RECENT TRANSITS OF THE SUPER-EARTH EXOPLANET GJ 1214b
| Autor: | Flynn Haase, Kevin Bays, Brian Jackson, E. O'Gorman, Drake Deming, Steven W. Peterson, Alan Lundsford, Pedro V. Sada, Donald E. Jennings |
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| Rok vydání: | 2010 |
| Předmět: |
Earth and Planetary Astrophysics (astro-ph.EP)
Physics Super-Earth Astrophysics::Instrumentation and Methods for Astrophysics FOS: Physical sciences Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Exoplanet Earth radius law.invention Telescope Photometry (astronomy) Space and Planetary Science Observatory law Planet Limb darkening Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Astrophysics::Galaxy Astrophysics Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | The Astrophysical Journal. 720:L215-L218 |
| ISSN: | 2041-8213 2041-8205 |
| DOI: | 10.1088/2041-8205/720/2/l215 |
| Popis: | We report recent ground-based photometry of the transiting super-Earth exoplanet GJ1214b at several wavelengths, including the infrared near 1.25 microns (J-band). We observed a J-band transit with the FLAMINGOS infrared imager and the 2.1-meter telescope on Kitt Peak, and we observed several optical transits using a 0.5-meter telescope on Kitt Peak and the 0.36-meter Universidad de Monterrey Observatory telescope. Our high-precision J-band observations exploit the brightness of the M-dwarf host star at this infrared wavelength as compared to the optical, as well as being significantly less affected by stellar activity and limb darkening. We fit the J-band transit to obtain an independent determination of the planetary and stellar radii. Our radius for the planet (2.61^+0.30_-0.11 Earth radii) is in excellent agreement with the discovery value reported by Charbonneau et al. based on optical data. We demonstrate that the planetary radius is insensitive to degeneracies in the fitting process. We use all of our observations to improve the transit ephemeris, finding P=1.5804043 +/- 0.0000005 days, and T0=2454964.94390 +/- 0.00006 BJD. Comment: Accepted for ApJ Letters, 7 pages, 3 Figures, 2 Tables |
| Databáze: | OpenAIRE |
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