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TOI-283 b: A transiting mini-Neptune in a 17.6-day orbit discovered with TESS and ESPRESSO

Fuente: arXiv

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Main Authors:	Murgas, F., Pallé, E., Mascareño, A. Suárez, Korth, J., Pozuelos, F. J., Hobson, M. J., Lavie, B., Lovis, C., Sousa, S. G., Bossini, D., Parviainen, H., Castro-González, A., Adibekyan, V., Prieto, C. Allende, Alibert, Y., Bouchy, F., Briceño, C., Caldwell, D. A., Ciardi, D., Clark, C., Collins, K. A., Collins, K. I., Cristiani, S., Dumusque, X., Ehrenreich, D., Figueira, P., Furlan, E., Santos, R. Génova, Gnilka, C., Hernández, J. I. González, Hartman, Z., Howell, S. B., Jenkins, J. M., Law, N., Littlefield, C., Curto, G. Lo, Mann, A. W., Martins, C. J. A. P., Mehner, A., Micela, G., Molaro, P., Nunes, N. J., Pepe, F., Rebolo, R., Relles, H. M., Santos, N. C., Scott, N. J., Seager, S., Sozzetti, A., Udry, S., Watkins, C. N., Winn, J. N., Osorio, M. R. Zapatero, Ziegler, C.
Format:	Preprint
Published:	2025
Subjects:	Earth and Planetary Astrophysics Solar and Stellar Astrophysics
Online Access:	Acceder al recurso
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author	Murgas, F. Pallé, E. Mascareño, A. Suárez Korth, J. Pozuelos, F. J. Hobson, M. J. Lavie, B. Lovis, C. Sousa, S. G. Bossini, D. Parviainen, H. Castro-González, A. Adibekyan, V. Prieto, C. Allende Alibert, Y. Bouchy, F. Briceño, C. Caldwell, D. A. Ciardi, D. Clark, C. Collins, K. A. Collins, K. I. Cristiani, S. Dumusque, X. Ehrenreich, D. Figueira, P. Furlan, E. Santos, R. Génova Gnilka, C. Hernández, J. I. González Hartman, Z. Howell, S. B. Jenkins, J. M. Law, N. Littlefield, C. Curto, G. Lo Mann, A. W. Martins, C. J. A. P. Mehner, A. Micela, G. Molaro, P. Nunes, N. J. Pepe, F. Rebolo, R. Relles, H. M. Santos, N. C. Scott, N. J. Seager, S. Sozzetti, A. Udry, S. Watkins, C. N. Winn, J. N. Osorio, M. R. Zapatero Ziegler, C.
author_facet	Murgas, F. Pallé, E. Mascareño, A. Suárez Korth, J. Pozuelos, F. J. Hobson, M. J. Lavie, B. Lovis, C. Sousa, S. G. Bossini, D. Parviainen, H. Castro-González, A. Adibekyan, V. Prieto, C. Allende Alibert, Y. Bouchy, F. Briceño, C. Caldwell, D. A. Ciardi, D. Clark, C. Collins, K. A. Collins, K. I. Cristiani, S. Dumusque, X. Ehrenreich, D. Figueira, P. Furlan, E. Santos, R. Génova Gnilka, C. Hernández, J. I. González Hartman, Z. Howell, S. B. Jenkins, J. M. Law, N. Littlefield, C. Curto, G. Lo Mann, A. W. Martins, C. J. A. P. Mehner, A. Micela, G. Molaro, P. Nunes, N. J. Pepe, F. Rebolo, R. Relles, H. M. Santos, N. C. Scott, N. J. Seager, S. Sozzetti, A. Udry, S. Watkins, C. N. Winn, J. N. Osorio, M. R. Zapatero Ziegler, C.
