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DOI10.1051/0004-6361/200913737
NACO-SDI imaging of known companion host stars from the AAPS and Keck planet search surveys
Jenkins, J. S.1; Jones, H. R. A.2; Biller, B.3; O’Toole, S. J.4; Pinfield, D. J.2; Close, L.5; Tinney, C. G.6; Butler, R. P.7; Wittenmyer, R.6; Carter, B.8; Day-Jones, A. C.1
通讯作者Jenkins, J. S.
来源期刊ASTRONOMY & ASTROPHYSICS
ISSN0004-6361
出版年2010
卷号515
英文摘要

Context. Direct imaging of brown dwarfs as companions to solar-type stars can provide a wealth of well-constrained data to "bench-mark" the physics of such objects, since quantities like metallicity and age can be determined from their well-studied primaries.


Aims. We present results from an adaptive optics imaging program on stars drawn from the Anglo-Australian and Keck Planet Search projects, with the aim of directly imaging known cool companions.


Methods. Simulations have modeled the expected contrast ratios and separations of known companions using estimates of orbital parameters available from current radial-velocity data and then a selection of the best case objects were followed-up with high contrast imaging to attempt to directly image these companions.


Results. These simulations suggest that only a very small number of radial-velocity detected exoplanets with consistent velocity fits and age estimates could potentially be directly imaged using the VLT’s Simultaneous Differential Imaging system and only under favorable conditions. We also present detectability confidence limits from the radial-velocity data sets and show how these can be used to gain a better understanding of these systems when combined with the imaging data.


For HD32778 and HD91204 the detectabilities help little in constraining the companion and hence almost all our knowledge is drawn from the SDI images. Therefore, we can say that these stars do not host cool methane objects, out to on-sky separations of similar to 2", with contrasts less than 10-11 mag. However, for HD25874, HD120780 and HD145825, the contrasts and detectabilities can rule out a number of possible solutions, particularly at low angular separations, and for the best case, down to strong methane masses of 40 M(J) at 1" separation. The contrast curves constructed for these five stars show 5 sigma contrasts (Delta F1) of similar to 9.2-11.5 mag at separations of <= 0.6", which correspond to contrasts of similar to 9.7-12.0 mag for companions of mid-T spectral type. Such limits allow us to reach down to 40 M(J) around fairly old field dwarfs that typically constitute high precision radial-velocity programs. Finally, the analysis performed here can serve as a template for future projects that will employ extreme-AO systems to directly image planets already indirectly discovered by the radial-velocity method.


英文关键词binaries: general binaries: spectroscopic planetary systems stars: imaging technique: radial velocities techniques: high angular resolution
类型Article
语种英语
国家Chile ; England ; USA ; Australia
收录类别SCI-E
WOS记录号WOS:000278399000017
WOS关键词BROWN DWARF DESERT ; SIMULTANEOUS DIFFERENTIAL IMAGER ; EXTRASOLAR GIANT PLANETS ; SOLAR-TYPE STARS ; RADIAL-VELOCITIES ; SOUTHERN STARS ; COOL STARS ; EXOPLANETS ; CATALOG ; MULTIPLICITY
WOS类目Astronomy & Astrophysics
WOS研究方向Astronomy & Astrophysics
来源机构University of Arizona
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/163321
作者单位1.Univ Chile, Dept Astron, Santiago, Chile;
2.Univ Hertfordshire, Ctr Astrophys, Hatfield AL10 9AB, Herts, England;
3.Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA;
4.Anglo Australian Observ, Epping, NSW 1710, Australia;
5.Univ Arizona, Steward Observ, Tucson, AZ 85721 USA;
6.Univ New S Wales, Dept Astrophys & Opt, Sydney, NSW 2052, Australia;
7.Carnegie Inst Washington, Dept Terr Magnetism, Washington, DC 20015 USA;
8.Univ So Queensland, Fac Sci, Toowoomba, Qld 4350, Australia
推荐引用方式
GB/T 7714
Jenkins, J. S.,Jones, H. R. A.,Biller, B.,et al. NACO-SDI imaging of known companion host stars from the AAPS and Keck planet search surveys[J]. University of Arizona,2010,515.
APA Jenkins, J. S..,Jones, H. R. A..,Biller, B..,O’Toole, S. J..,Pinfield, D. J..,...&Day-Jones, A. C..(2010).NACO-SDI imaging of known companion host stars from the AAPS and Keck planet search surveys.ASTRONOMY & ASTROPHYSICS,515.
MLA Jenkins, J. S.,et al."NACO-SDI imaging of known companion host stars from the AAPS and Keck planet search surveys".ASTRONOMY & ASTROPHYSICS 515(2010).
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