MULTI-BAND, MULTI-EPOCH OBSERVATIONS OF THE TRANSITING WARM JUPITER WASP-80b

Fukui, A.; Kawashima, Yui; Ikoma, Masahiro; Narita, Norio; Onitsuka, Masahiro; Ita, Yoshifusa; Onozato, Hiroki; Nishiyama, Shogo; Baba, Haruka; Ryu, Tsuguru; Hirano, Teruyuki; Hori, Yasunori; Kurosaki, Kunihiko; Kawauchi, Kiyoe; Takahashi, Yasuhiro; Nagayama, Takahiro; Tamura, Motohide; Kawai, N.; Kuroda, D.; Nagayama, S.; Ohta, Kouji; Shimizu, Yasuhiro; Yanagisawa, K.; Yoshida, Michitoshi; Izumiura, Hideyuki

doi:10.1088/0004-637x/790/2/108

Cited by 51 publications

(34 citation statements)

References 54 publications

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“…We outline the numerical methods and the generic equations for the calculation of posterior probability densities in §2. We continue in §3 by carrying out a detailed joint modelling of three priorly observed broadband datasets described in Triaud et al (2013), Mancini et al (2014), andFukui et al (2014). The datasets cover 27 transit light curves observed in g , r , i , I, z , J, H, and K. We describe the GTC observations and data reduction in §4 , detail the analysis in §5, present the transmission spectroscopy results in §6, and discuss the results in §7.…”

Section: Arxiv:170901875v1 [Astro-phep] 6 Sep 2017mentioning

confidence: 99%

“…The observations cover the spectral range from 520 to 910 nm, probing the planet atmosphere for a possible Rayleigh scattering signal in the blue end of the spectrum, and the visible-light extinction features of the K I and Na I resonance doublets at 767 nm and 589.4 nm, respectively. WASP-80b (Triaud et al 2013;Mancini et al 2014;Fukui et al 2014;Triaud et al 2015, see also Table 1), a warm gas giant orbiting a bright (V=11.87) late-K / early-M dwarf on a 3.07 d orbit, was identified as a promising target for transmission spectroscopy from its discovery. The planet has a low surface gravity (M p = 0.56 M Jup , R p = 0.99R Jup , g = 14.34 ms −2 , Mancini et al 2014), and its large radius ratio leads to ∼3% deep transits, which, combined with the brightness of its host star, enhance our abilities to detect any possible transmission spectrum features.…”

Section: Arxiv:170901875v1 [Astro-phep] 6 Sep 2017mentioning

confidence: 99%

“…We estimate the posterior densities for the WASP-80b orbital parameters based on the three datasets observed by Mancini et al (2014), Triaud et al (2013), and Fukui et al (2014), abbreviated from herein as M14, T13, and F14, respectively. The datasets contain 27 light curves (Fig.…”

Section: Overviewmentioning

confidence: 99%

“…The T13 and M14 datasets, as obtained from VizieR, were detrended by their original authors, and do not include other information than the observation time, flux, and error estimates. The F14 dataset was kindly provided by the author without detrending, and included all the auxiliary information (such as the airmass, and x-and ycentroid shifts for each exposure) used in the original analysis presented in Fukui et al (2014).…”

Section: Overviewmentioning

confidence: 99%

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The GTC exoplanet transit spectroscopy survey

