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A planetary system with two transiting mini-Neptunes near the radius valley transition around the bright M dwarf TOI-776
Luque, R. and Serrano, L.M. and Molaverdikhani, K. and Nixon, M.C. and Livingston, J.H. and Guenther, E.W. and Palle, E. and Madhusudhan, N. and Nowak, G. and Korth, J. and Cochran, W.D. and Hirano, T. and Chaturvedi, P. and Goffo, E. and Albrecht, S. and Barragán, O. and Briceño, C. and Cabrera, J. and Charbonneau, D. and Cloutier, R. and Collins, K.A. and Collins, K.I. and Colón, K.D. and Crossfield, I.J.M. and Csizmadia, Sz. and Dai, F. and Deeg, H.J. and Esposito, M. and Fridlund, M. and Gandolfi, D. and Georgieva, I. and Glidden, A. and Goeke, R.F. and Grziwa, S. and Hatzes, A.P. and Henze, C.E. and Howell, S.B. and Irwin, J. and Jenkins, J.M. and Jensen, E.L.N. and Kabath, P. and Kidwell, Jr. and Kielkopf, J.F. and Knudstrup, E. and Lam, K.W.F. and Latham, D.W. and Lissauer, J.J. and Mann, A.W. and Matthews, E.C. and Mireles, I. and Narita, N. and Paegert, M. and Persson, C.M. and Redfield, S. and Ricker, G.R. and Rodler, F. and Schlieder, J.E. and Scott, N.J. and Seager, S. and Svubjak, J. and Tan, T.G. and Ting, E.B. and Vanderspek, R. and Van Eylen, V. and Winn, J.N. and Ziegler, C.
(2021)
A planetary system with two transiting mini-Neptunes near the radius valley transition around the bright M dwarf TOI-776.
Astronomy & Astrophysics, 645, A41.
EDP Sciences.
doi: 10.1051/0004-6361/202039455.
ISSN 0004-6361.
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Official URL: https://www.aanda.org/articles/aa/abs/2021/01/aa39455-20/aa39455-20.html AbstractWe report the discovery and characterization of two transiting planets around the bright M1 V star LP 961-53 (TOI-776,J=8.5 mag,M=0.54±0.03M) detected during Sector 10 observations of the Transiting Exoplanet Survey Satellite (TESS). Combining them with HARPS radialvelocities, as well as ground-based follow-up transit observations from MEarth and LCOGT telescopes, we measured for the inner planet, TOI-776 b, a period of 8.25 d, a radius of 1.83±0.11R⊕, and a mass of 4.66±0.97M⊕; and for the outer planet, TOI-776 c, a period of 15.66 d, a radiusof 2.06±0.13R⊕, and a mass of 6.1±1.5M⊕. The Doppler data shows one additional signal, with a period of∼35 d, associated with the rotationalperiod of the star. The analysis of fifteen years of ground-based photometric monitoring data and the inspection of different spectral line indicatorsconfirm this assumption. The bulk densities of TOI-776 b and c allow for a wide range of possible interior and atmospheric compositions. However,both planets have retained a significant atmosphere, with slightly different envelope mass fractions. Thanks to their location near the radius gap forM dwarfs, we can start to explore the mechanism(s) responsible for the radius valley emergence around low-mass stars as compared to solar-likestars. While a larger sample of well-characterized planets in this parameter space is still needed to draw firm conclusions, we tentatively estimatethat the stellar mass below which thermally-driven mass loss is no longer the main formation pathway for sculpting the radius valley is between0.63 and 0.54M. Due to the brightness of the star, the TOI-776 system is also an excellent target for theJWST, providing a remarkable laboratoryto break the degeneracy in planetary interior models and to test formation and evolution theories of small planets around low-mass stars | Item URL in elib: | https://elib.dlr.de/137290/ |
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| Document Type: | Article |
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| Title: | A planetary system with two transiting mini-Neptunes near the radius valley transition around the bright M dwarf TOI-776 |
