The Dusty, Solar Type Spectroscopic Binary BD +20 307
Abstract
The dustiest known main‐sequence star, BD +20 307, is actually a double‐lined binary with a period of 3.4202 days and a circular orbit. The system is also metal poor with [Fe/H] = −0.4. The components are late‐F and early‐G dwarfs and have a mass ratio of 1.07. The photometric period of about 3.5 days indicates that the components are synchronously rotating. The metal poor, binary nature invalidates the idea that the object is a very young single star with a warm planet‐making dust disk. Instead, the metal poor nature of the system and the lithium abundances of the components argue that the system is likely several billion years old, and so the dust disk results from the recent collision of two planetary mass rocky objects. Thus, BD +20 307 may well be the first known system with planets orbiting a close binary star.
Additional Information
© 2009 American Institute of Physics. Published online 16 February 2009. This research was supported in part by NASA through a Chandra Observatory award to UCLA. Automated astronomy at Tennessee State University is supported by NASA, NSF, Tennessee State University, and the State of Tennessee through its Centers of Excellence program.Attached Files
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- Eprint ID
- 66687
- Resolver ID
- CaltechAUTHORS:20160505-105815810
- NASA
- NSF
- Tennessee State University
- State of Tennessee
- Created
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2016-05-05Created from EPrint's datestamp field
- Updated
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2021-11-11Created from EPrint's last_modified field
- Caltech groups
- Space Radiation Laboratory
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- AIP Conference Proceedings
- Series Volume or Issue Number
- 1094