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Measuring the Temperature of Starspots from Multi-Filter Photometry by Schutte, Maria C.; Hebb, Leslie; Wisniewski, John P.; Canas, Caleb I.; Libby-Roberts, Jessica E.; Lin, Andrea S. J.; Robertson, Paul; Stefansson, Gudmundur is a scholarly article available to read on EtoBox.

What is Measuring the Temperature of Starspots from Multi-Filter Photometry about?

Using simultaneous multi-filter observations during the transit of an exoplanet around a K dwarf star, we determine the temperature of a starspot through modeling the radius and position with wavelength-dependent spot contrasts. We model the spot using the starspot modeling program STarSPot (STSP), which uses the transiting companion as a knife-edge probe of the stellar surface. The contrast of the spot, i.e. the ratio of the integrated flux of a darker spot region to the star's photosphere, is calculated for a range of filters and spot temperatures. We demonstrate this technique using simulated data of HAT-P-11, a K dwarf (T = 4780 K) with well-modeled starspot properties for which we obtained simultaneous multi-filter transits using LCO's MuSCAT3 instrument on the 2-meter telescope at Haleakala Observatory which allows for simultaneous, multi-filter, diffuser assisted high-precision photometry. We determine the average (i.e. a combination of penumbra and umbra) spot temperature for HAT-P-11's spot complexes is 4500 K $\pm$ 100 K using this technique. We also find for our set of filters that comparing the SDSS g' and i' filters maximizes the signal difference caused by a large spo

Author

Schutte, Maria C.; Hebb, Leslie; Wisniewski, John P.; Canas, Caleb I.; Libby-Roberts, Jessica E.; Lin, Andrea S. J.; Robertson, Paul; Stefansson, Gudmundur

Published

2023

Language

EN