A super-Earth and a sub-Neptune orbiting the bright, quiet M3 dwarf TOI-1266

Demory, B. -O. and Pozuelos, F. J. and Chew, Y. Gomez Maqueo and Sabin, L. and Petrucci, R. and Schroffenegger, U. and Grimm, S. L. and Sestovic, M. and Gillon, M. and McCormac, J. and Barkaoui, K. and Benz, W. and Bieryla, A. and Bouchy, F. and Burdanov, A. and Collins, K. A. and de Wit, J. and Dressing, C. D. and Garcia, L. J. and Giacalone, S. and Guerra, P. and Haldemann, J. and Heng, K. and Jehin, E. and Jofre, E. and Kane, S. R. and Lillo-Box, J. and Maigne, V. and Mordasini, C. and Morris, B. M. and Niraula, P. and Queloz, D. and Rackham, B. V. and Savel, A. B. and Soubkiou, A. and Srdoc, G. and Stassun, K. G. and Triaud, A. H. M. J. and Zambelli, R. and Ricker, G. and Latham, D. W. and Seager, S. and Winn, J. N. and Jenkins, J. M. and Calvario-Velasquez, T. and Franco Herrera, J. A. and Colorado, E. and Cadena Zepeda, E. O. and Figueroa, L. and Watson, A. M. and Lugo-Ibarra, E. E. and Carigi, L. and Guisa, G. and Herrera, J. and Sierra Diaz, G. and Suarez, J. C. and Barrado, D. and Batalha, N. M. and Benkhaldoun, Z. and Chontos, A. and Dai, F. and Essack, Z. and Ghachoui, M. and Huang, C. X. ORCID: https://orcid.org/0000-0003-0918-7484 and Huber, D. and Isaacson, H. and Lissauer, J. J. and Morales-Calderon, M. and Robertson, P. and Roy, A. and Twicken, J. D. and Vanderburg, A. and Weiss, L. M. (2020) A super-Earth and a sub-Neptune orbiting the bright, quiet M3 dwarf TOI-1266. Astronomy and Astrophysics, 642:A49. pp. 1-21. ISSN 0004-6361

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Abstract

We report the discovery and characterisation of a super-Earth and a sub-Neptune transiting the bright (K = 8.8), quiet, and nearby (37 pc) M3V dwarf TOI-1266. We validate the planetary nature of TOI-1266 b and c using four sectors of TESS photometry and data from the newly-commissioned 1-m SAINT-EX telescope located in San Pedro Mártir (México). We also include additional ground-based follow-up photometry as well as high-resolution spectroscopy and high-angular imaging observations. The inner, larger planet has a radius of R = 2.37-0.12+0.16 R and an orbital period of 10.9 days. The outer, smaller planet has a radius of R = 1.56-0.13+0.15 R on an 18.8-day orbit. The data are found to be consistent with circular, co-planar and stable orbits that are weakly influenced by the 2:1 mean motion resonance. Our TTV analysis of the combined dataset enables model-independent constraints on the masses and eccentricities of the planets. We find planetary masses of Mp = 13.5-9.0+11.0 M (<36.8 M at 2-σ) for TOI-1266 b and 2.2-1.5+2.0 M (<5.7 M at 2-σ) for TOI-1266 c. We find small but non-zero orbital eccentricities of 0.09-0.05+0.06 (<0.21 at 2-σ) for TOI-1266 b and 0.04 ± 0.03 (< 0.10 at 2-σ) for TOI-1266 c. The equilibrium temperatures of both planets are of 413 ± 20 and 344 ± 16 K, respectively, assuming a null Bond albedo and uniform heat redistribution from the day-side to the night-side hemisphere. The host brightness and negligible activity combined with the planetary system architecture and favourable planet-to-star radii ratios makes TOI-1266 an exquisite system for a detailed characterisation.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 04 Apr 2022 02:53
Last Modified: 30 May 2022 04:08
Uncontrolled Keywords: Instrumentation: detectors; Planets and satellites: detection; Astrophysics - Earth and Planetary Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Identification Number or DOI: https://doi.org/10.1051/0004-6361/202038616
URI: http://eprints.usq.edu.au/id/eprint/47425

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