Parviainen

Pallé

Chen

et al. 2018

A&A

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Aims. We set out to study the atmosphere of WASP-80b, a warm inflated gas giant with an equilibrium temperature of ∼800 K, using ground-based transmission spectroscopy covering the spectral range from 520 to 910 nm. The observations allow us to probe the existence and abundance of K and Na in WASP-80b's atmosphere, existence of high-altitude clouds, and Rayleigh-scattering in the blue end of the spectrum. Methods. We observed two spectroscopic time series of WASP-80b transits with the OSIRIS spectrograph installed in the Gran Telescopio CANARIAS, and use the observations to estimate the planet's transmission spectrum between 520 nm and 910 nm in 20 nm-wide passbands, and around the K I and Na I resonance doublets in 6 nm-wide passbands. We model three previously published broadband datasets consisting of 27 light curves jointly prior to the transmission spectroscopy analysis in order to obtain improved prior estimates for the planet's orbital parameters, average radius ratio, and stellar density. The parameter posteriors from the broadband analysis are used to set informative priors on the transmission spectroscopy analysis. The final transmission spectroscopy analyses are carried out jointly for the two nights using a divide-by-white approach to remove the common-mode systematics and Gaussian processes to model the residual wavelength-dependent systematics. Results. We recover a flat transmission spectrum with no evidence of Rayleigh scattering or K I or Na I absorption, and obtain an improved system characterisation as a by-product of the broadband-and GTC-dataset modelling. The transmission spectra estimated separately from the two observing runs are consistent with each other, as are the transmission spectra estimated using either a parametric or nonparametric systematics models. The flat transmission spectrum favours an atmosphere model with high-altitude clouds over cloud-free models with stellar or sub-stellar metallicities. Conclusions. Our results disagree with the recently published discovery of strong K I absorption in WASP-80b's atmosphere based on ground-based transmission spectroscopy with FORS2 at VLT.

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Section: Arxiv:170901875v1 [Astro-phep] 6 Sep 2017mentioning

confidence: 99%

Section: Arxiv:170901875v1 [Astro-phep] 6 Sep 2017mentioning

confidence: 99%

Section: Overviewmentioning

confidence: 99%

Section: Overviewmentioning

confidence: 99%

See 2 more Smart Citations

The GTC exoplanet transit spectroscopy survey

Parviainen

Pallé

Chen

et al. 2018

A&A

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“…The achieved precision of the broad-band spectrophotometry papers of Bento et al (2014) and Mancini et al (2013a) did not yield significant results for the hot Jupiters WASP-17b and WASP-19b, but tentatively it was possible to favor a certain atmospheric model before the others. In contrast, there is a larger number of broad-band spectrophotometry investigations of hot Jupiters that did not reach the necessary precision to distinguish between atmospheric models (Southworth et al 2012;Nikolov et al 2013;Mancini et al 2013bMancini et al , 2014bCopperwheat et al 2013;Chen et al 2014;Fukui et al 2014;Zhou et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Broad-band spectrophotometry of the hot Jupiter HAT-P-12b from the near-UV to the near-IR

Mallonn

Nascimbeni

Weingrill

et al. 2015

A&A

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Context. The detection of trends or gradients in the transmission spectrum of extrasolar planets is possible with observations at very low spectral resolution. Transit measurements of sufficient accuracy using selected broad-band filters allow for an initial characterization of the atmosphere of the planet. Aims. We want to investigate the atmosphere of the hot Jupiter HAT-P-12b for an increased absorption at the very blue wavelength regions caused by scattering. Furthermore, we aim for a refinement of the transit parameters and the orbital ephemeris. Methods. We obtained time series photometry of 20 transit events and analyzed them homogeneously, along with eight light curves obtained from the literature. In total, the light curves span a range from 0.35 to 1.25 microns. During two observing seasons over four months each, we monitored the host star to constrain the potential influence of starspots on the derived transit parameters. Results. We rule out the presence of a Rayleigh slope extending over the entire optical wavelength range, a flat spectrum is favored for HAT-P-12b with respect to a cloud-free atmosphere model spectrum. A potential cause of such gray absorption is the presence of a cloud layer at the probed latitudes. Furthermore, in this work we refine the transit parameters, the ephemeris and perform a TTV analysis in which we found no indication for an unseen companion. The host star showed a mild non-periodic variability of up to 1%. However, no stellar rotation period could be detected to high confidence.

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The Exoplanet Handbook

Perryman¹

2018

177

149

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MULTI-BAND, MULTI-EPOCH OBSERVATIONS OF THE TRANSITING WARM JUPITER WASP-80b

Cited by 51 publications

References 54 publications

The GTC exoplanet transit spectroscopy survey

The GTC exoplanet transit spectroscopy survey

Broad-band spectrophotometry of the hot Jupiter HAT-P-12b from the near-UV to the near-IR

The Exoplanet Handbook

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