演講資訊

Po-Shih Chiang 姜博識"Discovery and spectroscopy of the young Jovian planet 51 Eri b with the Gemini Planet Imager"

時間/地點: 2015-10-08 12:00 [S4-914]

摘要:

Directly detecting thermal emission from young extrasolar planets allows measurement of their atmospheric composition and luminosity, which is influenced by their formation mechanism. Using the Gemini Planet Imager, we discovered a planet orbiting the $sim$20 Myr-old star 51 Eridani at a projected separation of 13 astronomical units. Near-infrared observations show a spectrum with strong methane and water vapor absorption. Modeling of the spectra and photometry yields a luminosity of L/LS=1.6-4.0 x 10-6 and an effective temperature of 600-750 K. For this age and luminosity, "hot-start" formation models indicate a mass twice that of Jupiter. This planet also has a sufficiently low luminosity to be consistent with the "cold- start" core accretion process that may have formed Jupiter.

作者:

B. Macintosh, et al.

期刊:

arXiv:1508.03084

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