ASTEP confirmation of a pair of long-period Jupiter-sized planets with extremely low densities transiting TOI-791

Georgina Dransfield; Antoine C. Petit; Amaury H.M.J. Triaud; Tristan Guillot; François Xavier Schmider; Lyu Abe; Abdelkrim Agabi; Khalid Barkaoui; Thomas A. Baycroft; Philippe Bendjoya; Rafael Brahm; Karen A. Collins; Billy Edwards; Phil Evans; Alix V. Freckelton; Nolan Grieves; Steve B. Howell; Franco Mallia; Djamel Mekarnia; Angelica Psaridi; Daniel Sebastian; Keivan G. Stassun; Chris Stockdale; Amalie Stokholm; Olga Suarez; Thiam Guan Tan; Mathilde Timmermans; Cristilyn N. Watkins; Carl Ziegler; Abderahmane Soubkiou; François Bouchy; Marion Cointepas; Vincent Deloupy; Maximilian N. Günther; Michaël Gillon; Giovanni Isopi; Emmanuel Jehin; Jon M. Jenkins; Andrés Jordán; Martin B. Nielsen; Sara Seager; Avi Shporer; Julia V. Seidel; Michal Steiner; Trifon Trifonov; Joseph D. Twicken; Joshua N. Winn; Aldo Zapparata

doi:10.1093/mnras/stag864

ASTEP confirmation of a pair of long-period Jupiter-sized planets with extremely low densities transiting TOI-791

Georgina Dransfield
, Antoine C. Petit
, Amaury H.M.J. Triaud
, Tristan Guillot
, François Xavier Schmider
, Lyu Abe
, Abdelkrim Agabi
, Khalid Barkaoui
, Thomas A. Baycroft
, Philippe Bendjoya
, Rafael Brahm
, Karen A. Collins
, Billy Edwards
, Phil Evans
, Alix V. Freckelton
, Nolan Grieves
, Steve B. Howell
, Franco Mallia
, Djamel Mekarnia
, Angelica Psaridi

Daniel Sebastian, Keivan G. Stassun, Chris Stockdale, Amalie Stokholm, Olga Suarez, Thiam Guan Tan, Mathilde Timmermans, Cristilyn N. Watkins, Carl Ziegler, Abderahmane Soubkiou, François Bouchy, Marion Cointepas, Vincent Deloupy, Maximilian N. Günther, Michaël Gillon, Giovanni Isopi, Emmanuel Jehin, Jon M. Jenkins, Andrés Jordán, Martin B. Nielsen, Sara Seager, Avi Shporer, Julia V. Seidel, Michal Steiner, Trifon Trifonov, Joseph D. Twicken, Joshua N. Winn, Aldo Zapparata

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Original language	English
Article number	stag864
Journal	Monthly Notices of the Royal Astronomical Society
Volume	549
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stag864
State	Published - Jul 2026

ASJC Scopus Subject Areas

Astronomy and Astrophysics
Space and Planetary Science

Keywords

exoplanets
planets and satellites: detection
planets and satellites: dynamical evolution and stability
planets and satellites: gaseous planets

Access to Document

10.1093/mnras/stag864

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Dransfield, G., Petit, A. C., Triaud, A. H. M. J., Guillot, T., Schmider, F. X., Abe, L., Agabi, A., Barkaoui, K., Baycroft, T. A., Bendjoya, P., Brahm, R., Collins, K. A., Edwards, B., Evans, P., Freckelton, A. V., Grieves, N., Howell, S. B., Mallia, F., Mekarnia, D., ... Zapparata, A. (2026). ASTEP confirmation of a pair of long-period Jupiter-sized planets with extremely low densities transiting TOI-791. Monthly Notices of the Royal Astronomical Society, 549(4), Article stag864. https://doi.org/10.1093/mnras/stag864

Dransfield, G, Petit, AC, Triaud, AHMJ, Guillot, T, Schmider, FX, Abe, L, Agabi, A, Barkaoui, K, Baycroft, TA, Bendjoya, P, Brahm, R, Collins, KA, Edwards, B, Evans, P, Freckelton, AV, Grieves, N, Howell, SB, Mallia, F, Mekarnia, D, Psaridi, A, Sebastian, D, Stassun, KG, Stockdale, C, Stokholm, A, Suarez, O, Tan, TG, Timmermans, M, Watkins, CN, Ziegler, C, Soubkiou, A, Bouchy, F, Cointepas, M, Deloupy, V, Günther, MN, Gillon, M, Isopi, G, Jehin, E, Jenkins, JM, Jordán, A, Nielsen, MB, Seager, S, Shporer, A, Seidel, JV, Steiner, M, Trifonov, T, Twicken, JD, Winn, JN & Zapparata, A 2026, 'ASTEP confirmation of a pair of long-period Jupiter-sized planets with extremely low densities transiting TOI-791', Monthly Notices of the Royal Astronomical Society, vol. 549, no. 4, stag864. https://doi.org/10.1093/mnras/stag864

