Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b

J. M. Almenara; X. Bonfils; T. Guillot; M. Timmermans; R. F. Díaz; J. Venturini; A. C. Petit; T. Forveille; O. Suárez; D. Mékarnia; A. H.M.J. Triaud; L. Abe; P. Bendjoya; F. Bouchy; J. Bouvier; L. Delrez; G. Dransfield; E. Ducrot; M. Gillon; M. J. Hooton; E. Jehin; A. W. Mann; R. Mardling; F. Murgas; A. Leleu; M. Lendl; D. Queloz; S. Seager; J. Winn; S. Zuñiga Fernández

doi:10.1051/0004-6361/202348492

Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b

J. M. Almenara, X. Bonfils, T. Guillot, M. Timmermans, R. F. Díaz, J. Venturini, A. C. Petit, T. Forveille, O. Suárez, D. Mékarnia, A. H.M.J. Triaud, L. Abe, P. Bendjoya, F. Bouchy, J. Bouvier, L. Delrez, G. Dransfield, E. Ducrot, M. Gillon, M. J. HootonE. Jehin, A. W. Mann, R. Mardling, F. Murgas, A. Leleu, M. Lendl, D. Queloz, S. Seager, J. Winn, S. Zuñiga Fernández

Astrophysical Sciences

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Abstract

TOI-1227 b is an 11 Myr old validated transiting planet in the middle of its contraction phase, with a current radius of 0.85 R_J. It orbits a low-mass pre-main sequence star (0.170 M_☉, 0.56 R_☉) every 27.4 days. The magnetic activity of its young host star induces radial velocity jitter and prevents good measurements of the planetary mass. We gathered additional transit observations of TOI-1227 b with space- and ground-based telescopes, and we detected highly significant transit-timing variations (TTVs). Their amplitude is about 40 min and their dominant timescale is longer than 3.7 yr. Their most probable origin is dynamical interactions with additional planets in the system. We modeled the TTVs with inner and outer perturbers near first and second order resonances; several orbital configurations provide an acceptable fit. More data are needed to determine the actual orbital configuration and eventually measure the planetary masses. These TTVs and an updated transit chromaticity analysis reinforce the evidence that TOI-1227 b is a planet.

Original language	English (US)
Article number	A96
Journal	Astronomy and Astrophysics
Volume	683
DOIs	https://doi.org/10.1051/0004-6361/202348492
State	Published - Mar 1 2024

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

planetary systems
stars: individual: TOI-1227
stars: low-mass
stars: pre-main sequence
techniques: photometric

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10.1051/0004-6361/202348492

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Almenara, J. M., Bonfils, X., Guillot, T., Timmermans, M., Díaz, R. F., Venturini, J., Petit, A. C., Forveille, T., Suárez, O., Mékarnia, D., Triaud, A. H. M. J., Abe, L., Bendjoya, P., Bouchy, F., Bouvier, J., Delrez, L., Dransfield, G., Ducrot, E., Gillon, M., ... Zuñiga Fernández, S. (2024). Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b. Astronomy and Astrophysics, 683, Article A96. https://doi.org/10.1051/0004-6361/202348492

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title = "Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b",

abstract = "TOI-1227 b is an 11 Myr old validated transiting planet in the middle of its contraction phase, with a current radius of 0.85 RJ. It orbits a low-mass pre-main sequence star (0.170 M☉, 0.56 R☉) every 27.4 days. The magnetic activity of its young host star induces radial velocity jitter and prevents good measurements of the planetary mass. We gathered additional transit observations of TOI-1227 b with space- and ground-based telescopes, and we detected highly significant transit-timing variations (TTVs). Their amplitude is about 40 min and their dominant timescale is longer than 3.7 yr. Their most probable origin is dynamical interactions with additional planets in the system. We modeled the TTVs with inner and outer perturbers near first and second order resonances; several orbital configurations provide an acceptable fit. More data are needed to determine the actual orbital configuration and eventually measure the planetary masses. These TTVs and an updated transit chromaticity analysis reinforce the evidence that TOI-1227 b is a planet.",

keywords = "planetary systems, stars: individual: TOI-1227, stars: low-mass, stars: pre-main sequence, techniques: photometric",

