CaltechAUTHORS
  A Caltech Library Service

Planetary Systems around Close Binary Stars: The Case of the Very Dusty, Sun-like, Spectroscopic Binary BD+20 307

Zuckerman, B. and Fekel, Francis C. and Williamson, Michael H. and Henry, Gregory W. and Muno, M. P. (2008) Planetary Systems around Close Binary Stars: The Case of the Very Dusty, Sun-like, Spectroscopic Binary BD+20 307. Astrophysical Journal, 688 (2). pp. 1345-1351. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:ZUCapj08

[img]
Preview
PDF - Published Version
See Usage Policy.

402Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:ZUCapj08

Abstract

Field star BD+20 307 is the dustiest known main-sequence star, based on the fraction of its bolometric luminosity, 4%, that is emitted at infrared wavelengths. The particles that carry this large infrared luminosity are unusually warm, comparable to the temperature of the zodiacal dust in the solar system, and their existence is likely to be a consequence of a fairly recent collision of large objects such as planets or planetary embryos. Thus, the age of BD+20 307 is potentially of interest in constraining the era of terrestrial planet formation. The present project was initiated with an attempt to derive this age using the Chandra X-Ray Observatory to measure the X-ray flux of BD+20 307 in conjunction with extensive photometric and spectroscopic monitoring observations from Fairborn Observatory. However, the recent realization that BD+20 307 is a short-period, double-line, spectroscopic binary whose components have very different lithium abundances vitiates standard methods of age determination. We find the system to be metal-poor; this, combined with its measured lithium abundances, indicates that BD+20 307 may be several to many Gyr old. BD+20 307 affords astronomy a rare peek into a mature planetary system in orbit around a close binary star (because such systems are not amenable to study by the precision radial velocity technique).


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/592394DOIUNSPECIFIED
http://www.iop.org/EJ/abstract/0004-637X/688/2/1345/PublisherUNSPECIFIED
Additional Information:© 2008. The American Astronomical Society. We thank Inseok Song for a helpful conversation and Alycia Weinberger for calling the binary nature of BD+20 307 to our attention before publication. We thank the second referee for constructive comments. 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.
Funders:
Funding AgencyGrant Number
NASAUNSPECIFIED
NSFUNSPECIFIED
Tennessee State UniversityUNSPECIFIED
State of TennesseeUNSPECIFIED
Subject Keywords:planetary systems: formation; stars: individual (BD+20 307); stars: rotation; X-rays: stars
Record Number:CaltechAUTHORS:ZUCapj08
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:ZUCapj08
Official Citation:Planetary Systems around Close Binary Stars: The Case of the Very Dusty, Sun-like, Spectroscopic Binary BD+20 307 B. Zuckerman, Francis C. Fekel, Michael H. Williamson, Gregory W. Henry, and M. P. Muno 2008 ApJ 688 1345-1351 doi: 10.1086/592394
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12562
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:12 Dec 2008 23:38
Last Modified:26 Dec 2012 10:35

Repository Staff Only: item control page