Benjamin, Augereau, Jean-Charles, Coudé Du Foresto, Vincent, Di Folco, E., Ertel, Steve, ten Brummelaar, Theo   +8 more
openaire   +3 more sources

Scattering of small bodies by planets: a potential origin for exozodiacal dust? [PDF]

Astronomy & Astrophysics, 2012
High levels of exozodiacal dust are observed around a growing number of main sequence stars. The origin of such dust is not clear, given that it has a short lifetime against both collisions and radiative forces. Even a collisional cascade with km-sized parent bodies, as suggested to explain outer debris discs, cannot survive sufficiently long.
Bonsor, A., Augereau, J.-C., Thébault, P.   +2 more
openaire   +4 more sources