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A planetary system ...
A planetary system with two transiting mini-Neptunes near the radius valley transition around the bright M dwarf TOI-776
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- Luque, R. (author)
- Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
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- Serrano, L. M. (author)
- Universita degli Studi di Torino,University of Turin
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- Molaverdikhani, K. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Nixon, M. C. (author)
- University Of Cambridge
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- Livingston, J. H. (author)
- University of Tokyo, Japan
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- Guenther, E. W. (author)
- Thüringer Landessternwarte Tautenburg
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- Palle, E. (author)
- Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
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- Madhusudhan, N. (author)
- University Of Cambridge
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- Nowak, G. (author)
- Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
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- Korth, Judith (author)
- Universität zu Köln,University of Cologne
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- Cochran, W. D. (author)
- The University of Texas at Austin, USA
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- Hirano, T. (author)
- Tokyo Institute of Technology
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- Chaturvedi, Priyanka (author)
- Thüringer Landessternwarte Tautenburg
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- Goffo, E. (author)
- Universita degli Studi di Torino,University of Turin
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- Albrecht, S. (author)
- Århus Universitet,Aarhus University
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- Barragán, O. (author)
- University Of Oxford
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Briceño, C. (author)
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- Cabrera, J. (author)
- Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
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- Charbonneau, D. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Cloutier, R. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Collins, K. A. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Collins, Kevin I. (author)
- George Mason University
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- Colón, K. D. (author)
- NASA Goddard Space Flight Center
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- Crossfield, I. J.M. (author)
- University of Kansas
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- Csizmadia, Szilard (author)
- Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
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- Dai, Fei (author)
- California Institute of Technology (Caltech)
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- Deeg, H. J. (author)
- Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
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- Esposito, M. (author)
- Thüringer Landessternwarte Tautenburg
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- Fridlund, Malcolm, 1952 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Universiteit Leiden (UL),Leiden University (UL)
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- Gandolfi, D. (author)
- Universita degli Studi di Torino,University of Turin
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- Georgieva, Iskra, 1987 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Glidden, Ana (author)
- Massachusetts Institute of Technology (MIT)
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- Goeke, Robert (author)
- Massachusetts Institute of Technology (MIT)
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- Grziwa, S. (author)
- Universität zu Köln,University of Cologne
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- Hatzes, A. (author)
- Thüringer Landessternwarte Tautenburg
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- Henze, C. E. (author)
- NASA Ames Research Center
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- Howell, S. B. (author)
- NASA Ames Research Center
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- Irwin, J. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Jenkins, J. M. (author)
- NASA Ames Research Center
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- Jensen, E. L.N. (author)
- Swarthmore College
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- Kabath, Petr (author)
- Czech Academy of Sciences
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- Kidwell, R. C. (author)
- Space Telescope Science Institute (STScI)
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- Kielkopf, J. F. (author)
- University of Louisville
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- Knudstrup, E. (author)
- Århus Universitet,Aarhus University
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- Lam, K. W.F. (author)
- Technische Universität Berlin
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- Latham, D. W. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Lissauer, Jack J. (author)
- NASA Ames Research Center
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- Mann, A. W. (author)
- The University of North Carolina System
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- Matthews, Elisabeth (author)
- Massachusetts Institute of Technology (MIT)
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- Mireles, Ismael (author)
- Massachusetts Institute of Technology (MIT)
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- Narita, N. (author)
- University of Tokyo, Japan,National Institutes of Natural Sciences (NINS),Instituto de Astrofísica de Canarias,Japan Science and Technology Agency (JST)
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- Paegert, M. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Persson, Carina, 1964 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Redfield, S. (author)
- Wesleyan University
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- Ricker, George R. (author)
- Massachusetts Institute of Technology (MIT)
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- Rodler, F. (author)
- European Southern Observatory Santiago
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- Schlieder, Joshua E. (author)
- NASA Goddard Space Flight Center
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- Scott, N. J. (author)
- NASA Ames Research Center
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- Seager, S. (author)
- Massachusetts Institute of Technology (MIT)
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- Šubjak, J. (author)
- Czech Academy of Sciences
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Tan, T. G. (author)
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- Ting, Eric B. (author)
- NASA Ames Research Center
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- Vanderspek, Roland K. (author)
- Massachusetts Institute of Technology (MIT)
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- Van Eylen, Vincent (author)
- University College London (UCL)
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- Winn, J. N. (author)
- Princeton University
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- Ziegler, C. (author)
- University of Toronto
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(creator_code:org_t)
- 2021-01-05
- 2021
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 645
- Related links:
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https://doi.org/10.1...
