Astrometric follow-up observations of directly imaged sub-stellar companions to young stars and brown dwarfs
Astrometric follow-up observations of directly imaged sub-stellar companions to young stars and brown dwarfs
复制标题
对年轻恒星和褐矮星直接成像的亚恒星伴星的天体测量后续观测
DOI:
10.1093/mnras/stu1586
复制
发表时间:
2014
影响因子:
4.8
通讯作者:
Berndt A.
中科院分区:
文献类型:
--
作者:
Ginski C;Schmidt T.O.B;Mugrauer M;Neuhäuser R;Vogt N;Errmann R;Berndt A.
The formation of massive planetary or brown dwarf companions at large projected separations from their host star is not yet well understood. In order to put constraints on formation scenarios, we search for signatures in the orbit dynamics of the systems. We are specifically interested in the eccentricities and inclinations since those parameters might tell us about the dynamic history of the systems and where to look for additional low-mass sub-stellar companions. For this purpose, we utilized VLT/NACO to take several well-calibrated high-resolution images of six target systems and analyse them together with available literature data points of those systems as well asHubble Space Telescopearchival data. We used a statistical least-squares Monte Carlo approach to constrain the orbit elements of all systems that showed significant differential motion of the primary star and companion. We show for the first time that the GQ Lup system shows significant change in both separation and position angle. Our analysis yields best-fitting orbits for this system, which are eccentric (e between 0.21 and 0.69), but cannot rule out circular orbits at high inclinations. Given our astrometry, we discuss formation scenarios of the GQ Lup system. In addition, we detected an even fainter new companion candidate to GQ Lup, which is most likely a background object. We also updated the orbit constraints of the PZ Tel system, confirming that the companion is on a highly eccentric orbit withe> 0.62. Finally, we show with a high significance, that there is no orbital motion observed in the cases of the DH Tau, HD 203030 and 1RXS J160929.1−210524 systems, and give the most precise relative astrometric measurement of the UScoCTIO 108 system to date.
登录
查看更多内容
DOI:
--
发表时间:
2003
期刊:
Astrophysical J. 590
影响因子:
--
作者:
Fukagawa;M. 他
通讯作者:
M. 他
DOI:
--
发表时间:
1991
期刊:
影响因子:
--
作者:
O. Eggen
通讯作者:
O. Eggen
影响因子:
6.5
作者:
T. Schmidt;M. Mugrauer;R. Neuhauser;N. Vogt;S. Witte;P. Hauschildt;C. Helling;A. Seifahrt;A. I. U. Universitatssternwarte;Jena;H Germany;D. D. Astronom'ia-D.;Valpara'iso;Chile.;H. Sternwarte;S. O. Physics;Astronomy;S. Andrews;UK.;D. O. Astronomy;Astrophysics;Chicago.;Usa
通讯作者:
T. Schmidt;M. Mugrauer;R. Neuhauser;N. Vogt;S. Witte;P. Hauschildt;C. Helling;A. Seifahrt;A. I. U. Universitatssternwarte;Jena;H Germany;D. D. Astronom'ia-D.;Valpara'iso;Chile.;H. Sternwarte;S. O. Physics;Astronomy;S. Andrews;UK.;D. O. Astronomy;Astrophysics;Chicago.;Usa
DOI:
10.1051/0004-6361/201118410
发表时间:
2012
期刊:
arXiv: Solar and Stellar Astrophysics
影响因子:
--
作者:
Vogt N;Schmidt T.O.B;Neuhäuser R;Bedalov A;Roell T;Seifahrt A;Mugrauer M.
通讯作者:
Mugrauer M.
DOI:
--
发表时间:
2001
期刊:
影响因子:
--
作者:
Thomas L. Hayward;B. Brandl;B. Pirger;C. Blacken;G. Gull;J. Schoenwald;J. Houck
通讯作者:
J. Houck