An international scientific team led by researchers at the Instituto de Astrofísica de Canarias (IAC) has discovered the presence of two planets with Earth-like masses in orbit around the star GJ 1002, a red dwarf not far from the Solar System. Both planets are in the habitability zone of the star
of their star. GJ 1002b, the inner of the two, takes little more than 10 days to complete an orbit around the star, while GJ 1002c needs a little over 21 days. “GJ 1002 is a red dwarf star, with barely one-eighth the mass of the Sun. It is quite a cool, faint star. This means that its habitability zone is very close to the star” explains Vera María Passegger, a co-author of the article and an IAC researcher.
The proximity of the star to our Solar System implies that the two planets, especially GJ 1002c, are excellent candidates for the characterization of their atmospheres based either on their reflected light, or on their thermal emission. “The future ANDES spectrograph for the ELT telescope atin which the IAC is participating, could study the presence of oxygen in the atmosphere of GJ 1002c” notes Jonay I. González Hernández, an IAC researcher who is a co-author of the article.
Infographic comparing the relative distance between the discovered planets and their star with the inner planets of the Solar System. The region marked in green represents the habitable zone of the two planetary systems. Credit: Design: Alejandro Suárez Mascareño . Planets of the Solar System: NASA The discovery was made during a collaboration between the consortia of the two instruments ESPRESSO and CARMENES. GJ 1002 was observed by CARMENES between 2017 and 2019, and by ESPRESSO between 2019 and 2021. “Because of its low temperature the visible light from GJ 1002 is too faint to measure its variations in velocity with the majority of spectrographs,” says Ignasi Ribas, researcher at the Institute of Space Sciences and director of the.
Reference: “Two temperate Earth-mass planets orbiting the nearby star GJ 1002” by A. Suárez Mascareño, E. González-Alvarez, M. R. Zapatero Osorio, J. Lillo-Box, J. P. Faria, V. M. Passegger, J. I. González Hernández, P. Figueira, S. Sozzetti, R. Rebolo, F. Pepe, N. C. Santos, S. Cristiani, C. Lovis, A. M. Silva, I. Ribas, et al., Accepted on 21 November 2022,
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