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Abstract
Subject headings
Close
- We 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 ± 0.03 M⊙) detected during Sector 10 observations of the Transiting Exoplanet Survey Satellite (TESS). Combining the TESS photometry with HARPS radial velocities, as well as ground-based follow-up transit observations from the MEarth and LCOGT telescopes, for the inner planet, TOI-776 b, we measured a period of Pb = 8.25 d, a radius of Rb = 1.85 ± 0.13 R⊙, and a mass of Mb = 4.0 ± 0.9 M⊙; and for the outer planet, TOI-776 c, a period of Pc = 15.66 d, a radius of Rc = 2.02 ± 0.14 R⊙, and a mass of Mc = 5.3 ± 1.8 M⊙. The Doppler data shows one additional signal, with a period of ~34 d, associated with the rotational period of the star. The analysis of fifteen years of ground-based photometric monitoring data and the inspection of different spectral line indicators confirm 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 for M dwarfs, we can start to explore the mechanism(s) responsible for the radius valley emergence around low-mass stars as compared to solar-like stars. While a larger sample of well-characterized planets in this parameter space is still needed to draw firm conclusions, we tentatively estimate that the stellar mass below which thermally-driven mass loss is no longer the main formation pathway for sculpting the radius valley is between 0.63 and 0.54 M⊙. Due to the brightness of the star, the TOI-776 system is also an excellent target for the James Webb Space Telescope, providing a remarkable laboratory in which to break the degeneracy in planetary interior models and to test formation and evolution theories of small planets around low-mass stars.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
Keyword
- Stars: individual: LP 961-53
- Planetary systems
- Stars: low-mass
- Techniques: radial velocities
- Techniques: photometric
Publication and Content Type
- art (subject category)
- ref (subject category)
Find in a library
To the university's database
- By the author/editor
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Luque, R.
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Serrano, L. M.
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Molaverdikhani, ...
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Nixon, M. C.
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Livingston, J. H ...
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Guenther, E. W.
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show more...
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Palle, E.
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Madhusudhan, N.
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Nowak, G.
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Korth, Judith
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Cochran, W. D.
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Hirano, T.
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Chaturvedi, Priy ...
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Goffo, E.
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Albrecht, S.
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Barragán, O.
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Briceño, C.
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Cabrera, J.
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Charbonneau, D.
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Cloutier, R.
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Collins, K. A.
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Collins, Kevin I ...
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Colón, K. D.
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Crossfield, I. J ...
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Csizmadia, Szila ...
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Dai, Fei
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Deeg, H. J.
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Esposito, M.
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Fridlund, Malcol ...
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Gandolfi, D.
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Georgieva, Iskra ...
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Glidden, Ana
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Goeke, Robert
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Grziwa, S.
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Hatzes, A.
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Henze, C. E.
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Howell, S. B.
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Irwin, J.
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Jenkins, J. M.
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Jensen, E. L.N.
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Kabath, Petr
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Kidwell, R. C.
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Kielkopf, J. F.
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Knudstrup, E.
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Lam, K. W.F.
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Latham, D. W.
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Lissauer, Jack J ...
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Mann, A. W.
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Matthews, Elisab ...
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Mireles, Ismael
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Narita, N.
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Paegert, M.
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Persson, Carina, ...
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Redfield, S.
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Ricker, George R ...
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Rodler, F.
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Schlieder, Joshu ...
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Scott, N. J.
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Seager, S.
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Šubjak, J.
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Tan, T. G.
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Ting, Eric B.
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Vanderspek, Rola ...
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Van Eylen, Vince ...
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Winn, J. N.
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Ziegler, C.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Meteorology and ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geophysics
- Articles in the publication
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Astronomy and As ...
- By the university
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Chalmers University of Technology