Reference : Ground-based follow-up observations of TRAPPIST-1 transits in the near-infrared
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/237500
Ground-based follow-up observations of TRAPPIST-1 transits in the near-infrared
English
Burdanov, Artem mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Lederer, S. M. [NASA Johnson Space Center, 2101 NASA Parkway, Houston, TX 77058, USA]
Gillon, Michaël mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Delrez, L. [Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0H3, UK]
Ducrot, Elsa mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
de Wit, J. [Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA]
Jehin, Emmanuel 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 & Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK]
Lidman, C. [The Research School of Astronomy and Astrophysics, Australian National University, ACT 2601, Australia]
Spitler, L. [Research Centre for Astronomy, Astrophysics & Astrophotonics, Macquarie University, Sydney, NSW 2109, Australia; Department of Physics & Astronomy, Macquarie University, Sydney, NSW 2109, Australia]
Demory, B.-O. [University of Bern, Center for Space and Habitability, Sidlerstrasse 5, CH-3012 Bern, Switzerland]
Queloz, D. [Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0H3, UK]
Van Grootel, Valérie mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
1-Aug-2019
Monthly Notices of the Royal Astronomical Society
487
1634-1652
Yes
International
[en] techniques: photometric ; planets and satellites: atmospheres ; stars: individual: TRAPPIST-1 ; infrared: planetary systems ; infrared: stars ; Astrophysics - Earth and Planetary Astrophysics ; Astrophysics - Solar and Stellar Astrophysics
[en] The TRAPPIST-1 planetary system is a favourable target for the atmospheric characterization of temperate earth-sized exoplanets by means of transmission spectroscopy with the forthcoming James Webb Space Telescope (JWST). A possible obstacle to this technique could come from the photospheric heterogeneity of the host star that could affect planetary signatures in the transit transmission spectra. To constrain further this possibility, we gathered an extensive photometric data set of 25 TRAPPIST-1 transits observed in the near-IR J band (1.2 μm) with the UKIRT and the AAT, and in the NB2090 band (2.1 μm) with the VLT during the period 2015-18. In our analysis of these data, we used a special strategy aiming to ensure uniformity in our measurements and robustness in our conclusions. We reach a photometric precision of 0.003 (RMS of the residuals), and we detect no significant temporal variations of transit depths of TRAPPIST-1 b, c, e, and g over the period of 3 yr. The few transit depths measured for planets d and f hint towards some level of variability, but more measurements will be required for confirmation. Our depth measurements for planets b and c disagree with the stellar contamination spectra originating from the possible existence of bright spots of temperature 4500 K. We report updated transmission spectra for the six inner planets of the system which are globally flat for planets b and g and some structures are seen for planets c, d, e, and f.
http://hdl.handle.net/2268/237500
10.1093/mnras/stz1375
https://ui.adsabs.harvard.edu/abs/2019MNRAS.487.1634B

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