planets and satellites: fundamental parameters; planets and satellites: terrestrial planets; stars: activity; stars: late-type; stars: magnetic field
Abstract :
[en] We apply the transit light curve self-contamination technique of Morris et al. to search for the effect of stellar activity on the transits of the ultracool dwarf TRAPPIST-1 with 2018 Spitzer photometry. The self-contamination method fits the transit light curves of planets orbiting spotted stars, allowing the host star to be a source of contaminating positive or negative flux that influences the transit depths but not the ingress/egress durations. We find that none of the planets show statistically significant evidence for self-contamination by bright or dark regions of the stellar photosphere. However, we show that small-scale magnetic activity, analogous in size to the smallest sunspots, could still be lurking undetected in the transit photometry.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Morris, Brett M. ; Astronomy Department, University of Washington, Seattle, WA 98195, USA
Agol, Eric ; Astronomy Department and Virtual Planetary Laboratory, University of Washington, Seattle, WA 98195, USA
Hebb, Leslie ; Physics Department, Hobart and William Smith Colleges, Geneva, NY 14456, USA
Hawley, Suzanne L. ; Astronomy Department and Virtual Planetary Laboratory, University of Washington, Seattle, WA 98195, USA
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Ducrot, Elsa ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
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