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And the Oscar Goes to: BD+20 1790 for "The Mystery of the Unseen Companion"

Hernán-Obispo, M. and Gálvez-Ortiz, M. C. and Anglada-Escudé, G. and Kane, S. R. and de Castro, E. and Cornide, M. (2010) And the Oscar Goes to: BD+20 1790 for "The Mystery of the Unseen Companion". In: Highlights of Spanish Astrophysics V. Astrophysics and Space Science Proceedings. Springer , Berlin, p. 413. ISBN 978-3-642-11249-2.

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BD+20 1790 is a young, rich metal and very active late–type K5Ve star. Our group has been developing a study of stellar activity and kinematics for this star over the past years. Previous results show a high level of stellar activity, with the presence of prominence-like structures, spots on surface and strong flare events. Radial velocity (RV) variations with a semi-amplitude of up to 1km s⁻¹ were detected. When the nature of these variations was investigated it was found that they are not due to stellar activity. Based upon the analysis of bisector velocity span, as well as Ca II H & K emission, we report that the best explanation for RV variations is the presence of a sub–stellar companion. The Keplerian fit of the RV data yields an orbital solution for a close-in massive planet with an orbital period of 7.783days. Also, the presence of this close–in massive planet could be an interpretation for the high level of stellar activity detected.

Item Type:Book Section
Related URLs:
URLURL TypeDescription ReadCube access
Anglada-Escudé, G.0000-0002-3645-5977
Kane, S. R.0000-0002-7084-0529
Additional Information:© 2010 Springer-Verlag Berlin Heidelberg. First Online: 25 February 2010.
Series Name:Astrophysics and Space Science Proceedings
Record Number:CaltechAUTHORS:20200603-071819282
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103655
Deposited By: Tony Diaz
Deposited On:03 Jun 2020 16:19
Last Modified:03 Jun 2020 16:19

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