Results 31 to 40 of about 85 (81)

Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of α Centauri A. I. Observations, Orbital and Physical Properties, and Exozodi Upper Limits

The Astrophysical Journal Letters
We report on coronagraphic observations of the nearest solar-type star, α Centauri A ( α Cen A), using the MIRI instrument on the James Webb Space Telescope.
Charles Beichman, Aniket Sanghi, Dimitri Mawet, Pierre Kervella, Kevin Wagner, Billy Quarles, Jack J. Lissauer, Max Sommer, Mark Wyatt, Nicolas Godoy, William O. Balmer, Laurent Pueyo, Jorge Llop-Sayson, Jonathan Aguilar, Rachel Akeson, Ruslan Belikov, Anthony Boccaletti, Elodie Choquet, Edward Fomalont, Thomas Henning, Dean Hines, Renyu Hu, Pierre-Olivier Lagage, Jarron Leisenring, James Mang, Michael Ressler, Eugene Serabyn, Pascal Tremblin, Marie Ygouf, Mantas Zilinskas   +29 more
doaj   +1 more source

Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of α Centauri A. II. Binary Star Modeling, Planet and Exozodi Search, and Sensitivity Analysis

The Astrophysical Journal Letters
The James Webb Space Telescope (JWST) observed our closest solar twin, α Centauri A ( α Cen A), with the Mid-Infrared Instrument in the F1550C (15.5 μ m) coronagraphic imaging mode at three distinct epochs between 2024 August and 2025 April.
Aniket Sanghi, Charles Beichman, Dimitri Mawet, William O. Balmer, Nicolas Godoy, Laurent Pueyo, Anthony Boccaletti, Max Sommer, Alexis Bidot, Elodie Choquet, Pierre Kervella, Pierre-Olivier Lagage, Jarron Leisenring, Jorge Llop-Sayson, Michael Ressler, Kevin Wagner, Mark Wyatt   +16 more
doaj   +1 more source

FIRST-LIGHT LBT NULLING INTERFEROMETRIC OBSERVATIONS: WARM EXOZODIACAL DUST RESOLVED WITHIN A FEW AU OF η Crv [PDF]

The Astrophysical Journal, 2015
9 pages, 6 figures, accepted for publication in ...
Defrere, Denis, Hinz, P. M., Skemer, A. J., Kennedy, G. M., Bailey, V. P., Hoffmann, W. F., Mennesson, B., Millan-Gabet, R., Danchi, W. C., Absil, Olivier, Arbo, P., Beichman, C., Brusa, G., Bryden, G., Downey, E. C., Durney, O., Esposito, S., Gaspar, A., Grenz, P., Haniff, C., Hill, J. M., Lebreton, J., Leisenring, J. M., Males, J. R., Marion, Lindsay, McMahon, T. J., Montoya, M., Morzinski, K. M., Pinna, E., Puglisi, A., Rieke, G., Roberge, A., Serabyn, E., Sosa, R., Stapeldfeldt, K., Su, K., Vaitheeswaran, V., Vaz, A., Weinberger, A. J., Wyatt, M. C.   +39 more
openaire   +4 more sources

How Long-lived Grains Dominate the Shape of the Zodiacal Cloud

The Planetary Science Journal
Grain–grain collisions shape the three-dimensional size and velocity distribution of the inner Zodiacal Cloud and the impact rates of dust on inner planets, yet they remain the least understood sink of zodiacal dust grains. For the first time, we combine
Petr Pokorný, Althea V. Moorhead, Marc J. Kuchner, Jamey R. Szalay, David M. Malaspina   +4 more
doaj   +1 more source

EXOZODIACAL DUST LEVELS FOR NEARBY MAIN-SEQUENCE STARS: A SURVEY WITH THE KECK INTERFEROMETER NULLER [PDF]

The Astrophysical Journal, 2011
The Keck Interferometer Nuller (KIN) was used to survey 25 nearby main-sequence stars in the mid-infrared, in order to assess the prevalence of warm circumstellar (exozodiacal) dust around nearby solar-type stars. The KIN measures circumstellar emission by spatially blocking the star but transmitting the circumstellar flux in a region typically 0.1-4 ...
Millan-Gabet, R., Serabyn, E., Mennesson, B., Traub, W. A., Barry, R. K., Danchi, W. C., Kuchner, M., Stark, C. C., Ragland, S., Hrynevych, M., Woillez, J., Stapelfeldt, K., Bryden, G., Colavita, M. M., Booth, A. J.   +14 more
openaire   +2 more sources

JWST/NIRSpec Detects Warm CO Emission in the Terrestrial-planet Zone of HD 131488

The Astrophysical Journal
We have obtained a high-resolution, JWST NIRSpec 2.87–5.14 μ m spectrum of the debris disk around HD 131488. We discover CO fundamental emission indicating the presence of warm fluorescent gas within ∼10 au of the star.
Cicero X. Lu, Isabel Rebollido, Sean Brittain, Tracy Beck, Christine H. Chen, Kadin Worthen, Joan Najita, Chen Xie, Aoife Brennan, Amaya Moro-Martin, John Debes, Kevin France, Luca Matrà, Marshall Perrin, Aki Roberge   +14 more
doaj   +1 more source

Hot exozodiacal dust around Fomalhaut: The MATISSE perspective

Astronomy & Astrophysics
Context. Excess over the stellar photospheric emission of main-sequence stars has been found in interferometric near-infrared observations, and is attributed to the presence of hot exozodiacal dust (HEZD). As part of our effort to detect and characterize HEZD around the nearby A3 V star Fomalhaut, we carried out the first interferometric observations ...
K. Ollmann, F. Kirchschlager, T. A. Stuber, K. Tsishchankava, A. Matter, S. Ertel, T. D. Pearce, A. V. Krivov, S. Wolf   +8 more
openaire   +2 more sources

Prospects for the characterisation of exo-zodiacal dust with the VLTI [PDF]

Experimental Astronomy, 2018
Accepted for publication in Experimental ...
Ertel, S., Absil, O., Defrère, D., Augereau, J. -C., Mennesson, B.   +4 more
openaire   +6 more sources

The HOSTS survey for exo-zodiacal dust: preliminary results and future prospects [PDF]

Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 2018
[abridged] The presence of large amounts of dust in the habitable zones of nearby stars is a significant obstacle for future exo-Earth imaging missions. We executed an N band nulling interferometric survey to determine the typical amount of such exozodiacal dust around a sample of nearby main sequence stars.
Ertel, S., Kennedy, G. M., Defrere, Denis, Hinz, P., Shannon, A. B., Mennesson, B., Danchi, W. C., Gelino, C., Hill, J. M., Hoffman, W. F., Rieke, G., Spalding, E., Stone, J. M., Vaz, A., Weinberger, A. J., Willems, P., Absil, Olivier, 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, Lindsay, McMahon, T. J., Millan-Gabet, R., Montoya, M., Morzinski, K. M., Pinna, E., Power, J., Puglisi, A., Roberge, A., Serabyn, E., Skemer, A. J., Stapelfeldt, K., Su, K. Y. L., Vaitheeswaran, V., Wyatt, M. C.   +42 more
openaire   +4 more sources

The dynamics of exozodiacal dust

, 2023
This thesis manuscript presents the work that I carried out during my thesis, the subject of which is "The dynamics of exozodiacal dust".The exozodiacal dust, is, by analogy to the zodiacal dust of the solar system, the internal component of debris disks around stellar systems : dust located from a few stellar radii to few astronomical units.
openaire   +1 more source