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| Authors: | | Authors | Institution or Email of Authors | Author's ORCID iD |
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| Luque, R. | Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain );; Departamento de Astrofisica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, Spain | UNSPECIFIED | | Serrano, L.M. | Dipartimento di Fisica, Università degli Studi di Torino, via PietroGiuria 1, I-10125, Torino, Italy | UNSPECIFIED | | Molaverdikhani, K. | Landessternwarte, Zentrum für Astronomie der Universität Heidelberg, Königstuhl 12, 69117 Heidelberg, Germany; Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany | UNSPECIFIED | | Nixon, M.C. | Institute of Astronomy, University of Cambridge, Madingley Road,Cambridge CB3 0HA, UK | UNSPECIFIED | | Livingston, J.H. | Department of Astronomy, University of Tokyo, 7-3-1 Hongo,Bunkyo-ky, Tokyo 113-0033, Japan | UNSPECIFIED | | Guenther, E.W. | Thüringer Landessternwarte Tautenburg, 07778, Tautenburg, Germany | UNSPECIFIED | | Palle, E. | instituto de astrofísica de canarias, 38205 la laguna, tenerife, spain | departamento de astrofisica, universidad de la laguna, 38206 la laguna, spain | UNSPECIFIED | | Madhusudhan, N. | IoA, University of Cambridge, UK | UNSPECIFIED | | Nowak, G. | Instituto de Astrofısica de Canarias (IAC), 38205 La Laguna, Tenerife, Spain | UNSPECIFIED | | Korth, J. | Rheinisches Institut für Umweltforschung an der Universitaet zu Koeln, Aachener Strasse 209, D-50931 Koeln, Germany | UNSPECIFIED | | Cochran, W.D. | Center for Planetary Systems Habitability and McDonald Observa-tory, The University of Texas at Austin, Austin, TX 78730, USA | UNSPECIFIED | | Hirano, T. | Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan | UNSPECIFIED | | Chaturvedi, P. | Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Taut-enburg, Germany | UNSPECIFIED | | Goffo, E. | Dipartimento di Fisica, Università degli Studi di Torino, via PietroGiuria 1, I-10125, Torino, Italy | UNSPECIFIED | | Albrecht, S. | Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark | UNSPECIFIED | | Barragán, O. | Sub-department of Astrophysics, Department of Physics, Universityof Oxford, Oxford OX1 3RH, UK | UNSPECIFIED | | Briceño, C. | Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile | UNSPECIFIED | | Cabrera, J. | nstitute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany | UNSPECIFIED | | Charbonneau, D. | Center for Astrophysics|Harvard & Smithsonian, 60 Garden Street,Cambridge, MA 02138, USA | UNSPECIFIED | | Cloutier, R. | Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA | UNSPECIFIED | | Collins, K.A. | Center for Astrophysics|Harvard & Smithsonian, 60 Garden Street,Cambridge, MA 02138, USA | UNSPECIFIED | | Collins, K.I. | George Mason University, 4400 University Drive, Fairfax, VA,22030 USA | UNSPECIFIED | | Colón, K.D. | Exoplanets and Stellar Astrophysics Laboratory, Mail Code 667,NASA Goddard Space Flight Center, 8800 Greenbelt Rd., Green-belt MD, 20771, USA | UNSPECIFIED | | Crossfield, I.J.M. | Department of Physics and Astronomy, University of Kansas,Lawrence, KS, USA | UNSPECIFIED | | Csizmadia, Sz. | nstitute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany | https://orcid.org/0000-0001-6803-9698 | | Dai, F. | Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ, 08544, USA; Department of Physics and Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, MA, 02139, USA | UNSPECIFIED | | Deeg, H.J. | instituto de astrofísica de canarias, 38205 la laguna, tenerife, spain | departamento de astrofisica, universidad de la laguna, 38206 la laguna, spain | UNSPECIFIED | | Esposito, M. | Thüringer Landessternwarte Tautenburg, 07778, Tautenburg, Germany | UNSPECIFIED | | Fridlund, M. | Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, 439 92, Onsala, Sweden; Leiden Observatory, Leiden University, 2333CA, Leiden, The Netherlands | UNSPECIFIED | | Gandolfi, D. | Dipartimento di Fisica, Università di Torino, via P. Giuria 1, I-10125 Torino, Italy | UNSPECIFIED | | Georgieva, I. | Department of Space, Earth and Environment, Onsala Space Observatory, Chalmers University of Technology, SE-439 92, Onsala, Sweden | UNSPECIFIED | | Glidden, A. | Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de la Astronomía s/n, 18008 Granada, Spain | UNSPECIFIED | | Goeke, R.F. | Department of Earth, Atmospheric and Planetary Sciences, Mas-sachusetts Institute of Technology, Cambridge, MA 02139, USA | UNSPECIFIED | | Grziwa, S. | Rheinisches Institut furr Umweltforschung an der Universitaet zu Koeln, Aachener Strasse 209, 50931 Koeln, Germany | UNSPECIFIED | | Hatzes, A.P. | Thüringer Landessternwarte Tautenburg, 07778, Tautenburg, Germany | UNSPECIFIED | | Henze, C.E. | Space Science & Astrobiology Division, NASA Ames ResearchCenter, Moffett Field, CA 94035, USA | UNSPECIFIED | | Howell, S.B. | Space Science & Astrobiology Division, NASA Ames ResearchCenter, Moffett Field, CA 94035, USA | UNSPECIFIED | | Irwin, J. | Center for Astrophysics|Harvard & Smithsonian, 60 Garden Street,Cambridge, MA 02138, USA | UNSPECIFIED | | Jenkins, J.M. | Space Science & Astrobiology Division, NASA Ames ResearchCenter, Moffett Field, CA 94035, USA | UNSPECIFIED | | Jensen, E.L.N. | Dept. of Physics & Astronomy, Swarthmore College, SwarthmorePA 19081, USA | UNSPECIFIED | | Kabath, P. | Astronomical Institute, Czech Academy of Sciences, Fricova 298, 25165, Ondrejov, Czech Republic | UNSPECIFIED | | Kidwell, Jr. | pace Telescope Science Institute, Baltimore, MD, USA | UNSPECIFIED | | Kielkopf, J.F. | Department of Physics and Astronomy, University of Louisville,Louisville, KY 40292, USA | UNSPECIFIED | | Knudstrup, E. | Stellar Astrophysics Centre, Deparment of Physics and Astronomy, Aarhus University, Ny Munkegrade 120, 8000 Aarhus C, Denmark | UNSPECIFIED | | Lam, K.W.F. | Center for Astronomy and Astrophysics, Technical University Berlin, Hardenbergstr. 36, 10623 Berlin, Germany | UNSPECIFIED | | Latham, D.W. | Center for Astrophysics|Harvard & Smithsonian, 60 Garden Street,Cambridge, MA 02138, USA | UNSPECIFIED | | Lissauer, J.J. | Space Science & Astrobiology Division, NASA Ames ResearchCenter, Moffett Field, CA 94035, USA | UNSPECIFIED | | Mann, A.W. | Department of Physics and Astronomy, The University of NorthCarolina at Chapel Hill, Chapel Hill, NC 27599-3255, USA | UNSPECIFIED | | Matthews, E.C. | Department of Physics and Kavli Institute for Astrophysics andSpace Research, Massachusetts Institute of Technology, Cambridge,MA 02139, USA | UNSPECIFIED | | Mireles, I. | Department of Physics and Kavli Institute for Astrophysics andSpace Research, Massachusetts Institute of Technology, Cambridge,MA 02139, USA | UNSPECIFIED | | Narita, N. | Department of Astronomy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan | UNSPECIFIED | | Paegert, M. | Center for Astrophysics|Harvard & Smithsonian, 60 Garden Street,Cambridge, MA 02138, USA | UNSPECIFIED | | Persson, C.M. | Department of Space, Earth and Environment, Chalmers Universityof Technology, Onsala Space Observatory, 439 92 Onsala, Sweden | UNSPECIFIED | | Redfield, S. | Astronomy Department and Van Vleck Observatory, Wesleyan University, Middletown, CT, 06459, USA | UNSPECIFIED | | Ricker, G.R. | Department of Physics and Kavli Institute for Astrophysics andSpace Research, Massachusetts Institute of Technology, Cambridge,MA 02139, USA | UNSPECIFIED | | Rodler, F. | Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA | UNSPECIFIED | | Schlieder, J.E. | Exoplanets and Stellar Astrophysics