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

Demory, B.-O. and Pozuelos, F. J. and Gómez Maqueo Chew, Y. 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 Jofré, E. and Kane, S. R. and Lillo-Box, J. and Maigné, 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-Velásquez, 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 Díaz, G. and Suárez, 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. and Huber, D. and Isaacson, H. and Lissauer, J. J. and Morales-Calderón, 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 . Art. No. A49. ISSN 0004-6361.

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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 M_p = 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Demory, B.-O.0000-0002-9355-5165
Pozuelos, F. J.0000-0003-1572-7707
Gillon, M.0000-0003-1462-7739
Bieryla, A.0000-0001-6637-5401
de Wit, J.0000-0003-2415-2191
Dressing, C. D.0000-0001-8189-0233
Jehin, E.0000-0001-8923-488X
Kane, S. R.0000-0002-7084-0529
Mordasini, C.0000-0002-1013-2811
Queloz, D.0000-0002-3012-0316
Stassun, K. G.0000-0002-3481-9052
Triaud, A. H. M. J.0000-0002-5510-8751
Latham, D. W.0000-0001-9911-7388
Seager, S.0000-0002-6892-6948
Winn, J. N.0000-0002-4265-047X
Jenkins, J. M.0000-0002-4715-9460
Herrera, J.0000-0002-3771-4918
Batalha, N. M.0000-0002-7030-9519
Dai, F.0000-0002-8958-0683
Huang, C. X.0000-0003-0918-7484
Huber, D.0000-0001-8832-4488
Isaacson, H.0000-0002-0531-1073
Lissauer, J. J.0000-0001-6513-1659
Robertson, P.0000-0003-0149-9678
Roy, A.0000-0001-8127-5775
Vanderburg, A.0000-0001-7246-5438
Weiss, L. M.0000-0002-3725-3058
Additional Information:© ESO 2020. Received 9 June 2020 / Accepted 20 July 2020. We warmly thank the entire technical staff of the Observatorio Astronómico Nacional at San Pedro Mártir in México for their unfailing support to SAINT-EX operations, namely: U. Ceseña, A. Córdova, B. García, C.A. Guerrero, F. Guillén, J.A. Hernández, B. Hernández, E. López, B. Martínez, G. Melgoza, F. Montalvo, S. Monrroy,J.C. Narvaez, J.M. Nuñez, J.L. Ochoa, I. Plauchú, F. Quiroz, H. Serrano, T. Verdugo. We gratefully acknowledgethe support from the Embassy of México in Bern to the SAINT-EX project. We also thank the past members of the SAINT-EX team B. Courcol, E. Rose and K. Housen for their help in the course of the project. We are grateful to the anonymous referee for a thorough and helpful review of our paper. We thank Jonathan Irwin for his help on the TRES data analysis. B.-O.D. acknowledges support from the Swiss National Science Foundation (PP00P2-163967). This work has been carried out within the frame of the National Centre for Competence in Research PlanetS supported by the Swiss National Science Foundation. Y.G.M.C acknowledges support from UNAM-PAPIIT IN-107518. R.P. and E.J. acknowledge DGAPA for their postdoctoral fellowships. The research leading to these results has received funding from the ARC grant for Concerted Research Actions, financed by the Wallonia-Brussels Federation. TRAPPIST is funded by the Belgian Fund for Scientific Research (Fonds National de la Recherche Scientifique, FNRS) under the grant FRFC 2.5.594.09.F, with the participation of the Swiss National Science Fundation (SNF). TRAPPIST-North is a project funded by the University of Liege, and performed in collaboration with Cadi Ayyad University of Marrakesh. M.G. and E.J. are F.R.S.