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HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star

N. Heidari, I. Boisse, J. Orell-Miquel, G. Hébrard, L. Acuña, N. Hara, J. Lillo-Box, J. D. Eastman, L. Arnold, N. Astudillo-Defru, V. Zh. Adibekyan, A. Bieryla, X. Bonfils, F. Bouchy, T. Barclay, C. E. Brasseur, S. Borgniet, V. Bourrier, L. A. Buchhave, A. Behmard, C. Beard, N. Batalha, B. Courcol, P. Cortes-Zuleta, K. A. Collins, A. Carmona, I. J. M. Crossfield, A. Chontos, X. Delfosse, S. Dalal, M. Deleuil, O. Demangeon, R. F. Díaz, X. Dumusque, T. Daylan, D. Dragomir, E. Delgado Mena, C. D. Dressing, F. Dai, P. A. Dalba, D. Ehrenreich, T. Forveille, B. J. Fulton, T. Fetherolf, G. Gaisné, S. Giacalone, N. Riazi, S. Hoyer, M. J. Hobson, A. W. Howard, D. Huber, M. L. Hill, L. A. Hirsch, H. Isaacson, J. M. Jenkins, S. R. Kane, F. Kiefer, R. Luque, D. W. Latham, J. Lubin, T. A. Lopez, O. Mousis, C. Moutou, G. Montagnier, L. Mignon, A. W. Mayo, T. Močnik, Joseph M. A. Murphy, E. Palle, F. Pepe, E. Petigura, J. Rey, G. R. Ricker, P. Robertson, A. Roy, R. A. Rubenzahl, L. J. Rosenthal, A. Santerne, N. C. Santos, S. G. Sousa, K. G. Stassun, M. Stalport, N. Scarsdale, P. A. Strøm, S. Seager, D. Segransan, P. Tenenbaum, R. Tronsgaard, S. Udry, R. K. Vanderspek, F. Vakili, J. N. Winn, L. M. Weiss

We present the discovery and characterization of a transiting sub-Neptune that orbits the nearby (28 pc) and bright (V = 8.37) K0V star HD 207897 (TOI-1611) with a 16.20-day period. This discovery is based on photometric measurements from the Transiting Exoplanet Survey Satellite mission and radial velocity (RV) observations from the SOPHIE, Automated Planet Finder, and HIRES high-precision spectrographs. We used EXOFASTv2 to model the parameters of the planet and its host star simultaneously, combining photometric and RV data to determine the planetary system parameters. We show that the planet has a radius of 2.50 ± 0.08 RE and a mass of either 14.4 ± 1.6 ME or 15.9 ± 1.6 ME with nearly equal probability. The two solutions correspond to two possibilities for the stellar activity period. The density accordingly is either 5.1 ± 0.7 g cm−3 or 5.5−0.7+0.8 g cm−3, making it one of the relatively rare dense sub-Neptunes. The existence of this dense planet at only 0.12 AU from its host star is unusual in the currently observed sub-Neptune (2 < RE < 4) population. The most likely scenario is that this planet has migrated to its current position.

Astrophysics - Earth and Planetary Astrophysics

Astronomy & Astrophysics
Volume 658, Article Number A176, Number of pages 17
2022 February

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia