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The HD 260655 system: Two rocky worlds transiting a bright M dwarf at 10 pc

Luque, R. and Fulton, B. J. and Kunimoto, M. and Amado, P. J. and Gorrini, P. and Dreizler, S. and Hellier, C. and Henry, G. W. and Molaverdikhani, K. and Morello, G. and Peña-Moñino, L. and Pérez-Torres, M. A. and Pozuelos, F. J. and Shan, Y. and Anglada-Escudé, G. and Béjar, V. J. S. and Bergond, G. and Boyle, A. W. and Caballero, J. A. and Charbonneau, D. and Ciardi, D. R. and Dufoer, S. and Espinoza, N. and Everett, M. and Fischer, D. A. and Hatzes, A. P. and Henning, Th. and Hesse, K. and Howard, A. W. and Howell, S. B. and Isaacson, H. and Jeffers, S. V. and Jenkins, J. M. and Kane, S. R. and Kemmer, J. and Khalafinejad, S. and Kidwell, R. C. and Kossakowski, D. and Latham, D. W. and Lillo-Box, J. and Lissauer, J. J. and Montes, D. and Orell-Miquel, J. and Pallé, E. and Pollacco, D. and Quirrenbach, A. and Reffert, S. and Reiners, A. and Ribas, I. and Ricker, G. R. and Rogers, L. A. and Sanz-Forcada, J. and Schlecker, M. and Schweitzer, A. and Seager, S. and Shporer, A. and Stassun, K. G. and Stock, S. and Tal-Or, L. and Ting, E. B. and Trifonov, T. and Vanaverbeke, S. and Vanderspek, R. and Villaseñor, J. and Winn, J. N. and Winters, J. G. and Zapatero Osorio, M. R. (2022) The HD 260655 system: Two rocky worlds transiting a bright M dwarf at 10 pc. Astronomy and Astrophysics, 664 . Art. No. A199. ISSN 0004-6361. doi:10.1051/0004-6361/202243834.

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We report the discovery of a multiplanetary system transiting the M0 V dwarf HD 260655 (GJ 239, TOI-4599). The system consists of at least two transiting planets, namely HD 260655 b, with a period of 2.77 d, a radius of Rb = 1.240 ± 0.023 R⊕, a mass of Mb = 2.14 ± 0.34 M⊕, and a bulk density of ρb = 6.2 ± 1.0 g cm−3, and HD 260655 c, with a period of 5.71 d, a radius of ${R_c} = 1.533_{ - 0.046}^{ + 0.051}{R_ \oplus }$, a mass of Mc = 3.09 ± 0.48 M⊕, and a bulk density of ${\rho _c} = 4.7_{ - 0.8}^{ + 0.9}{\rm{g}}$ g cm−3. The planets have been detected in transit by the Transiting Exoplanet Survey Satellite (TESS) mission and confirmed independently with archival and new precise radial velocities obtained with the HIRES and CARMENES instruments since 1998 and 2016, respectively. At a distance of 10 pc, HD 260655 has become the fourth closest known multitransiting planet system after HD 219134, LTT 1445 A, and AU Mic. Due to the apparent brightness of the host star (J = 6.7 mag), both planets are among the most suitable rocky worlds known today for atmospheric studies with the James Webb Space Telescope, both in transmission and emission.

