Spot Modeling through Multiband Photometry Analysis of V1298 Tau

TL;DR

This study models stellar spots on V1298 Tau using multiband photometry to determine their size, temperature, and contribution to stellar activity, aiding in noise reduction for exoplanet observations.

Contribution

It introduces a method to extract geometric and thermal properties of stellar spots from multiband photometry of young active stars.

Findings

Constrained the temperature of active regions on V1298 Tau.

Validated the method using solar data to measure active region size and temperature.

Demonstrated the importance of modeling stellar activity for exoplanet studies.

Abstract

Context. Stellar activity consists of different phenomena, mainly spots and faculae, and it is one of the main sources of noise in exoplanetary observations because it affects both spectroscopic and photometric observations. If we want to study young active planetary systems we need to model the activity of the host stars in order to remove astrophysical noise from our observational data. Aims. We modelled the contribution of stellar spots in photometric observations. Through the use of multiband photometry, we aim to extract the geometric properties of the spots and constrain their temperature. Methods. We analyzed multiband photometric observations acquired with the 80 cm Marcon telescope of the Osservatorio Polifunzionale del Chianti of V1298 Tau, assuming that the photometric modulation observed in different bands should be due to cold spots. Results. We constrained the effective temperature of the active regions present on the surface of V1298 Tau, which is composed by the contemporary presence of spots and faculae. We tested our hypothesis on solar data, verifying that we measure the size of the dominant active region and its averaged effective temperature.