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title = "ASTEP confirmation of a pair of long-period Jupiter-sized planets with extremely low densities transiting TOI-791",

keywords = "exoplanets, planets and satellites: detection, planets and satellites: dynamical evolution and stability, planets and satellites: gaseous planets",

author = "Georgina Dransfield and Petit, \{Antoine C.\} and Triaud, \{Amaury H.M.J.\} and Tristan Guillot and Schmider, \{Fran{\c c}ois Xavier\} and Lyu Abe and Abdelkrim Agabi and Khalid Barkaoui and Baycroft, \{Thomas A.\} and Philippe Bendjoya and Rafael Brahm and Collins, \{Karen A.\} and Billy Edwards and Phil Evans and Freckelton, \{Alix V.\} and Nolan Grieves and Howell, \{Steve B.\} and Franco Mallia and Djamel Mekarnia and Angelica Psaridi and Daniel Sebastian and Stassun, \{Keivan G.\} and Chris Stockdale and Amalie Stokholm and Olga Suarez and Tan, \{Thiam Guan\} and Mathilde Timmermans and Watkins, \{Cristilyn N.\} and Carl Ziegler and Abderahmane Soubkiou and Fran{\c c}ois Bouchy and Marion Cointepas and Vincent Deloupy and G{\"u}nther, \{Maximilian N.\} and Micha{\"e}l Gillon and Giovanni Isopi and Emmanuel Jehin and Jenkins, \{Jon M.\} and Andr{\'e}s Jord{\'a}n and Nielsen, \{Martin B.\} and Sara Seager and Avi Shporer and Seidel, \{Julia V.\} and Michal Steiner and Trifon Trifonov and Twicken, \{Joseph D.\} and Winn, \{Joshua N.\} and Aldo Zapparata",

note = "Publisher Copyright: {\textcopyright} The Author(s) 2026. Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.",

year = "2026",

month = jul,

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AU - Dransfield, Georgina

AU - Petit, Antoine C.

AU - Triaud, Amaury H.M.J.

AU - Guillot, Tristan

AU - Schmider, François Xavier

AU - Abe, Lyu

AU - Agabi, Abdelkrim

AU - Barkaoui, Khalid

AU - Baycroft, Thomas A.

AU - Bendjoya, Philippe

AU - Brahm, Rafael

AU - Collins, Karen A.

AU - Edwards, Billy

AU - Evans, Phil

AU - Freckelton, Alix V.

AU - Grieves, Nolan

AU - Howell, Steve B.

AU - Mallia, Franco

AU - Mekarnia, Djamel

AU - Psaridi, Angelica

AU - Sebastian, Daniel

AU - Stassun, Keivan G.

AU - Stockdale, Chris

AU - Stokholm, Amalie

AU - Suarez, Olga

AU - Tan, Thiam Guan

AU - Timmermans, Mathilde

AU - Watkins, Cristilyn N.

AU - Ziegler, Carl

AU - Soubkiou, Abderahmane

AU - Bouchy, François

AU - Cointepas, Marion

AU - Deloupy, Vincent

AU - Günther, Maximilian N.

AU - Gillon, Michaël

AU - Isopi, Giovanni

AU - Jehin, Emmanuel

AU - Jenkins, Jon M.

AU - Jordán, Andrés

AU - Nielsen, Martin B.

AU - Seager, Sara

AU - Shporer, Avi

AU - Seidel, Julia V.

AU - Steiner, Michal

AU - Trifonov, Trifon

AU - Twicken, Joseph D.

AU - Winn, Joshua N.

AU - Zapparata, Aldo

N1 - Publisher Copyright: © The Author(s) 2026. Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

PY - 2026/7

Y1 - 2026/7

KW - exoplanets

KW - planets and satellites: detection

KW - planets and satellites: dynamical evolution and stability

KW - planets and satellites: gaseous planets

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VL - 549

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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M1 - stag864

ER -

ASTEP confirmation of a pair of long-period Jupiter-sized planets with extremely low densities transiting TOI-791

ASJC Scopus Subject Areas

Keywords

Access to Document

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