ACCESS: Ground-based Optical Transmission Spectroscopy of the Hot Jupiter WASP-4b

被引：22

作者：

Bixel, Alex ^{[1
,2
]}

Rackham, Benjamin, V ^{[1
,2
]}

Apai, Daniel ^{[1
,2
,3
]}

Espinoza, Nestor ^{[4
,5
,6
]}

Lopez-Morales, Mercedes ^{[2
,7
]}

Osip, David ^{[8
]}

Jordan, Andres ^{[2
,4
,5
,6
]}

McGruder, Chima ^{[7
]}

Weaver, Ian ^{[7
]}

机构：

[1] Univ Arizona, Steward Observ, Dept Astron, 933 N Cherry Ave, Tucson, AZ 85721 USA

[2] NASA, Earths Other Solar Syst Team, Nexus Exoplanet Syst Sci, Washington, DC 20546 USA

[3] Univ Arizona, Lunar & Planetary Lab, 1640 E Univ Blvd, Tucson, AZ 85721 USA

[4] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[5] Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago 7820436, Chile

[6] Millennium Inst Astrophys, Av Vicuna Mackenna 4860, Santiago 7820436, Chile

[7] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 01238 USA

[8] Carnegie Inst Sci, Las Campanas Observ, Casilla 601, La Serena, Chile

来源：

ASTRONOMICAL JOURNAL | 2019年 / 157卷 / 02期

基金：

美国国家科学基金会;

关键词：

planets and satellites: atmospheres; planets and satellites: individual (WASP-4b); stars: activity; starspots; techniques: spectroscopic; EXOPLANET HD 189733B; EXTRASOLAR PLANET; ATMOSPHERIC HAZE; LIGHT CURVES; SPECTRA; MODEL; PARAMETERS; HUBBLE; PHOTOMETRY; TRANSITS;

D O I：

10.3847/1538-3881/aaf9a3

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present an optical transmission spectrum of the atmosphere of WASP-4b obtained through observations of four transits with Magellan/IMACS, as part of the Arizona-CfA-Catolica-Carnegie Exoplanet Spectroscopy Survey (ACCESS). Using a Bayesian approach to atmospheric retrieval, we find no evidence for scattering or absorption features in our transit spectrum. Our models include a component to model the transit light source effect (spectral contamination from unocculted spots on the stellar photosphere), which we show can have a marked impact on the observed transmission spectrum for reasonable spot-covering fractions (<5%); this is the first such analysis for WASP-4b. We are also able to fit for the size and temperature contrast of spots observed during the second and third transits, finding evidence for both small, cool and large, warm spot-like features on the photosphere. Finally, we compare our results to those published by Huitson et al. using Gemini/GMOS and May et al. using IMACS, and we find that our data are in agreement.

引用

页数：27

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