Contributors: Institute of Geophysics ETH Zürich; Department of Earth Sciences Swiss Federal Institute of Technology - ETH Zürich (D-ERDW); Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich)-Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich); Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research (MPS); Max-Planck-Gesellschaft; Department of Earth, Ocean and Atmospheric Sciences Vancouver (UBC EOAS); University of British Columbia (UBC); Jet Propulsion Laboratory (JPL); NASA-California Institute of Technology (CALTECH); Planetary Science Institute Tucson (PSI); Space Science Institute Boulder (SSI); Institut de Physique du Globe de Paris (IPGP (UMR_7154)); Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité); Johns Hopkins University Applied Physics Laboratory Laurel, MD (APL); German Aerospace Center (DLR); Department of Earth and Planetary Sciences Santa Cruz; University of California Santa Cruz (UC Santa Cruz); University of California (UC)-University of California (UC); Laboratoire de Météorologie Dynamique (UMR 8539) (LMD); Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris; École normale supérieure - Paris (ENS-PSL); Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL); Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL); Institut Pierre-Simon-Laplace (IPSL (FR_636)); Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité); Institut Universitaire de France (IUF); Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.); Cornell Center for Astrophysics and Planetary Science (CCAPS); Cornell University New York; Department of Electrical and Electronic Engineering London (DEEE); Imperial College London; Swiss Seismological Service ETH Zurich (SED); Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich)-Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich)-Department of Earth Sciences Swiss Federal Institute of Technology - ETH Zürich (D-ERDW); Karlsruhe Institute of Technology (KIT); We acknowledge NASA, CNES, partner agencies and institutions (UKSA, SSO, DLR, JPL, IPGP‐CNRS, ETHZ, IC, and MPS‐MPG), and the operators of JPL, SISMOC, MSDS, IRIS‐DMC, and PDS for providing SEED SEIS data. French teams acknowledge support from CNES as well as Agence Nationale de la Recherche (ANR‐14‐CE36‐0012‐02 and ANR‐19‐CE31‐0008‐08). The Swiss contribution in implementation of the SEIS electronics was made possible through funding from the federal Swiss Space Office (SSO) and the contractual and technical support of the ESA‐PRODEX office. The MPS‐MPG SEIS team acknowledges funding for development of the SEIS leveling system by the DLR German Space Agency. Numerical simulations were supported by a grant from the Swiss National Supercomputing Centre (CSCS) under project ID s922. A. M. and C. L. J. acknowledge partial support from the Canadian Space Agency. M. L., F. N., and R. L. acknowledge partial support from the InSight PSP program under Grants 80NSSC18K1621, 80NSSC18K1627, and 80NSSC18K162; ANR-14-CE36-0012,SEISMARS,Seismology on Mars(2014); ANR-19-CE31-0008,MAGIS,MArs Geophysical InSight(2019)
نبذة مختصرة : International audience ; Since landing on Mars, the NASA InSight lander has witnessed eight Phobos and one Deimos transits. All transits could be observed by a drop in the solar array current and the surface temperature, but more surprisingly, for several ones, a clear signature was recorded with the seismic sensors and the magnetometer. We present a preliminary interpretation of the seismometer data as temperature‐induced local deformation of the ground, supported by terrestrial analog experiments and finite‐element modeling.The magnetic signature is most likely induced by changing currents from the solar arrays. While the observations are not fully understood yet, the recording of transit‐related phenomena with high sampling rate will allow more precise measurements of the transit times, thus providing additional constraints for the orbital parameters of Phobos. The response of the seismometer can potentially also be used to constrain the thermoelastic properties of the shallow regolith at the landing site.
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