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The GTC exoplanet transit spectroscopy survey V. A spectrally-resolved Rayleigh scattering slope in GJ 3470b
Chen, G.1,2,3; Guenther, E. W.1,4; Palle, E.1,2; Nortmann, L.1,2; Nowak, G.1,2; Kunz, S.4; Parviainen, H.1,2; Murgas, F.1,2
2017-04-01
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN1432-0746
Volume600Pages:12
Corresponding AuthorChen, G.(gchen@iac.es)
AbstractAims. As a sub-Uranus-mass low-density planet, GJ 3470b has been found to show a flat featureless transmission spectrum in the infrared and a tentative Rayleigh scattering slope in the optical. We conducted an optical transmission spectroscopy project to assess the impacts of stellar activity and to determine whether or not GJ 3470b hosts a hydrogen-rich gas envelop. Methods. We observed three transits with the low-resolution Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy (OSIRIS) at the 10.4 m Gran Telescopio Canarias, and one transit with the high-resolution Ultraviolet and Visual Echelle Spectrograph (UVES) at the 8.2 m Very Large Telescope. Results. From the high-resolution data, we find that the difference of the Ca II H+K lines in-and out-of-transit is only 0 : 67 +/- 0 : 22%, and determine a magnetic filling factor of about 10-15%. From the low-resolution data, we present the first optical transmission spectrum in the 435-755 nm band, which shows a slope consistent with Rayleigh scattering. Conclusions. After exploring the potential impacts of stellar activity in our observations, we confirm that Rayleigh scattering in an extended hydrogen-helium atmosphere is currently the best explanation. Further high-precision observations that simultaneously cover optical and infrared bands are required to answer whether or not clouds and hazes exist at high-altitude.
Keywordplanetary systems planets and satellites: individual: GJ 3470b planets and satellites: atmospheres techniques: spectroscopic
DOI10.1051/0004-6361/201630228
WOS KeywordHUBBLE-SPACE-TELESCOPE ; FLAT TRANSMISSION SPECTRUM ; EXTRASOLAR PLANET ; LIGHT CURVES ; HD 189733B ; MODEL ATMOSPHERES ; THERMAL EMISSION ; STELLAR ACTIVITY ; WATER-VAPOR ; BLUE SKY
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000400754000133
PublisherEDP SCIENCES S A
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23103
Collection中国科学院紫金山天文台
Corresponding AuthorChen, G.
Affiliation1.Inst Astrofis Canarias, Via Lactea S-N, Tenerife 38205, Spain
2.Univ La Laguna, Dept Astrofis, San Cristobal la Laguna, Spain
3.Chinese Acad Sci, Purple Mt Observ, Key Lab Planetary Sci, Nanjing 210008, Jiangsu, Peoples R China
4.Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany
Recommended Citation
GB/T 7714
Chen, G.,Guenther, E. W.,Palle, E.,et al. The GTC exoplanet transit spectroscopy survey V. A spectrally-resolved Rayleigh scattering slope in GJ 3470b[J]. ASTRONOMY & ASTROPHYSICS,2017,600:12.
APA Chen, G..,Guenther, E. W..,Palle, E..,Nortmann, L..,Nowak, G..,...&Murgas, F..(2017).The GTC exoplanet transit spectroscopy survey V. A spectrally-resolved Rayleigh scattering slope in GJ 3470b.ASTRONOMY & ASTROPHYSICS,600,12.
MLA Chen, G.,et al."The GTC exoplanet transit spectroscopy survey V. A spectrally-resolved Rayleigh scattering slope in GJ 3470b".ASTRONOMY & ASTROPHYSICS 600(2017):12.
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