First spectroscopic observations of the substellar companion of the young debris disk star PZ Telescopii
First spectroscopic observations of the substellar companion of the young debris disk star PZ Telescopii
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DOI：
10.1051/0004-6361/201321625
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发表时间：
2014-04
影响因子：
6.5
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
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文献类型：
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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
上下文2010年，两个团队通过高对比度直接成像发现了太阳前主序星星星PZ Tel的一颗亚恒星伴星，它是大约1200万年前的β Pic移动群的成员。目标。为了更精确地确定这颗伴星的基本参数，并且独立于演化模型，因此与年龄无关，我们获得了主星和伴星的后续光谱观测。方法.我们使用光谱仪在近红外线（SINFONI）在甚大望远镜单元4/Yepun的欧洲南方天文台的帕拉纳天文台在H + K波段和处理的数据使用光谱解卷积技术。然后，使用χ 2最小化分析，将产生的伴星光谱与漂移-凤凰合成模型光谱的网格进行比较，漂移-凤凰合成模型光谱是通用模型大气代码与非平衡、静止云和尘埃模型的组合。结果我们发现PZ Tel A的最佳拟合光谱类型为G6.5。在与早期轨道估计一致的空间位置处，提取的亚恒星伴星的光谱产生温度Teff = 2500 + 138
Context. In 2010 a substellar companion to the solar analog pre-main sequence star PZ Tel and member of the approximately 12 Myr old β Pic moving group was found by high-contrast direct imaging independently by two teams. Aims. In order to determine the basic parameters of this companion more precisely and independent of evolutionary models, hence age-independent, we obtained follow-up spectroscopic observations of the primary and companion. Methods. We used the Spectrograph for INtegral Field Observations in the Near Infrared (SINFONI) at the Very Large Telescope Unit 4/Yepun of ESO’s Paranal Observatory in the H + K band and processed the data using the spectral deconvolution technique. The resulting spectrum of the companion was then compared to a grid of Drift-Phoenix synthetic model spectra, a combination of a general-purpose model atmosphere code with a non-equilibrium, stationary cloud and dust model, using a χ 2 minimization analysis. Results. We find a best fitting spectral type of G6.5 for PZ Tel A. The extracted spectrum of the substellar companion, at a spatial position compatible with earlier orbit estimates, yields a temperature Teff = 2500 +138