Marko Sestovic
A5019221760- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
University of Bern
2017-2021
University of Cambridge
2018
Abstract We have collected transit times for the TRAPPIST-1 system with Spitzer Space Telescope over four years. add to these ground-based, HST, and K2 transit-time measurements, revisit an N -body dynamical analysis of seven-planet using our complete set from which we refine mass ratios planets star. next carry out a photodynamical light curves derive density host star planet densities. find that all seven planets’ densities may be described single rocky mass–radius relation is depleted in...
Context. The TRAPPIST-1 system hosts seven Earth-sized, temperate exoplanets orbiting an ultra-cool dwarf star. As such, it represents a remarkable setting to study the formation and evolution of terrestrial planets that formed in same protoplanetary disk. While sizes are all known better than 5% precision, their densities have significant uncertainties (between 28% 95%) because poor constraints on planet's masses. Aims.The goal this paper is improve our knowledge planetary masses using...
As of today, hundreds hot Jupiters have been found, yet the inflated radii a large fraction them remain unexplained. It is still unclear whether single inflation mechanism enough to explain entire distribution radii, or combination needed. We seek understand relationship Jupiter with stellar irradiation and mass. also aim find intrinsic physical scatter in their caused by unobservable parameters. By constructing hierarchical Bayesian model, we infer probabilistic relation between planet...
We report the discovery and characterisation of a super-Earth sub-Neptune transiting bright ( K = 8.8), quiet, nearby (37 pc) M3V dwarf TOI-1266. validate planetary nature TOI-1266 b c using four sectors TESS photometry data from newly-commissioned 1-m SAINT-EX telescope located in San Pedro Mártir (México). also include additional ground-based follow-up as well high-resolution spectroscopy high-angular imaging observations. The inner, larger planet has radius R 2.37 −0.12 +0.16 ⊕ an orbital...
The TRAPPIST-1 planetary system represents an exceptional opportunity for the atmospheric characterization of temperate terrestrial exoplanets with upcoming James Webb Space Telescope (JWST). Assessing potential impact stellar contamination on planets' transit transmission spectra is essential precursor step to this characterization. Planetary transits themselves can be used scan photosphere and constrain its heterogeneity through depth variations in time wavelength. In context, we present...
With the discovery of a planetary system around TRAPPIST-1, there has been surge interest in ultracool dwarfs as potential planet hosts. Planetary systems represent our best chance characterising temperate rocky-planet atmospheres with JWST. However, TRAPPIST-1 remains only known its kind, and occurrence rate planets is still poorly constrained. We seek to perform complete transit search on observed by NASA's K2 mission constrain these stars. filter characterise sample K2, fitting their...
Despite the existence of co-orbital bodies in solar system, and prediction formation planets by planetary system models, no exoplanets (also called trojans) have been detected thus far. Here we study signature transit surveys when two planet candidates orbit star with similar periods. Such pair could be discarded as false positives because they are not Hill-stable. However, horseshoe or long libration period tadpole configurations can explain such similarity. This degeneracy solved...
We have collected transit times for the TRAPPIST-1 system with Spitzer Space Telescope over four years. add to these ground-based, HST and K2 time measurements, revisit an N-body dynamical analysis of seven-planet using our complete set from which we refine mass ratios planets star. next carry out a photodynamical light curves derive density host star planet densities. find that all seven planets' densities may be described single rocky mass-radius relation is depleted in iron relative...