Reference : Early 2017 observations of TRAPPIST-1 with Spitzer
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/228494
Early 2017 observations of TRAPPIST-1 with Spitzer
English
Delrez, L. mailto [Cavendish Laboratory, JJ Thomson Avenue, Cambridge, United Kingdom]
Gillon, Michaël mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Triaud, A. H. M. J. [School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, United Kingdom]
Demory, B.-O. [Center for Space and Habitability, University of Bern, Gesellschaftsstrasse 6, Bern, Switzerland]
de Wit, J. [Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, United States]
Ingalls, J. G. [IPAC, California Institute of Technology, 1200 E California Boulevard, Mail Code 314-6, Pasadena, CA, United States]
Agol, E. [Astronomy Department, University of Washington, Seattle, WA, United States, NASA Astrobiology Institute's Virtual Planetary Laboratory, Seattle, WA, United States]
Bolmont, E. [IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France, Université Paris Diderot, AIM, Sorbonne Paris Cité, CEA, CNRS, Gif-sur-Yvette, France]
Burdanov, Artem mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Burgasser, A. J. [Center for Astrophysics and Space Science, University of California San Diego, La Jolla, CA, United States]
Carey, S. J. [IPAC, California Institute of Technology, 1200 E California Boulevard, Mail Code 314-6, Pasadena, CA, United States]
Jehin, Emmanuel mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Leconte, J. [Laboratoire d'astrophysique de Bordeaux, Univ. Bordeaux, CNRS, B18N, Allée Geoffroy Saint-Hilaire, Pessac, France]
Lederer, S. [NASA Johnson Space Center, 2101 NASA Parkway, Houston, TX, United States]
Queloz, D. [Cavendish Laboratory, JJ Thomson Avenue, Cambridge, United Kingdom]
Selsis, F. [Laboratoire d'astrophysique de Bordeaux, Univ. Bordeaux, CNRS, B18N, Allée Geoffroy Saint-Hilaire, Pessac, France]
Van Grootel, Valérie mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
2018
Monthly Notices of the Royal Astronomical Society
Oxford University Press
475
3
3577-3597
Yes (verified by ORBi)
International
00358711
[en] Planetary systems ; Stars: individual: TRAPPIST-1 ; Techniques: photometric
[en] The recently detected TRAPPIST-1 planetary system, with its seven planets transiting a nearby ultracool dwarf star, offers the first opportunity to perform comparative exoplanetology of temperate Earth-sized worlds. To further advance our understanding of these planets' compositions, energy budgets, and dynamics, we are carrying out an intensive photometric monitoring campaign of their transits with the Spitzer Space Telescope. In this context, we present 60 new transits of the TRAPPIST-1 planets observed with Spitzer/Infrared Array Camera (IRAC) in 2017 February and March. We combine these observations with previously published Spitzer transit photometry and perform a global analysis of the resulting extensive data set. This analysis refines the transit parameters and provides revised values for the planets' physical parameters, notably their radii, using updated properties for the star. As part of our study, we also measure precise transit timings that will be used in a companion paper to refine the planets' masses and compositions using the transit timing variations method. TRAPPIST-1 shows a very low level of low-frequency variability in the IRAC 4.5-μmband, with a photometric RMS of only 0.11 per cent at a 123-s cadence. We do not detect any evidence of a (quasi-)periodic signal related to stellar rotation. We also analyse the transit light curves individually, to search for possible variations in the transit parameters of each planet due to stellar variability, and find that the Spitzer transits of the planets are mostly immune to the effects of stellar variations. These results are encouraging for forthcoming transmission spectroscopy observations of the TRAPPIST-1 planets with the James Webb Space Telescope. © 2018 The Author(s).
NSF, National Science Foundation; 336480; ARC, Australian Research Council; SPIRE 647383; PP00P2_163967; 327127, Simons Foundation; NASA, National Aeronautics and Space Administration; ERC, European Research Council; Gruber Foundation; 679030; ERC, European Research Council; SNF, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung; JPL, Jet Propulsion Laboratory; Caltech, California Institute of Technology
http://hdl.handle.net/2268/228494
10.1093/mnras/sty051

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