Transits and Occultations of an Earth-Sized Planet in an 8.5-Hour Orbit
| Autor: | Michael C. Kotson, Lars A. Buchhave, Alan M. Levine, Roberto Sanchis-Ojeda, Saul Rappaport, Joshua N. Winn, David W. Latham |
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| Přispěvatelé: | Massachusetts Institute of Technology. Department of Physics, MIT Kavli Institute for Astrophysics and Space Research, Sanchis Ojeda, Roberto, Rappaport, Saul A., Winn, Joshua Nathan, Levine, Alan M. |
| Rok vydání: | 2013 |
| Předmět: |
Physics
Earth and Planetary Astrophysics (astro-ph.EP) Brightness Astronomy FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Star (graph theory) Orbital period Orbit Space and Planetary Science Planet System parameters Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Spectroscopy Earth (classical element) Astrophysics::Galaxy Astrophysics Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | arXiv |
| DOI: | 10.48550/arxiv.1305.4180 |
| Popis: | We report the discovery of an Earth-sized planet ($1.16\pm 0.19 R_\oplus$) in an 8.5-hour orbit around a late G-type star (KIC 8435766, Kepler-78). The object was identified in a search for short-period planets in the {\it Kepler} database and confirmed to be a transiting planet (as opposed to an eclipsing stellar system) through the absence of ellipsoidal light variations or substantial radial-velocity variations. The unusually short orbital period and the relative brightness of the host star ($m_{\rm Kep}$ = 11.5) enable robust detections of the changing illumination of the visible hemisphere of the planet, as well as the occultations of the planet by the star. We interpret these signals as representing a combination of reflected and reprocessed light, with the highest planet dayside temperature in the range of 2300 K to 3100 K. Follow-up spectroscopy combined with finer sampling photometric observations will further pin down the system parameters and may even yield the mass of the planet. Comment: Accepted for publication, ApJ, 10 pages and 6 figures |
| Databáze: | OpenAIRE |
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