Zobrazeno 1 - 10
of 508
pro vyhledávání: '"Olivier Guyon"'
Autor:
Alexander Chaushev, Steph Sallum, Julien Lozi, Jeffrey Chilcote, Tyler Groff, Olivier Guyon, N. Jeremy Kasdin, Barnaby Norris, Andy Skemer
Publikováno v:
The Astronomical Journal, Vol 168, Iss 2, p 70 (2024)
Discovering new actively accreting protoplanets is crucial to answering open questions about planet formation. However, identifying such planets at orbital distances where they are expected to be abundant is extremely challenging, both due to the tec
Externí odkaz:
https://doaj.org/article/c3cbb29d6aef4113996b5e4f0c88644c
Autor:
Maria Vincent, Kellen Lawson, Thayne Currie, Jonathan P. Williams, Olivier Guyon, Julien Lozi, Vincent Deo, Sébastien Vievard
Publikováno v:
The Astronomical Journal, Vol 168, Iss 1, p 6 (2024)
We present a multiwavelength (1.16–2.37 μ m) view of the debris disk around BD+45 ^° 598, using the Subaru Coronagraphic Extreme Adaptive Optics system paired with the Coronagraphic High Angular Resolution Imaging Spectrograph. With an assumed ag
Externí odkaz:
https://doaj.org/article/8434ff416251403dadbfaf17db24b52c
Direct-imaging Discovery of a Substellar Companion Orbiting the Accelerating Variable Star HIP 39017
Autor:
Taylor L. Tobin, Thayne Currie, Yiting Li, Jeffrey Chilcote, Timothy D. Brandt, Brianna Lacy, Masayuki Kuzuhara, Maria Vincent, Mona El Morsy, Vincent Deo, Jonathan P. Williams, Olivier Guyon, Julien Lozi, Sebastien Vievard, Nour Skaf, Kyohoon Ahn, Tyler Groff, N. Jeremy Kasdin, Taichi Uyama, Motohide Tamura, Aidan Gibbs, Briley L. Lewis, Rachel Bowens-Rubin, Maïssa Salama, Qier An, Minghan Chen
Publikováno v:
The Astronomical Journal, Vol 167, Iss 5, p 205 (2024)
We present the direct-imaging discovery of a substellar companion (a massive planet or low-mass brown dwarf) to the young, γ Doradus ( γ Dor)-type variable star HIP 39017 (HD 65526). The companion’s SCExAO/CHARIS JHK (1.1–2.4 μ m) spectrum and
Externí odkaz:
https://doaj.org/article/31d7a3c359a54d8bbc679c9e0156b625
Autor:
Yasuhiro Hasegawa, Taichi Uyama, Jun Hashimoto, Yuhiko Aoyama, Vincent Deo, Olivier Guyon, Julien Lozi, Barnaby Norris, Motohide Tamura, Sebastien Vievard
Publikováno v:
The Astronomical Journal, Vol 167, Iss 3, p 105 (2024)
Recent high-sensitivity observations reveal that accreting giant planets embedded in their parental circumstellar disks can emit H α at their final formation stages. While the origin of this emission is not yet determined, magnetospheric accretion i
Externí odkaz:
https://doaj.org/article/841fcd08141f4a7c8b7d991b98d8196a
Autor:
Jonathan W. Lin, Michael P. Fitzgerald, Yinzi Xin, Yoo Jung Kim, Olivier Guyon, Barnaby Norris, Christopher Betters, Sergio Leon-Saval, Kyohoon Ahn, Vincent Deo, Julien Lozi, Sébastien Vievard, Daniel Levinstein, Steph Sallum, Nemanja Jovanovic
Publikováno v:
The Astrophysical Journal Letters, Vol 959, Iss 2, p L34 (2023)
The direct imaging of an Earth-like exoplanet will require sub-nanometric wave-front control across large light-collecting apertures to reject host starlight and detect the faint planetary signal. Current adaptive optics systems, which use wave-front
Externí odkaz:
https://doaj.org/article/7ffd81a62f2b447e952a23ab50957036
Autor:
Marc-Antoine Martinod, Barnaby Norris, Peter Tuthill, Tiphaine Lagadec, Nemanja Jovanovic, Nick Cvetojevic, Simon Gross, Alexander Arriola, Thomas Gretzinger, Michael J. Withford, Olivier Guyon, Julien Lozi, Sébastien Vievard, Vincent Deo, Jon S. Lawrence, Sergio Leon-Saval
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-11 (2021)
Nulling interferometry is a technique combining lights from different telescopes or apertures to observe weak sources nearby bright ones. The authors report the first nulling interferometer implemented in a photonic chip doing spectrally dispersed nu
Externí odkaz:
https://doaj.org/article/c96f5ed116ab4c0e8ca914f305acfcab
Autor:
Nemanja Jovanovic, Pradip Gatkine, Narsireddy Anugu, Rodrigo Amezcua-Correa, Ritoban Basu Thakur, Charles Beichman, Chad F. Bender, Jean-Philippe Berger, Azzurra Bigioli, Joss Bland-Hawthorn, Guillaume Bourdarot, Charles M Bradford, Ronald Broeke, Julia Bryant, Kevin Bundy, Ross Cheriton, Nick Cvetojevic, Momen Diab, Scott A Diddams, Aline N Dinkelaker, Jeroen Duis, Stephen Eikenberry, Simon Ellis, Akira Endo, Donald F Figer, Michael P. Fitzgerald, Itandehui Gris-Sanchez, Simon Gross, Ludovic Grossard, Olivier Guyon, Sebastiaan Y Haffert, Samuel Halverson, Robert J Harris, Jinping He, Tobias Herr, Philipp Hottinger, Elsa Huby, Michael Ireland, Rebecca Jenson-Clem, Jeffrey Jewell, Laurent Jocou, Stefan Kraus, Lucas Labadie, Sylvestre Lacour, Romain Laugier, Katarzyna Ławniczuk, Jonathan Lin, Stephanie Leifer, Sergio Leon-Saval, Guillermo Martin, Frantz Martinache, Marc-Antoine Martinod, Benjamin A Mazin, Stefano Minardi, John D Monnier, Reinan Moreira, Denis Mourard, Abani Shankar Nayak, Barnaby Norris, Ewelina Obrzud, Karine Perraut, François Reynaud, Steph Sallum, David Schiminovich, Christian Schwab, Eugene Serbayn, Sherif Soliman, Andreas Stoll, Liang Tang, Peter Tuthill, Kerry Vahala, Gautam Vasisht, Sylvain Veilleux, Alexander B Walter, Edward J Wollack, Yinzi Xin, Zongyin Yang, Stephanos Yerolatsitis, Yang Zhang, Chang-Ling Zou
Publikováno v:
JPhys Photonics, Vol 5, Iss 4, p 042501 (2023)
Photonic technologies offer numerous functionalities that can be used to realize astrophotonic instruments. The most spectacular example to date is the ESO Gravity instrument at the Very Large Telescope in Chile that combines the light-gathering powe
Externí odkaz:
https://doaj.org/article/0863b9c3cb3d46d28bd2461a6639bd31
Autor:
Gabriele Cugno, Yifan Zhou, Thanawuth Thanathibodee, Per Calissendorff, Michael R. Meyer, Suzan Edwards, Jaehan Bae, Myriam Benisty, Edwin Bergin, Matthew De Furio, Stefano Facchini, Jared R. Males, Laird M. Close, Richard D. Teague, Olivier Guyon, Sebastiaan Y. Haffert, Alexander D. Hedglen, Maggie Kautz, Andrés Izquierdo, Joseph D. Long, Jennifer Lumbres, Avalon L. McLeod, Logan A. Pearce, Lauren Schatz, Kyle Van Gorkom
Publikováno v:
The Astronomical Journal, Vol 166, Iss 4, p 162 (2023)
The detection of emission lines associated with accretion processes is a direct method for studying how and where gas giant planets form, how young planets interact with their natal protoplanetary disk, and how volatile delivery to their atmosphere t
Externí odkaz:
https://doaj.org/article/c32e36b917c7479db99636ad9d8b54d2
Autor:
Ryan M. Lau, Jason Wang, Matthew J. Hankins, Thayne Currie, Vincent Deo, Izumi Endo, Olivier Guyon, Yinuo Han, Anthony P. Jones, Nemanja Jovanovic, Julien Lozi, Anthony F. J. Moffat, Takashi Onaka, Garreth Ruane, Andreas A. C. Sander, Samaporn Tinyanont, Peter G. Tuthill, Gerd Weigelt, Peredur M. Williams, Sebastien Vievard
Publikováno v:
The Astrophysical Journal, Vol 951, Iss 2, p 89 (2023)
Wolf-Rayet (WR) 140 is the archetypal periodic dust-forming colliding-wind binary that hosts a carbon-rich WR (WC) star and an O-star companion with an orbital period of 7.93 yr and an orbital eccentricity of 0.9. Throughout the past few decades, mul
Externí odkaz:
https://doaj.org/article/9bd216773ffa43d7a08a9226c15c504b
Autor:
Kyle Franson, Brendan P. Bowler, Mariangela Bonavita, Timothy D. Brandt, Minghan Chen, Matthias Samland, Zhoujian Zhang, Anna Lueber, Kevin Heng, Daniel Kitzmann, Trevor Wolf, Brandon A. Jones, Quang H. Tran, Daniella C. Bardalez Gagliuffi, Beth Biller, Jeffrey Chilcote, Justin R. Crepp, Trent J. Dupuy, Jacqueline Faherty, Clémence Fontanive, Tyler D. Groff, Raffaele Gratton, Olivier Guyon, Rebecca Jensen-Clem, Nemanja Jovanovic, N. Jeremy Kasdin, Julien Lozi, Eugene A. Magnier, Koraljka Mužić, Aniket Sanghi, Christopher A. Theissen
Publikováno v:
The Astronomical Journal, Vol 165, Iss 2, p 39 (2023)
Benchmark brown dwarf companions with well-determined ages and model-independent masses are powerful tools to test substellar evolutionary models and probe the formation of giant planets and brown dwarfs. Here, we report the independent discovery of
Externí odkaz:
https://doaj.org/article/10707f513bdd4aa18c59ad8d42494116