A planetary system with two transiting mini-Neptunes near the radius valley transition around the bright M dwarf TOI-776

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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. (author): Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna

Serrano, L. M. (author): Universita degli Studi di Torino,University of Turin

Molaverdikhani, K. (author): Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)

Nixon, M. C. (author): University Of Cambridge

Livingston, J. H. (author): University of Tokyo, Japan

Guenther, E. W. (author): Thüringer Landessternwarte Tautenburg

Palle, E. (author): Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna

Madhusudhan, N. (author): University Of Cambridge

Nowak, G. (author): Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias

Korth, Judith (author): Universität zu Köln,University of Cologne

Cochran, W. D. (author): The University of Texas at Austin, USA

Hirano, T. (author): Tokyo Institute of Technology

Chaturvedi, Priyanka (author): Thüringer Landessternwarte Tautenburg

Goffo, E. (author): Universita degli Studi di Torino,University of Turin

Albrecht, S. (author): Århus Universitet,Aarhus University

Barragán, O. (author): University Of Oxford

Briceño, C. (author)

Cabrera, J. (author): Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)

Charbonneau, D. (author): Harvard-Smithsonian Center for Astrophysics

Cloutier, R. (author): Harvard-Smithsonian Center for Astrophysics

Collins, K. A. (author): Harvard-Smithsonian Center for Astrophysics

Collins, Kevin I. (author): George Mason University

Colón, K. D. (author): NASA Goddard Space Flight Center

Crossfield, I. J.M. (author): University of Kansas

Csizmadia, Szilard (author): Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)

Dai, Fei (author): California Institute of Technology (Caltech)

Deeg, H. J. (author): Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna

Esposito, M. (author): Thüringer Landessternwarte Tautenburg

Fridlund, Malcolm, 1952 (author): Chalmers tekniska högskola,Chalmers University of Technology,Universiteit Leiden (UL),Leiden University (UL)

Gandolfi, D. (author): Universita degli Studi di Torino,University of Turin

Georgieva, Iskra, 1987 (author): Chalmers tekniska högskola,Chalmers University of Technology

Glidden, Ana (author): Massachusetts Institute of Technology (MIT)

Goeke, Robert (author): Massachusetts Institute of Technology (MIT)

Grziwa, S. (author): Universität zu Köln,University of Cologne

Hatzes, A. (author): Thüringer Landessternwarte Tautenburg

Henze, C. E. (author): NASA Ames Research Center

Howell, S. B. (author): NASA Ames Research Center

Irwin, J. (author): Harvard-Smithsonian Center for Astrophysics

Jenkins, J. M. (author): NASA Ames Research Center

Jensen, E. L.N. (author): Swarthmore College

Kabath, Petr (author): Czech Academy of Sciences

Kidwell, R. C. (author): Space Telescope Science Institute (STScI)

Kielkopf, J. F. (author): University of Louisville

Knudstrup, E. (author): Århus Universitet,Aarhus University

Lam, K. W.F. (author): Technische Universität Berlin

Latham, D. W. (author): Harvard-Smithsonian Center for Astrophysics

Lissauer, Jack J. (author): NASA Ames Research Center

Mann, A. W. (author): The University of North Carolina System

Matthews, Elisabeth (author): Massachusetts Institute of Technology (MIT)

Mireles, Ismael (author): Massachusetts Institute of Technology (MIT)

Narita, N. (author): University of Tokyo, Japan,National Institutes of Natural Sciences (NINS),Instituto de Astrofísica de Canarias,Japan Science and Technology Agency (JST)

Paegert, M. (author): Harvard-Smithsonian Center for Astrophysics

Persson, Carina, 1964 (author): Chalmers tekniska högskola,Chalmers University of Technology

Redfield, S. (author): Wesleyan University

Ricker, George R. (author): Massachusetts Institute of Technology (MIT)

Rodler, F. (author): European Southern Observatory Santiago

Schlieder, Joshua E. (author): NASA Goddard Space Flight Center

Scott, N. J. (author): NASA Ames Research Center

Seager, S. (author): Massachusetts Institute of Technology (MIT)

Šubjak, J. (author): Czech Academy of Sciences

Tan, T. G. (author)

Ting, Eric B. (author): NASA Ames Research Center

Vanderspek, Roland K. (author): Massachusetts Institute of Technology (MIT)

Van Eylen, Vincent (author): University College London (UCL)

Winn, J. N. (author): Princeton University

Ziegler, C. (author): University of Toronto

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(creator_code:org_t)

2021-01-05
2021
English.
In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 645

Related links:: https://authors.libr...; show more...; https://doi.org/10.1...; https://research.cha...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

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

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By the author/editor: Luque, R.; Serrano, L. M.; Molaverdikhani, ...; Nixon, M. C.; Livingston, J. H ...; Guenther, E. W.; show more...; Palle, E.; Madhusudhan, N.; Nowak, G.; Korth, Judith; Cochran, W. D.; Hirano, T.; Chaturvedi, Priy ...; Goffo, E.; Albrecht, S.; Barragán, O.; Briceño, C.; Cabrera, J.; Charbonneau, D.; Cloutier, R.; Collins, K. A.; Collins, Kevin I ...; Colón, K. D.; Crossfield, I. J ...; Csizmadia, Szila ...; Dai, Fei; Deeg, H. J.; Esposito, M.; Fridlund, Malcol ...; Gandolfi, D.; Georgieva, Iskra ...; Glidden, Ana; Goeke, Robert; Grziwa, S.; Hatzes, A.; Henze, C. E.; Howell, S. B.; Irwin, J.; Jenkins, J. M.; Jensen, E. L.N.; Kabath, Petr; Kidwell, R. C.; Kielkopf, J. F.; Knudstrup, E.; Lam, K. W.F.; Latham, D. W.; Lissauer, Jack J ...; Mann, A. W.; Matthews, Elisab ...; Mireles, Ismael; Narita, N.; Paegert, M.; Persson, Carina, ...; Redfield, S.; Ricker, George R ...; Rodler, F.; Schlieder, Joshu ...; Scott, N. J.; Seager, S.; Šubjak, J.; Tan, T. G.; Ting, Eric B.; Vanderspek, Rola ...; Van Eylen, Vince ...; Winn, J. N.; Ziegler, C.; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Meteorology and ...

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Geophysics

Articles in the publication: Astronomy and As ...

By the university: Chalmers University of Technology

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