M-band imaging of the hr 8799 planetary system using an innovative loci-based background subtraction technique
Raphael Galicher,Raphael Galicher,Christian Marois,Bruce Macintosh,Travis S. Barman,Quinn Konopacky +5 more
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In this article, an innovative LOCI-based background subtraction scheme that is three times more efficient than a classical median background subtractions for Keck II AO data is presented, representing a gain in telescope time of up to a factor of nine.Abstract:
Multi-wavelength observations/spectroscopy of exoplanetary atmospheres are the basis of the emerging exciting field of comparative exoplanetology. The HR 8799 planetary system is an ideal laboratory to study our current knowledge gap between massive field brown dwarfs and the cold 5 Gyr old solar system planets. The HR 8799 planets have so far been imaged at J- to L-band, with only upper limits available at M-band. We present here deep high-contrast Keck II adaptive optics M-band observations that show the imaging detection of three of the four currently known HR 8799 planets. Such detections were made possible due to the development of an innovative LOCI-based background subtraction scheme that is three times more efficient than a classical median background subtraction for Keck II AO data, representing a gain in telescope time of up to a factor of nine. These M-band detections extend the broadband photometric coverage out to {approx}5 {mu}m and provide access to the strong CO fundamental absorption band at 4.5 {mu}m. The new M-band photometry shows that the HR 8799 planets are located near the L/T-type dwarf transition, similar to what was found by other studies. We also confirm that the best atmospheric fits are consistent with low surfacemore » gravity, dusty, and non-equilibrium CO/CH{sub 4} chemistry models.« lessread more
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The Exoplanet Handbook
TL;DR: In this paper, the authors present an overview of the solar system and its evolution, including the formation and evolution of stars, asteroids, and free-floating planets, as well as their internal and external structures.
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Neglected Clouds in T and Y Dwarf Atmospheres
Caroline V. Morley,Jonathan J. Fortney,Mark S. Marley,Channon Visscher,Didier Saumon,S. K. Leggett +5 more
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Detection of Carbon Monoxide and Water Absorption Lines in an Exoplanet Atmosphere
TL;DR: A spectrum with numerous, well-resolved molecular lines from both water and carbon monoxide from a massive planet orbiting less than 40 astronomical units from the star HR 8799 reveals the planet’s chemical composition, atmospheric structure, and surface gravity, confirming that it is indeed a young planet.
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Imaging Extrasolar Giant Planets
TL;DR: In this paper, a review of recent progress in high-contrast imaging with particular emphasis on observational results, discoveries near and below the deuterium-burning limit, and a practical overview of large-scale surveys and dedicated instruments is presented.
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Direct imaging of a cold jovian exoplanet in orbit around the sun-like star gj 504
Masayuki Kuzuhara,Masayuki Kuzuhara,Masayuki Kuzuhara,Motohide Tamura,Motohide Tamura,Motohide Tamura,Tomoyuki Kudo,Markus Janson,Ryo Kandori,Timothy D. Brandt,Christian Thalmann,David S. Spiegel,Beth Biller,Joseph C. Carson,Yasunori Hori,Ryuji Suzuki,Adam Burrows,Thomas Henning,Edwin L. Turner,Edwin L. Turner,Michael W. McElwain,Amaya Moro-Martin,Amaya Moro-Martin,Takuya Suenaga,Takuya Suenaga,Yasuhiro H. Takahashi,Yasuhiro H. Takahashi,Jungmi Kwon,Jungmi Kwon,Philip W. Lucas,Lyu Abe,Wolfgang Brandner,Sebastian Egner,Markus Feldt,H. Fujiwara,Miwa Goto,Carol A. Grady,Olivier Guyon,Jun Hashimoto,Yutaka Hayano,Masahiko Hayashi,Saeko S. Hayashi,Klaus W. Hodapp,Miki Ishii,Masanori Iye,Gillian R. Knapp,Taro Matsuo,Satoshi Mayama,Shoken Miyama,Jun-Ichi Morino,Jun Nishikawa,Jun Nishikawa,Tetsuro Nishimura,Takayuki Kotani,Nobuhiko Kusakabe,Tae-Soo Pyo,Eugene Serabyn,Hiroshi Suto,Michihiro Takami,Naruhisa Takato,Hiroshi Terada,D. Tomono,Makoto Watanabe,John P. Wisniewski,Toru Yamada,Hideki Takami,Tomonori Usuda +66 more
TL;DR: In this paper, the authors reported the direct-imaging discovery of a Jovian exoplanet around the Sun-like star GJ 504, detected as part of the SEEDS survey.
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