author = "Almenara, {J. M.} and X. Bonfils and T. Guillot and M. Timmermans and D{\'i}az, {R. F.} and J. Venturini and Petit, {A. C.} and T. Forveille and O. Su{\'a}rez and D. M{\'e}karnia and Triaud, {A. H.M.J.} and L. Abe and P. Bendjoya and F. Bouchy and J. Bouvier and L. Delrez and G. Dransfield and E. Ducrot and M. Gillon and Hooton, {M. J.} and E. Jehin and Mann, {A. W.} and R. Mardling and F. Murgas and A. Leleu and M. Lendl and D. Queloz and S. Seager and J. Winn and {Zu{\~n}iga Fern{\'a}ndez}, S.",

note = "Publisher Copyright: {\textcopyright} The Authors 2024.",

year = "2024",

month = mar,

day = "1",

doi = "10.1051/0004-6361/202348492",

language = "English (US)",

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Almenara, JM, Bonfils, X, Guillot, T, Timmermans, M, Díaz, RF, Venturini, J, Petit, AC, Forveille, T, Suárez, O, Mékarnia, D, Triaud, AHMJ, Abe, L, Bendjoya, P, Bouchy, F, Bouvier, J, Delrez, L, Dransfield, G, Ducrot, E, Gillon, M, Hooton, MJ, Jehin, E, Mann, AW, Mardling, R, Murgas, F, Leleu, A, Lendl, M, Queloz, D, Seager, S, Winn, J & Zuñiga Fernández, S 2024, 'Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b', Astronomy and Astrophysics, vol. 683, A96. https://doi.org/10.1051/0004-6361/202348492

TY - JOUR

T1 - Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b

AU - Almenara, J. M.

AU - Bonfils, X.

AU - Guillot, T.

AU - Timmermans, M.

AU - Díaz, R. F.

AU - Venturini, J.

AU - Petit, A. C.

AU - Forveille, T.

AU - Suárez, O.

AU - Mékarnia, D.

AU - Triaud, A. H.M.J.

AU - Abe, L.

AU - Bendjoya, P.

AU - Bouchy, F.

AU - Bouvier, J.

AU - Delrez, L.

AU - Dransfield, G.

AU - Ducrot, E.

AU - Gillon, M.

AU - Hooton, M. J.

AU - Jehin, E.

AU - Mann, A. W.

AU - Mardling, R.

AU - Murgas, F.

AU - Leleu, A.

AU - Lendl, M.

AU - Queloz, D.

AU - Seager, S.

AU - Winn, J.

AU - Zuñiga Fernández, S.

PY - 2024/3/1

Y1 - 2024/3/1

N2 - TOI-1227 b is an 11 Myr old validated transiting planet in the middle of its contraction phase, with a current radius of 0.85 RJ. It orbits a low-mass pre-main sequence star (0.170 M☉, 0.56 R☉) every 27.4 days. The magnetic activity of its young host star induces radial velocity jitter and prevents good measurements of the planetary mass. We gathered additional transit observations of TOI-1227 b with space- and ground-based telescopes, and we detected highly significant transit-timing variations (TTVs). Their amplitude is about 40 min and their dominant timescale is longer than 3.7 yr. Their most probable origin is dynamical interactions with additional planets in the system. We modeled the TTVs with inner and outer perturbers near first and second order resonances; several orbital configurations provide an acceptable fit. More data are needed to determine the actual orbital configuration and eventually measure the planetary masses. These TTVs and an updated transit chromaticity analysis reinforce the evidence that TOI-1227 b is a planet.

AB - TOI-1227 b is an 11 Myr old validated transiting planet in the middle of its contraction phase, with a current radius of 0.85 RJ. It orbits a low-mass pre-main sequence star (0.170 M☉, 0.56 R☉) every 27.4 days. The magnetic activity of its young host star induces radial velocity jitter and prevents good measurements of the planetary mass. We gathered additional transit observations of TOI-1227 b with space- and ground-based telescopes, and we detected highly significant transit-timing variations (TTVs). Their amplitude is about 40 min and their dominant timescale is longer than 3.7 yr. Their most probable origin is dynamical interactions with additional planets in the system. We modeled the TTVs with inner and outer perturbers near first and second order resonances; several orbital configurations provide an acceptable fit. More data are needed to determine the actual orbital configuration and eventually measure the planetary masses. These TTVs and an updated transit chromaticity analysis reinforce the evidence that TOI-1227 b is a planet.

KW - planetary systems

KW - stars: individual: TOI-1227

KW - stars: low-mass

KW - stars: pre-main sequence

KW - techniques: photometric

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DO - 10.1051/0004-6361/202348492

M3 - Article

AN - SCOPUS:85187781246

SN - 0004-6361

VL - 683

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A96

ER -

Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b

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