Results 21 to 30 of about 3,877 (212)

Wavefront Sensing by a Common-Path Interferometer for Wavefront Correction in Phase and Amplitude by a Liquid Crystal Spatial Light Modulator Aiming the Exoplanet Direct Imaging

Photonics, 2023
We implemented the common-path achromatic interfero-coronagraph both for the wavefront sensing and the on-axis image component suppression, aiming for the stellar coronagraphy.
Andrey Yudaev, Alexander Kiselev, Inna Shashkova, Alexander Tavrov, Alexander Lipatov, Oleg Korablev   +5 more
doaj   +1 more source

A Wolf 359 in Sheep's Clothing: Hunting for Substellar Companions in the Fifth-closest System Using Combined High-contrast Imaging and Radial Velocity Analysis

The Astronomical Journal, 2023
Wolf 359 (CN Leo, GJ 406, Gaia DR3 3864972938605115520) is a low-mass star in the fifth-closest neighboring system (2.41 pc). Because of its relative youth and proximity, Wolf 359 offers a unique opportunity to study substellar companions around M stars ...
Rachel Bowens-Rubin, Joseph M. Akana Murphy, Philip M. Hinz, Mary Anne Limbach, Andreas Seifahrt, Rocio Kiman, Maïssa Salama, Sagnick Mukherjee, Madison Brady, Aarynn L. Carter, Rebecca Jensen-Clem, Maaike A. M. van Kooten, Howard Isaacson, Molly Kosiarek, Jacob L. Bean, David Kasper, Rafael Luque, Gudmundur Stefánsson, Julian Stürmer   +18 more
doaj   +1 more source

On-sky observations with an achromatic hybrid phase knife coronagraph in the visible [PDF]

, 2006
CONTEXT: The four-quadrant phase mask stellar coronagraph, introduced by D. Rouan et al., is capable of achieving very high dynamical range imaging and was studied in the context of the direct detection of extra-solar planets.
A. Domiciano de Souza, Abe, Abe, Aime, Aime, Aristidi, Bloemhof, F. Vakili, Fini, Gay, Guyon, J. Gay, J.-P. Rivet, Kuchner, L. Abe, M. Beaulieu, Marois, Marois, Mayor, Racine, Roddier, Rouan, S. Dervaux, Soummer, Vanderbei   +24 more
core   +5 more sources

JWST/NIRCam Coronagraphy of the Young Planet-hosting Debris Disk AU Microscopii

The Astronomical Journal, 2023
High-contrast imaging of debris disk systems permits us to assess the composition and size distribution of circumstellar dust, to probe recent dynamical histories, and to directly detect and characterize embedded exoplanets. Observations of these systems
Kellen Lawson, Joshua E. Schlieder, Jarron M. Leisenring, Ell Bogat, Charles A. Beichman, Geoffrey Bryden, András Gáspár, Tyler D. Groff, Michael W. McElwain, Michael R. Meyer, Thomas Barclay, Per Calissendorff, Matthew De Furio, Marie Ygouf, Anthony Boccaletti, Thomas P. Greene, John Krist, Peter Plavchan, Marcia J. Rieke, Thomas L. Roellig, John Stansberry, John P. Wisniewski, Erick T. Young   +22 more
doaj   +1 more source

Space Weather Monitor at the L5 Point: A Case Study of a CME Observed with STEREO B

Space Weather, Volume 18, Issue 10, October 2020., 2020
Abstract An important location for future space weather monitoring is the Lagrange point 5 (L5) of the Sun‐Earth system. We test the performance of L5 for space weather monitoring using STEREO B observations of an Earth‐directed coronal mass ejection (CME), seen as a partial halo by SOHO at L1.
L. Rodriguez, C. Scolini, M. Mierla, A. N. Zhukov, M. J. West   +4 more
wiley   +1 more source

PROSWIFT Bill and the 2020 Space Weather Operations and Research Infrastructure Workshop From the National Academies of Sciences, Engineering, and Medicine

Space Weather, Volume 18, Issue 10, October 2020., 2020
Abstract The Space Weather Research and Forecasting Act (PROSWIFT) passed the U.S. Senate in July 2020 and the House of Representative on 16 September; it directs NOAA to capture remote images of coronal mass ejections (CMEs) with the Space Weather Follow‐On at L1 (SWFO‐L1) mission.
Noé Lugaz
wiley   +1 more source

Speckle statistics in direct and coronagraphic imaging [PDF]

Proceedings of the International Astronomical Union, 2005
In this communication, we study the statistical properties of the light intensity in direct and coronagraphic images, in the context of ground-based Extreme Adaptive Optics observations. The same approach can also be used for space observations with different scales.
Soummer, R., Aimé, Carole, Ferrari, Anthony, Sivaramakrishnan, A., Jolissaint, L., Lloyd, J., Oppenheimer, B., Makidon, R., Carbillet, M.   +8 more
openaire   +2 more sources

Searching for Planets Orbiting Fomalhaut with JWST/NIRCam

The Astronomical Journal, 2023
We report observations with the JWST/NIRCam coronagraph of the Fomalhaut ( α PsA) system. This nearby A star hosts a complex debris disk system discovered by the IRAS satellite.
Marie Ygouf, Charles A. Beichman, Jorge Llop-Sayson, Geoffrey Bryden, Jarron M. Leisenring, András Gáspár, John E. Krist, Marcia J. Rieke, George H. Rieke, Schuyler Grace Wolff, Thomas L. Roellig, Kate Su, Kevin N. Hainline, Klaus W. Hodapp, Thomas P. Greene, Michael R. Meyer, Douglas M. Kelly, Karl Misselt, John Stansberry, Martha Boyer, Doug Johnstone, Scott Horner, Alexandra Z. Greenbaum   +22 more
doaj   +1 more source

XAO coronagraphy with the High-Order Test bench

EPJ Web of Conferences, 2011
Extreme adaptive optics systems dedicated to the search for extra solar planets are currently being developed for 8–10 meter class telescopes. The High-Order Test bench (HOT) is a high-contrast imaging adaptive optics bench developed at ESO.
Kasper M., Aller Carpentier E., Martinez P.   +2 more
doaj   +1 more source

Ground-Based Coronagraphy with High Order Adaptive Optics [PDF]

, 2001
We summarize the theory of coronagraphic optics, and identify a dimensionless fine-tuning parameter, F, which we use to describe the Lyot stop size in the natural units of the coronagraphic optical train and the observing wavelength.
Anand Sivaramakrishnan, Christopher D. Koresko, Fried D. L., Glindemann A., Golimowski D. A., Lyot B., Malbet F., Marc J. Kuchner, Noll R. J., Russell B. Makidon, Thomas Berkefeld, Wang T.   +11 more
core   +2 more sources