Simulations of starspot anomalies within TESS exoplanetary transit light curves -- I. The detection limits of starspot anomalies in TESS light curves

Abstract

20573 simulations of planetary transits around spotted stars were conducted using the transit-starspot model, \texttt{PRISM}. In total 3888 different scenarios were considered using three different host star spectral types, M4V, M1V and K5V. The mean amplitude of the starspot anomaly was measured and compared to the photometric precision of the light curve, to determine if the starspot anomaly's characteristic "blip" was noticeable in the light curve. The simulations show that, starspot anomalies will be observable in TESS 2\,min cadence data. The smallest starspot detectable in TESS transit light curves has a radius of $\approx 1900$\,km. The starspot detection limits for the three host stars are: $4900\pm 1700$\,km (M4V), $13800\pm 6000$\,km (M1V) and $15900\pm 6800$\,km (K5V). The smallest change in flux of the starspot ($\Delta F_{\mathrm{spot}}=0.00015\pm 0.00001$) can be detected when the ratio between the planetary and stellar radii, $k=0.082\pm 0.004$. The results confirm known dependencies between the amplitude of the starspot anomaly and the photometric parameters of the light curve. The results allowed the characterisation of the relationship between the change in flux of the starspot anomaly and the change in flux of the planetary transit for TESS transit light curves.

arXiv comment24 Pages, 12 Figures. Accepted for publication in A&A, section 10. Planets and planetary systems

References in corpus (55)

• The Transiting Exoplanet Survey Satellite
• The Dartmouth Stellar Evolution Database
• Habitable Zones Around Main-Sequence Stars: New Estimates
• Planetary Radii across Five Orders of Magnitude in Mass and Stellar Insolation: Application to Transits
• A Computational Guide to Physics of Eclipsing Binaries. Paper I. Demonstrations and Perspectives
• The TESS Input Catalog and Candidate Target List
• The Occurrence Rate of Small Planets around Small Stars
• Stellar Diameters and Temperatures II. Main Sequence K & M Stars
• Homogeneous studies of transiting extrasolar planets. IV. Thirty systems with space-based light curves
• The Transiting Exoplanet Survey Satellite: Simulations of planet detections and astrophysical false positives
• Eclipsing binaries in open clusters. II. V453 Cyg in NGC 6871
• Homogeneous studies of transiting extrasolar planets. I. Light curve analyses
• Physics Of Eclipsing Binaries. II. Towards the Increased Model Fidelity
• Limb and gravity-darkening coefficients for the TESS satellite at several metallicities, surface gravities, and microturbulent velocities
• Homogeneous studies of transiting extrasolar planets. III. Additional planets and stellar models
• Starspots, spin-orbit misalignment, and active latitudes in the HAT-P-11 exoplanetary system
• Alignment of the stellar spin with the orbits of a three-planet system
• TESS Discovery of a Transiting Super-Earth in the $\pi$ Mensae System
• Characterizing the Cool KOIs II. The M Dwarf KOI-254 and its Hot Jupiter
• Starspots and spin-orbit alignment in the WASP-4 exoplanetary system
• The Radius Distribution of Planets Around Cool Stars
• TESS Discovery of an ultra-short-period planet around the nearby M dwarf LHS 3844
• Kepler-63b: A Giant Planet in a Polar Orbit around a Young Sun-like Star
• ELLC - a fast, flexible light curve model for detached eclipsing binary stars and transiting exoplanets
• Absolute dimensions of detached eclipsing binaries. I. The metallic-lined system WW Aurigae
• HATS-6b: A Warm Saturn Transiting an Early M Dwarf Star, and a Set of Empirical Relations for Characterizing K and M Dwarf Planet Hosts
• The solar-type eclipsing binary system LL Aquarii
• Transits and starspots in the WASP-19 planetary system
• Eclipsing binaries observed with the WIRE satellite. II. beta Aurigae and non-linear limb darkening in light curves
• Physical properties of the 0.94-day period transiting planetary system WASP-18
• Properties of starspots on CoRoT-2
• NGTS-1b: A hot Jupiter transiting an M-dwarf
• Physical properties, transmission and emission spectra of the WASP-19 planetary system from multi-colour photometry
• HD 202772A B: A Transiting Hot Jupiter Around A Bright, Mildly Evolved Star In A Visual Binary Discovered By Tess
• spotrod: a semi-analytic model for transits of spotted stars
• Multiwavelength flux variations induced by stellar magnetic activity: effects on planetary transits
• The Next Generation Transit Survey (NGTS)
• TESS delivers its first Earth-sized planet and a warm sub-Neptune
• Starspot distributions on fully convective M dwarfs: implications for radial velocity planet searches
• Modelling the photosphere of active stars for planet detection and characterization
• A cool starspot or a second transiting planet in the TrES-1 system?
• Transits and starspots in the WASP-6 planetary system
• SOAP-T: A tool to study the light-curve and radial velocity of a system with a transiting planet and a rotating spotted star
• Orbital alignment and starspot properties in the WASP-52 planetary system
• On the relationship between the size and surface coverage of starspots on magnetically active low-mass stars
• Physical properties, starspot activity, orbital obliquity, and transmission spectrum of the Qatar-2 planetary system from multi-colour photometry
• HATS-2b: A transiting extrasolar planet orbiting a K-type star showing starspot activity
• The GAPS Programme with HARPS-N at TNG VIII: Observations of the Rossiter-McLaughlin effect and characterisation of the transiting planetary systems HAT-P-36 and WASP-11/HAT-P-10
• Improvements on analytic modelling of stellar spots
• The GTC exoplanet transit spectroscopy survey. VI. A spectrally-resolved Rayleigh scattering slope in GJ 3470b
• Activity and rotation of Kepler-17
• $\text{PyTranSpot}$ - A tool for multiband light curve modeling of planetary transits and stellar spots
• High-precision photometry by telescope defocussing. VIII. WASP-22, WASP-41, WASP-42 and WASP-55
• Refined physical properties and g',r',i',z',J,H,K transmission spectrum of WASP-23b from the ground
• Possible detection of a bimodal cloud distribution in the atmosphere of HAT-P-32\,A\,b from multi-band photometry

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