Reference : Refining the transit timing and photometric analysis of TRAPPIST-1: Masses, radii, de...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/256346
Refining the transit timing and photometric analysis of TRAPPIST-1: Masses, radii, densities, dynamics, and ephemerides
English
Agol, Eric [> >]
Dorn, Caroline [> >]
Grimm, Simon L. [> >]
Turbet, Martin [> >]
Ducrot, Elsa mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Delrez, Laetitia mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Gillon, Michaël mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Demory, Brice-Olivier [> >]
Burdanov, Artem [> >]
Barkaoui, Khalid mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Benkhaldoun, Zouhair [> >]
Bolmont, Emeline [> >]
Burgasser, Adam [> >]
Carey, Sean [> >]
de Wit, Julien [> >]
Fabrycky, Daniel [> >]
Foreman-Mackey, Daniel [> >]
Haldemann, Jonas [> >]
Hernandez, David M. [> >]
Ingalls, James [> >]
Jehin, Emmanuel mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Langford, Zachary [> >]
Leconte, Jeremy [> >]
Lederer, Susan M. [> >]
Luger, Rodrigo [> >]
Malhotra, Renu [> >]
Meadows, Victoria S. [> >]
Morris, Brett M. [> >]
Pozuelos, Francisco J. [> >]
Queloz, Didier [> >]
Raymond, Sean M. [> >]
Selsis, Franck [> >]
Sestovic, Marko [> >]
Triaud, Amaury H. M. J. [> >]
Van Grootel, Valérie mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
22-Jan-2021
Planetary Science Journal
IOP Publishing
2
1
Yes (verified by ORBi)
International
2632-3338
Philadelphia
PA
[en] Astrophysics - Earth and Planetary Astrophysics
[en] We have collected transit times for the TRAPPIST-1 system with the Spitzer Space Telescope over four years. We add to these ground-based, HST and K2 transit time measurements, and revisit an N-body dynamical analysis of the seven-planet system using our complete set of times from which we refine the mass ratios of the planets to the star. We next carry out a photodynamical analysis of the Spitzer light curves to derive the density of the host star and the planet densities. We find that all seven planets' densities may be described with a single rocky mass-radius relation which is depleted in iron relative to Earth, with Fe 21 wt% versus 32 wt% for Earth, and otherwise Earth-like in composition. Alternatively, the planets may have an Earth-like composition, but enhanced in light elements, such as a surface water layer or a core-free structure with oxidized iron in the mantle. We measure planet masses to a precision of 3-5%, equivalent to a radial-velocity (RV) precision of 2.5 cm/sec, or two orders of magnitude more precise than current RV capabilities. We find the eccentricities of the planets are very small; the orbits are extremely coplanar; and the system is stable on 10 Myr timescales. We find evidence of infrequent timing outliers which we cannot explain with an eighth planet; we instead account for the outliers using a robust likelihood function. We forecast JWST timing observations, and speculate on possible implications of the planet densities for the formation, migration and evolution of the planet system.
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/256346
10.3847/PSJ/abd022
https://ui.adsabs.harvard.edu/abs/2020arXiv201001074A

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