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|Title:||Large Binocular Telescope view of the atmosphere of GJ1214b||Authors:||NASCIMBENI, VALERIO
Strassmeier, K. G.
|Issue Date:||2015||Journal:||ASTRONOMY & ASTROPHYSICS||Number:||579||First Page:||A113||Abstract:||The atmospheric composition and vertical structure of the super-Earth GJ1214b has been a subject of debate since its discovery in 2009. Recent studies have indicated that high-altitude clouds might mask the lower layers. However, some data points that were gathered at different times and facilities do not fit this picture, probably because of a combination of stellar activity and systematic errors. We observed two transits of GJ1214b with the Large Binocular Camera, the dual-channel camera at the Large Binocular Telescope. For the first time, we simultaneously measured the relative planetary radius k = R<SUB>p</SUB>/R<SUB>⋆</SUB> at blue and red optical wavelengths (B + R), thus constraining the Rayleigh scattering on GJ1214b after correcting for stellar activity effects. To the same purpose, a long-term photometric follow-up of the host star was carried out with WiFSIP at STELLA, revealing a rotational period that is significantly longer than previously reported. Our new unbiased estimates of k yield a flat transmission spectrum extending to shorter wavelengths, thus confirming the cloudy atmosphere scenario for GJ1214b. Based on data acquired using the Large Binocular Telescope (LBT). The LBT is an international collaboration among institutions in the United States, Italy, and Germany. LBT Corporation partners are the University of Arizona on behalf of the Arizona university system; Istituto Nazionale di Astrofisica, Italy; LBT Beteiligungsgesellschaft, Germany, representing the Max-Planck Society, the Astrophysical Institute Potsdam, and Heidelberg University; the Ohio State University; and the Research Corporation, on behalf of the University of Notre Dame, University of Minnesota and University of Virginia. Partly based on STELLA WiFSIP data (Strassmeier et al. 2004).The data of the light curves are only available at the CDS via anonymous ftp to "http://cdsarc.u-strasbg.fr" (ftp://18.104.22.168) or via "http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/579/A113"||Acknowledgments:||We acknowledge the support from the LBT-Italian Coordination Facility for the execution of observations, data distribution and reduction. V. N. and G. P. acknowledge partial support by the Università di Padova through the “progetto di Ateneo #CPDA103591”. V. N. acknowledges partial support from INAF-OAPd through the grant “Analysis of HARPS-N data in the framework of GAPS project” (#19/2013) and “Studio preparatorio per le osservazioni della missione ESA/CHEOPS” (#42/2013). We thank Thomas Granzer for his extensive technical support with the STELLA monitoring campaign. Some tasks of our data analysis have been carried out with the VARTOOLS ( Hartman et al. 2008 ) and Astrometry.net codes ( Lang et al. 2010 ). This research has made use of the International Variable Star Index (VSX) database, operated at AAVSO, Cambridge, Massachusetts, USA. VN dedicates this paper to the memory of Renzo Nascimbeni (1942–2014).||URI:||http://hdl.handle.net/20.500.12386/23514||URL:||https://www.aanda.org/articles/aa/abs/2015/07/aa25350-14/aa25350-14.html||ISSN:||0004-6361||DOI:||10.1051/0004-6361/201425350||Bibcode ADS:||2015A&A...579A.113N||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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