Year: 2023
Type: article
Abstract: We report the discovery, mass, and radius determination of TOI-1801 b, a temperate mini-Neptune around a young M dwarf. TOI-1801 b was observed in TESS sectors 22 and 49, and the alert that this was a TESS planet candidate with a period of 21.3 days went out in April 2020. However, ground-based follow-up observations, including seeing-limited photometry in and outside transit together with precise radial velocity (RV) measurements with CARMENES and HIRES revealed that the true period of the planet is 10.6 days. These observations also allowed us to retrieve a mass of 5.74 ± 1.46M⊕, which together with a radius of 2.08 ± 0.12R⊕, means that TOI-1801 b is most probably composed of water and rock, with an upper limit of 2% by mass of H2in its atmosphere. The stellar rotation period of 16 days is readily detectable in our RV time series and in the ground-based photometry. We derived a likely age of 600–800 Myr for the parent star TOI-1801, which means that TOI-1801 b is the least massive young mini-Neptune with precise mass and radius determinations. Our results suggest that if TOI-1801 b had a larger atmosphere in the past, it must have been removed by some evolutionary mechanism on timescales shorter than 1 Gyr.
Source: Astronomy and Astrophysics
Authors: M. Mallorquín, E. Goffo, E. Pallé, N. Lodieu, V. J. S. Béjar, H. Isaacson, M. R. Zapatero Osorio, S. Dreizler, S. Stock, R. Luque, F. Murgas, L. Peña, J. Sanz-Forcada, G. Morello, D. R. Ciardi, E. Furlan, K. A. Collins, E. Herrero, S. Vanaverbeke, P. Plavchan, N. Narita, A. Schweitzer, M. Pérez-Torres, A. Quirrenbach, J. Kemmer, A. P. Hatzes, A. Howard, M. Schlecker, S. Reffert, E. Nagel, J. C. Morales, J. Orell-Miquel, C. Duque-Arribas, I. Carleo, C. Cifuentes, G. Nowak, I. Ribas, A. Reiners, P. J. Amado, J. A. Caballero, Th. Henning, V. Pinter, J. M. Akana Murphy, C. Beard, S. Blunt, C. L. Brinkman, B. Cale, A. Chontos, K. I. Collins, I. J. M. Crossfield, F. Dai, P. A. Dalba, S. Dufoer, M. El Mufti, N. Espinoza, T. Fetherolf, A. Fukui, S. Giacalone, C. Gnilka, E. Gonzales, S. K. Grunblatt, S. Howell, D. Huber, S. R. Kane, J. P. de León, J. Lubin, M. G. MacDougall, B. Massey, D. Montes, M. Mori, H. Parviainen, V. M. Passegger, A. S. Polanski, P. Robertson, R. P. Schwarz, G. Srdoc, H. M. Tabernero, A. Tanner, E. Turtelboom, J. Van Zandt, L. Weiss, M. Zechmeister
Institutions: Universidad de La Laguna, Instituto de Astrofísica de Canarias, Thüringer Landessternwarte Tautenburg, University of Turin, University of Oklahoma, University of California, Berkeley, University of Göttingen, Heidelberg University, University of Chicago, California Institute of Technology, NASA Exoplanet Science Institute, George Mason University, Universidad Complutense de Madrid, Institute of Space Sciences, Institut d'Estudis Espacials de Catalunya, University of California, Riverside, University of Hawaiʻi at Mānoa, University of Hawaii System, Infrared Processing and Analysis Center, Princeton University, University of Kansas, University of California, Santa Cruz, Space Telescope Science Institute, Komaba Institute for Science, The University of Tokyo, The University of Tokyo, Johns Hopkins University, Ames Research Center, The University of Sydney, University of California, Irvine, University of California, Los Angeles, Center for Astrophysics Harvard & Smithsonian, Centro de Astrobiología, Mississippi State University, University of Notre Dame
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,623
Funders: National Science Foundation, National Aeronautics and Space Administration, Alfred P. Sloan Foundation, California Institute of Technology, Heising-Simons Foundation, European Space Agency, Deutsche Forschungsgemeinschaft, Swedish National Space Agency, Universidad Complutense de Madrid, Ministerio de Economía y Competitividad, Ministry of Science, ICT and Future Planning, Nuclear Safety and Security Commission, Korea Astronomy and Space Science Institute, Max-Planck-Gesellschaft, Uniwersytet Mikolaja Kopernika w Toruniu, Klaus Tschira Stiftung, Junta de Andalucía, Ministério da Ciência, Tecnologia, Inovações e Comunicações, Instituto de Astrofísica de Andalucía, Agencia Nacional de Investigación y Desarrollo, Max-Planck-Institut für Astronomie, Instituto de Astrofísica de Canarias, Ames Research Center, Science Mission Directorate, Japan Society for the Promotion of Science, Consejo Superior de Investigaciones Científicas, European Regional Development Fund, Integrated Electronics Engineering Center, Binghamton University, Core Research for Evolutional Science and Technology
Awards: G1877798660, G1966014972, Collaborative Research: MINERVA - A dedicated, global, precision radial velocity machine for TESS, G2627485041, G2633884080, G2637833645, Precise Near-Infrared Motion Velocities of Stars, G3613734281, G4148867738, G4190160184, G4430987133, G4502305455, G4819157200, G5089749489, G5293249294, G5397736686, G5580121929, G5613623313, G6686480456, G6718509927, G6731467812, G7578079922, G7719629023, G7959475314, G8662767329, G8739736297
OpenAlex ID: W4387600697