Direct imaging and astrometric detection of a gas giant planet orbiting an accelerating star

• 成果类型: Article
• 署名作者: Currie, Thayne; Brandt, Mirek; Brandt, Timothy D.; Lacy, Brianna; Burrows, Adam; Guyon, Olivier; Tamura, Motohide; Liu, Ranger Y.; Sagynbayeva, Sabina; Tobin, Taylor; Chilcote, Jeffrey; Groff, Tyler; Marois, Christian; Thompson, William; Murphy, Simon J.; Kuzuhara, Masayuki; Lawson, Kellen; Lozi, Julien; Deo, Vincent; Vievard, Sebastien; Skaf, Nour; Uyama, Taichi; Jovanovic, Nemanja; Martinache, Frantz; Kasdin, N. Jeremy; Kudo, Tomoyuki; McElwain, Michael; Janson, Markus; Wisniewski, John; Hodapp, Klaus; Nishikawa, Jun; Helminiak, Krzysztof; Kwon, Jungmi; Hayashi, Masahiko
• 署名单位: National Institutes of Natural Sciences (NINS) - Japan; National Astronomical Observatory of Japan (NAOJ); University of Texas System; University of Texas at San Antonio; Eureka Scientific; University of California System; University of California Santa Barbara; Princeton University; University of Texas System; University of Texas Austin; National Institutes of Natural Sciences (NINS) - Japan; Astrobiology Center (ABC); University of Arizona; National Institutes of Natural Sciences (NINS) - Japan; National Astronomical Observatory of Japan (NAOJ); University of Tokyo; Columbia University; State University of New York (SUNY) System; Stony Brook University; University of Notre Dame; National Aeronautics & Space Administration (NASA); NASA Goddard Space Flight Center; National Research Council Canada; University of Victoria; University of Sydney; University of Southern Queensland; California Institute of Technology; California Institute of Technology; Universite Cote d'Azur; Observatoire de la Cote d'Azur; Princeton University; Stockholm University; George Mason University; University of Hawaii System; University Hawaii Hilo; Polish Academy of Sciences; Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences; University of Michigan System; University of Michigan
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-11909
• DOI: 10.1126/science.abo6192
• 发表日期: 2023-04-13
• 关键词: very-low-mass; mu-m; dynamical masses; brown dwarfs; young; DISCOVERY; spectroscopy; companions; hipparcos; temperature

摘要

Direct imaging of gas giant exoplanets provides information on their atmospheres and the architectures of planetary systems. However, few planets have been detected in blind surveys with direct imaging. Using astrometry from the Gaia and Hipparcos spacecraft, we identified dynamical evidence for a gas giant planet around the nearby star HIP 99770. We confirmed the detection of this planet with direct imaging using the Subaru Coronagraphic Extreme Adaptive Optics instrument. The planet, HIP 99770 b, orbits 17 astronomical units from its host star, receiving an amount of light similar to that reaching Jupiter. Its dynamical mass is 13.9 to 16.1 Jupiter masses. The planet-to-star mass ratio [(7 to 8) x 10-3] is similar to that of other directly imaged planets. The planet's atmospheric spectrum indicates an older, less cloudy analog of the previously imaged exoplanets around HR 8799.