III Simposio de Postgrado 2025: Ingeniería, ciencia e innovación

Módulo Astronomía y Física 01 40 *E-mail: harshitha@das.uchile.cl ¹ Departamento de Astronomía, Universidad de Chile ² Instituto de Astrofísica, Pontificia Universidad Catolica de Chile Harshitha M Parashivamurthy ¹* Gijs D Mulders ² TESS Insights into the Impact of Stellar Mass on the Exoplanet Radius Valley __Referencias [1] Fulton, B. J., Petigura, E. A., Howard, A. W., et al. 2017, The Astronomical Journal, 154, 109 [2] Ricker, G. R., Winn, J. N., Vanderspek, R., et al. 2015, Journal of Astronomical Telescopes, Instruments, and Systems, 1, 014003 [3] Parashivamurthy &Mulders, 2025 (Resubmitted, Under review) [4] Venturini, Ronco, M. P., Guilera, O. M., et al. 2024, AA, 686, L9 Low-mass stars or M dwarfs provide a valuable opportunity to study the formation of Earths and super-Earths. NASA’s Kepler survey discovered that M dwarfs host more small transiting planets compared to sun-like stars. Exoplanet demographics revealed a lack of planets around 1.7 Earth radii, known as the radius valley [1] around sun-like stars. The Transiting Exoplanet Survey Satellite(TESS) [2] mission has observed ten times more low-mass stars, significantly enhancing planet detections around M dwarfs; therefore, providing us the motivation to look into planet formation around M dwarfs. For my research, I used the confirmed and candidate planets from TESS to look for the radius valley among the M dwarfs. I also observed that the radius valley shrinks to a smaller radius with decreasing stellar mass, consistent with Kepler observations [3] . This linear dependence between the planet size and its host star suggests that the planet formation and evolution of planets around Sun-like stars, also extend to M dwarfs. The detection of the radius valley around lower mass M dwarfs allows for a more detailed analysis between the planet size and stellar mass. The evidence we found of a flatter scaling than predicted before, is more consistent with pebble accretion models that include exoplanet water worlds [4] . These results indicate that low mass stars provide an excellent testing ground for testing different mechanisms of planet formation. Abstract