Broad-band spectrophotometry of the hot Jupiter HAT-P-12b from the near-UV to the near-IR
| Autor: | Giampaolo Piotto, Gaetano Scandariato, I. Bernt, E. Herrero, J. Weingrill, M. Mallonn, Thomas Granzer, Klaus G. Strassmeier, Tom Marsh, C. von Essen, Isabella Pagano, Sz. Csizmadia, Valerio Nascimbeni, Pedro V. Sada, A. Künstler, V. S. Dhillon |
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| Přispěvatelé: | ITA, GBR, DEU, ESP, DNK, MEX |
| Rok vydání: | 2015 |
| Předmět: |
STELLAR ACTIVITY
BLUE SKY FOS: Physical sciences PHYSICAL-PROPERTIES Astrophysics MULTICOLOR PHOTOMETRY individual: HAT-P-12b [planets and satellites] Hot Jupiter LARGE BINOCULAR TELESCOPE TRANSMISSION SPECTRUM Transit (astronomy) Spectral resolution planetary systems Solar and Stellar Astrophysics (astro-ph.SR) Earth and Planetary Astrophysics (astro-ph.EP) PLANETARY SYSTEM SATURN Physics Stellar rotation Starspot EXOPLANET HD 189733B Astronomy and Astrophysics atmospheres [planets and satellites] Light curve TRANSIT TIMING VARIATIONS Exoplanet Photometry (astronomy) Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics::Earth and Planetary Astrophysics Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | Mallonn, M, Nascimbeni, V, Weingrill, J, von Essen, C, Strassmeier, K G, Piotto, G, Pagano, I, Scandariato, G, Csizmadia, S, Herrero, E, Sada, P V, Dhillon, V S, Marsh, T R, Künstler, A, Bernt, I & Granzer, T 2015, ' Broad-band spectrophotometry of the hot Jupiter HAT-P-12b from the near-UV to the near-IR ', Astronomy & Astrophysics, vol. 583, A138 . https://doi.org/10.1051/0004-6361/201425395 |
| ISSN: | 1432-0746 0004-6361 |
| DOI: | 10.1051/0004-6361/201425395 |
| Popis: | 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. 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. 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. Comment: 13 pages, 6 figures, Accepted for publication in A&A |
| Databáze: | OpenAIRE |
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