Item Type:Article
Related URLs:
URLURL TypeDescription
Luque, R.0000-0002-4671-2957
Fulton, B. J.0000-0003-3504-5316
Dreizler, S.0000-0001-6187-5941
Hellier, C.0000-0002-3439-1439
Henry, G. W.0000-0003-4155-8513
Morello, G.0000-0002-4262-5661
Pérez-Torres, M. A.0000-0001-5654-0266
Pozuelos, F. J.0000-0003-1572-7707
Anglada-Escudé, G.0000-0002-3645-5977
Béjar, V. J. S.0000-0002-5086-4232
Charbonneau, D.0000-0002-9003-484X
Ciardi, D. R.0000-0002-5741-3047
Espinoza, N.0000-0001-9513-1449
Everett, M.0000-0002-0885-7215
Fischer, D. A.0000-0003-2221-0861
Henning, Th.0000-0002-1493-300X
Howard, A. W.0000-0001-8638-0320
Howell, S. B.0000-0002-2532-2853
Isaacson, H.0000-0002-0531-1073
Jenkins, J. M.0000-0002-4715-9460
Kane, S. R.0000-0002-7084-0529
Kemmer, J.0000-0003-3929-1442
Kossakowski, D.0000-0002-0436-7833
Latham, D. W.0000-0001-9911-7388
Lillo-Box, J.0000-0003-3742-1987
Lissauer, J. J.0000-0001-6513-1659
Orell-Miquel, J.0000-0003-2066-8959
Pallé, E.0000-0003-0987-1593
Quirrenbach, A.0000-0002-8388-6040
Rogers, L. A.0000-0003-0638-3455
Seager, S.0000-0002-6892-6948
Shporer, A.0000-0002-1836-3120
Stassun, K. G.0000-0002-3481-9052
Stock, S.0000-0002-1166-9338
Vanderspek, R.0000-0001-6763-6562
Winn, J. N.0000-0002-4265-047X
Additional Information:This paper includes data collected by the TESS mission. Funding for the TESS mission is provided by the NASA Explorer Program. We acknowledge the use of public TESS data from pipelines at the TESS Science Office and at the TESS Science Processing Operations Center. 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 research has made use of the Exoplanet Follow-up Observation Program website, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. CARMENES is an instrument at the Centro Astronómico Hispano-Alemán (CAHA) at Calar Alto (Almería, Spain), operated jointly by the Junta de Andalucía and the Instituto de Astrofísica de Andalucía (CSlC). CARMENES was funded by the Max-Planck-Gesellschaft (MPG), the Consejo Superior de Investigaciones Científicas (CSIC), the Ministerio de Economía y Competitividad (MINECO) and the European Regional Development Fund (ERDF) through projects FICTS-2011-02, ICTS-2017-07-CAHA-4, and CAHA16-CE-3978, and the members of the CARMENES Consortium with additional contributions. Some of the observations in this paper made use of the NN-EXPLORE Exoplanet and Stellar Speckle Imager (NESSI). NESSI was funded by the NASA Exoplanet Exploration Program and the NASA Ames Research Center. NESSI was built at the Ames Research Center by Steve B. Howell, Nic Scott, Elliott P. Horch, and Emmett Quigley. R.L. acknowledges funding from University of La Laguna through the Margarita Salas Fellowship from the Spanish Ministry of Universities ref. UNI/551/2021-May 26, and under the EU Next Generation funds. We acknowledge financial support from the Agencia Estatal de Investigación of the Ministerio de Ciencia e Innovación and the ERDF “A way of making Europe” through projects PID2019-109522GB-C5[1:4]/AEI/10.13039/501100011033 and the Centre of Excellence “Severo Ochoa” and “María de Maeztu” awards to the Instituto de Astrofísica de Canarias (CEX2019-000920-S), Instituto de Astrofísica de Andalucía (SEV-2017-0709), and Centro de Astrobiología (MDM-2017-0737); the Generalitat de Catalunya/CERCA programme; the Deutsche Forschungsgemeinschaft (DFG) through the Major Research Instrumentation Programme and Research Unit FOR2544 “Blue Planets around Red Stars” (RE 2694/8-1, KU 3625/2-1), the Excellence Cluster ORIGINS (EXC-2094 – 390783311) and the Priority Programme “Exploring the Diversity of Extrasolar Planets” (JE 701/5-1); the National Aeronautics and Space Administration under grants 80NSSC21K0367 and 80NSSC22K0165 in support of Cycles 3 and 4 of the TESS Guest Investigator program; the National Science Foundation, Tennessee State University, and the State of Tennessee through its Centers of Excellence Program; and the Bulgarian BNSF program “VIHREN-2021” project No. KP-06-DV/5. The results reported herein benefited from collaborations and/or information exchange within the program “Alien Earths” (supported by the National Aeronautics and Space Administration under agreement No. 80NSSC21K0593) for NASA’s Nexus for Exoplanet System Science (NExSS) research coordination network sponsored by NASA’s Science Mission Directorate. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. We thank VeraM. Passegger for a helpful discussion on the photospheric parameters of HD 260655.
Group:Infrared Processing and Analysis Center (IPAC), Astronomy Department
Funding AgencyGrant Number
European Regional Development FundFICTS-2011-02
European Regional Development FundICTS-2017-07-CAHA-4
European Regional Development FundCAHA16-CE-3978
Ministerio de Ciencia e Innovación (MCINN)UNI/551/2021-May 26
Ministerio de Ciencia e Innovación (MCINN)PID2019-109522GB-C5[1:4]/AEI/10.13039/501100011033
Ministerio de Ciencia e Innovación (MCINN)CEX2019-000920-S
Ministerio de Ciencia e Innovación (MCINN)SEV-2017-0709
Ministerio de Ciencia e Innovación (MCINN)MDM-2017-0737
Generalitat de CatalunyaUNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)FOR2544
Deutsche Forschungsgemeinschaft (DFG)RE 2694/8-1
Deutsche Forschungsgemeinschaft (DFG)KU 3625/2-1
Deutsche Forschungsgemeinschaft (DFG)EXC-2094 – 390783311
Deutsche Forschungsgemeinschaft (DFG)JE 701/5-1
State of Tennessee Centers of Excellence programUNSPECIFIED
National Science Fund (Bulgaria)KP-06-DV/5
Record Number:CaltechAUTHORS:20220916-665853000
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117026
Deposited By: Olivia Warschaw
Deposited On:29 Oct 2022 22:04
Last Modified:01 Nov 2022 17:47

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