Results 41 to 50 of about 1,832,653 (172)

Improved Companion Mass Limits for Sirius A with Thermal Infrared Coronagraphy Using a Vector-apodizing Phase Plate and Time-domain Starlight-subtraction Techniques

The Astronomical Journal, 2023
We use observations with the infrared-optimized Magellan Adaptive Optics (MagAO) system and Clio camera in 3.9 μ m light to place stringent mass constraints on possible undetected companions to Sirius A.
Joseph D. Long, Jared R. Males, Sebastiaan Y. Haffert, Logan Pearce, Mark S. Marley, Katie M. Morzinski, Laird M. Close, Gilles P. P. L. Otten, Frans Snik, Matthew A. Kenworthy, Christoph U. Keller, Philip Hinz, John D. Monnier, Alycia Weinberger, Volker Tolls   +14 more
doaj   +1 more source

Prototype Imaging Spectrograph for Coronagraphic Exoplanet Studies (PISCES) for WFIRST/AFTA [PDF]

, 2015
Prototype Imaging Spectrograph for Coronagraphic Exoplanet Studies (PISCES) is a prototype lenslet array based integral field spectrometer (IFS) designed for high contrast imaging of extrasolar planets.
Domingo, Jorge, Grammer, Bryan, McElwain, Michael, Gong, Qian, Greeley, Bradford, Memarsadeghi, Nargess, Perrin, Marshall, Sayson, Llop, Hilton, George, Stapelfeldt, Karl, Marx, Catherine   +10 more
core   +3 more sources

The Effect of Spectral Resolution on Biosignature Detection via Reflected-light Observations of the Earth through Time

The Astrophysical Journal
NASA’s Habitable Worlds Observatory (HWO) will search for biosignatures on Earth-like exoplanets using reflected light spectroscopy. A critical instrument design parameter is resolving power, which must balance biosignature detectability against exposure
Samantha Gilbert-Janizek, Jacob Lustig-Yaeger, Joshua Krissansen-Totton   +2 more
doaj   +1 more source

Designing and testing the coronagraphic Modal Wavefront Sensor: A fast non-common path error sensor for high-contrast imaging [PDF]

, 2016
Non-Common Path Errors (NCPEs) are the dominant factor limiting the performance of current astronomical high-contrast imaging instruments. If uncorrected, the resulting quasi-static speckle noise floor limits coronagraph performance to a raw contrast of ...
Pietrow, A, Snik, Frans, Haffert, S Y, Keller, Christoph U, Wilby, M J, Korkiakoski, Visa, C. U. Keller, M. J. Wilby, F. Snik, S. Haffert, V. Korkiakoski, A. G. M. Pietrow   +11 more
core   +1 more source

Deep HST/STIS Coronagraphic Imaging of the β Pictoris Debris Disk: On the Scattered Light Component of the Cat’s Tail

The Astrophysical Journal Letters
The β Pictoris debris disk is a unique system where mid-infrared coronagraphic imaging with JWST/Mid-Infrared Imager (MIRI) revealed a new spatially resolved substructure known as the Cat’s Tail.
Arin M. Avsar, Kevin Wagner, Dániel Apai, Isabel Rebollido, Antranik A. Sefilian, Marshall D. Perrin, Christopher C. Stark, Gabriel Weible, András Gáspár   +8 more
doaj   +1 more source

ALICE Data Release: A Revaluation of HST -NICMOS Coronagraphic Images

, 2018
International audienceThe Hubble Space Telescope NICMOS instrument was used from 1997 to 2008 to perform coronagraphic observations of about 400 targets.
Soummer, Rémi, Hagan, J. Brendan, Vigan, Arthur, Choquet, Elodie, J. Brendan Hagan, Rémi Soummer, Élodie Choquet, Arthur Vigan   +7 more
core   +1 more source

First Metis Detection of the Helium D3 Line Polarization in a Large Eruptive Prominence

The Astrophysical Journal Letters, 2023
Metis on board Solar Orbiter is the space coronagraph developed by an Italian–German–Czech consortium. It is capable of observing solar corona and various coronal structures in the visible-light (VL) and UV (hydrogen Ly α ) channels simultaneously for ...
Petr Heinzel, Sonja Jejčič, Jiří Štěpán, Roberto Susino, Vincenzo Andretta, Giuliana Russano, Silvano Fineschi, Marco Romoli, Alessandro Bemporad, Arkadiusz Berlicki, Aleksandr Burtovoi, Vania Da Deppo, Yara De Leo, Catia Grimani, Giovanna Jerse, Federico Landini, Giampiero Naletto, Gianalfredo Nicolini, Maurizio Pancrazzi, Tanausú del Pino Alemán, Clementina Sasso, Daniele Spadaro, Marco Stangalini, Daniele Telloni, Luca Teriaca, Michela Uslenghi, Andrés Vicente Arévalo   +26 more
doaj   +1 more source

Experimental validation of joint phase and amplitude wave-front sensing with coronagraphic phase diversity for high-contrast imaging

, 2018
Context. The next generation of space-borne instruments dedicated to the direct detection of exoplanets requires unprecedented levels of wavefront control precision.
Jean-François Sauvage (14388303), Baptiste Paul (17493243), Olivier Herscovici-Schiller (14413998), Pierre Baudoz (15783809), Laurent M. Mugnier (14410023), Raphaël Galicher (17493240)   +5 more
core   +2 more sources

Photometric Variability and Rotation of β Pictoris b from JWST NIRCam Coronagraphic Imaging

The Astronomical Journal
We report the detection of photometric variability in the directly imaged super-Jupiter β  Pictoris b ( β Pic b). Using JWST NIRCam dual-band coronagraphic imaging, we conducted a 16 hr continuous photometric monitoring campaign in the F210M and F410M ...
Yifan Zhou, Beth A. Biller, Aarynn L. Carter, Marshall D. Perrin, Michael Poon, Genaro Suárez, Ben J. Sutlieff, Johanna M. Vos, Jason J. Wang, William O. Balmer, Marta L. Bryan, Anthony Boccaletti, Julien H. Girard, Eileen C. Gonzales, Jens Kammerer, Jarron M. Leisenring, Paulina. Palma-Bifani, Kevin R. Wagner, Dániel Apai, Mickäel Bonnefoy, Brendan P. Bowler, Kyle Franson, Pengyu Liu, Marcio Meléndez, Stanimir A. Metchev, Simon Petrus, Laurent Pueyo, Isabel Rebollido, Andrew J. Skemer, Xianyu Tan, Niall Whiteford   +30 more
doaj   +1 more source

Inferring the Solar Wind Velocity in the Outer Corona Based on Multiview Observations of Small-scale Transients by STEREO/COR2

The Astrophysical Journal
Based on the Heliospheric Imager-1 images of the STEREO twin spacecraft, we established the CORrelation-Aided Reconstruction (CORAR) technique to locate and reconstruct the 3D structures of solar wind transients in interplanetary space.
Shaoyu Lyu, Yuming Wang, Xiaolei Li, Quanhao Zhang, Jiajia Liu   +4 more
doaj   +1 more source