KNOW THE STAR, KNOW THE PLANET. V. CHARACTERIZATION OF THE STELLAR COMPANION TO THE EXOPLANET HOST STAR HD 177830
| Autor: | Thomas Lockhart, Douglas Brenner, Laurent Pueyo, Eric Cady, L. C. Roberts, Christoph Baranec, Neil T. Zimmerman, Charles Beichman, David A. King, Ian Parry, S. Luszcz-Cook, Anand Sivaramakrishnan, Aaron Veicht, Rebecca Oppenheimer, Chengxing Zhai, Justin R. Crepp, Richard Dekany, Rick Burruss, Emily L. Rice, Remi Soummer, Sasha Hinkley, Ricky Nilsson, Gautam Vasisht, Lynne A. Hillenbrand |
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| Rok vydání: | 2015 |
| Předmět: |
Earth and Planetary Astrophysics (astro-ph.EP)
Physics Astrophysics::Instrumentation and Methods for Astrophysics FOS: Physical sciences Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrometry Star (graph theory) Planet V Exoplanet law.invention Integral field spectrograph Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science law Planet Binary star Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Coronagraph Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | The Astronomical Journal. 150:103 |
| ISSN: | 1538-3881 |
| DOI: | 10.1088/0004-6256/150/4/103 |
| Popis: | HD 177830 is an evolved K0IV star with two known exoplanets. In addition to the planetary companions it has a late-type stellar companion discovered with adaptive optics imagery. We observed the binary star system with the PHARO near-IR camera and the Project 1640 coronagraph. Using the Project 1640 coronagraph and integral field spectrograph we extracted a spectrum of the stellar companion. This allowed us to determine that the spectral type of the stellar companion is a M4$\pm$1V. We used both instruments to measure the astrometry of the binary system. Combining these data with published data, we determined that the binary star has a likely period of approximately 800 years with a semi-major axis of 100-200 AU. This implies that the stellar companion has had little or no impact on the dynamics of the exoplanets. The astrometry of the system should continue to be monitored, but due to the slow nature of the system, observations can be made once every 5-10 years. Comment: 6 pages, 5 figures |
| Databáze: | OpenAIRE |
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