Space and Planetary Science; Astronomy and Astrophysics
Abstract :
[en] Abstract
The variability induced by precipitable water vapour (PWV) can heavily affect the accuracy of time-series photometric measurements gathered from the ground, especially in the near-infrared. We present here a novel method of modelling and mitigating this variability, as well as open-sourcing the developed tool – Umbrella. In this study, we evaluate the extent to which the photometry in three common bandpasses (r′, i′, z′), and SPECULOOS’ primary bandpass (I+z′), are photometrically affected by PWV variability. In this selection of bandpasses, the I+z′ bandpass was found to be most sensitive to PWV variability, followed by z′, i′, and r′. The correction was evaluated on global light curves of nearby late M- and L-type stars observed by SPECULOOS’ Southern Observatory (SSO) with the I+z′ bandpass, using PWV measurements from the LHATPRO and local temperature/humidity sensors. A median reduction in RMS of 1.1 per cent was observed for variability shorter than the expected transit duration for SSO’s targets. On timescales longer than the expected transit duration, where long-term variability may be induced, a median reduction in RMS of 53.8 per cent was observed for the same method of correction.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Pedersen, Peter P; Cavendish Laboratory , JJ Thomson Avenue, Cambridge CB3 0HE, UK
Murray, C A; Cavendish Laboratory , JJ Thomson Avenue, Cambridge CB3 0HE, UK ; Department of Astrophysical and Planetary Sciences, University of Colorado Boulder , 2000 Colorado Ave, Boulder, CO 80309, USA
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)
Demory, B O; University of Bern, Center for Space and Habitability , Gesellschaftsstrasse 6, 3012 Bern, Switzerland
Triaud, A H M J ; School of Physics and Astronomy, University of Birmingham , Edgbaston, Birmingham B15 2TT, United Kingdom
de Wit, J; Department of Earth, Atmospheric and Planetary Sciences , MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
Delrez, Laetitia ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization
Dransfield, G; School of Physics and Astronomy, University of Birmingham , Edgbaston, Birmingham B15 2TT, United Kingdom
Ducrot, E; AIM, CEA, CNRS, Université Paris-Saclay, Université de Paris , F-91191 Gif-sur-Yvette, France
Garcia, Lionel ; Université de Liège - ULiège > Astrobiology
Chew, Y Gómez Maqueo; Instituto de Astronomía, Universidad Nacional Autónoma de México, Ciudad Universitaria , Ciudad de México, 04510, México
Günther, M N; European Space Agency (ESA), European Space Research and Technology Centre (ESTEC) , Keplerlaan 1, 2201 AZ Noordwijk, the Netherlands
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
McCormac, J; Department of Physics, University of Warwick , Coventry, CV4 7AL, UK
Niraula, P; Department of Earth, Atmospheric and Planetary Sciences , MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
Pozuelos, F J; Astrobiology Research Unit, University of Liège , Allée du 6 août, 19, 4000 Liège (Sart-Timan), Belgium ; Space sciences, Technologies and Astrophysics Research (STAR) Institute, University of Liège , Belgium
Rackham, B V ; Department of Earth, Atmospheric and Planetary Sciences , MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA ; Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
Schanche, N; University of Bern, Center for Space and Habitability , Gesellschaftsstrasse 6, 3012 Bern, Switzerland
Sebastian, Daniel ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization ; School of Physics and Astronomy, University of Birmingham , Edgbaston, Birmingham B15 2TT, United Kingdom
Thompson, S J; Cavendish Laboratory , JJ Thomson Avenue, Cambridge CB3 0HE, UK
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