Dynamical Evidence For A Sub-stellar Companion To By Draconis

Details Dynamical Evidence For A Sub-stellar Companion To By Draconis Dynamical Evidence For A Sub-stellar Companion To By Draconis

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.3202h&link_type=abstract

American Astronomical Society, ESS meeting #2, #32.02

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the results of our analysis of the famous double-lined spectroscopic binary BY Draconis, a prototype of a whole class of active variables. We combine our high-precision RV measurements (orbital fit rms 160 m/s) with the archival visibility measurements from the PTI instrument. For the firs time we were able to derive its physical and orbital parameters with precision sufficient to securely estimate the evolutionary status of the system. We conclude that BY Dra is a main-sequence system with components rotating pseudo-synchronously, but the high eccentricity (e=0.3) is puzzling. Our analysis shows that this may be caused by a planetary-mass companion on a dynamically stable orbit with the period of few tenths to few hundred days, which induces Kozai cycles in the inner binary.

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