Detection of He I lambda 10830 angstrom absorption on HD 189733 b with CARMENES high-resolution transmission spectroscopy
文献类型：期刊论文
| 作者 | Salz, M.1; Czesla, S.1; Schneider, P. C.1; Nagel, E.1; Schmitt, J. H. M. M.1; Nortmann, L.2,3; Alonso-Floriano, F. J.4; Lopez-Puertas, M.5; Lampon, M.5; Bauer, F. F.5,6 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2018-12-07 |
| 卷号 | 620页码:13 |
| 关键词 | planets and satellites: atmospheres planets and satellites: individual: HD 189773 b planet-star interactions infrared: planetary systems stars: activity techniques: spectroscopic |
| ISSN号 | 1432-0746 |
| DOI | 10.1051/0004-6361/201833694 |
| 通讯作者 | Salz, M.(msalz@hs.uni-hamburg.de) |
| 英文摘要 | We present three transit observations of HD 189733 b obtained with the high-resolution spectrograph CARMENES at Calar Alto. A strong absorption signal is detected in the near-infrared He I triplet at 10830 angstrom in all three transits. During mid-transit, the mean absorption level is 0.88 +/- 0.04% measured in a +/- 10 km s(-1) range at a net blueshift of -3.5 +/- 0.4 km s(-1) (10829.84-10830.57 angstrom). The absorption signal exhibits radial velocities of +6.5 +/- 3.1 km s(-1) and -12.6 +/- 1.0 km s(-1) during ingress and egress, respectively; all radial velocities are measured in the planetary rest frame. We show that stellar activity related pseudo-signals interfere with the planetary atmospheric absorption signal. They could contribute as much as 80% of the observed signal and might also affect the observed radial velocity signature, but pseudo-signals are very unlikely to explain the entire signal. The observed line ratio between the two unresolved and the third line of the He i triplet is 2.8 +/- 0.2, which strongly deviates from the value expected for an optically thin atmospheres. When interpreted in terms of absorption in the planetary atmosphere, this favors a compact helium atmosphere with an extent of only 0.2 planetary radii and a substantial column density on the order of 4 x 10(12) cm(2). The observed radial velocities can be understood either in terms of atmospheric circulation with equatorial superrotation or as a sign of an asymmetric atmospheric component of evaporating material. We detect no clear signature of ongoing evaporation, like pre- or post-transit absorption, which could indicate material beyond the planetary Roche lobe, or radial velocities in excess of the escape velocity. These findings do not contradict planetary evaporation, but only show that the detected helium absorption in HD 189733 b does not trace the atmospheric layers that show pronounced escape signatures. |
| WOS关键词 | EXTRASOLAR PLANET ; X-RAY ; ESCAPING ATMOSPHERE ; STELLAR ACTIVITY ; HELIUM ; EXOPLANETS ; EXOSPHERE ; HUBBLE ; HAZE ; ULTRAVIOLET |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000452483300001 |
| 出版者 | EDP SCIENCES S A |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/20569]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Salz, M. |
| 作者单位 | 1.Univ Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany 2.Inst Astrofis Canarias, Via Lactea S-N, Tenerife 38205, Spain 3.Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain 4.Leiden Univ, Leiden Observ, Postbus 9513, NL-2300 RA Leiden, Netherlands 5.CSIC, IAA, Glorieta Astron S-N, E-18008 Granada, Spain 6.Georg August Univ, Inst Astrophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany 7.CSIC, INTA, Ctr Astrobiol, ESAC Campus,Camino Bajo del Castillo S-N, Madrid, Spain 8.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany 9.Chinese Acad Sci, Key Lab Planetary Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 10.Heidelberg Univ, Zentrum Astron, Landessternwarte, Konigstuhl 12, D-69117 Heidelberg, Germany |
| 推荐引用方式 GB/T 7714 | Salz, M.,Czesla, S.,Schneider, P. C.,et al. Detection of He I lambda 10830 angstrom absorption on HD 189733 b with CARMENES high-resolution transmission spectroscopy[J]. ASTRONOMY & ASTROPHYSICS,2018,620:13. |
| APA | Salz, M..,Czesla, S..,Schneider, P. C..,Nagel, E..,Schmitt, J. H. M. M..,...&Zechmeister, M..(2018).Detection of He I lambda 10830 angstrom absorption on HD 189733 b with CARMENES high-resolution transmission spectroscopy.ASTRONOMY & ASTROPHYSICS,620,13. |
| MLA | Salz, M.,et al."Detection of He I lambda 10830 angstrom absorption on HD 189733 b with CARMENES high-resolution transmission spectroscopy".ASTRONOMY & ASTROPHYSICS 620(2018):13. |
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来源：紫金山天文台
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