contents	Super-Earths and mini-Neptunes are missing from our Solar System, yet they appear to be the most abundant planetary types in our Galaxy. A detailed characterization of key planets within this population is important for understanding the formation mechanisms of rocky and gas giant planets and the diversity of planetary interior structures. In 2019, NASA's TESS satellite found a transiting planet candidate in a 17.6-day orbit around the star TOI-283. We started radial velocity (RV) follow-up observations with ESPRESSO to obtain a mass measurement. Mass and radius are measurements critical for planetary classification and internal composition modeling. We used ESPRESSO spectra to derive the stellar parameters of the planet candidate host star TOI-283. We then performed a joint analysis of the photometric and RV data of this star, using Gaussian processes to model the systematic noise present in both datasets. We find that the host is a bright K-type star ($d = 82.4$ pc, $\mathrm{T}_\mathrm{eff} = 5213 \pm 70$ K, $V = 10.4$ mag) with a mass and radius of $\mathrm{M}_\star = 0.80 \pm 0.01\; \mathrm{M}_\odot$ and $\mathrm{R}_\star = 0.85 \pm 0.03\; \mathrm{R}_\odot$. The planet has an orbital period of $P = 17.617$ days, a size of $\mathrm{R}_\mathrm{p} = 2.34 \pm 0.09\; \mathrm{R}_\oplus$, and a mass of $\mathrm{M}_\mathrm{p} = 6.54 \pm 2.04\; \mathrm{M}_\oplus$. With an equilibrium temperature of $\sim$600 K and a bulk density of $ρ_\mathrm{p} = 2.81 \pm 0.93$ g cm$^{-3}$, this planet is positioned in the mass-radius diagram where planetary models predict H$_2$O- and H/He-rich envelopes. The ESPRESSO RV data also reveal a long-term trend that is probably related to the star's activity cycle. Further RV observations are required to confirm whether this signal originates from stellar activity or another planetary body in the system.
format	Preprint
id	arxiv_https___arxiv_org_abs_2510_15084
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	TOI-283 b: A transiting mini-Neptune in a 17.6-day orbit discovered with TESS and ESPRESSO Murgas, F. Pallé, E. Mascareño, A. Suárez Korth, J. Pozuelos, F. J. Hobson, M. J. Lavie, B. Lovis, C. Sousa, S. G. Bossini, D. Parviainen, H. Castro-González, A. Adibekyan, V. Prieto, C. Allende Alibert, Y. Bouchy, F. Briceño, C. Caldwell, D. A. Ciardi, D. Clark, C. Collins, K. A. Collins, K. I. Cristiani, S. Dumusque, X. Ehrenreich, D. Figueira, P. Furlan, E. Santos, R. Génova Gnilka, C. Hernández, J. I. González Hartman, Z. Howell, S. B. Jenkins, J. M. Law, N. Littlefield, C. Curto, G. Lo Mann, A. W. Martins, C. J. A. P. Mehner, A. Micela, G. Molaro, P. Nunes, N. J. Pepe, F. Rebolo, R. Relles, H. M. Santos, N. C. Scott, N. J. Seager, S. Sozzetti, A. Udry, S. Watkins, C. N. Winn, J. N. Osorio, M. R. Zapatero Ziegler, C. Earth and Planetary Astrophysics Solar and Stellar Astrophysics Super-Earths and mini-Neptunes are missing from our Solar System, yet they appear to be the most abundant planetary types in our Galaxy. A detailed characterization of key planets within this population is important for understanding the formation mechanisms of rocky and gas giant planets and the diversity of planetary interior structures. In 2019, NASA's TESS satellite found a transiting planet candidate in a 17.6-day orbit around the star TOI-283. We started radial velocity (RV) follow-up observations with ESPRESSO to obtain a mass measurement. Mass and radius are measurements critical for planetary classification and internal composition modeling. We used ESPRESSO spectra to derive the stellar parameters of the planet candidate host star TOI-283. We then performed a joint analysis of the photometric and RV data of this star, using Gaussian processes to model the systematic noise present in both datasets. We find that the host is a bright K-type star ($d = 82.4$ pc, $\mathrm{T}_\mathrm{eff} = 5213 \pm 70$ K, $V = 10.4$ mag) with a mass and radius of $\mathrm{M}_\star = 0.80 \pm 0.01\; \mathrm{M}_\odot$ and $\mathrm{R}_\star = 0.85 \pm 0.03\; \mathrm{R}_\odot$. The planet has an orbital period of $P = 17.617$ days, a size of $\mathrm{R}_\mathrm{p} = 2.34 \pm 0.09\; \mathrm{R}_\oplus$, and a mass of $\mathrm{M}_\mathrm{p} = 6.54 \pm 2.04\; \mathrm{M}_\oplus$. With an equilibrium temperature of $\sim$600 K and a bulk density of $ρ_\mathrm{p} = 2.81 \pm 0.93$ g cm$^{-3}$, this planet is positioned in the mass-radius diagram where planetary models predict H$_2$O- and H/He-rich envelopes. The ESPRESSO RV data also reveal a long-term trend that is probably related to the star's activity cycle. Further RV observations are required to confirm whether this signal originates from stellar activity or another planetary body in the system.
title	TOI-283 b: A transiting mini-Neptune in a 17.6-day orbit discovered with TESS and ESPRESSO
topic	Earth and Planetary Astrophysics Solar and Stellar Astrophysics
url	https://arxiv.org/abs/2510.15084