VLT FORS2 COMPARATIVE TRANSMISSION SPECTROSCOPY: DETECTION OF Na IN THE ATMOSPHERE OF WASP-39b FROM THE GROUND

被引：86

作者：

Nikolov, Nikolay ^{[1
]}

Sing, David K. ^{[1
]}

Gibson, Neale P. ^{[2
]}

Fortney, Jonathan J. ^{[3
]}

Evans, Thomas M. ^{[1
]}

Barstow, Joanna K. ^{[4
]}

Kataria, Tiffany ^{[5
]}

Wilson, Paul A. ^{[6
]}

机构：

[1] Univ Exeter, Phys & Astron, Exeter EX4 4QL, Devon, England

[2] Queens Univ Belfast, Sch Math & Phys, Astrophys Res Ctr, Belfast BT7 1NN, Antrim, North Ireland

[3] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA

[4] UCL, Phys & Astron, London, England

[5] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA USA

[6] Univ Paris 06, CNRS, Inst Astrophys Paris, UMR7095, 98bis Blvd Arago, F-75014 Paris, France

来源：

ASTROPHYSICAL JOURNAL | 2016年 / 832卷 / 02期

基金：

欧洲研究理事会;

关键词：

planets and satellites: atmospheres; stars: individual (WASP-39); techniques: photometric; techniques: spectroscopic; HUBBLE-SPACE-TELESCOPE; LIMB-DARKENING COEFFICIENTS; HOT-JUPITER WASP-19B; EXOPLANET GJ 1214B; HD; 189733B; EXTRASOLAR PLANET; SPECTRAL SURVEY; SODIUM; MODEL; WATER;

D O I：

10.3847/0004-637X/832/2/191

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present transmission spectroscopy of the warm Saturn-mass exoplanet WASP-39b made with the Very. Large. Telescope. FOcal Reducer. and. Spectrograph. (FORS2) across the wavelength range 411-810 nm. The transit depth is measured with a typical precision of 240 parts per million (ppm) in wavelength bins of 10 nm on a V = 12.1 mag star. We detect the sodium absorption feature (3.2 sigma) and find evidence of potassium. The ground-based transmission spectrum is consistent with Hubble Space Telescope (HST) optical spectroscopy, supporting the interpretation that WASP-39b has a largely clear atmosphere. Our results demonstrate the great potential of the recently upgraded FORS2 spectrograph for optical transmission spectroscopy, with which we obtained HST-quality light curves from the ground.

引用

页数：9

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