Laboratory, Mail Code 667,NASA Goddard Space Flight Center, 8800 Greenbelt Rd., Green-belt MD, 20771, USA | UNSPECIFIED | | Scott, N.J. | Space Science & Astrobiology Division, NASA Ames ResearchCenter, Moffett Field, CA 94035, USA | UNSPECIFIED | | Seager, S. | NSF Graduate Research Fellow, Steward Observatory, University of Arizona, Tucson, AZ, 85721, USA; Department of Earth, Atmospheric and Planetary Sciences, MIT, Cambridge, MA, 02139, USA; Department of Aeronautics and Astronautics, MIT, Cambridge, MA, 0213 | UNSPECIFIED | | Svubjak, J. | Astronomical Institute of the Czech Academy of Sciences, Friˇcova298, 25165 Ondˇrejov, Czech Republic | UNSPECIFIED | | Tan, T.G. | erth Exoplanet Survey Telescope, Perth, Western Australia | UNSPECIFIED | | Ting, E.B. | Space Science & Astrobiology Division, NASA Ames ResearchCenter, Moffett Field, CA 94035, USA | UNSPECIFIED | | Vanderspek, R. | Department of Physics and Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, MA, 02139, USA | UNSPECIFIED | | Van Eylen, V. | Mullard Space Science Laboratory, University College London,Holmbury St Mary, Dorking, Surrey RH5 6NT, UK | UNSPECIFIED | | Winn, J.N. | Massachusetts Institute of Technology (MIT) 77 Massachusetts Avenue, Cambridge, MA 02139-4307, United States | UNSPECIFIED | | Ziegler, C. | Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, Ontario, M5S 3H4, Canada | UNSPECIFIED |
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| Date: | 2021 |
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| Journal or Publication Title: | Astronomy & Astrophysics |
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| Refereed publication: | Yes |
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| Open Access: | Yes |
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| Gold Open Access: | No |
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| In SCOPUS: | Yes |
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| In ISI Web of Science: | Yes |
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| Volume: | 645 |
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DOI
: | 10.1051/0004-6361/202039455 |
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| Page Range: | A41 |
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| Publisher: | EDP Sciences |
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| ISSN: | 0004-6361 |
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| Status: | Published |
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| Keywords: | lanetary systems – techniques: photometric – techniques: radial velocities – stars: individual: LP 961-53 – stars: low-mass |
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| HGF - Research field: | Aeronautics, Space and Transport |
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| HGF - Program: | Space |
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| HGF - Program Themes: | Space Exploration |
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| DLR - Research area: | Raumfahrt |
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| DLR - Program: | R EW - Space Exploration |
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| DLR - Research theme (Project): | R - Project PLATO (old) |
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Location: |
Berlin-Adlershof
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| Institutes and Institutions: | Institute of Planetary Research > Extrasolar Planets and Atmospheres |
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| Deposited By: |
Csizmadia, Szilard
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| Deposited On: | 05 Jan 2021 07:25 |
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| Last Modified: | 05 Jan 2021 07:25 |
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