-FNRS Senior Research Associates. J.C.S. acknowledges funding support from Spanish public funds for research under projects ESP2017-87676-2-2 and RYC-2012-09913 (Ramón y Cajal programme) of the Spanish Ministry of Science and Education. This paper includes data collected by the TESS mission. We acknowledge the use of public TOI Release data from pipelines at the TESS Science Office and at the TESS Science Processing Operations Center. Funding for the TESS mission is provided by the NASA Explorer Program. Resources supporting this work were provided by the NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center for the production of the SPOC data products. This work is based upon observationscarried out at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir (OAN-SPM), Baja California, México. This research has been partly funded by the Spanish State Research Agency (AEI) Projects No.ESP2017-87676-C5-1-R and No. MDM-2017-0737 Unidad de Excelencia “María de Maeztu”- Centro de Astrobiología (INTA-CSIC). This paper is based on observations collected at Centro Astronómico Hispano en Andalucía (CAHA) at Calar Alto, operated jointly by Instituto de Astrofísica de Andalucía (CSIC) and Junta de Andalucía. The research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013) ERC Grant Agreement no 336480 (SPECULOOS). D.H. acknowledges support from the Alfred P. Sloan Foundation, the National Aeronautics and Space Administration (80NSSC18K1585, 80NSSC19K0379), and the National Science Foundation (AST-1717000). We finally acknowledge support from the Antoine de Saint-Exupéry Youth Foundation through their involvement in the educational programme of the SAINT-EX Observatory.
Funding AgencyGrant Number
Swiss National Science Foundation (SNSF)PP00P2-163967
Programa de Apoyo a Proyectos de Investigación e Innovación Tecnológica (PAPIIT)IN-107518
Dirección General de Asuntos del Personal Académico (DGAPA)UNSPECIFIED
Wallonia-Brussels FederationUNSPECIFIED
Fonds de la Recherche Scientifique (FNRS)FRFC 2.5.594.09.F
University of LiegeUNSPECIFIED
Ministerio de Ciencia e Innovación (MCINN)ESP2017-87676-2-2
Ramón y Cajal ProgrammeRYC-2012-09913
Ministerio de Ciencia e Innovación (MCINN)ESP2017-87676-C5-1-R
Ministerio de Ciencia e Innovación (MCINN)MDM-2017-0737
European Research Council (ERC)336480
Alfred P. Sloan FoundationUNSPECIFIED
Antoine de Saint-Exupéry Youth FoundationUNSPECIFIED
Subject Keywords:instrumentation: detectors / planets and satellites: detection
Record Number:CaltechAUTHORS:20201002-155843195
Persistent URL:
Official Citation:A super-Earth and a sub-Neptune orbiting the bright, quiet M3 dwarf TOI-1266 B.-O. Demory, F. J. Pozuelos, Y. Gómez Maqueo Chew, L. Sabin, R. Petrucci, U. Schroffenegger, S. L. Grimm, M. Sestovic, M. Gillon, J. McCormac, K. Barkaoui, W. Benz, A. Bieryla, F. Bouchy, A. Burdanov, K. A. Collins, J. de Wit, C. D. Dressing, L. J. Garcia, S. Giacalone, P. Guerra, J. Haldemann, K. Heng, E. Jehin, E. Jofré, S. R. Kane, J. Lillo-Box, V. Maigné, C. Mordasini, B. M. Morris, P. Niraula, D. Queloz, B. V. Rackham, A. B. Savel, A. Soubkiou, G. Srdoc, K. G. Stassun, A. H. M. J. Triaud, R. Zambelli, G. Ricker, D. W. Latham, S. Seager, J. N. Winn, J. M. Jenkins, T. Calvario-Velásquez, J. A. Franco Herrera, E. Colorado, E. O. Cadena Zepeda, L. Figueroa, A. M. Watson, E. E. Lugo-Ibarra, L. Carigi, G. Guisa, J. Herrera, G. Sierra Díaz, J. C. Suárez, D. Barrado, N. M. Batalha, Z. Benkhaldoun, A. Chontos, F. Dai, Z. Essack, M. Ghachoui, C. X. Huang, D. Huber, H. Isaacson, J. J. Lissauer, M. Morales-Calderón, P. Robertson, A. Roy, J. D. Twicken, A. Vanderburg and L. M. Weiss A&A, 642 (2020) A49 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105776
Deposited By: George Porter
Deposited On:05 Oct 2020 14:10
Last Modified:05 Oct 2020 14:10

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