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KNOW THE STAR, KNOW THE PLANET. V. CHARACTERIZATION OF THE STELLAR COMPANION TO THE EXOPLANET HOST STAR HD 177830
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Number of Authors: 24
2015 (English)In: Astronomical Journal, ISSN 0004-6256, E-ISSN 1538-3881, Vol. 150, no 4, 103Article in journal (Refereed) Published
Abstract [en]

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 +/- 1 V. 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 semimajor 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.

Place, publisher, year, edition, pages
2015. Vol. 150, no 4, 103
Keyword [en]
binaries: visual, instrumentation: adaptive optics, stars: individual (HD 177830)
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-125029DOI: 10.1088/0004-6256/150/4/103ISI: 000365863900006OAI: oai:DiVA.org:su-125029DiVA: diva2:893145
Available from: 2016-01-12 Created: 2016-01-07 Last updated: 2016-01-12Bibliographically approved

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Nilsson, Ricky
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